Calculation of pressure half-time.
Doppler echocardiography is useful in assessing the severity of obstructive cardiac lesions, such as mitral valve stenosis. The Doppler study can be used to calculate pressure half-time (PHT), which is defined as the time required for the pressure gradient across an obstruction to decrease to half of its maximal value. Thus, PHT increases as the severity of stenosis increases. In this report, we describe the methodology involved in measuring PHT in a dog with mitral valve stenosis before and after balloon valvuloplasty.
Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, 3900 Delancey Street, PA 19104, USA. maoyama@vet.upenn.edu
Mark A
MA
Oyama
Jess A
JA
Weidman
Steven G
SG
Cole
D000818:Animals; D002404:Catheterization / Q000662:veterinary*; D004283:Dog Diseases / Q000000981:diagnostic imaging* / Q000628:therapy; D004285:Dogs; D015150:Echocardiography, Doppler / Q000379:methods / Q000662:veterinary*; D008297:Male; D008946:Mitral Valve Stenosis / Q000000981:diagnostic imaging / Q000628:therapy / Q000662:veterinary*; D011312:Pressure; D012720:Severity of Illness Index; D016896:Treatment Outcome