Trendelenburg Positioning Did Not Cause the DVT
Based on the highest quality evidence, Trendelenburg positioning during laparoscopic myomectomy is unlikely to have contributed to the patient's deep vein thrombosis and may have actually been protective compared to other positions. 1
Evidence Against Trendelenburg as a Risk Factor
The most recent and robust study examining this specific question analyzed 374,017 laparoscopic procedures and found that Trendelenburg positioning was associated with the LOWEST risk of VTE (0.25%) compared to supine (0.23%) and reverse-Trendelenburg (0.4%) 1. After adjusting for confounders, reverse-Trendelenburg position actually had significantly higher VTE risk compared to Trendelenburg (OR 1.34,95% CI 1.15-1.56).
A 2022 systematic review and meta-analysis specifically examining steep Trendelenburg in robot-assisted pelvic surgery found no increased risk of VTE, cardiac, or cerebrovascular complications compared to laparoscopic or open surgery 2. This directly contradicts the theoretical concern about Trendelenburg positioning.
What Actually Matters for VTE Risk
The evidence points to these factors as the true contributors:
Surgical Factors
- Operative time: Procedures >106 minutes have 3.5-fold increased VTE risk compared to ≤40 minutes 1
- Inpatient vs outpatient status: Inpatient procedures carry 2.5-fold higher VTE risk 1
- Surgical approach: Laparoscopic myomectomy has significantly LOWER VTE risk (0.2%) compared to open surgery (0.7% for hysterectomy) 3
Patient-Specific Risk Assessment
Guidelines emphasize using validated risk stratification tools 4, 5. For gynecologic surgery without cancer, the baseline VTE risk is already low (0.2% for myomectomy) 3.
Common Pitfall to Avoid
Do not attribute DVT to positioning when other established risk factors are present. The physiologic concerns about pneumoperitoneum and positioning have not translated into clinical risk in multiple studies 6, 7, 2. Instead, focus on:
- Duration of surgery
- Patient mobility status
- Adequacy of thromboprophylaxis
- Presence of occult risk factors (thrombophilia, recent immobility, etc.)
Clinical Bottom Line
If this patient developed DVT after laparoscopic myomectomy in Trendelenburg position despite "lack of other risk factors," you should investigate for unrecognized risk factors rather than blaming the positioning. Consider occult thrombophilia, inadequate prophylaxis duration, prolonged operative time, or extended postoperative immobility as more likely culprits.