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A pilot study of the relationship between Doppler‐estimated carotid and brachial artery flow and cardiac index
Author(s) -
Weber U.,
Glassford N. J.,
Eastwood G. M.,
Bellomo R.,
Hilton A. K.
Publication year - 2015
Publication title -
anaesthesia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.839
H-Index - 117
eISSN - 1365-2044
pISSN - 0003-2409
DOI - 10.1111/anae.13069
Subject(s) - medicine , brachial artery , cardiology , cardiac index , blood flow , peripheral , doppler effect , hemodynamics , carotid arteries , cardiac output , blood pressure , physics , astronomy
Summary We measured carotid and brachial artery blood flow by Doppler ultrasound in 11 human volunteers, and related these to cardiac index and to each other. The median ( IQR [range]) carotid arterial blood flow was 0.334 (0.223–0.381 [0.052–0.563]) l.min −1 on the right and 0.315 (0.223–0.369 [0.061–0.690]) l.min −1 on the left. The brachial arterial blood flow was 0.049 (0.033–0.062 [0.015–0.204]) l.min −1 on the right and 0.039 (0.027–0.054 [0.011–0.116]) on the left. Cardiac index was 3.2 (2.8–3.5 [1.9–5.4]) l.min −1 .m −2 . There was a moderate to good correlation between right‐and left‐sided flows (brachial: ρ = 0.45; carotid: ρ = 0.567). Brachial and carotid flow had no or a negative correlation with cardiac index (right brachial: ρ = −0.145, left brachial: ρ = −0.349; right carotid: ρ = −0.376, left carotid: ρ = −0.285). In contrast to some previous studies, we found that Doppler‐estimated peripheral arterial blood flows only show a weak correlation with cardiac index and cannot be used to provide non‐invasive estimates of cardiac index in man.