Cardiomyopathy in limb girdle muscular dystrophy R9, FKRP related

Eric M. Libell, Julia A. Richardson, Katie L. Lutz, Benton Y. Ng, Shelley R.H. Mockler, Katie M. Laubscher, Carrie M. Stephan, Bridget M. Zimmerman, Erik R. Edens, Benjamin E. Reinking, Katherine D. Mathews

Research output: Contribution to journalArticlepeer-review

Abstract

Introduction: Reported frequencies of cardiomyopathy in limb girdle muscular dystrophy R9 (LGMDR9) vary. We describe the frequency and age at onset of cardiomyopathy in an LDMDR9 cohort. Methods: Echocardiograms from 56 subjects (157 echocardiograms) with LGMDR9 were retrospectively reviewed. The cumulative probability of having an abnormal echocardiogram as a function of age was assessed by survival analysis for interval-censored data by genotype. Correlations between cardiac and clinical function were evaluated. Results: Twenty-five (45%) participants had cardiomyopathy. The median age at first abnormal echocardiogram for subjects homozygous for the c.826C>A variant was 54.2 y compared to 18.1 y for all other fukutin-related protein (FKRP) genotypes (P <.0001). There was a weak correlation between ejection fraction and 10-Meter Walk Test speed (r = 0.25), but no correlation with forced vital capacity (r = 0.08). Discussion: Cardiomyopathy is prevalent among those with LGMDR9 and occurs later in subjects homozygous for the c.826C>A mutation. These data will help to guide surveillance and management.

Original languageEnglish (US)
Pages (from-to)626-632
Number of pages7
JournalMuscle and Nerve
Volume62
Issue number5
DOIs
StatePublished - Nov 1 2020
Externally publishedYes

Keywords

  • All neuromuscular disease
  • FKRP
  • cardiomyopathy
  • dystroglycanopathy
  • limb-girdle muscular dystrophy
  • muscular dystrophy

ASJC Scopus subject areas

  • Physiology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Physiology (medical)

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