Effect of Cryoanalgesia Combined with Intravenous Continuous Analgesia in Thoracotomy Patients

Fifty patients undergoing thoracotomy was studied to compare the effects of cryoanalgesia combined with intravenous continuous analgesia (IVCA). Patients were randomized into two groups: IVCA group and IVCA-cryo group. Subjective pain intensity was assessed on a visual analogue scale at rest (VAS-R) and during movement (VAS-M). Analgesic requirements were evaluated over the 7 days following surgery. Forced vital capacity (FVC) and forced expiratory volume in 1 sec (FEV(1)) were measured before operation, on the 2nd and 7th postoperative days (POD). We interviewed patients by telephone to evaluate the prevalence of post-thoracotomy pain at the 1st, 3rd, and 6th months postoperatively. No significant differences were observed between the two groups with respect to postoperative pain, analgesic requirements, side effects, respiratory complications, or prevalence of post-thoracotomy pain. However, a significant increase in FVC and FEV(1) was observed on the 7th POD in IVCAc-ryo group. The incidence of the post-thoracotomy pain at the 1st, 3rd, and 6th months postoperatively was 68, 60, and 44% in IVCA group, and 88, 68, and 28% in IVCA-cryo group, respectively. Our study showed that cryoanalgesia combined with IVCA effectively restore respiratory function on 7th POD, but that it was not effective at reducing the incidence of post-thoracotomy pain.