Sensory changes with prolonged double-cuff tourniquet time in hand surgery.

This study evaluates the sensory changes that occur in the operated hand after the use of the double-cuff tourniquet technique for up to 4 hours. Thirty patients whose hand operations lasted more than 2 hours were evaluated. Tourniquet time ranged between 2 hours and 4 hours, 17 minutes. Light touch, von Frey's aesthesiometry, vibratory sensation, and two-point discrimination were examined. Subjective overall sensation and postoperative edema were also assessed. Patients were evaluated the evening before operation, on the second postoperative day, and at every out-patient follow-up visit, until all examined parameters returned to normal. Of the patients 73% demonstrated clinically normal sensibility test results within 23 days after operation. In 80% of all patients, subjective sensibility of the operated hand was equal to the nonoperated hand within 1 week of operation. Ultimately, all patients (96%) but one, demonstrated normal sensibility test results and normal subjective sensibility. Postoperative edema developed in 53% of the patients; it subsided in less than 4 weeks. The double-cuff technique can prolong tourniquet time safely for up to 4 hours.