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Minimizing tourniquet pressure in pediatric anterior cruciate ligament reconstructive surgery: a blinded, prospective
Christopher W Reilly1, James A McEwen, Lise Leveille
1Department of Orthopaedics, , University of British Columbia, Vancouver, British Columbia, Canada.
Insights
Measuring limb occlusion pressure (LOP) with wide contour cuffs significantly lowers tourniquet pressures in pediatric surgery. This method ensures a safe and effective bloodless field without compromising surgical quality in children.
Area of Science:
- Orthopedic Surgery
- Pediatric Anesthesiology
- Medical Device Technology
Background:
- Standard tourniquet cuff pressures in pediatric patients lack evidence for optimal safety and efficacy.
- Adult studies suggest limb occlusion pressure (LOP) measurement and wide contour cuffs improve tourniquet application.
- Limited data exists on applying these advanced tourniquet techniques in pediatric populations.
Purpose of the Study:
- To evaluate the effectiveness of measured limb occlusion pressure (LOP) with wide contour cuffs in pediatric patients undergoing anterior cruciate ligament repair.
- To compare tourniquet cuff pressures achieved using LOP measurement versus standard pressures in a pediatric cohort.
- To assess the impact of LOP-guided tourniquet pressures on surgical field quality in children.
Main Methods:
- A prospective randomized controlled trial involving pediatric patients (10-17 years) undergoing anterior cruciate ligament repair.
- Patients were randomized into a control group (300 mm Hg standard pressure) or an experimental LOP group (pressure based on LOP measurement).
- Surgeons were blinded to cuff selection and pressure; surgical field quality was rated post-procedure using a visual analog scale.
Main Results:
- A statistically significant difference was observed in mean cuff pressure between the control (300 mm Hg) and LOP groups (151 mm Hg) (P < 0.001).
- The quality of the surgical bloodless field was comparable between the LOP group and the control group (P = 0.053).
- Results remained significant when comparing LOP data to a hypothetical control pressure of 250 mm Hg (P < 0.001).
Conclusions:
- Automatic LOP measurement combined with wide contour cuffs significantly reduces tourniquet cuff pressures in pediatric patients.
- This approach achieves lower pressures compared to standard practices (300 or 250 mm Hg) without negatively impacting surgical field quality.
- The findings support the use of LOP-guided tourniquet systems for safer and more effective pediatric surgical procedures.
Background:
Tourniquet cuff pressures in pediatric patients are commonly set at standard pressures. Recent evidence on adult subjects has shown that safer and more effective cuff pressures can be achieved by measuring limb occlusion pressure (LOP) and using a wide contour cuff. There is little evidence validating these techniques in children. The primary objective of this study was to evaluate if a difference in tourniquet cuff pressure can be achieved in a pediatric population using a wide contour cuff in conjunction with measured LOP when compared with a standard cuff and pressure.
Methods:
Subjects aged 10 to 17 years that underwent anterior cruciate ligament repair were included and randomized into either the control group or the experimental LOP group using variable block randomization. The tourniquet cuff was inflated to 300 mm Hg in the control group or to the recommended tourniquet pressure based on LOP measurement in the LOP group. The surgeon was blinded to cuff selection, application, and pressure throughout the surgical procedure. Immediately after the surgical procedure, the surgeon rated the quality of the bloodless field on a visual analog scale. This study was powered as an effectiveness trial, and intention to treat analysis was used.
Results:
After a planned interim analysis at midpoint, complete data were recorded for 11 (control group) and 10 (LOP group) patients. The quality of the surgical field was not different between the groups (P = 0.053). There was a statistically significant difference in the mean cuff pressure between the control (300 mm Hg) and the LOP (151 mm Hg) groups (P < 0.001). We ran the same analysis comparing the LOP data with the hypothetical control data of 250 mm Hg, and our results remained statistically significant (P < 0.001).
Conclusions:
The use of an automatic LOP measurement with the use of wide contour cuffs can significantly reduce mean tourniquet cuff pressures in pediatric patients compared with the typical practice of 300 or 250 mm Hg without compromising the quality of the surgical field.
Level Of Evidence:
Level 1, prospective randomized controlled trial.