Normal values for left atrial fractional shortening in cats


Following a popular video from Professor Luis Fuentes on our Veterinary Echocardiography channel, a few people wrote in asking for the normal values for LA FS% in cats. In case you missed it, here’s the video:

What are the normal values for feline LA FS?

Reports of mean LA fractional shortening (LAFS%) values in normal cats in the literature have ranged from 25.1 ± 5 %1 to 28.3 (26.9 – 29.7)%2, although some healthy cats will have LAFS% values over 35%.

Reports of mean LAFS% in cats with HCM have ranged from 21 ± 7.8 %1 to 18.1 ± 8.6 %3, although cats with advanced cardiomyopathy often have much lower values.


1.  Abbott JA, MacLean HN. Two-dimensional echocardiographic assessment of the feline left atrium. J Vet Intern Med 2006;20:111-119.

2.  Novo Matos J, Payne JR, Seo J, et al. Natural history of hypertrophic cardiomyopathy in cats from rehoming centers: The CatScan II study. J Vet Intern Med 2022;36:1900-1912.

3.  Payne JR, Borgeat K, Connolly DJ, et al. Prognostic Indicators in Cats with Hypertrophic Cardiomyopathy. Journal of Veterinary Internal Medicine 2013;27:1427-1436.

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