Surgical positioning lowered skull pressure, with blood-supply pressure still uncertain
During brain surgery, a head-up tilt lowered pressure inside the skull compared with neutral positioning. Pressure supplying the brain showed no statistically clear difference.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
In surgical patients, the pooled head-up positioning comparison showed lower pressure inside the skull and lower mean arterial blood pressure. The pressure supplying the brain did not show a statistically clear difference, but its confidence interval allowed changes in either direction. These measurements concern operating conditions and do not establish better recovery or fewer complications.
Only the highlighted tilt angle had enough studies for pooling. The abstract does not establish the best angle or report patient recovery outcomes.
What researchers found
Cerebral perfusion pressure
During surgery, 10° tilt versus neutral: mean difference -0.52 mmHg, 95% confidence interval -4.30 to 3.27 mmHg; p = 0.79.
Several pressures were measured
Reverse Trendelenburg is a head-up body tilt. The review distinguished pressure inside the skull, arterial blood pressure, and cerebral perfusion pressure—the pressure supplying the brain—rather than treating a decrease in any pressure as the same outcome.
Why unchanged needs caution
The authors described cerebral perfusion pressure as unchanged. More cautiously, the estimate did not distinguish a difference from zero, and its uncertainty included both lower and higher values. That result does not demonstrate equivalence between positions.
The original publication
The effects of reverse trendelemburg position during intracranial neurosurgery on brain hydrodynamics and hemodynamics: a systematic review and meta-analysis.
Ramos MB, Britz JPE, Rech MM et al.
Neurosurg Rev · 2025
- PubMed ID
- 40484864
- Record checked
AI-assisted research and writing. This explains one selected publication; it is not a complete review of everything known. Our approach.
One more question, understood.
Keep track of the research you’ve explored.