Neurological care and risk of hospital mortality for patients with myasthenia gravis in England

Marguerite Hill ¹ and Yoav Ben-Shlomo ^2*

¹ Univesity of Bristol, United Kingdom
² University of Bristol, United Kingdom

^* To whom correspondence should be addressed. E-mail: y.ben-shlomo{at}bristol.ac.uk.

Accepted 18 July 2007

Abstract

Background: Myasthenia gravis (MG) is a rare neurological disorder, which can be life threatening. Though death is a rare outcome, evidence does not exist as to whether neurological care leads to any better outcome than care by other specialties.

Methods: A matched nested case control study sampled from all public sector hospital admissions in England with a primary diagnosis of myasthenia gravis from 1991-1999. Cases were defined as MG admissions which resulted in death and controls were other MG admissions, matched on sex, age (+/- 2 years) and date of admission (+/- 20 days) that were non fatal. From a total of 18,251 finished consultant episodes with a mention of MG, we were able to create 196 matched sets with 196 fatal admissions and 788 control admissions.

Results: Admission under a neurologist was associated with a 69% reduced risk of death (odds ratio 0.31, 95% CI 0.22 to 0.44, p<0.0001). This was only slightly attenuated after adjustment for a variety of patient-related and hospital covariates (odds ratio 0.37, 95% CI 0.23 to 0.62, p<0.0001).

Conclusions: This is the first evidence that patients admitted with MG are far less likely to die if they are under the care of a neurologist. We cannot determine whether this is due to better management per se or because neurologists are usually based in specialist centres and may have better intensive care support, or both. Alternatively, this may be due to "selection bias" so that neurologists select less seriously ill patients.

Keywords: case control study, mortality, myasthenia gravis, specialist care

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