A noninvasive technique for determining systemic vascular resistance showed excellent correlation with conventional cardiac catheterization methods (r = 0.85).
Cross-Sectional (n=30)
Does a noninvasive technique using ultrasound and sphygmomanometry accurately measure systemic vascular resistance compared to conventional cardiac catheterization?
A noninvasive technique combining ultrasound and sphygmomanometry provides accurate measurements of systemic vascular resistance comparable to invasive cardiac catheterization.
Effect estimate: r = 0.85
Measurement of systemic vascular resistance in man currently requires arterial and venous cannulation, so that cardiac output and mean arterial blood pressure may be simultaneously determined. This report describes a noninvasive technic for determining systemic vascular resistance (SVR n ), utilizing an ultrasonic method for cardiac output measurement, and a combination of sphygmomanometry and external carotid pulse tracing analysis for determination of mean arterial blood pressure. SVR n was measured by this technic in 18 patients and compared with systemic vascular resistance determined by conventional methods at cardiac catheterization (SVR c ). There was excellent correlation, with SVR c = 0.865 SVR n +216 and r = 0.85. The sensitivity of the method was verified in studies on 12 normal subjects in whom SVR n while supine (1235 ± 61 dyne-sec-cm –5 , mean ± se ) was less than SVR n while standing (1416 ± 81, P < 0.01) and greater than SVR n supine after amyl nitrite inhalation (652 ± 41, P < 0.0001). It is concluded that this noninvasive, simple, and safe technic should prove to be a useful bedside method for routine clinical measurement of systemic vascular resistance.
Stefadouros et al. (Mon,) reported a cross-sectional. Noninvasive technique for determining systemic vascular resistance vs. Conventional methods at cardiac catheterization was evaluated on Correlation between noninvasive and conventional systemic vascular resistance (r = 0.85). A noninvasive technique for determining systemic vascular resistance showed excellent correlation with conventional cardiac catheterization methods (r = 0.85).