Letters 1111 evidence to support a diagnosis of myasthenia gravis at 2 Gottdiener JS, Sherber HS, Hawley RJ, Engle WK. Cardiac present, we have referred this patient for neurological follow manifestations of polymyositis. Am J Cardiol 1978;41:1131–9. up and review. 3 Lie JT. Cardiac manifestations in polymyositis/dermatomyositis: how to get to the heart of the matter. J Rheumatol 1995;22:809–10. This case demonstrates several of the cardiac manifesta- 4 Miller FM. Current concepts in the idiopathic inflammatory myopathies: tions of polymyositis. It also highlights the possible neurologi- polymyositis, dermatomyositis, and related disorders. Pathogenesis. Ann cal associations with the disease, and the difficulties in subse- Intern Med 1989;111:150–3. quent diagnosis. 5 Aarli, Johan A. Inflammatory myopathy in myasthenia gravis. Current Opin Neurol 1998;11:233–4. 6 Lynch PG. Cardiac involvement in chronic polymyositis. Br Heart J ..................... 1971;33:416–19. Authors’ affiliations 7 Denbow CE, Lie JT, Trancredi RG, Bunch TW. Cardiac involvement in I Morrison, A McEntegart, H Capell, Centre for Rheumatic Disease, polymyositis: a clinicopathologic study of 20 autopsied patients. Arthritis Glasgow Royal Infirmary, Scotland, UK Rhem 1979;22:1088–92. 8 Kehoe RF, Bauernfeind R, Tommaso C, Wyndham C, Rosen KM. Correspondence to: Dr H Capell, Centre for Rheumatic Disease, Glasgow Cardiac conduction defects in polymyositis. Electrophysiologic studies in Royal Infirmary, 84 Castle Street, Glasgow G4 0SF, UK; four patients. Ann Intern Med 1981;94:41–3.
[email protected] 9 Oh SJ, Kim DE, Kuruoglu R, Bradley RJ, Dwyer D. Diagnostic sensitivity of the laboratory tests in myasthenia gravis.