Relationship between Bell's Palsy and Previous Statin Use: A Case/Non-Case Study

Area of Science:

• Epidemiology
• Neurology
• Pharmacology

Background:

• Bell's palsy is a common neurological disorder affecting facial nerves.
• Statins are widely prescribed cholesterol-lowering drugs.
• The potential association between statin use and Bell's palsy requires investigation.

Purpose of the Study:

• To investigate the relationship between previous statin use and the incidence of Bell's palsy.
• To analyze statin prescription patterns in relation to Bell's palsy onset.
• To explore potential confounding factors in this association.

Main Methods:

• Retrospective cohort study using Korean National Health Insurance Service data (2002-2015).
• Matched case-control analysis comparing Bell's palsy patients (n=3203) with controls (n=12,812).
• Conditional logistic regression analysis of statin use days in the 2 years preceding Bell's palsy onset, with subgroup analyses.

Main Results:

• The Bell's palsy group showed higher previous statin use (84.6 days vs. 74.4 days, p=0.009).
• A crude association between statin use and Bell's palsy was observed (OR 1.03-1.19, p=0.006).
• This association disappeared after adjusting for covariates, with no subgroup showing increased odds.

Conclusions:

• No significant association was found between previous statin use and Bell's palsy in Korean adults aged 40 and above.
• Adjusting for confounding factors negated the initial observed crude association.
• Further research may be warranted to explore other potential risk factors for Bell's palsy.