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Effectiveness of Topical Lidocaine-Prilocaine Cream for Pain Control During Femoral Artery Catheterization in Adult Patients: A Prospective Study.

Objective
To test the effectiveness of topical EMLA cream (lidocaine 2.5% and prilocaine 2.5%) for pain control during femoral artery catheterization for neuro-endovascular procedures in adult patients.


Methods
The body habitus overlying the femoral arterial pulsation was graded as: (1) pubic symphysis and iliac crest bone protuberances visualized; (2) Pubic Symphysis and Iliac Crest bone protuberances not seen but easily palpable; (3) Pubic Symphysis and Iliac Crest bone protuberances palpable with considerable difficulty; and (4) abdominal layers fold over the femoral region. The severity of pain at femoral artery catheterization was classified using a numeric rating scale score ranging from 0 (no pain) to 10 (worst pain). The primary endpoints were the proportion of patients with excellent (score of ≤1) and failed pain control (score of ≥8).


Results
The mean (±SD) and median numeric rating scale scores were 2.4 ± 2.7 and 1, respectively, in 186 patients included. The proportion of patients with excellent pain control was 49.4% [95% confidence interval (CI) 42.1%-56.7%] and failed pain control was 6.9% (95% CI 4.1%-11.6%). The body habitus was graded as 1 (n = 31), 2 (n = 61), 3 (n = 48), and 4 (n = 46). In multivariate analysis, grade 4 body habitus [odds ratio (OR) 1.8; 95% CI 1.3-2.9], grade 4 ease of cannulation (OR 2.1; 95% CI 1.2-2.7), and previous femoral artery catheterization (OR 2.5; 95% CI 1.8-4.2) were independent predictors of failed pain control. Grade 1 ease of cannulation (OR 1.6; 95% CI 1.2-3.1) independently predicted excellent pain control.


Conclusion
Topical EMLA cream as an adjunct to local lidocaine infiltration was associated with very low rates of failed pain control during femoral artery catheterization despite a relatively high rate of unfavorable body habitus.