Causes of Death Myotonic Dystrophy – Survival to age 65 lower

This is an older study from 1998 but many folks ask about the longevity with this disease. How long will I live with myotonic dystrophy?

Age and causes of death in adult-onset myotonic dystrophy.

Brain

(1998) 121 (8): 1557-1563. doi: 10.1093/brain/121.8.1557

  1. C E de Die-Smulders,
  2. C J Höweler,
  3. C Thijs,
  4. J F Mirandolle,
  5. H B Anten,
  6. H J Smeets,
  7. K E Chandler and
  8. J P Geraedts

+ Author Affiliations


  1. Department of Clinical Genetics, Academic Hospital Maastricht, The Netherlands. christine.dedie@gen.unimaas.nl

Summary

Myotonic dystrophy is a relatively common type of muscular dystrophy, associated with a variety of systemic complications. Long term follow-up is difficult because of the slow progression. The objective of this study was to determine survival, age at death and causes of death in patients with the adult-onset type of myotonic dystrophy. A register of myotonic dystrophy patients was set up in Southern Limburg (the Netherlands), using data longitudinally collected over a 47-year period (1950-97). Survival for 180 patients (from the register) with adult-onset type myotonic dystrophy was established by the Kaplan-Meier method. The median survival was 60 years for males and 59 years for females. Survival of the patients was also estimated from the age of 15 years to the ages of 25, 45 and 65 years and compared with the expected survival of age- and sex-matched birth cohorts from the normal Dutch population. The observed survival to the ages of 25, 45 and 65 years was 99%, 88% and 18% compared with an expected survival of 99%, 95% and 78%, respectively. Thus, survival to the age of 65 in patients with adult-onset myotonic dystrophy is markedly reduced. A weak positive correlation between the CTG repeat length and younger age at death was found in the 13 patients studied (r = 0.50, P = 0.08). The cause of death could be determined in 70 of the 83 deceased patients. Pneumonia and cardiac arrhythmias were the most frequent primary causes of death, each occurring in approximately 30%, which was far more than expected for the general Dutch population. In addition, we assessed mobility in the years before death in a subgroup of 18 patients, as a reflection of the long-term physical handicap in myotonic dystrophy patients. Half of the patients studied were either partially or totally wheelchair-bound shortly before their death.

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One thought on “Causes of Death Myotonic Dystrophy – Survival to age 65 lower

  1. This summary does not indicate whether the population in the study had Type 1 or Type 2 MMD. Therefore, the results can be easily questioned by anyone with only a modicum of statistical knowledge. I know someone with MMD Type 2 who is 87 years old and doing pretty well. I am 65 years old and in excellent health with MMD Type 2 as well. Those who died of pneumonia may have had difficulty swallowing leading to an aspiration pneumonia. Since MMD Type 2 was only recently identified in 2003 I assume the cohort was mixed in this study or possibly all had MMD Type 1 which is a more severe disease with a known poorer prognosis.

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