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Updated: Sep 29, 2025
Interventional Diagnostic Procedure: A Practical Guide for the Assessment of Coronary Vascular Function
Published on: March 15, 2022
Randomized Clinical Trial on Prevention of Radial Occlusion After Transradial Access Using Nitroglycerin: PATENS
Roberto L da Silva1, Pedro B de Andrade2, George Dangas3
1Department of Interventional Cardiology, Instituto Dante Pazzanese de Cardiologia, São Paulo, Brazil; Department of Interventional Cardiology, Instituto de Cardiologia de Santa Catarina, São José, Brazil; Department of Cardiology, Hospital Universitário Prof Polydoro Ernani de São Thiago, Florianópolis, Brazil.
Objectives:
The aim of this study was to evaluate whether administration of nitroglycerin at the beginning or end of a transradial approach (TRA) procedure would preserve radial patency.
Background:
The TRA is becoming the preferred vascular access route in coronary interventions. Radial artery occlusion (RAO) is the most frequent complication. Routine vasodilator treatment aims to reduce spasm and possibly prevent RAO.
Methods:
The authors designed a prospective, multicenter, randomized, double-blind, 2-by-2 factorial, placebo-controlled trial encompassing patients undergoing the TRA. Patients were randomized to either 500 μg nitroglycerin or placebo; each arm was also subrandomized to early (upon sheath insertion) or late (right before sheath removal) nitroglycerin administration to evaluate the superiority of nitroglycerin in the prevention of RAO with 24 hours on Doppler ultrasound.
Results:
A total of 2,040 patients were enrolled. RAO occurred in 49 patients (2.4%). Fifteen of these patients (30.6%) showed re-establishment of flow at 30 days. Nitroglycerin, compared with placebo, did not reduce the risk for RAO at either of the 2 time points (early, 2.5% vs 2.3% [P = 0.66]; late, 2.3% vs 2.5% [P = 0.66]). By multivariable analysis, the presence of spasm (OR: 3.53; 95% CI: 1.87-6.65; P < 0.001) and access achieved with more than 1 puncture attempt (OR: 2.58; 95% CI: 1.43-4.66; P = 0.002) were independent predictors of RAO.
Conclusions:
The routine use of nitroglycerin was not associated with a reduction in the rate of RAO, regardless of the time of administration (at the beginning or end of the TRA procedure).
