The study, published in Clinical Research in Cardiology, analyzed 2,002 patients who underwent transfemoral TAVI between April 2011 and January 2023. All patients had high-quality computed tomography angiography scans of their peripheral vessels, allowing the investigators to reconstruct the three-dimensional path of the iliac and femoral arteries with dedicated software. The median age of the cohort was 81 years, 45.2 percent were women, and the median EuroScore II, a measure of surgical risk, was 4.22, reflecting the typically frail population that receives these valves.

The tortuosity index itself is elegantly simple. Using centerline reconstruction of the CT scan, the team measured the true length of the vessel path from the aorto-iliac bifurcation down to the epigastric artery, then divided that by the straight-line distance between the same two points. A perfectly straight vessel would score 1.0. Borrowing from guidelines developed for endovascular aortic aneurysm repair, the researchers classified vessels into four grades and dichotomized patients into a low tortuosity group with an index at or below 1.5 and a high tortuosity group above 1.5.

The results were striking. At six months of follow-up, 7.9 percent of patients in the high tortuosity group had died, compared with 5.2 percent of those in the low tortuosity group, a difference that reached statistical significance. After adjusting for peripheral artery disease, creatinine clearance, and prior myocardial infarction using Cox proportional hazard modeling, a tortuosity index above 1.5 remained independently associated with mortality, carrying a hazard ratio of 1.679. When the index was treated as a continuous variable, each unit increase was associated with an even larger hazard ratio of 3.593.

Perhaps the most intriguing aspect of the finding is that the high tortuosity group was not simply sicker in the conventional sense. Although these patients were older, they actually had a lower prevalence of established mortality-related comorbidities, including diabetes, arterial hypertension, coronary artery disease, and malignancy. This suggests that the excess mortality cannot be explained by a heavier burden of traditional risk factors, and that the winding shape of the arteries may itself carry prognostic information.

The authors propose that vascular tortuosity may act as a marker of frailty and biological aging. Arteries elongate and kink as elastic fibers degrade over decades, and previous work has linked tortuosity in non-atherosclerotic vascular disease to age, aneurysms, and hypertension. In this framing, a highly tortuous iliac artery is less a direct cause of death than a visible fingerprint of a vascular system, and a patient, that has aged faster than the calendar suggests. The researchers caution that they could not calculate formal frailty indices in this retrospective cohort, so this hypothesis remains to be confirmed in prospective studies.

Notably, the tortuosity index did not predict periprocedural vascular complications in this cohort. Major vascular complications occurred in 16 percent of all patients and minor complications in 18.6 percent, with no significant difference between the low and high tortuosity groups. Puncture-related bleeding was the most frequent cause of access-site problems, followed by dissection or stenosis and pseudoaneurysm. The authors attribute this apparent disconnect to the dramatic technological evolution of TAVI over the study period, including lower-profile delivery systems, flexible introducer sheaths, ultrasound-guided puncture, and improved closure techniques, which have driven vascular complication rates down from roughly 15 percent in the earliest era to as low as 0.7 to 1.5 percent in contemporary practice.

The temporal dimension of the data adds nuance. Within the registry, 26 percent of major vascular complications occurred in patients treated before 2018, versus only 9.6 percent after that year. The statistical interaction between the tortuosity-mortality association and the year of treatment was significant, yet the index remained predictive of death even after adjustment for treatment year and period. This suggests that while better devices and growing operator experience have blunted the mechanical hazards of navigating twisted vessels, the prognostic signal embedded in arterial geometry persists, hinting at a biology that technology cannot yet override.

For clinicians, the practical message is that the tortuosity index, already validated for planning large-bore access in endovascular aneurysm repair, can be applied to TAVI patients using the same CT scans they already receive. A value above 1.5 may flag a higher-risk population deserving extra scrutiny during preprocedural planning, from ultrasound-guided access and high-support guidewires to straightening maneuvers and careful choice of access side. The study has limitations, including its single-center retrospective design, six-month follow-up, and the exclusion of roughly 40 percent of screened patients who lacked suitable CT imaging. Still, the idea that a number as mundane as a length ratio, calculated in seconds from an existing scan, could whisper something profound about a patient’s resilience is a compelling reminder that in medicine, sometimes the shape of things says as much as their substance.

Subject of Research: Association between peripheral vessel tortuosity index and six-month mortality after transfemoral transcatheter aortic valve implantation

Article Title: Peripheral vessel tortuosity index and prognosis in patients undergoing transcatheter aortic valve implantation

Article References: Alvarez-Covarrubias, H. A., Jurisic, M., Seguchi, M., Salzmann, C., Hug, K., Hübner, J., Starnecker, F., Syryca, F., Haug, F., Pellegrini, C., Rheude, T., Mayr, N. P., Cassese, S., Kastrati, A., Xhepa, E., & Joner, M. (2026). Peripheral vessel tortuosity index and prognosis in patients undergoing transcatheter aortic valve implantation. Clinical Research in Cardiology. https://doi.org/10.1007/s00392-026-03035-w

Image Credits: AI Generated

DOI: 10.1007/s00392-026-03035-w

Keywords: transcatheter aortic valve implantation, TAVI, tortuosity index, peripheral artery disease, computed tomography angiography, vascular complications, mortality, frailty, transfemoral access, iliac artery, aortic stenosis, cardiology

The problem the technique addresses is one of the most stubborn in microsurgery. When surgeons rebuild faces, jaws, and throats after cancer removal, they routinely transfer living tissue from elsewhere in the body and hook it into blood vessels in the neck. Those recipient vessels are often poor-quality real estate. Tumor extension triggers inflammation, radiation therapy damages vessel walls, and repeat operations leave behind dense scar tissue. As prior research cited by the team has shown, previous surgery and radiation frequently produce scarring that makes identifying usable vessels exceedingly difficult in what specialists call the vessel-depleted neck.

Why does this matter at the microscopic level? The innermost layer of a blood vessel, the intima, is lined by endothelial cells that normally resist clot formation. When that layer is injured, particularly by vertical defects, the risk of thrombotic occlusion rises sharply. Earlier histological work has documented endothelial damage, intimal hyperplasia, and medial necrosis at failed anastomotic sites, underscoring that preserving intimal integrity is the difference between a thriving flap and a dead one. In a conventional hand-sewn connection, the intimal surface between suture knots can be exposed to high-velocity blood flow, raising the risk of intimal dissection and clot formation at precisely the junction where the flap’s survival is decided.

The hemodynamics of the neck make matters worse. Recipient vessels there sit near the carotid artery, which delivers blood at high flow velocity and pressure. Studies have documented a progressive increase in arterial pedicle flow velocity after free tissue transfer, and the external carotid artery, with its large diameter, moves substantially more blood than its distal branches. That torrent is good news for perfusing a flap but bad news for any rough edges inside the anastomosis. Any technique that leaves thrombogenic surfaces exposed to that flow is playing with fire.

Mechanical coupling devices emerged as one answer. These ring-based couplers evert the vessel ends circumferentially over the device, producing reliable intima-to-intima contact and keeping foreign material out of the vessel lumen. They have been widely adopted, particularly for veins. But couplers come with constraints: they only work within certain vessel diameter ranges, mismatches in vessel size can render them unsuitable, they add cost, and they are not always available in every operating room, especially in resource-limited settings. The Japanese team set out to reproduce the coupler’s geometric advantage purely by hand.

The ESVA technique is elegantly mechanical in its logic. The surgeon everts the outer vessel wall outward while inserting the needle at a perpendicular, 90-degree angle through the everted tissue. After everting the opposing vessel wall, the needle is positioned on the intimal side, ensuring that the two intimal surfaces face each other before penetration. The wall is then pushed from the outside to allow needle passage, and because the tissue remains everted after the needle goes through, the suture can be tied directly in that configuration. Repeated around the circumference, the sequence yields a finished connection in which the endothelial surfaces are closely apposed, mimicking the coupler’s result with no intraluminal foreign body.

To make the method reproducible, the team classified vessel quality into four intraoperative categories: Type 1 vessels that evert easily without atherosclerosis, Type 2 vessels that evert despite atherosclerosis or inflammatory hardening, Type 3 vessels that can be everted only with technical difficulty due to atherosclerosis, calcification, or scarring, and Type 4 vessels that cannot be everted at all. The classification matters because eversion is the anatomical prerequisite of the entire technique. Of 61 end-to-end anastomoses, only three, roughly 4.9 percent, involved Type 4 vessels and required conventional non-everting sewing; the remaining 95.1 percent were successfully completed with ESVA, a remarkable adoption rate in a patient population defined by hostile vessels.

The timing results add a second layer of interest. All anastomoses were performed by a single surgeon with more than a decade of microsurgical experience, working at approximately 10 to 20 times magnification. The team compared two suture materials: standard nylon monofilament with 6-millimeter micro-taper needles, and ACRI+Asflex, a polyvinylidene fluoride monofilament carrying ultra-sharp needles of the same size, used in 9-0 and 8-0 gauges. Arterial anastomosis time fell from 23.4 to 20.8 minutes with the sharper suture, and venous time dropped from 21.4 to 19.2 minutes, differences that reached statistical significance. The advantage grew as vessel quality worsened: in Type 3 cases, venous anastomosis time fell from 24.8 to 19.5 minutes, one of the largest gaps in the study.

Those minute-or-two savings may sound trivial, but in complex head and neck reconstruction they compound meaningfully. Shorter anastomosis time translates into reduced flap ischemia duration, smoother operative workflow, and less surgeon fatigue during procedures that demand sustained precision. In vessels already compromised by calcification or scarring, improved needle penetrability also means fewer passes and less unnecessary manipulation of fragile walls. The authors note that while the suture’s properties complement the technique, ESVA itself defines the anastomotic geometry; the ultra-sharp needle maintains penetrability in hardened tissue while the material provides secure knots with minimal loosening.

The study’s own limitations temper the enthusiasm, and the authors are candid about them. The design was retrospective, the cohort small, and the experience single-surgeon, so the results speak to one expert’s hands rather than the broad surgical community. The sharper suture was introduced partway through the study period, meaning growing procedural familiarity may partly explain the speed gains. There was no concurrent control group using couplers, long-term patency was not assessed, and because some patients contributed more than one anastomosis, the observations are not fully independent. Still, the safety record is unambiguous in this series: no macroscopic intimal damage was visible under the operating microscope, and every flap survived. The team suggests ESVA may also suit small-caliber vessels of roughly 1 to 1.5 millimeters and venous size mismatches where couplers falter, though dedicated studies are needed. If larger, multicenter trials confirm these findings, a technique that requires only thread, skill, and a microscope could bring coupler-grade vascular reliability to operating rooms that have never had access to the devices at all.

Subject of Research: A hand-sewn evert-style microvascular anastomosis technique for head and neck free flap reconstruction

Article Title: Evert style vessel anastomosis: a standardized hand-sewn technique for intima-to-intima contact in microvascular reconstruction

Article References: Matsui, C., Tanaka, T., Arai, G., Arai, T., Sasaki, M., Escandón, J. M., Tachibana, K., & Mizuno, H. (2026). Evert style vessel anastomosis: a standardized hand-sewn technique for intima-to-intima contact in microvascular reconstruction. BMC Plastic and Reconstructive Surgery, 2(1), Article 10. https://doi.org/10.1186/s44452-026-00022-y

Image Credits: AI Generated

DOI: 10.1186/s44452-026-00022-y

Keywords: microsurgery, vessel anastomosis, free flap reconstruction, head and neck cancer, microvascular coupler, intima-to-intima contact, thrombosis, suture technique, reconstructive surgery, vascular complications, ACRI+Asflex suture, Evert

Transfemoral TAVI has become the treatment of choice for patients with severe aortic stenosis who face elevated surgical risk, and its use is steadily expanding into lower-risk populations. The procedure involves threading a collapsible replacement valve through the femoral artery to the heart, a route that demands large-bore sheaths, often 14 French or larger, to deliver the prosthesis. In the technique’s early years, major vascular complications occurred in roughly 15 percent of patients, a figure that made the femoral access site the most dangerous few centimetres of the entire operation. The protection wire technique, introduced in 2010, was conceived as an insurance policy: an additional guidewire placed via the ipsilateral or contralateral femoral artery, providing immediate endovascular access for percutaneous bailout if catastrophic injury occurred at the primary puncture site.

But the landscape has shifted dramatically since 2010. Lower-profile delivery systems, ultrasound-guided puncture, refined vascular closure strategies, and the growing use of transradial secondary access have pushed major vascular complication rates below 2 percent in low-risk populations. Against that backdrop, the protection wire has begun to look less like a safety net and more like a source of its own problems, because it requires an additional arterial puncture that must itself be managed, compressed, and closed. The Mainz team, led by Marc Adrian Rogmann and Martin Geyer, exploited a natural experiment embedded in their institutional practice: until November 2021, protection wire placement was standard of care for every transfemoral TAVI, after which the wire was abandoned except in operator-selected high-risk cases.

The results were striking. The composite of minor and major vascular complications, classified according to the Valve Academic Research Consortium-3 criteria, occurred in 18.6 percent of patients in the routine protection wire era compared with just 10.8 percent after the protocol change, a difference that was highly statistically significant. Major vascular complications were numerically less frequent without routine wire use, at 2.5 percent versus 4.2 percent, and in-hospital mortality was low and comparable between the two groups, at 2.3 percent and 2.8 percent respectively. Most tellingly, 34.8 percent of all access-related vascular complications in the routine wire group were directly attributable to the protection wire access itself, with the vast majority being minor bleedings at the ipsilateral distal femoral puncture site.

The technical explanation for this pattern is instructive. The protection wire access point, typically a small distal puncture through a 4 French sheath, is not covered by the primary closure device or the pressure dressing applied at the main access site. The researchers propose that many of these injuries arose not from technically inadequate punctures but from insufficient haemostatic compression at a site that the standard closure routine simply overlooks. In the routine wire group, 80.1 percent of protection wires were positioned ipsilaterally, meaning two punctures in the same femoral artery, one of which received far less haemostatic attention. The wire was actively used for intervention in only 25 cases, or 3.1 percent of the routine group, suggesting that the insurance policy paid out far less often than it cost in collateral injury.

Bleeding metrics reinforced the picture. Type 1 and type 2 bleedings under the VARC-3 classification occurred significantly less often without routine wire placement, at 3.3 percent versus 6.1 percent and 3.3 percent versus 7.6 percent respectively. The median haemoglobin drop was smaller in the wire-free era, decreases greater than 3 grams per decilitre were less frequent, and post-procedural haemoglobin values were slightly higher. Procedural times were marginally shorter without the wire, fluoroscopy times were essentially identical, and blood transfusion rates remained low and comparable, indicating that omitting the wire imposed no penalty on procedural efficiency or safety rescue capability.

In a multivariable logistic regression model covering 1,417 patients, the absence of a routine protection wire was independently associated with a lower risk of vascular complications, with an odds ratio of 0.52 and a 95 percent confidence interval of 0.38 to 0.72. Female sex emerged as an independent predictor of increased risk, with an odds ratio of 1.82, consistent with prior evidence attributing the excess to smaller vessel diameters and greater vessel fragility. The closure strategy also mattered: a combination of two suture devices plus one plug-based device was associated with higher odds of complications than suture-only closure, although the authors caution that this combination was typically deployed as a rescue when primary suture haemostasis failed, introducing confounding by indication that limits generalisation.

The findings sit in tension with the SURF-TAVR registry, the largest multicentre study of protection wire use to date, which reported fewer major vascular complications with routine wire placement, at 1.1 percent versus 2.4 percent. The Mainz authors point to important procedural differences: their routine wire era relied exclusively on angiographic rather than ultrasound-guided puncture, their secondary access was predominantly transradial rather than femoral, and their wire placement was overwhelmingly ipsilateral. Both studies, however, converge on one consistent message: overall vascular complication rates were higher with routine protection wire use, driven mainly by minor secondary-access injuries. The authors are candid about the limitations of their before-and-after design, acknowledging that calendar time, evolving case mix, and concurrent refinements in technique cannot be fully disentangled from the wire strategy itself, and that a prospective randomised trial would be needed to isolate the effect.

Nevertheless, the study’s strengths lend it weight. All patients were included consecutively, outcomes were assessed with standardised VARC-3 definitions, and the systematic documentation of complications by individual access site offers a granularity that multicentre registries cannot match. As TAVI continues its expansion into broader and lower-risk populations, the message from Mainz aligns with the broader minimalist turn in structural heart intervention: minimise access burden, favour ultrasound-guided puncture, choose closure devices carefully, and reserve the protection wire for the individual patients whose anatomy and risk profile genuinely warrant it. In contemporary practice, the best safety wire may be the one you never place.

Subject of Research: Impact of routine versus selective femoral protection wire use on vascular complications in transfemoral TAVI

Article Title: Routine versus selective use of a femoral protection wire in transfemoral TAVI: a single-centre analysis of vascular complications

Article References: Rogmann, M. A., Klingemann, V., Meertens, M., Ahoopai, M., Rommel, K.-P., Lurz, P., von Bardeleben, R. S., & Geyer, M. (2026). Routine versus selective use of a femoral protection wire in transfemoral TAVI: a single-centre analysis of vascular complications. Clinical Research in Cardiology. https://doi.org/10.1007/s00392-026-03015-0

Image Credits: AI Generated

DOI: 10.1007/s00392-026-03015-0

Keywords: TAVI, vascular complications, protection wire, femoral access, VARC-3, transcatheter aortic valve implantation, vascular closure devices, transradial access, aortic stenosis, bleeding events, interventional cardiology, Routine