The effects of interscalene brachial plexus block on humeral arterial blood flow: a Doppler ultrasound study.
In this study we investigated and quantified the effects of interscalene block (ISB) on humeral arterial blood flow (HBF). Eleven patients scheduled for shoulder arthroscopic surgery under ISB were prospectively studied. A Doppler ultrasound of the humeral artery was performed before, and 30 min after, the ISB. The resistance index and the HBF were measured at the level of the midpoint of the upper arm. The median (interquartile range) of resistance index decreased from 0.98 (0.95-1.00) to 0.81 (0.77-0.91) (P < 0.01). The median HBF increased from 32 (18-46) to 88 (59-98) mL/min (P < 0.01). We conclude that ISB enhances arterial blood flow and decreases arterial resistance.
Department of Anesthesiology, Clinique Bordeaux-Mérignac, 9 rue Jean-Moulin, 33700 Mérignac, France. henriiskandar@free.fr
Henri
H
Iskandar
Nicolas
N
Wakim
Antoine
A
Benard
Bertrand
B
Manaud
Joelle
J
Ruel-Raymond
Gyslaine
G
Cochard
Chris
C
Huber
D000577:Amides; D000779:Anesthetics, Local; D001158:Arteries / Q000187:drug effects*; D001182:Arthroscopy; D001917:Brachial Plexus / Q000000981:diagnostic imaging*; D006801:Humans; D008012:Lidocaine; D009407:Nerve Block; D011446:Prospective Studies; D012039:Regional Blood Flow / Q000187:drug effects; D000077212:Ropivacaine; D012782:Shoulder / Q000098:blood supply* / Q000000981:diagnostic imaging* / Q000601:surgery; D014463:Ultrasonography; D014655:Vascular Resistance / Q000187:drug effects
D000577:Amides; D000779:Anesthetics, Local; D000077212:Ropivacaine; D008012:Lidocaine