Accidental venous and dural puncture during epidural analgesia in obese parturients (BMI > 40 kg/m2): three different body positions during insertion.

Study Objective: To assess the frequency of blood vessel punctures in morbidly obese parturients [body mass index (BMI) > 40 kg/m(2)] during epidural catheterization, in three different body positions.

Design: Prospective, randomized study.

Setting: Delivery room of a university-affiliated hospital.

Patients: 347 obese parturients (BMI > 40 kg/m(2)) undergoing continuous epidural analgesia during labor.

Interventions: Patients were randomized to undergo epidural catheterization in the sitting, lateral recumbent horizontal, or lateral recumbent head-down positions.

Measurements And Main Results: A lower frequency of epidural venous cannulation was noted when this procedure was performed in the lateral recumbent head-down position (4.8%) than in the lateral recumbent horizontal (11.6%) or sitting position (18.3%) (P = 0.001). Frequency of accidental subarachnoid puncture did not differ significantly (2.5%, 2.6%, and 3.7%), respectively.

Conclusion: Adoption of the lateral recumbent head-down position for the performance of lumbar epidural blockade in labor at term reduces the frequency of lumbar epidural venous puncture in obese parturients (BMI > 40 kg/m(2)).