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Wideband External Pulse Recorded During Cuff Blood Pressure Measurement: A New Technique for Cardiovascular
Seymour G Blank1, Gary D James2, Mary J Roman3
1Department of Computer Engineering Technology, NYC College of Technology/CUNY, 186 Jay Street V622, Brooklyn, NY, 11201, USA. sblank@citytech.cuny.edu.
Introduction:
The wideband external pulse (WEP) recorded during blood pressure measurement reveals three components (K1, K2, K3). K1 is recorded with cuff pressure (CP) above systolic (SP).
Aim:
To assess whether the K1 pattern contains information about the functional and structural properties of the cardiovascular system.
Methods:
WEP analysis, echocardiography, carotid artery (CA) ultrasonography and applanation tonometry were conducted on 178 hypertensives. K1R, a feature of K1, was defined to provide a measure between the arterial incident and backward reflective waves.
Results:
K1R was strongly correlated to vascular functional and structural parameters compatible with vascular effects of aging and hypertension. ANOVA analysis (K1R < 0 vs K1R > 0) showed that K1R < 0 participants: (1) were older, shorter, weighed less, had a smaller body surface area; (2) had higher SP, pulse (PP) and mean (MP) pressure, lower heart rate (HR), greater total peripheral resistance (TPR), lower cardiac output (CO), and a stiffer arterial system; (3) had a greater left ventricular (LV) relative wall thickness (LVRWT), carotid artery (CA) relative wall thickness (CARWT), CA far-wall intima-media thickness at end diastole (CIMTd) and CA cross-sectional area (CSA) (all p < 0.001). Regressions revealed that age, TPR, SP, gender, and HR predicted K1R (R2 = 0.64) and that PP and K1R predicted CARWT (R2 = 0.14). Logistic regression revealed that age, TPR, SP and aortic diameter differentiated K1R < 0 from K1R > 0 (Nagelkerke R2 = 0.77).
Conclusions:
K1R is related to vascular functional properties, with suggestive evidence that K1R is also related to vascular structural properties and perhaps subsequent cardiovascular risk.
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