Effects of median nerve block on radial artery diameter and peak velocity
John J Badal, Annie Kiesau, Patrick Boyle, John J Badal, Annie Kiesau, Patrick Boyle
Abstract
Peripheral artery cannulation is a common procedure but can sometimes be difficult. Our goal was to determine if a median nerve block would increase the diameter and flow of the radial artery. Radial artery diameter and peak velocity was measured using a SonoSite Ultrasound System. Using ultrasound guidance, a median nerve block was performed with lidocaine. Subsequent measurements of the radial artery and peak velocity were again made at 5 minutes post-block and 10 minutes post-block. Mean radial artery diameter measured vertically was 0.23 ± 0.06 cm pre-block, 0.23 ± 0.05 cm at 5 minutes post-block, and 0.23 ± 0.05 cm 10 minutes post-block. Mean radial artery diameter measured horizontally was 0.26 ± 0.05 cm pre-block, 0.27 ± 0.06 cm at 5 minutes post-block, and 0.27 ± 0.08 cm 10 minutes post-block. Peak velocities were 11.3 ± 6.9 cm/s pre-block, increased to 15.0 ± 6.9 cm/s 5 minutes post-block (P = 0.005), and finally increased to 17.7 ± 7.8 cm/s 10 minutes post-block (P = 0.01). This study set out to measure the effects of median nerve blockade on the radial artery. We found a significant increase in peak velocities post-median nerve blockade.
Keywords: median nerve block; radial artery; sympathetic.
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References
- Ebert B, Braunschweig R, Reill P. Quantification of variations in arm perfusion after plexus anesthesia with color doppler sonography. Anaesthesist. 1995;44(12):859–862.
- Iskandar H, Wakim N, Benard A, et al. The effects of interscalene brachial plexus block on humeral arterial blood flow: a Doppler ultrasound study. Anesth Analg. 2005;101:279–281.
- Lindqvist M, Davidson S, Hjemdahl P, Melcher A. Sustained forearm vasodilation in humans during mental stress is not neurogenically mediated. Acta Physiol Scand. 1996;158(1):7–14.
- Breschan C, Kraschl R, Jost R, Marhofer P, Likar R. Axillary brachial plexus block for treatment of severe forearm ischemia after arterial cannulation in an extremely low birth-weight infant. Paediatr Anaesth. 2004;14(8):681–684.
- Mehta Y, Jeneja R. Continuous axillary block for ischemia following failed radial artery cannulation. J Cardiothorac Vasc Anesth. 1994;8(2):257.
Source: PubMed