Cardiac output measurements using sonomicrometer crystals on the left ventricle at rest and exercise.
Eight horses were fitted surgically with 8 ultrasonic sonomicrometer crystals each attached to their left ventricular pericardia and a left atrial catheter. Three horses returned to treadmill performance with a maximum rate of oxygen consumption similar to their presurgical values. These horses were evaluated to determine how well sonomicrometer estimates of cardiac output agreed with those obtained by a steady-state method, the Fick principle. Variance between the 2 was similar to the coefficient of variation (approximately 12.5%) of the Fick estimates. We conclude that left ventricular sonomicrometer measurements in horses appear to give a reasonable estimate of ventricular dimensions and can, therefore, be used potentially to evaluate such variables as diastolic flow.
Pascoe
J R
JR
Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis 95616, USA.
Hiraga
A
A
Hobo
S
S
Birks
E K
EK
Yarbrough
T B
TB
Takahashi
T
T
Hada
T
T
Aida
H
H
Steffey
E P
EP
Jones
J H
JH
D000818:Animals; D002302:Cardiac Output / Q000502:physiology*; D003460:Crystallization; D004562:Electrocardiography / Q000379:methods / Q000662:veterinary; D005080:Exercise Test / Q000662:veterinary; D005260:Female; D006736:Horses / Q000502:physiology*; D008297:Male; D010101:Oxygen Consumption; D010805:Physical Conditioning, Animal / Q000502:physiology*; D016276:Ventricular Function