Steep Trendelenburg Positioning for Robotic Prostatectomy in a Morbidly Obese Patient
Mr. L is a 61-year-old man with a BMI of 41 and ASA physical status 3, scheduled for robot-assisted radical prostatectomy. He has obstructive sleep apnea, hypertension, type 2 diabetes with peripheral neuropathy, and a prior right total shoulder replacement. The planned position is steep Trendelenburg at 35 degrees for an estimated 4 hours, with both arms tucked at his sides. The OR table has a gel mattress but no specialized positioning system, and the surgeon has asked for shoulder braces to prevent sliding. The room is cooled to 18 degrees Celsius, or 65 degrees Fahrenheit. The anesthesia team plans general anesthesia with a standard endotracheal tube. You are the RNFA and are responsible for coordinating positioning with the circulator and anesthesia.
1. Identify the positioning risks and specify the interventions you would use.
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Steep Trendelenburg plus obesity creates sliding, nerve, eye, and pressure risks. I would use a non-slip mattress or moldable positioner, place the patient so the shoulders are not bearing weight on braces, and use padded shoulder supports only if needed with the force distributed over a broad area. Tuck the arms with palms facing the body, elbows padded, wrists neutral, and no pressure in the axilla. Avoid hyperextension. Place the head neutral with eyes taped and lubricated, and secure the endotracheal tube with enough slack to prevent extubation when the table tilts. Pad all bony prominences, especially the heels, sacrum, elbows, and occiput. Keep linens dry and the room warm enough to prevent hypothermia. Confirm the safety strap and that the patient cannot slide cephalad. The prior shoulder replacement means the right arm needs extra padding and limited abduction.
2. What monitoring and reassessment should occur during the case?
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Reassess at least every 15 to 30 minutes and after any table movement. Check skin over pressure points, pulses and capillary refill in both arms, hand color and temperature, and whether the arms have slipped. Confirm the eyes remain taped and the tube is secure. Watch for facial edema, rising airway pressures, and decreasing SpO2. Monitor urine output, blood pressure, and temperature. Communicate with anesthesia if the patient appears to be sliding, if the arms are under tension, or if airway pressures rise. If the case exceeds the estimated time, ask the surgeon whether the table can be briefly returned toward neutral to reduce nerve and eye risk. Documentation should include the position, degree of Trendelenburg, padding used, arm position, times of reassessment, and any changes.
3. What will you include in the handoff and documentation?
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Handoff to the PACU should include the position, degrees of Trendelenburg, total time, padding and supports used, arm position, eye protection, any intraoperative adjustments, and skin or neurovascular concerns. I would specifically report the prior right shoulder replacement and the risk of brachial plexus or ulnar neuropathy. The PACU should perform neurovascular checks of both hands and document skin integrity at pressure points. In the OR record, I would document the positioning devices, the fact that shoulder braces were avoided or padded, and the reassessment intervals. If there was any redness, numbness, or weakness, I would describe it objectively and notify the surgeon. Accurate documentation protects the patient and provides the data needed if a positioning injury is later alleged.