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Ann Intern Med. 2014 Mar 4;160(5):301-10. doi: 10.7326/M13-1921.

N-of-1 (single-patient) trials for statin-related myalgia.

Abstract

BACKGROUND:

Statin-related myalgia is difficult to distinguish from other conditions causing myalgia and may often lead to statin discontinuation.

OBJECTIVE:

To compare the effect of statin rechallenge with placebo in patients with prior statin-related myalgia and to determine whether patients resumed statin therapy after evaluating the results.

DESIGN:

N-of-1 trial with 3 double-blind, crossover comparisons separated by 3-week washout periods. (Clinicaltrials.gov: NCT01259791) SETTING: Tertiary care lipid clinic.

PATIENTS:

Patients with prior statin-related myalgia with or without mild elevation of creatine kinase levels.

INTERVENTION:

Rechallenge with the statin that was previously associated with myalgia within 3 weeks of open-label use versus matching placebo.

MEASUREMENTS:

Weekly visual analogue scale (VAS) scores for myalgia and specific symptoms (VAS myalgia score and symptom-specific VAS score, respectively), pain interference scores, and pain severity scores were recorded during the 3-week periods when patients were receiving placebo or statin. The primary outcome was the VAS myalgia score (range, 0 to 100 mm).

RESULTS:

Eight patients (mean age, 66 years [SD, 8 years]; 88% women, all with high 10-year Framingham cardiovascular risk) participated in n-of-1 trials. Seven patients completed 3 treatment pairs, and 1 completed 2 treatment pairs. For each n-of-1 trial, no statistically significant differences were seen between statin and placebo in the VAS myalgia score, symptom-specific VAS score, pain interference score, and pain severity score. Five patients resumed open-label statin treatment, with a median posttrial follow-up of 10 months.

LIMITATION:

Results are limited by the small sample size and cannot be extended to patients with longer onset of myalgia after statin initiation.

CONCLUSION:

In selected patients with a history of statin-related myalgia whose symptoms are difficult to evaluate, n-of-1 trials may be a useful method for determining statin tolerability.

PRIMARY FUNDING SOURCE:

Western University, London, Ontario, Canada.

PMID:
24737272
DOI:
10.7326/M13-1921
[Indexed for MEDLINE]

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