Can i dye my hair before knee surgery

The effect of hair colour on anaesthetic requirements and recovery time after surgery

P S Myles et al. Anaesth Intensive Care. 2012 Jul.

Free article

Abstract

Patients with red hair are much more likely to have a variant of the melanocortin-1 receptor gene and this may affect sensitivity to general anaesthetics and pain response. We did a prospective, matched cohort study of 468 healthy adult patients undergoing general anaesthesia for elective surgery. All patients received an inhalational general anaesthetic. Anaesthetic drugs and doses used, hypnotic depth, recovery times, pain scores and quality of recovery scores were recorded. More men than women had red hair, so we did subgroup and multivariable analyses to account for this imbalance. There was no significant difference in recovery times, pain scores or quality of recovery scores in those with red hair. After adjusting for age, sex, American Society of Anesthesiologists physical status and duration of surgery, the recovery ratio for time to eye-opening in redheads was comparable to those with black or brown hair, 0.82 (0.57-1.19), P=0.30. We found no evidence that patient hair colour affects anaesthetic requirements or recovery characteristics in a broad range of surgical procedures.

Comment in

• Confound those damned confounders.

  Sleigh JW. Sleigh JW. Anaesth Intensive Care. 2012 Jul;40(4):593-4. doi: 10.1177/0310057X1204000402. Anaesth Intensive Care. 2012. PMID: 22813484 No abstract available.

• Redheads and anaesthesia.

  Mitchell JA. Mitchell JA. Anaesth Intensive Care. 2013 Jan;41(1):124; author reply 124-5. Anaesth Intensive Care. 2013. PMID: 23362906 No abstract available.

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