title: Cardiac output measurements using sonomicrometer crystals on the left ventricle at rest and exercise.
abstract: 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.
authors.affiliation: Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis 95616, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Pascoe
authors.forename: A
authors.initials: A
authors.lastname: Hiraga
authors.forename: S
authors.initials: S
authors.lastname: Hobo
authors.forename: E K
authors.initials: EK
authors.lastname: Birks
authors.forename: T B
authors.initials: TB
authors.lastname: Yarbrough
authors.forename: T
authors.initials: T
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Hada
authors.forename: H
authors.initials: H
authors.lastname: Aida
authors.forename: E P
authors.initials: EP
authors.lastname: Steffey
authors.forename: J H
authors.initials: JH
authors.lastname: Jones
mesh_terms: 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