The prevalence of murmurs and gallop sounds in anemic cats.

There is little information on the prevalence of auscultatory abnormalities in anemic cats. This study aimed to describe the prevalence of cardiac murmurs and gallop sounds in a population of anemic and nonanemic cats presenting to an emergency room (ER) and to assess whether the prevalence of auscultatory abnormalities was influenced by the severity of anemia. Records of cats presenting to an ER between May 2021 and May 2022 or receiving a blood transfusion between September 2019 and January 2022 were retrospectively analyzed for presence of a murmur or gallop sound. Cats with known structural heart disease were excluded. A murmur was found in 56 of 185 (30%) anemic cats compared with 11 of 102 (11%) nonanemic cats (p < 0.001), with a higher proportion in cats with PCV <16% (p < 0.001). Twenty-five of 185 (14%) anemic cats had a gallop compared with 4 of 102 (4%) nonanemic cats (p = 0.009), with the highest proportion in cats with PCV 11%-20% (p < 0.001). Echocardiography was performed on 17 of 185 anemic cats; 8 had normal echocardiograms and 9 demonstrated evidence of chamber dilation without left ventricular wall thickening, consistent with anemia. Abnormalities on auscultation are common in anemic cats presenting to the ER, with a higher prevalence in more severely anemic cats.