Distal blood pressure measurement in lower-limb amputees

Area of Science:

• Vascular Surgery
• Amputation Outcomes
• Peripheral Vascular Disease

Background:

• Below-knee amputation is a common surgical procedure for severe limb ischemia.
• Failure of below-knee amputation often necessitates a higher level of amputation.
• Distal blood pressure is a critical indicator of limb perfusion and healing potential.

Purpose of the Study:

• To investigate the relationship between distal blood pressure and the success rate of below-knee amputations.
• To determine the threshold of distal blood pressure predictive of reamputation above the knee.

Main Methods:

• Retrospective analysis of patients undergoing primary below-knee amputation.
• Measurement of distal blood pressure (mmHg) prior to amputation.
• Correlation of blood pressure values with the requirement for subsequent above-knee reamputation.

Main Results:

• A significant correlation was observed between distal blood pressure and reamputation rates.
• At 20 mmHg, two-thirds of below-knee amputations required reamputation above the knee.
• At 30 mmHg, one-third required reamputation, and at 40 mmHg, only one-seventh required reamputation.

Conclusions:

• Distal blood pressure is a key predictor of below-knee amputation success.
• Pre-operative distal blood pressure measurement can help stratify risk for reamputation.
• Optimizing perfusion and considering higher amputation levels may be necessary for pressures below 40 mmHg.