Below-knee physiologic cryoanesthesia in the critically ill patient

Area of Science:

• Vascular Surgery
• Surgical Innovation
• Patient Outcomes

Background:

• Local hypothermia's role in preoperative amputation treatment remains controversial.
• Below-knee (BK) amputations are common procedures for severe lower extremity conditions.

Purpose of the Study:

• To evaluate the effectiveness of cryoanesthesia in reducing postoperative morbidity and mortality in below-knee amputations.
• To assess the impact of preoperative local hypothermia on patient outcomes in unstable surgical candidates.

Main Methods:

• A comparative study of 91 patients undergoing below-knee amputations due to unreconstructable vascular disease or gangrene.
• Group I: 48 patients underwent routine BK amputation.
• Group II: 43 acutely ill, unstable patients received amputation under cryoanesthesia prior to definitive surgery.

Main Results:

• Group II patients were significantly sicker preoperatively, with higher rates of comorbidities like diabetes, myocardial infarction, and stroke.
• Postoperative mortality rates were similar between groups (8% vs. 9%).
• Group II patients had a significantly shorter average hospital stay (17.7 days vs. 24.2 days) and slightly fewer postoperative complications.

Conclusions:

• Amputation under cryoanesthesia is valuable for acutely ill patients with unreconstructable vascular disease or gangrene.
• Preoperative local hypothermia can reduce postoperative morbidity, mortality, and length of hospital stay in high-risk patients.
• Cryoanesthesia offers a potential benefit for unstable patients requiring below-knee amputation.