Risk factors for ischemic ocular motor nerve palsies.
OBJECTIVE
To identify risk factors associated with neurologically isolated ischemic ocular motor nerve palsies.


METHODS
Case-control study.


METHODS
Multispecialty clinic providing primary, secondary, and tertiary care in central and northern Wisconsin.


METHODS
After applying strict, predetermined, inclusion and exclusion criteria to the medical records of patients with ocular motor nerve palsies, 65 case patients 50 years of age or older were identified with ischemic ophthalmoplegia. A control subject, matched for sex and exact year of age, was randomly selected for each case patient from individuals undergoing a comprehensive medical evaluation.


METHODS
Prevalence of potential risk factors in case patients and controls, including diabetes, hypertension, hypercholesterolemia, coronary artery disease, left ventricular hypertrophy, adiposity, tobacco use, prior ocular motor nerve palsy, and hematocrit. Risk factors were assessed using standardized definitions.


RESULTS
After adjustment for potential confounding factors, significant risk factors and their associated odds ratios (ORs) and 95% confidence intervals (CIs) were as follows: previously diagnosed diabetes, OR = 5.75 (CI = 1.68 to 19.7); left ventricular hypertrophy, OR = 5.20 (CI = 1.30 to 20.82); and, hematocrit (per percentage increase), OR = 1.35 (CI = 1.13 to 1.61).


CONCLUSIONS
In addition to the generally accepted risk factor of diabetes, left ventricular hypertrophy and elevated hematocrit appeared to be important determinants of ischemic ocular motor nerve palsy. Additional studies should be undertaken to confirm these findings.
Jacobson
D M
DM
Department of Neurology, Marshfield Clinic, Wis.
McCanna
T D
TD
Layde
P M
PM
D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007511:Ischemia / Q000209:etiology*; D008297:Male; D008875:Middle Aged; D009802:Oculomotor Nerve / Q000098:blood supply*; D015840:Oculomotor Nerve Diseases / Q000209:etiology*; D016017:Odds Ratio; D009886:Ophthalmoplegia / Q000209:etiology; D015995:Prevalence; D012307:Risk Factors