Buttonhole vs rope ladder vs area cannulation: AV fistula cannulation methods

There are three ways to distribute needle sites along an arteriovenous fistula: rope ladder, area and buttonhole. This guide explains how each technique works, what the KDOQI 2019 and Spanish GEMAV guidelines say, when each one is used and how ultrasound helps you plan a rope ladder.

Updated October 10, 2026 · 8-minute read

The three AV fistula cannulation techniques

Rope ladder cannulation

Needle sites are spread evenly along the whole arterialized vein (or the body of the graft). At each session you choose two new sites, so the skin heals between sessions [2]. The vein dilates moderately and evenly, with few or no aneurysms. The main limitation is that it needs a vein with a long enough course to rotate sites [2]. According to Nefrología al día, it can also mean more pain and more missed cannulations [3].

Area cannulation

Needle sites are concentrated in a small zone of 2–3 cm [3], within millimeters of previous sites [1]. It is often used because the vein is short or difficult, because staff believe cannulation elsewhere will fail, or because the patient refuses other sites [2]. It hurts less and fails less often [3], but repeated punctures damage the wall. In native fistulas it causes aneurysms, and in grafts, pseudoaneurysms and thrombosis [2]. It is also associated with stenosis and turbulence [3]. KDOQI calls it a poor technique that damages the access and should be avoided [1].

Buttonhole cannulation

The needle always goes in at the same spot, at the same angle and to the same depth. Over 6–10 sessions, ideally the same cannulator inserts a sharp needle along the same track until a tunnel of scar tissue forms down to the vein wall [2]. From then on, blunt needles are used; they follow the tunnel without cutting, and any trained staff member, or the patient, can cannulate. One arterial and one venous buttonhole are created [2].

Asepsis is critical. Both sites must be disinfected before and after every session, and the scab from the previous session must be removed completely. Never remove the scab with the same blunt needle you will cannulate with [2]. Buttonholes are only for native fistulas: never in PTFE grafts [1,2].

What the guidelines say

Guidelines agree on preferring the rope ladder and avoiding area cannulation, but not on the role of buttonholes in home hemodialysis: some sources prefer them [3], while KDOQI keeps them for when the rope ladder fails [1].

Pros and cons: what the evidence shows

Buttonhole vs rope ladder

• Fistula survival: no difference. In a trial of 140 patients, median access survival was 16.0 months with standard (rope ladder) needling and 18.4 months with buttonhole. Infections occurred only in the buttonhole group, and 46 of 70 patients abandoned buttonhole needling after a median of 11.3 months [4].
• Infection: the main risk. In the KDOQI evidence review, S. aureus bacteremia occurred in 13% with buttonhole vs 0% with rope ladder at 1 year [1]. Systematic reviews link buttonhole cannulation to more local and systemic infections [5,6]; in one of them, the infection risk was about three times higher [2,6].
• Pain: equivocal evidence. Observational studies suggest less pain with buttonholes, but randomized trials don't confirm it [5].
• Hematomas and aneurysms: GEMAV links buttonholes to fewer hematomas and aneurysms, based on low-quality evidence [2]. In one trial using a buttonhole device (buttonhole-peg), existing aneurysms enlarged less often than with different-site cannulation (23% vs 67%) [1].

Area cannulation

In a study of 7,058 patients from 171 units in nine countries, 65.8% were cannulated by the area technique, 28.2% by rope ladder and 6% by buttonhole. Area cannulation was associated with a significantly higher risk of access failure than rope ladder or buttonhole [7].

Comparison of cannulation techniques

When is each technique used?

• Routine: rope ladder, in native fistulas and grafts [1,2].
• Short cannulation segment, or a tortuous or deep vein: the classic indication for buttonholes [1,2]. Before deciding, scan the vein with ultrasound: there are often more usable segments than you can feel.
• Aneurysms: don't cannulate the aneurysmal segment if there are alternatives; if there are none, cannulate the sides (base), never the top [1]. KDOQI accepts buttonholes for a large or enlarging aneurysm, to prevent further expansion [1]. See the aneurysm guide for details.
• Self-cannulation and home hemodialysis: KDOQI supports teaching self-cannulation to eligible patients [1]. GEMAV offers it with rope ladder and, in selected cases, with buttonholes [2]. KDOQI reserves buttonholes for cannulators who cannot use the rope ladder and have excellent hygiene and technique [1].

Ultrasound and rope ladder planning

A rope ladder only works if you know how much usable vein you have. With ultrasound you can:

1. Follow the vein in short axis from the anastomosis and mark where diameter and depth allow cannulation.
2. Find what to avoid: stenoses, aneurysms, thrombus, collaterals and hematomas.
3. Measure the length of each straight segment and lay out the arterial and venous zones on it, with the distances in your protocol.
4. Draw a cannulation map. GEMAV proposes, as a quality indicator, the percentage of patients with a graphic record of their cannulation sites [2].

The usual reasons for falling back on area cannulation (a short vein, a difficult course, fear of missing elsewhere) [2] are exactly what ultrasound can clarify. KDOQI also considers it reasonable for proper needle placement in select patients [1]. No trial has shown that ultrasound reduces area cannulation, but it gives you the information to rotate sites safely. Over an aneurysm, ultrasound measures the tissue covering the dome and shows any mural thrombus before you choose a site. For the technique itself, see the ultrasound-guided cannulation guide.

Educational content. It does not replace supervised hands-on training or your unit's protocols.

References

1. Lok CE, Huber TS, Lee T, et al. KDOQI Clinical Practice Guideline for Vascular Access: 2019 Update. Am J Kidney Dis. 2020;75(4 Suppl 2):S1–S164. doi.org
2. Ibeas J, Roca-Tey R, Vallespín J, et al. Spanish Clinical Guidelines on Vascular Access for Haemodialysis (GEMAV). Nefrologia. 2017;37(Suppl 1):1–191. doi.org
3. Moyano Franco MJ, Salgueira Lazo M, Roca-Tey R. Punción ecoguiada del acceso vascular para hemodiálisis [Ultrasound-guided cannulation of hemodialysis vascular access]. In: Lorenzo V, López Gómez JM (eds). Nefrología al día. 2023. In Spanish. nefrologiaaldia.org
4. MacRae JM, Ahmed SB, Hemmelgarn BR; Alberta Kidney Disease Network. Arteriovenous fistula survival and needling technique: long-term results from a randomized buttonhole trial. Am J Kidney Dis. 2014;63(4):636–642. doi.org
5. Wong B, Muneer M, Wiebe N, et al. Buttonhole versus rope-ladder cannulation of arteriovenous fistulas for hemodialysis: a systematic review. Am J Kidney Dis. 2014;64(6):918–936. doi.org
6. Muir CA, Kotwal SS, Hawley CM, et al. Buttonhole cannulation and clinical outcomes in a home hemodialysis cohort and systematic review. Clin J Am Soc Nephrol. 2014;9(1):110–119. doi.org
7. Parisotto MT, Schoder VU, Miriunis C, et al. Cannulation technique influences arteriovenous fistula and graft survival. Kidney Int. 2014;86(4):790–797. doi.org