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Review article| Volume 34, ISSUE 5, P1227-1234, September 2004

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Feline hypertrophic cardiomyopathy: an update

      As veterinarians, we find ourselves in a rather awkward position regarding our knowledge about the most common feline heart disease, hypertrophic cardiomyopathy (HCM) [
      • Liu S.K.
      • Maron B.J.
      • Tilley L.P.
      Feline hypertrophic cardiomyopathy: gross anatomic and quantitative histologic features.
      ,
      • Ferasin L.
      • Sturgess C.P.
      • Cannon M.J.
      • Caney S.M.A.
      • Gruffydd-Jones T.J.
      • Wotton P.R.
      Feline idiopathic cardiomyopathy: a retrospective study of 106 cats (1994–2001).
      ]. In the last decade, we have made great progress in our understanding of the disease; yet, we now find ourselves armed with reasonable evidence that there is a great deal we still do not know. We have established that HCM is a heterogeneous disease [
      • Atkins C.E.
      • Gallo A.M.
      • Kurman I.D.
      • Cowen P.
      Risk factors, clinical signs, and survival in cats with a clinical diagnosis of idiopathic hypertrophic cardiomyopathy: 74 cases (1985–1989).
      ,
      • Fox P.R.
      • Liu S.K.
      • Maron B.J.
      Echocardiographic assessment of spontaneously occurring feline hypertrophic cardiomyopathy: an animal model of human disease.
      ,
      • Fox P.R.
      Hypertrophic cardiomyopathy. Clinical and pathologic correlates.
      ,
      • Peterson E.N.
      • Moise N.S.
      • Brown C.A.
      • et al.
      Heterogeneity of hypertrophy in feline hypertrophic heart disease.
      ,
      • Kittleson M.D.
      • Meurs K.M.
      • Munro M.J.
      • Kittleson J.A.
      • Liu S.K.
      • Pion P.D.
      • et al.
      Familial hypertrophic cardiomyopathy in Maine coon cats.
      ,
      • Rush J.E.
      • Freeman L.M.
      • Fenollosa N.K.
      • Brown D.J.
      Population and survival characteristics of cats with hypertrophic cardiomyopathy: 260 cases (1990–1999).
      ,
      • Baty C.J.
      • Malarkey D.E.
      • Atkins C.E.
      • DeFrancesco T.C.
      • Sidley J.
      • Keene B.W.
      Natural history of hypertrophic cardiomyopathy.
      ] and have increasing evidence of a potentially large pool of asymptomatic cats with HCM that are not routinely identified [
      • Atkins C.E.
      • Gallo A.M.
      • Kurman I.D.
      • Cowen P.
      Risk factors, clinical signs, and survival in cats with a clinical diagnosis of idiopathic hypertrophic cardiomyopathy: 74 cases (1985–1989).
      ,
      • Fox P.R.
      • Liu S.K.
      • Maron B.J.
      Echocardiographic assessment of spontaneously occurring feline hypertrophic cardiomyopathy: an animal model of human disease.
      ,
      • Rush J.E.
      • Freeman L.M.
      • Fenollosa N.K.
      • Brown D.J.
      Population and survival characteristics of cats with hypertrophic cardiomyopathy: 260 cases (1990–1999).
      ,
      • Baty C.J.
      • Malarkey D.E.
      • Atkins C.E.
      • DeFrancesco T.C.
      • Sidley J.
      • Keene B.W.
      Natural history of hypertrophic cardiomyopathy.
      ]. Although families of cats with HCM seem to be more similar with regard to clinical manifestations and disease progression, the disparities among unrelated cats with HCM are dramatic. Important questions regarding the genetics of the disease persist despite great efforts to collect, characterize, and even breed families of cats found to be affected by the disease. More importantly, we have not convincingly established many useful risk factors that should help us to guide owners with regard to their pet's prognosis. An important step toward selecting appropriate therapy for cats with HCM that have been presented with diastolic heart failure (HF) has been made with a blind, multicenter, placebo-controlled, prospective clinical trial [

      Fox PR, for the Multicenter Feline Chronic Heart Failure Study Group Prospective. Double-blinded, multicenter evaluation of chronic therapies for feline diastolic heart failure: interim analysis [abstract]. In: Proceedings of the 21st Forum of the American College of Veterinary Internal Medicine. Charlotte, NC, 2003.

      ].
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