Clinical significance of heart murmurs detected on cardiac auscultation in cats
Cardiac auscultation is one of the most important clinical tools to identify patients with potential heart disease. Although several publications have reported the prevalence of murmurs in cats, little information is available in relation to the exact origin of the blood flow turbulence responsible for these murmurs. The aim of this study was to determine the prevalence and clinical significance of murmurs detected during physical examination in cats.
Researchers conducted a retrospective evaluation of clinical records and echocardiographic examinations in cats for investigation of heart murmurs.
The team reviewed records of 856 cats with full clinical information. The cause of murmur was identified in 93.1% of cases (72.3% with single blood flow turbulence, 26.4% with two, and 1.3% with three identifiable sources of murmur).
Systolic anterior motion of the mitral valve (SAM) was the primary cause of murmur in this population (39.2%), followed by dynamic right ventricular outflow tract obstruction (DRVOTO) (32%) and flow murmurs (6.9%). Most cats with a murmur (56.7%) did not present any structural cardiac abnormality.
Researchers concluded that this study indicates that some heart murmur characteristics (timing, loudness and point of maximal intensity) can potentially predict the presence of an underlying cardiac disease.
Luca Ferasin, et al. “Prevalence and Clinical Significance of Heart Murmurs Detected on Cardiac Auscultation in 856 Cats.” Vet Sci. 2022 Oct 13;9(10):564. doi: 10.3390/vetsci9100564.
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