The presence of a vascular waterfall phenomenon in cardiac surgery patients suggests that total systemic vascular resistance may be irrelevant for assessing systemic vasomotor tone.
Challenges SVR utility for vasomotor tone assessment in cardiac surgery; leaves open prospective validation of vascular waterfall effects.
Vascular pressure gradients in cardiac surgery patients suggest the presence of a vascular waterfall phenomenon, which is not affected by CO. Thus, measures of total systemic vascular resistance may become irrelevant in assessing systemic vasomotor tone.
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Maas et al. (2012) studied this question.
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