Endovascular Access, Wires, Sheaths, Closure, and Complication Rescue

15.1Principles of endovascular access

Endovascular procedures rely on the Seldinger technique, in which a controlled puncture is followed by passage of a flexible guidewire and coaxial sheath advancement to avoid an unprotected arteriotomy Seldinger 1953. Transluminal access treats the access site as a gateway to cross and dilate obstructive disease without open surgical exposure, requiring the access route to accommodate the target lesion, device profile, and bailout pathway Dotter and Judkins 1964.

Wire choice follows a wire-first discipline. Guidewires group by diameter into three platforms: 0.035 inch for aortoiliac and large-bore work, 0.018 inch for intermediate targets, and 0.014 inch for tibial and chronic-total-occlusion crossing. Negotiate the vessel first with a soft atraumatic or steerable-tip wire (Bentson, angled hydrophilic Glidewire), then exchange to a stiff or extra-stiff body wire (Amplatz Super Stiff, Lunderquist Extra Stiff) to track large-bore sheaths and devices Large-bore Access Review 2024. Hydrophilic wires cross tight or tortuous segments but are exchanged out before device delivery, since their low friction and non-radiopaque tip raise the risk of dissection, perforation, and loss of position.

15.2Access route selection

Transfemoral common-femoral access is the default for most peripheral and large-bore interventions. For elective bifurcated endovascular aneurysm repair (EVAR), totally percutaneous access and surgical cut-down demonstrate comparable short-term mortality, aneurysm exclusion, hematoma, and wound infection rates, while the percutaneous approach reduces operative time by approximately 21 minutes Cochrane EVAR Access 2023. A dedicated EVAR closure substudy reported a 6% major complication rate for percutaneous closure versus 10% for surgical exposure, with shorter overall procedure times (107 versus 141 minutes) PEVAR Substudy 2013. Large-bore transfemoral access requires preprocedural computed tomography angiography (CTA) to assess vessel diameter, calcification, and tortuosity, alongside an established bailout pathway Large-bore Access Review 2024. Size the access quantitatively by the sheath-to-femoral-artery ratio (SFAR), the sheath outer diameter divided by the minimal common-femoral luminal diameter. An SFAR above 1.05 predicts a higher rate of VARC major vascular complications (30.9% versus 6.9%) and higher 30-day mortality (18.2% versus 4.2%), so keep the ratio at or below 1.0, most achievable when the common femoral is non-calcified Hayashida 2011. A device's stated French size denotes its inner lumen; the outer diameter runs roughly 1.5 to 2 French larger and is what must fit the artery. Heavy anterior-wall or circumferential calcification is a relative contraindication to percutaneous large-bore access regardless of diameter.

Radial access reduces bleeding and hospital length of stay, establishing it as the preferred route for many percutaneous procedures Transradial Consensus 2018. Peripheral radial access requires preprocedural assessment of radial artery size and ulnar collateral flow, ultrasound-guided puncture, and protocol-driven patent hemostasis Chinese Transradial Consensus 2023.

Brachial access is a discrete upper-extremity option for antegrade lower-limb or visceral work, kept to smaller sheaths to limit brachial-sheath bleeding and nerve injury; in fenestrated or branched EVAR, upper-extremity access carries higher stroke, myocardial infarction, and mortality than total transfemoral routes VQI Upper Extremity Access 2023. When antegrade crossing of an infrainguinal chronic total occlusion fails, ultrasound-guided retrograde puncture of a distal target (distal superficial femoral or popliteal, or a tibial or pedal vessel: anterior tibial or dorsalis pedis, posterior tibial, or peroneal) with a low-profile 0.014 or 0.018 inch system enables retrograde or bidirectional crossing. A meta-analysis of 1,910 limbs reported 96% technical success with infrequent access-site perforation (2.1%) and flow-limiting dissection (0.6%) Giannopoulos 2021.

When transfemoral access is unavailable (affecting 5% to 12% of transcatheter structural candidates), extrathoracic routes (transaxillary, transcarotid, transcaval) are prioritized over intrathoracic routes (transaortic, transapical) because intrathoracic approaches carry up to a two-fold higher early mortality risk Alternative TAVR Access 2024. Transcaval access demands CT identification of a calcium-free aortocaval target and nitinol occluder closure Transcaval Access 2022. For complex fenestrated or branched EVAR, total transfemoral access using steerable sheaths is preferred over upper-extremity adjuncts, as upper-extremity access is associated with higher stroke, myocardial infarction, and mortality rates VQI Upper Extremity Access 2023.

15.3Entry and closure technique

Ultrasound-guided common-femoral access improves first-pass success (odds ratio 3.35), reduces time to successful access by approximately 17 seconds, and decreases unintentional vein puncture (odds ratio 0.26) compared with anatomic landmark guidance Cochrane Ultrasound Access 2025. The major bleeding reduction associated with ultrasound guidance is observed primarily in patients receiving vascular closure devices, where complications fall from 23.4% to 11.8%, with no significant benefit demonstrated for manual compression cases in the UNIVERSAL trial subgroup analysis UNIVERSAL Trial Substudy 2023.

Collagen-plug closure devices reduce groin hematoma and pseudoaneurysm rates compared with manual compression, whereas metal-clip and suture-based devices show no significant difference from compression for these outcomes Cochrane VCD 2016. Antegrade closure carries similar overall and bleeding complication rates to common-femoral retrograde closure, provided there is adequate working length and imaging-confirmed entry Antegrade Closure Meta-analysis 2021.

For large-bore arteriotomies, plug-based and suture-based closure strategies yield equivalent safety. The MASH pilot trial reported comparable 30-day major or minor vascular complications (10% for plug versus 4% for suture) and clinically relevant bleeding (9% versus 6%) MASH Trial 2021. Larger meta-analyses confirm no significant differences in device success, major vascular complications, bleeding, unplanned surgery, or 30-day mortality between the two classes MANTA vs Perclose Meta-analysis 2025 · Plug vs Suture Meta-analysis 2025. A hybrid strategy combining plug and suture closure for transfemoral transcatheter valve replacement reduced access-site hemostasis failure to 18.2% from 29.8% compared with dual-suture closure alone, while requiring fewer additional bailout devices (0.8% versus 19.0%) TAVR Closure Trial 2025. Sealant-based closure for standard-bore electrophysiology procedures shortens time to hemostasis and ambulation compared with manual compression ReliaSeal Trial 2025.

15.4Access complication rescue

Access-site complications occur in approximately 3.5% of peripheral vascular interventions. While 74.4% are minor, severe complications requiring transfusion (9.7%), thrombin injection (5.4%), or surgical repair (10.5%) increase 30-day mortality to 6.1%, compared with 1.4% for uncomplicated cases BMC2 PVI Registry 2014. Expanding hematoma, loss of distal perfusion, new bruit, disproportionate groin pain, hypotension, or closure-device failure dictate immediate rescue intervention.

Large-bore access complication management

1. Recognize and temporize: Identify closure failure or bleeding instability promptly. Apply manual compression and initiate volume resuscitation while assessing the mechanism of failure.
2. Endovascular bailout: Deploy additional percutaneous closure devices, covered stents, or endoconduits when the vessel is adequately sized and regional anatomy permits Large-bore Access Review 2024.
3. Surgical conversion: Perform open exposure for brisk bleeding, hemodynamic instability, heavy calcification, or an arteriotomy outside the intended segment. Percutaneous rescue maneuvers must not delay definitive surgical control when initial hemostasis fails Large Bore Closure Review 2024.
4. Conduit construction: Construct open iliac conduits for hostile iliofemoral anatomy when percutaneous limits are exceeded or unrecoverable failure is predicted preoperatively Open Iliac Conduits 2025.

Radial artery occlusion occurs in 5.3% of transradial procedures, rising to 7.1% in patients older than 60 years compared with 3.8% in younger cohorts Radial Artery Occlusion 2024. Distal radial access complications are more frequent in women (7.5%) than men (4.1%), though major bleeding is absent Distal Radial Access Registry 2025. Radial rescue relies on preprocedural sizing, protocol-driven anticoagulation, and patent hemostasis. Distal axillary access with a femoral safety wire provides an alternative percutaneous rescue route in highly selected cohorts Percutaneous Trans-axilla 2022.

15.5Postoperative care and follow-up

Access-site surveillance targets the early identification of hematoma, ischemia, femoral stenosis, pseudoaneurysm, and infection. Clinical examination dictates post-procedure care; imaging is reserved for specific symptoms, abnormal physical findings, or observed closure failure. Routine vascular ultrasound is not required after uncomplicated closure, as large-bore trials confirm comparable 3-month femoral artery diameters and peak systolic velocities across standard closure modalities TAVR Closure Trial 2025. Evidence boundaries dictate follow-up intensity; complication profiles derived from coronary or structural heart populations are not uniformly translatable to complex endovascular aneurysm repair or extracorporeal membrane oxygenation access.

15.6Areas of controversy

The superiority of specific large-bore closure devices remains unsettled. While pilot data and meta-analyses show general equivalence between plug-based and suture-based devices for 30-day vascular complications and bleeding, these findings rely heavily on transcatheter valve replacement populations and may not fully capture outcomes in complex peripheral, aneurysm, or heavily calcified access anatomies MANTA vs Perclose Meta-analysis 2025 · MASH Trial 2021. The major bleeding benefit of ultrasound guidance over anatomic landmark access is similarly contested; Cochrane analyses have not statistically proven an overall major bleeding reduction, indicating the benefit is predominantly linked to subsequent closure-device performance rather than puncture safety alone Cochrane Ultrasound Access 2025 · UNIVERSAL Trial Substudy 2023. Furthermore, the safety of total percutaneous access in hostile femoral arteries lacks robust randomized support, as foundational percutaneous EVAR evidence rests on low-certainty trials that routinely exclude adverse anatomies Cochrane EVAR Access 2023.