The semi-sitting position, also known as the Beach Chair position, is a positioning technique used for approaches to the posterior cranial fossa or cervical spine.
Positioning
In the semi-sitting position, the patient is placed in a semi-sitting position with the head secured in a Mayfield head clamp. The semi-sitting position results in a significant reduction in mean arterial blood pressure and cardiac output in patients[^1] [^2].
Use
The semi-sitting position can be used, for example, for the resection of Pineal cysts [^3] or Vestibular schwannomas[^4].