TY - JOUR
T1 - Quantification of mitral regurgitation by automated cardiac output measurement
T2 - Experimental and clinical validation
AU - Sun, Jing Ping
AU - Yang, Xing Sheng
AU - Qin, Jian Xin
AU - Greenberg, Neil L.
AU - Zhou, Jianhua
AU - Vazquez, Connie J.
AU - Griffin, Brian P.
AU - Stewart, William J.
AU - Thomas, James D.
N1 - Funding Information:
Supported in part by an equipment grant from Toshiba Corporation, Tokyo, Japan, and grant NCC9-60, National Aeronautics and Space Administration, Houston, Texas.
PY - 1998/10
Y1 - 1998/10
N2 - Objectives. To develop and validate an automated noninvasive method to quantify mitral regurgitation. Background. Automated cardiac output measurement (ACM), which integrates digital color Doppler velocities in space and in time, has been Validated for the left ventricular (LV) outflow tract but has not been tested for the LV inflow tract or to assess mitral regurgitation (MR). Methods. First, to validate ACM against a gold standard (ultrasonic flow meter), 8 dogs were studied at 40 different stages of cardiac output (CO). Second, to compare ACM to the LV outflow (ACMa) and inflow (ACMm) tracts, 50 normal volunteers without MR or aortic regurgitation (44 ± 5 years, 31 male) were studied. Third, to compare ACM with the standard pulsed Doppler-two-dimensional echocardiographic (PD-2D) method for quantification of MR, 51 patients (61 ± 14 years, 30 male) with MR were studied. Results. In the canine studies, CO by ACM (1.32 ± 0.3 liter/min, y) and flow meter (1.35 ± 0.3 liter/min, x) showed good correlation (r = 0.95, y = 0.89x + 0.11) and agreement (ΔCO(y - x) = 0.03 ± 0.08 [mean ± SD] liter/min). In the normal subjects, CO measured by ACMm agreed with CO by ACMa (r = 0.90, p < 0.0001, ΔCO = -0.09 ± 0.42 liter/min), PD (r = 0.87, p < 0.0001, ΔCO = 0.12 ± 0.49 liter/min) and 2D (r = 0.84, p < 0.0001, ΔCO = -0.16 ± 0.48 liter/min). In the patients, mitral regurgitant volume (MRV) by ACMm-ACMa agreed with PD-2D (r = 0.88, y = 0.88x + 6.6, p < 0.0001, ΔMRV = 2.68 ± 9.7 ml). Conclusions. We determined that ACM is a feasible new method for quantifying LV outflow and inflow volume to measure MRV and that ACM automatically performs calculations that are equivalent to more time- consuming Doppler and 2D measurements. Additionally, ACM should improve MR quantification in routine clinical practice.
AB - Objectives. To develop and validate an automated noninvasive method to quantify mitral regurgitation. Background. Automated cardiac output measurement (ACM), which integrates digital color Doppler velocities in space and in time, has been Validated for the left ventricular (LV) outflow tract but has not been tested for the LV inflow tract or to assess mitral regurgitation (MR). Methods. First, to validate ACM against a gold standard (ultrasonic flow meter), 8 dogs were studied at 40 different stages of cardiac output (CO). Second, to compare ACM to the LV outflow (ACMa) and inflow (ACMm) tracts, 50 normal volunteers without MR or aortic regurgitation (44 ± 5 years, 31 male) were studied. Third, to compare ACM with the standard pulsed Doppler-two-dimensional echocardiographic (PD-2D) method for quantification of MR, 51 patients (61 ± 14 years, 30 male) with MR were studied. Results. In the canine studies, CO by ACM (1.32 ± 0.3 liter/min, y) and flow meter (1.35 ± 0.3 liter/min, x) showed good correlation (r = 0.95, y = 0.89x + 0.11) and agreement (ΔCO(y - x) = 0.03 ± 0.08 [mean ± SD] liter/min). In the normal subjects, CO measured by ACMm agreed with CO by ACMa (r = 0.90, p < 0.0001, ΔCO = -0.09 ± 0.42 liter/min), PD (r = 0.87, p < 0.0001, ΔCO = 0.12 ± 0.49 liter/min) and 2D (r = 0.84, p < 0.0001, ΔCO = -0.16 ± 0.48 liter/min). In the patients, mitral regurgitant volume (MRV) by ACMm-ACMa agreed with PD-2D (r = 0.88, y = 0.88x + 6.6, p < 0.0001, ΔMRV = 2.68 ± 9.7 ml). Conclusions. We determined that ACM is a feasible new method for quantifying LV outflow and inflow volume to measure MRV and that ACM automatically performs calculations that are equivalent to more time- consuming Doppler and 2D measurements. Additionally, ACM should improve MR quantification in routine clinical practice.
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U2 - 10.1016/S0735-1097(98)00329-5
DO - 10.1016/S0735-1097(98)00329-5
M3 - Article
C2 - 9768735
AN - SCOPUS:0032190619
SN - 0735-1097
VL - 32
SP - 1074
EP - 1082
JO - Journal of the American College of Cardiology
JF - Journal of the American College of Cardiology
IS - 4
ER -