Ophthalmoplegia in diabetes mellitus: a retrospective study

Ophthalmoplegia, despite being a rare entity in diabetes mellitus, is associated with great anxiety for the patients and often appears to be a serious problem from a diagnostic and therapeutic point of view. There have been few studies primarily concerned with the relative frequencies and clinical characteristics of oculomotor neuropathies in diabetic subjects. Those published have emanated largely from neurological and/or ophthalmological referral centres rather than metabolic departments. Objective of this study was to determine the incidence, the clinical characteristics and risk factors for developing ophthalmoplegia among persons with diabetes mellitus. We have performed a retrospective study of all diabetic patients with ophthalmoplegia who were seen in the Metabolic Division at "S. Biagio" Hospital, Marsala, over the 10 year period from 1998 to 2007. A detailed history and blood laboratory profile were obtained for each patient. During the period of the survey a total of 6,765 diabetic subjects were hospitalised and ophthalmoplegia was identified in 27 patients (0.40%). Isolated III nerve palsies accounted for the majority of patients (59.3%), with VI nerve palsies (29.6%) occurring more frequently than multiple palsies (11.1%). These patients had a marked comorbidity and were found to have a poorly controlled diabetes. The patients with VI nerve palsies showed a tendency toward a higher coexistence of diabetic retinopathy and cardiovascular risk factors than those with III cranial nerve palsies. Ophthalmoplegia is a serious and not common problem among patients with diabetes mellitus; the oculomotor nerve was most frequently affected in our case-report. The fact that the coexistence of diabetic complications and cardiovascular risk factors was slightly higher in patients with VI nerve palsy is compatible with the hypothesis that this ischemic event might be more closely related to diabetes and metabolic syndrome in its pathogenesis.