Good afternoon, and welcome to AtriCure's Q3 2022 Earnings Conference Call. My name is Stacy, and I'll be your coordinator for the call today. At this time, all participants are in a listen-only mode. We will be facilitating a question-and-answer session towards the end of today's call. As a reminder, this call is being recorded for replay purposes. I would like to turn the call over to Marissa Bych from the Gilmartin Group for a few introductory comments.
Thank you. By now, you should have received a copy of the earnings press release. If you have not received a copy, please call 513-644-4484 to have one emailed to you. Before we begin today, let me remind you that the company's remarks include forward-looking statements. Forward-looking statements are subject to numerous risks and uncertainties, many of which are beyond AtriCure's control, including risks and uncertainties described from time to time in AtriCure's SEC filings. These statements include, but are not limited to, financial expectations and guidance, expectations regarding the potential market opportunity for AtriCure's franchises and growth initiatives, including the adoption of hybrid AF therapy and future product approvals, clearances, reimbursement, and clinical trial outcomes. AtriCure's results may differ materially from those projected. AtriCure undertakes no obligation to publicly update any forward-looking statement.
Additionally, we refer to non-GAAP financial measures, specifically revenue reported on a constant currency basis, adjusted EBITDA, and adjusted loss per share. A reconciliation of these non-GAAP financial measures with the most directly comparable GAAP measures is included in our press release, which is available on our website. With that, I would like to turn the call over to Mike Carrel, President and Chief Executive Officer. Mike?
Thank you, Marissa. Good afternoon, and thank you for everyone for joining us. We hope that you're well. I am pleased to share another outstanding quarter for AtriCure as we drive adoption across our therapies to improve patient lives and capture the substantial opportunities in front of us. We ended the third quarter with $83.2 million in revenue, reflecting growth of approximately 18% over a strong third quarter of 2021. Highlights for the quarter included continued expansion of our pain management franchise and rising commercial traction from our recently launched EnCompass Clamp, as well as mounting adoption of AtriClip devices globally. Turning to third quarter EPi-Sense product revenue in the U.S., which increased 12% year-over-year and 3% on a sequential basis.
Hybrid AF therapy courses experienced record attendance in this quarter as we trained many cardiac teams on the overall benefits to patients and best practices for setting up a program and working through protocols and logistics. We are seeing growth in both the average number of accounts and procedure volume per account each quarter as we continue to focus on establishing hybrid AF therapy as a standard of care for long-standing persistent atrial fibrillation patients. Additionally, we are seeing increased adoption at top-tier sites, with 14 of the top 25 cardiac programs in the U.S. building programs. To that end, in September, we highlighted the experiences of Dr. Eric Bush and Dr. Zayd Eldadah implementing hybrid AF therapy in their respective practices. Both EPs emphasized the excellent clinical outcomes for their patients, as well as plans to substantially increase adoption.
We believe the commentary from both physicians underscores the efficacy of hybrid AF therapy, an immense opportunity for AtriCure to address this unmet need for millions of patients. Shifting to our pain management franchise, Cryo Nerve Block continues to be our fastest-growing therapy. In the third quarter, we saw sequential revenue increase 3% and are gaining traction within a broad base of accounts, with well over 500 accounts year to date. We believe strong adoption of Cryo Nerve Block therapy is due to physicians seeing immediate results from providing temporary pain relief for patients after thoracic surgery. While we are working to impact more patients in this space, we are also exploring new opportunities, including the application of Cryo Nerve Block for sternotomy. We look forward to sharing our progress on future calls. Now on to our open ablation franchise.
Earlier this year, we announced full-scale commercial launch of the EnCompass Clamp in the United States. The EnCompass Clamp leverages the proven technology of our Synergy ablation system to provide a simpler and faster approach to ablation in open heart procedures. Strong momentum from our initial launch carried into the third quarter, driving nearly 21% growth in the U.S. open ablation revenue year-over-year, reflecting a mix of new adoption and additional revenue per procedure upon conversion to the EnCompass Clamp. We are pleased to share that EnCompass contributed nearly 25% of our U.S. open ablation revenue in the third quarter, and we are continuing to expand accounts and surgeons. Feedback from our customers has been exceptional, and we remain confident in our ability to further penetrate the cardiac surgery market for many years to come.
Finally, our AtriClip product line continues to see consistent growth worldwide, with 18% year-over-year growth this quarter. We are advancing our efforts to innovate the AtriClip platform, focusing on less invasive and easier-to-use devices. We see many opportunities for growth in our appendage management franchise as we increase demand in both our open and minimally invasive businesses. In addition to our existing opportunities, we are actively investigating an expanded application for the AtriClip platform through the LEAPS clinical trial. This landmark trial examines the prophylactic use of AtriClip devices for stroke reduction in cardiac surgery patients without a preoperative AFib diagnosis. Over two-thirds of the nearly 1 million cardiac surgery patients worldwide do not have preoperative AFib diagnosis, yet have an increased risk in their lifetime. We believe this trial will demonstrate the benefit of excluding the LAA with the AtriClip, providing a substantial extension of our markets.
Trial initiation is underway, with patient enrollment expected in the coming months. While the trial will take a number of years to complete, we anticipate awareness for appendage management in all cardiac surgery procedures to increase in the interim. In addition to our efforts at market expansion through LEAPS clinical trial, we are cultivating new markets by building upon existing technology and leveraging the unique physician relationships we have developed. Earlier this year, we announced the first patient was treated in the HEAL-IST clinical trial. HEAL-IST will study the treatment of patients with inappropriate sinus tachycardia, or IST, using hybrid ablation procedures. IST is characterized by an elevated heart rate and distressing symptoms of heart palpitations contributing to the inability to sleep or exercise. It affects millions of people around the world, and currently there are no approved treatments for this debilitating condition.
We continue to make progress with the trial and remain excited for the potential of this new therapy to unlock another significant market opportunity and provide a solution to the many patients with IST. In addition, we are advancing product development efforts on a dedicated device for this therapy, and we'll share more as we continue our efforts to build the market. Across our business, we are seeing growing interest in our differentiated solutions and are proud to work with all 50 of the U.S. News & World Report's best hospitals for cardiology and heart surgery. The investments we have made in innovation, clinical science, and education position AtriCure for accelerated and durable growth for years to come. I'll now turn the call over to Angie Wirick, our Chief Financial Officer, to discuss more detail about the quarter.
Thank you, Mike. Our third quarter 2022 worldwide revenue of $83.2 million increased 18.1% on a reported basis and 19.8% on a constant currency basis when compared to the third quarter of 2021. Revenue was driven by solid growth across key product lines and geographies, bolstered by outstanding results in pain management, appendage management, and open ablation. On a sequential basis, we experienced a 1.5% decline in revenue from the second quarter, attributed to normal seasonal variation and underlying procedures. In the third quarter 2022, U.S. revenue was $69.8 million, a 21.3% increase from the third quarter of 2021.
Open ablation product sales, which exclude pain management, were $21.6 million compared to $17.9 million, up 20.5% over 2021, showing building strength from the EnCompass launch with a combination of new adoption and incremental revenue per procedure. We estimate open concomitant procedure growth was roughly half of the growth for the quarter, consistent with our expectations of sustained and steady penetration of the cardiac surgery market. Minimally invasive ablation sales were $10.1 million, up 0.9% from 2021. As Mike noted earlier, within U.S. minimally invasive ablation sales, EPi-Sense revenues increased approximately 12% year-over-year and 3% on a sequential quarter basis. However, EPi-Sense revenue growth was offset by approximately 21% decline in the legacy MIS ablation revenue year-over-year.
We exited the third quarter with 75% of U.S. MIS revenues attributed to the EPi-Sense system and continue to believe in the significant long-term growth potential for hybrid AF therapy. Rounding out U.S. revenue, pain management sales were $10.5 million compared to $6.3 million, up 68.1% over the third quarter of 2021. Sales of appendage management products in the U.S. were $27.6 million, up 18% over the third quarter of 2021. International revenue was $13.4 million, up 4.2% on a reported basis and 13.5% on a constant currency basis as compared to the third quarter of 2021.
European sales accounted for $7.3 million, driven by increased activity in the United Kingdom and broader markets, offset by unfavorable exchange rates as well as slowed activity in the Netherlands and Germany. Asia and other international markets accounted for $6.1 million in international sales on strength in most markets, notably Australia and Japan, partially offset by prior year activity in China. Overall, international markets were fueled by growing adoption of AtriClip devices, resulting in an increase in appendage management revenue of 19.5% from the third quarter of 2021. Now turning to another key metric for the third quarter of 2022. Gross margin was 74.1%, flat to the third quarter of 2021.
While we are seeing benefits from an increasing scale of our operations, more recently they have been offset by rising costs and supply chain pressure as well as a shift to lower gross margin products. Moving to detail on operating expenses for the quarter. As a reminder, operating expenses for the third quarter of 2021 included a $189.9 million credit to operating expenses for the change in fair value of contingent consideration, offset partially by an $82.3 million intangible asset impairment charge for the IPR&D asset associated with the AMAZE trial. Excluding these items, operating expenses increased $11.3 million or 18.4% from $61.2 million in the third quarter of 2021 to $72.4 million in the third quarter of 2022.
The increase was primarily driven by research and development activities, which grew approximately 34% year-over-year, while selling general and administrative expenses increased 15%. Our adjusted EBITDA was -$735 thousand compared to a positive adjusted EBITDA of $691 thousand for the third quarter of 2021. Our basic and diluted net loss per share was $0.27 in the third quarter of 2022 compared to a basic and diluted net income per share of $2.15 and $2.11 in the third quarter of 2021. The adjusted loss per share in the third quarter 2022 and 2021 was $0.27 and $0.23, respectively. Our balance sheet is very strong, and we ended the third quarter with $174 million in cash and investments.
The modest cash burn shown this quarter largely reflects capital expenditures associated with the expansion of our manufacturing operations, as well as an increase in inventories. Turning to our outlook for 2022. Given the ongoing momentum across our business, we now expect to achieve approximately $328 million-$333 million in annual revenue, reflecting full year growth of approximately 20%-21%. As we think about fourth quarter expectations by geography and franchise, we believe the EnCompass launch will continue to positively impact U.S. open ablation revenue. Within U.S. MIS ablation, throughout this year, we have seen more pronounced impact to procedures in our legacy MIS business as we operate within a much smaller base of customers.
Therefore, while fourth quarter of 2021 included $3.7 million of a contribution from legacy MIS devices, we are trending at approximately $2.5 million currently. Finally, like many other companies, we face increasing headwinds from unfavorable exchange rates in the third quarter and expect this pressure again in the fourth quarter. We continue to expect 2022 gross margin to be comparable to the full year 2021, with the potential for varying impacts from increasing costs to mix, largely on the strength of our pain management franchise and the EnCompass launch. We are maintaining our level of investment in research and development activities with spending in product development and clinical science initiatives across our platforms. Additionally, our plans anticipate the thoughtful investments in our commercial team along with market development activities and training and awareness programs.
We expect the full year 2022 adjusted EBITDA to be a loss of approximately $4 million, corresponding to an adjusted loss per share for 2022 of approximately $1.10-$1.12. Therefore, fourth quarter results are expected to be approximately $4 million in positive adjusted EBITDA. As we navigate the remainder of this year, our employees across the globe remain focused on our patient-first mission. Whether that means clinical trial or product development activities, market awareness and education, administrative support, or the production and fulfillment of our products, the AtriCure team has shown immense collaboration and dedication despite a tough backdrop from various uncertainties in the world and economy. Thank you all for making our company truly a special place and breathing life into our mission and values each day.
Now I will turn the call back to Mike for closing comments.
Thank you, Angie. In addition to being proud of our team for a great financial quarter in which we grew the business and advanced many long-term growth catalysts, I am truly in awe of the wide-ranging talent of our employees. I'd like to highlight a program developed by our team, the Women's Cardiac Health Awareness Initiative. In early October, AtriCure sponsored an all-star physician panel discussing the unique needs of women in prevention, screening, and treatment of atrial fibrillation. This live online event brought together leaders in the fields of cardiac surgery, electrophysiology, and thoracic surgery to educate peers about the importance of improving the heart health of women. The program was a tremendous success and a huge step in our effort to encourage a heart team approach to address gaps in healthcare.
Additionally, I am honored to share that AtriCure has been selected as one of only 20 finalists in the nation for the 2022 Diversity, Equity and Inclusion Awards by the National Association of Corporate Directors, or NACD. This prestigious recognition is a testament of our intentional action around DE&I, beginning with the composition of our board of directors and continuing with training, practices, and objectives that have a measurable impact across our employee base. The commitment to fostering a workplace that rejects discrimination, celebrates differences, and promotes equality is fundamental to our organization and how we operate. At AtriCure, our future is bright, and we're thankful for support for all of you on this call today. With that, I'll turn it over to the operator.
As a reminder, to ask a question, you will need to press star one one on your telephone. Please limit questions to one question and one follow-up at a time, and then return to the queue for additional questions. Please stand by while we compile the Q&A roster. Our first question comes from Robert Marcus of JP Morgan. Robert, go ahead with your question.
Great. Thanks for taking the questions, and congrats on a good quarter. Maybe to start off, you know, the focus is on the MIS business, and I appreciate that it looks like Converge did grow in the quarter. It was the legacy business that there was something like a $2 million headwind or so. You know, it was really helpful to have that online event last month. How do we think about when we might start to see some more tangible improvements in sequential growth there? You know, now with one month under your belt, do you think it might be fourth quarter, or do you think we're gonna have to wait till 2023 to start to see a tick-up?
It's a great question, a fair question, and obviously one that we've had on this call and one that we're expecting, Robbie, so I appreciate you bringing it up right away. From our perspective, you know, as we look at very specifically the EPi-Sense part of our business and kind of what we see as the growth, we're making good traction. As I mentioned, we're in 14 sites now, out of the top 25 programs in the country. Many of those sites are just beginning their program. So I don't think you're gonna see tremendous impact in the fourth quarter, but I do think that as we look at next year and the year after, you're starting to see really some traction, the increase in the number of accounts and the, and more depth within those accounts as well.
the hockey stick, I can't give a specific time necessarily on when that's gonna hit, but we feel really good that the momentum is beginning to build in these programs and beginning to expand. When you think about what we tried to do at that show, when we looked at Dr. Bush and Dr. Eldadah, the goal of that was to show you really two outstanding programs that were at different places. Dr. Eldadah was one who they've been around for a long time, and what the data did for them is it allowed them to expand and look outside of just Dr. Eldadah doing the referrals to the other 12-14 EPs he has in his practice and the other hospitals that they contract with. that really kind of began to explode that.
Actually today, they just announced they did their 350th case today. They're really beginning to see that momentum build within that program as well and wanted to show that once a program's established, it even has more expansion opportunities within it. Dr. Bush was a little different because he was really about that early stage, which is they just got going right when the data came out. They really got going when we got the label, and that enabled them to kinda move on. Now the label's only a year and a half ago. They're now up to almost 35, 40 cases or so this year.
We anticipate that those that we're starting now will begin to really kinda contribute in a bigger way probably the end of next year and into the year after, but even a little bit at the beginning of next year. You can see these programs are beginning to build. This is gonna be strong, durable revenue for a long time in these accounts, and we've got lots of people coming, to the training programs that we have. It's not about kind of if, it's really about when for us in terms of the timing of this because I think the data is there, and it's compelling, and the market is really, really big.
Great. You know, maybe as we look to 2023, you know, I think it's important the fourth quarter's gonna be the first in a while, if not the first ever, I didn't look all the way back, just EBITDA profitable quarter. You know, is this a trend you think you should be carrying forward into 2023 and it's profitability from here on out, or might the first half of the year turn back negative before turning profitable again? Thanks.
Yeah. It's a good question, Robbie. What we typically see in the first two quarters of the year is typically a higher loss, and the balance for the full year typically comes down. That's if you were to look back at AtriCure's P&L for many, many years. Where we're sitting at today, it's a $8 million loss year to date. We are expecting +$4 million for the fourth quarter, bringing the full year to the guide of about a $4 million loss. I think as we enter next year, without giving a specific date of achieving full year profitability, I think pretty naturally this happens in the near term.
You know, historically, we've been able to make good improvements to the bottom line, you know, on lower growth rates in the history of AtriCure and would expect despite, you know, a lot of the great investments that we're making in the big opportunities that are in front of us, that we would turn to, you know, profitability in the near term. It's definitely a focus of us and our team, and I think, you know, without having to sacrifice, you know, a lot of the great initiatives, particularly when you think about our R&D spending.
Great. Thanks for taking the questions.
Thank you.
Please stand by for our next question. Our next question comes from Rick Wise with Stifel. Rick, go ahead with your question.
Thanks. Hi, Mike. Hi, Angie. Maybe start with gross margin. You called out that, I mean, obviously it was flat year over year, and a little surprising given the higher sales volume. Maybe you could expand on the inflationary supply chain cost pressures. I mean, is it getting worse? You know, just what's happening? Where are we in AtriCure feeling those pressures? I was a little surprised at the language about shift to product mix and lower margin products. I wasn't sure I understood that fully. Just help us think about just at a high level, can gross margins, should we expect gross margins to improve in 2023? Thank you.
Yeah. Sure. Sure, Rick. With regards to the cost of some of the supply pressures, I'd say this was the first quarter where we started to see maybe a bit of an increase in some of the costs. It may be the timeline of different contracts that we're working under. But the other pressure that we saw was maybe not the optimized production volumes we would've liked to have seen during the quarter. Maybe some limitation there. That being said, exceptionally proud of the team, given the backdrop that we're operating in, that we haven't had any backstop in being able to fulfill orders. With regard to the second part of the commentary, the shift in product mix really is focused on two products.
The cryoSPHERE device is a lower gross margin product, and as that becomes a bigger component of our overall revenue, it is having an impact on the gross margin. Great growth rate, it's a phenomenal therapy, but it does come at a slightly lower gross margin than you see out of our other RF and cryo products. The other big driver this quarter in particular was we had a nice uptick in the EnCompass Clamp revenue, and that is another one. This is just first year out of development and first year into production, and it'll take some time for us to learn the cost, but the team has identified some great areas that they're focusing on for 2023. That being said, I feel comfortable in the balance.
You know, I think our guide in general is, you know, for the balance of the year to be around what we did in the full year 2021, which was right about 75%. You know, the big impacts here really being product shift and mix, and then geography mixes as well.
Thanks. Just one on Cryo Nerve Block. I mean, it continues to grow sequentially. You know, very impressive, the 500 accounts. We've done some checks recently with thoracic surgeons who are using it, and their reactions have been incredibly positive. Talk about the physician reaction. You touched on it a little bit, Mike. Maybe help us understand, you know, what's next for the technology, how your thoughts are evolving about the opportunity, and can this growth, you know, continue? Thank you.
Great question. You're right. I think the instant response you get from physicians, and not just physicians, but also people that care for the patients after they go out of surgery on the ICU floor, the nurses, the PAs, and others, is instant gratification because they see the patients recovering more quickly. They can breathe more easily, and they can kind of get up and walk around. That's really, really important towards their recovery, especially in many of these different thoracic cases. I think that's a common theme that we hear from people all the time, which is just the dramatic and immediate impact that they sense. As it relates to the overall market, the overall market in the U.S. is about 140-150 thousand thoracic procedures every year. That number is growing.
We'll do about 16,000-18,000 or so of those cases this year. As you can tell, we're just over 10% or so penetrated into the space. We think that number can obviously grow quite dramatically because of the impact that we can have. One is, yes, we've got a lot of room for growth just within the thoracic part of our business, both going deeper into the accounts. One in 500 accounts, there are more accounts that we can get into, but a lot of this is getting even deeper within the accounts that we have today as well, and them kind of sharing it across more thoracic surgeons that might be in an area.
Number two is, I kind of briefly mentioned it, that as we think about how do we expand it, we're already thinking about new markets for the technology, in particular sternotomy. We anticipate that sometime probably mid to late next year, we'll be able to kind of maybe roll something out a little bit more aggressively into that area. That probably won't have much impact on 2023 revenue, but we do anticipate that that'll expand the market quite dramatically 2024 and beyond. Think about sternotomies. It's about 250,000 or so of them in the U.S. alone, 600,000+ on a global basis. When you start to do the math on the benefits that could be there, it's a very large market opportunity for us.
We're just in the beginning stages of kind of learning a little bit more about it, and hopefully middle part of next year, we'll be able to roll something out more officially.
Thank you so much. Good health.
Thank you. Stand by for our next question. Our next question will come from Marie Thibault from BTIG. Marie, go ahead with your question.
Hi. Thank you for taking the questions. Hi, Mike, Angie. Wanted to ask a question here first on Converge and maybe you can give us some more detailed thoughts on how you're thinking about the ramp going forward. It certainly sounds like you're feeling optimistic about the momentum you're seeing. But as we look into 2023, are there ways to sort of characterize the ramp in terms of the cadence you'd expect into the next year? As a second part of that same question, on the legacy MIS declines, is that $2.5 million? Is that a number we should think about going forward, or do you expect that to eventually rebound? Thank you.
Yeah. I'll start with the first one. The legacy MIS business, the $2.5 is kind of where we anticipated being for the time being. That's kind of where we are. It's obviously at a much lower number than it had been historically. I'd say that just a little bit more color into that. That was the part that when it got hit the most by COVID, and those programs were just more difficult to get back up and running and going and get consistent again, find the staffing. They're in the hospital for a longer period of time. While we had some really good sites, it was in a much smaller base of customers. That impact had a broader impact on that base.
It's kind of been consistent, and we think in that kind of $2.5 million range or so. As it relates to the kind of cadence for next year, we do see next year obviously being better than this year. We anticipate that we're gonna see momentum build into the next year, and throughout as we're adding more of these accounts. I'm not ready to give like real specific cadence throughout next year yet just 'cause I think we wanna learn more as we're getting more consistency coming out of COVID and getting these sites to have more consistent streams of patients that are coming in before I'm ready to kind of give a specific cadence kind of by quarter or anything like that, for next year.
I don't think we're ready to kinda give that kind of cadence, but we do anticipate growth to really pick up next year quite a bit, and feel confident that that's gonna happen.
Okay, I appreciate that, Mike. My follow-up here on the strength you had in the open ablation market, this quarter. Certainly, we've heard positive commentary on cardiac surgeries this quarter so far from some of your peers. Do you expect some of that to be sustainable? Are we working through a backlog? How do you sort of see the open ablation franchise moving forward here over the very near term? Thank you.
Yeah, I think from an open ablation standpoint, I think from a cardiac surgery standpoint, maybe I'll start with that because that's where you started the question. We definitely see that is a very durable base of business. I mean, it's not growing super fast in terms of at the case level, but you're definitely starting to see that come back to a more normalized place before COVID, and we feel very good about the overall kind of cardiac surgery market in general. I think many, many years ago, people were a little bit worried about it, and now I think there's a lot of confidence that that's a robust area, especially with kind of the baby boomers getting older, people living longer, that cardiac surgery is a very good outlet, and they get great results.
As a result, I think that's gonna, you know, be kind of, it'll be a solid base. The good news for us, and the message we've always said is that it's about penetration. It's about saying, even today, we're still only in about 27% of all the cases that are patients that have atrial fibrillation. That's up from 10% maybe 12 years ago, but 27% is not 75%. All the guidelines are there, and we've now eliminated things to enable it to kind of grow and to continue to grow and get that penetration up. Number one is that we just added a new technology to make it simpler and easier for someone to ablate the heart without having to open up the heart. EnCompass does that.
That was one of the big pushbacks that basically was in kind of limiting that piece of the business. Really, we believe we can grow that penetration from 27%, and that's really what we're focused on. How do we get after those surgeons that are non-treaters today, they're not doing the ablations today? Number two is that the recent reimbursement changes that happened in October of 2021, where they added significantly to this, it doesn't have an immediate impact, but it definitely has an impact that over time, they start realizing that, wait a second, this actually is profitable for us in addition to being really good for the patients. You kind of have the combination of that happening. Again, that doesn't have an overnight impact.
You really, number one, have to focus on the patient and what's right there, but then it's always nice when you've got the additional reimbursement. It's been recognized by CMS that treating these patients makes sense for the patient and for the system overall. I think those two things, over the course of the next many years to come, are gonna enable us to grow that penetration from 27% and, I mean, much, much north of that.
Very good. Thank you.
Stand by for our next question. Our next question comes from William Plovanic from Canaccord Genuity. William, go ahead with your question.
Hi, Mike and Angie. It's John on for Bill tonight. Thanks for taking our questions. Could you start with just talking about the quarter-over-quarter trends in the U.S. appendage management business? Was the AtriClip mix, product mix different this quarter?
No, John. Mix was relatively similar quarter to quarter.
Okay, thanks. Back to cryoSPHERE. I mean, you've seen really great growth in the pain management business. Can you talk about your thoughts on label expansion and possible clinical work to show either if opioid reduction label or, maybe improvements in length stay? Thanks.
Yeah, it's a great question. One we have a lot of conversation about internally all the time, John, around what can we do to expand or get more data out there. We have invested in many different trials already. A lot of single center and maybe small multi-center trials to try to show different length of stay impact. You're not gonna see as much length of stay in some of the robotic thoracic cases just because they're only in the hospital for a couple of days. Really what you have to have there is they've got to see the benefit of actually seeing significant reduction in pain in that patient for not just their time in the hospital but over the longer time.
We're looking at different economic studies to show that, how do you actually benefit the system overall within that 4-6-month or 4-6-week period, for that patient population. Those are the kinds of studies that we're looking to study. It's not necessarily a label expansion, it's really looking at the economic analysis for being able to justify spending the money because they see the impact right away on a patient. It's about can we get some economic analysis that's beyond just that length of stay component. As it relates to the opioid side of it, I think it is one that we're looking at.
The big thing we're looking at right now is how do you get a consistent piece there, which is not every site uses opioids in the same way, and there's really no standard of care for these patients. We've run a lot of different advisory boards to try to figure out how do we hone in on the exact right one that's gonna be applicable after we do the study. I'd say that sometime probably next year or late next year, hopefully we'll have a study in mind. It doesn't necessarily have to be a label expansion study. It could just be studies that are done on a multi-center basis, and that's kind of the work we're doing right now to look at that.
Thank you.
Please stand by for our next question. Our next question comes from Matthew O'Brien with Piper Sandler. Matthew, please go ahead with your question.
Great. Thanks for taking the question. Mike, can we talk a little bit more about Converge in the quarter? You know, I'm pretty sure Q3 tends to be a seasonally slower quarter, but I think you said that you were actually up 3.5% sequentially. First of all, is that right? Where did that growth come from? I know it's existing centers, but what did you see as far as adoption? And then, you know, again, kind of to Marie's question about next year, you know, it feels like you're trying to guide us to be a little bit more conservative with our view on Converge for early next year, maybe building more so towards the end of next year and then maybe more of an inflection in 2024. Am I characterizing that right?
Yeah, Matt, I'll take the first part. We did see sequential growth in EPi-Sense of 3% quarter-over-quarter, and most of that was just driven by a higher number of accounts that were ordering. We hit kind of a high water mark in terms of number of accounts ordering in the quarter in Q3 of this year. That was a mix. It was, you know, new accounts as well as, you know, going deeper within existing accounts.
As it relates to the cadence of kind of the trend, again, I think you're kind of characterizing it reasonably accurately around kind of what we're thinking about, but we don't wanna get too far ahead of ourselves after one quarter. You know, we've had a couple quarters in a row here where we've seen some nice sequential growth. We do feel like this is going to be a long-term durable strategy for us or our business, but we don't wanna get ahead and kind of give numbers specifically yet for the earlier part of next year.
Got it. As the follow-up, I appreciate that feedback. On the PFA side, I hear a lot like, oh, PFA, you know, is gonna take over the whole industry, and, you know, that's why conversions never gonna take off. There was a safety notice, you know, recently about PFA and, hey, people are using it off label, stay in your lane. I'm just curious, I know it's early, if that warning letter or, sorry, notification will really keep people, you know, to using PFA for paroxysmal versus long-standing persistent and really keep people a little bit more driven to use the conversion approach in the future for long-standing persistent. Just real quick, on the IST side, is that a difficult to identify patient population?
Like, could that be challenging as far as you're, you know, trying to get that indication out there and rolling going forward? I know, again, it's super early. Thanks.
Yeah. First on the PFA side, our thoughts really haven't changed much. I think it's a potentially complementary product to us. I think there's a lot to learn. I think what you're seeing in some of the data that's coming out from some of the early studies is demonstrating that there's a lot for us to learn, but it's still an exciting technology and has a lot of promise. Most of the studies are being done in paroxysmal patients at this time, and I think that, you know, I think we'll kind of wait for that. I think what we do is we actually add a lot of value. If you watched the Dr.
Eldadah, he actually, I thought, explained it very well on our call where he was talking about the fact that the epicardial portion, combined with any kind of endocardial portion, whether PFA, RF or cryo, is gonna benefit the patient from that standpoint. You really wanna have it sandwiched and get a purely truly durable transmural lesion. We believe whether it's PFA, RF or cryo, that there's gonna be a benefit to the epicardial approach enhancing that durability long term. There's a lot to learn about what's gonna happen with PFA. When I have the conversations with a lot of EPs, I think that, you know, we're going to. You know, once we get through kind of the super excitement up front, we really get kind of the brass tacks of thinking through how they're gonna go implement this.
I think Converge has a really big role to play even in PFA accounts, if and when that does take off at some point in time. From an IST standpoint, there are a lot of patients that have IST. I think you're right that a lot of work has to be done to begin to kind of develop the care pathway for those patients, finding them that referral basis is gonna happen. We saw a lot of activity in Belgium, where they actually got a lot of patients once they announced they had a solution for it. I think once we have a solution, and then this is primed for kind of a direct to consumer type of activity at some point because it's the patients that are gonna be out there, they're gonna come and wanna get treated.
They're gonna wanna find treatment because there is no treatment today. That's many years off. We've obviously got to get the label first, so there's a ways to go on that. I would anticipate that's probably how they're gonna reach a lot of this patient population.
Got it. Thank you.
Standby for our next question. Our next question is coming from Mike Matson of Needham & Company. Mike, go ahead with your question.
Thanks. You know, just one on cryoSPHERE. To expand into the sternotomy opportunity, you know, what do you have to do from a product and regulatory standpoint? Do you have to redesign the product? Do you have to get another 510(k), etc.?
Yeah, it's a really good question, Mike. Right now we've got to go through some internal testing just to make sure that we kind of understand how it works on the sternum. We do have cases that are actually happening there today. So from that standpoint, the biggest thing we've got to do is just make sure that they can apply it safely. But the product itself doesn't have to change. The product actually works very well. I'm guessing many of them are gonna want maybe a little shorter shaft or maybe a little bend in it, so they can kind of get a little bit different access to it as opposed to the retractor.
Otherwise, the actual way we deliver the cryo energy to the ball at the end, how that comes, delivering the exact right amount, it's the same intercostal nerve that you're ablating when you're doing a thoracotomy. It's very consistent from that standpoint. From that standpoint, we don't think we need to make much on the regulatory or the product standpoint side.
Okay, thanks. Then you gave us your latest penetration numbers for open heart ablation. I was wondering if you could do the same with AtriClip. I mean, continuing to see really strong growth here, but just wondering what you think the penetration is U.S. and worldwide for AtriClip. That's assuming you don't obviously have the stroke indication that you're running the LEAPS trial for.
Yeah. We believe that we're probably closer into the mid-40s% or so on the overall AtriClip on open cardiac cases today. There's still a lot of room for growth, even in open cardiac cases. Obviously, we're expanding the market with the LEAPS trial and feel very confident in moving forward on that. From our standpoint, we feel like we're in a good position to not only just expand penetration, but also into a new market.
Okay, thanks. Then it sounds like you've got some new versions of AtriClip coming, and, you know, I think part of the growth story there has been that you've gotten some nice price premiums when you've launched them in the past. Do you think you can continue to do that with new versions? You know, in other words, price them at a premium?
I think TBD on the pricing side of things, but the biggest thing right now is that we're always innovating to make the product easier to use for them to be able to put on all anatomies, to make it simple, leaving less behind. Those are the kinds of things that we're looking for. It's making it smaller, making it more mobile, and really continuing to innovate to show people we're making major investments in the platform long-term that they can apply it on every one of their cases.
Okay, got it. Thank you.
Stand by for our next question. Our next question comes from Suraj Kalia of Oppenheimer. Go ahead with your question.
Just the Zio monitor versus
Go ahead, Suraj, with your question.
Trying to understand how.
Suraj with Oppenheimer.
Some of these assumptions, and at the same time, maybe Doug or someone else, if I could just throw it in.
Suraj, if you're speaking on this call, it's a little tough to hear you.
Thanks for taking my question.
Suraj? I guess, Suraj, it was really difficult to hear the question. Suraj, you wanna come back in and we can-
Mike, can you hear me?
Oh, now we can. Thank you. Good. Okay. Yeah, we lost you there.
Sorry about that, Mike.
It's okay.
Hey, so, Mike, I know people have asked a lot about Converge. Mike, when you look at the pie chart for the quarter, right? Just the growth pie chart. If I could split it, here is the growth X% from Converge versus cryoSPHERE versus AtriClip versus others. You know, just give us a relative framework of how we should think about the different components of growth. The reason I ask is, you know, we are seeing the embedded numbers in Converge, right? But it seems most of the growth seems to be coming from cryoSPHERE and AtriClip. Maybe you could parse it to the next layer would be great.
Yeah. Suraj, when you break down the U.S. business, I think the numbers go like this. The pain management business, the cryoSPHERE probe grew a little over 68% year-over-year. That was followed then by our open ablation business, which again, my commentary included that about half of that, half of the 20% growth or so for the quarter is really procedure growth. The other half is from an uptick in pricing that we're seeing on the EnCompass Clamp. That was followed by the appendage management business, which reported about 18% growth in the U.S. year-over-year. EPi-Sense tool was 12% and then offset by a decline in the legacy MIS tools year-over-year.
Fair enough. Angie, did you talk about new store, same-store sales specifically for Converge? Thank you for taking my questions.
Yeah. The prepared comments included that this was one of our record quarters from a number of centers that were ordering. We've cautioned investors to take a look at the kind of number of centers that are ordering. Some centers may be ordering, but it's that one or two buy during the quarter, which is why we've been hesitant to give kind of the total population until we get accounts that are really going and fully have adopted, you know, driving significant volume. I'd say, you know, number of centers to us is an encouraging sign of an adoption, but maybe not the best sign relative to overall revenue.
Thank you.
With that, I'm showing no further questions at this time. I would now like to turn the conference back to Michael Carrel for closing remarks.
Great. Again, everyone, thank you for joining us tonight. As you can probably tell from our tone and tenor on the call tonight, we are really excited about our future, about the diverse platform we have across all of the parts of our business, and momentum in each and every area that we've got there. Thanks again for supporting us, and we look forward to hearing or talking to you early next year. Have a great one. Talking to you.
This concludes today's conference call. Thank you for participating. You may now disconnect.