The effects of loading changes on intraoperative Doppler assessment of mitral regurgitation.
Anesthetic agents may significantly alter the patient's blood pressure, and thus affect the intraoperative assessment of mitral regurgitation. This study examined the impact of an increase in afterload on a variety of parameters thought to reflect the severity of mitral regurgitation, and related them to changes in hemodynamic parameters. Twenty-four patients with mitral regurgitation undergoing cardiac surgery were studied. Following the induction of anesthesia, color-flow mapping of the entire left atrium was performed, and pulmonary vein flow was then measured. Phenylephrine was administered to increase the patients' blood pressures to their preoperative values, and the assessment was repeated. Regurgitant jet area increased 56% (482 +/- 405 v 750 +/- 440 mm2 P < 0.001), and there were significant reductions in systolic pulmonary venous velocity (0.33 +/- 0.17 v 0.18 +/- .31 m/s P < .01) with increases in diastolic flow (0.43 +/- 12 v 0.58 +/- 0.18 m/s P < .001). These changes in pulmonary venous flow were not related to the changes in the driving force across the incompetent mitral valve. Also, an additional six patients developed systolic flow reversal after phenylephrine administration. Intraoperative hemodynamic variations can significantly alter the apparent severity of mitral regurgitation, and this factor must be considered during decision making.
Konstadt
S N
SN
Loyola University Medical Center, Maywood, IL.
Louie
E K
EK
Shore-Lesserson
L
L
Black
S
S
Scanlon
P
P
D000328:Adult; D000368:Aged; D001783:Blood Flow Velocity / Q000187:drug effects; D001794:Blood Pressure / Q000187:drug effects*; D002302:Cardiac Output / Q000187:drug effects; D003971:Diastole; D015150:Echocardiography, Doppler; D005260:Female; D006325:Heart Atria / Q000000981:diagnostic imaging / Q000187:drug effects / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000000981:diagnostic imaging* / Q000503:physiopathology*; D016343:Monitoring, Intraoperative; D010656:Phenylephrine / Q000008:administration & dosage / Q000494:pharmacology*; D011651:Pulmonary Artery / Q000187:drug effects / Q000503:physiopathology; D011667:Pulmonary Veins / Q000187:drug effects / Q000503:physiopathology; D011669:Pulmonary Wedge Pressure / Q000187:drug effects; D012039:Regional Blood Flow / Q000187:drug effects; D013599:Systole; D017725:Ventricular Pressure / Q000187:drug effects
D010656:Phenylephrine