Studies of heart disease and failure in aged female squirrel monkeys (Saimiri sp.).
Lesions consistent with heart failure were found in 23 of 88 adult squirrel monkeys that died between 1995 and 1999 at the Squirrel Monkey Breeding and Research Resource (SMBRR). This provided a rationale for a study surveying aged animals in the SMBRR for normal cardiac characteristics, using echocardiography (ECHO) and electro-cardiogram. In the pilot study, ECHO and electrocardiography were performed on 59 healthy female squirrel monkeys aged 10 years or older and 39 five-year-old monkeys. Parameters were heart rate, P-wave duration and amplitude, and PR, QRS, and QT intervals (electrocardiography), and ejection fraction. Two animals with cardiomyopathy were identified and received similar testing. Advanced-study animals had the same measurements, plus left ventricular internal diameter-systole (LVIDs) and -diastole (LVIDd), left atrial diameter-diastole (LADd) and aortic root diameter-diastole (AoRDd) by use of ECHO. Significant differences were found between groups in LADd, and P-wave and QRS interval durations. In a clinical context, these differences were not considered to be substantial. Normal aged female squirrel monkeys had significant increases in heart dimension and longer P- and QRS-wave durations than did monkeys of a five-year-old control group, although the increases were not considered clinically relevant. This study documents myocardial dynamics in healthy saimiri and those with cardiomyopathy.
Brady
Alan G
AG
Department of Comparative Medicine, University of South Alabama College of Medicine, 992 Medical Sciences Building, Mobile, Alabama 36688, USA.
Watford
John W
JW
Massey
Clara V
CV
Rodning
Kai J
KJ
Gibson
Susan V
SV
Williams
Lawrence E
LE
Abee
Christian R
CR
D000375:Aging; D000818:Animals; D006332:Cardiomegaly / Q000473:pathology / Q000662:veterinary; D002320:Cardiovascular Physiological Phenomena; D018450:Disease Progression; D004452:Echocardiography / Q000662:veterinary; D005260:Female; D006333:Heart Failure / Q000000981:diagnostic imaging / Q000503:physiopathology / Q000662:veterinary*; D008992:Monkey Diseases / Q000473:pathology*; D010865:Pilot Projects; D012016:Reference Values; D012453:Saimiri