Coaxial guide wire placement in the right adrenal vein for repeated adrenal venous samplings.

PURPOSE: Many adrenal venous sampling (AVS) protocols require repeated samplings before and after adrenocorticotrophic hormone (ACTH) stimulation. Maintaining catheter selectivity in the adrenal vein over time is essential but can be challenging, especially in the short right adrenal vein, where the catheter is often in an unstable position. The aim of our study was to evaluate guide wire insertion into the right adrenal vein catheter to sustain AVS selectivity (adrenal/peripheral cortisol ratio [Ca/Cp]) over time. METHODS: This retrospective investigation was approved by our institutional review board, and informed consent was obtained. A 0.014-inch guide wire was inserted in the right adrenal vein 5F catheter to secure its positioning and to facilitate blood sampling. Plasma cortisol levels from the left and right adrenal veins and left iliac vein were assessed in 117 consecutive patients undergoing bilateral, simultaneous sets of AVS at -5 and 0 min (baseline) and 5, 10, and 15 min after intravenous bolus of 250 µg ACTH (stimulated). Ca/Cp ratios of ≥2 for baseline and >10 for stimulated AVS were considered selective. RESULTS: The first sampling, at time -5 min, was nonselective in 41 of 116 (35.3 %) right and 30 of 116 (25.9 %) left AVSs retained for analysis. In patients with a selective first sampling, 74 of 75 (98.7 %) right and 85 of 86 (98.8 %) left AVSs were selective in all post-ACTH samplings. Right and left selectivity rates were not statistically different (p > 0.87). No complications arose from guide wire insertion. CONCLUSION: Guide wire insertion into the right adrenal vein catheter is safe and effective to maintain AVS selectivity over time.