PbtO2
Pronunciation: P-B-T-O-two
Brain tissue partial pressure of oxygen; a neuromonitoring parameter measuring cerebral oxygenation.
Full Definition
Brain tissue partial pressure of oxygen (PbtO2) is a direct measurement of oxygen tension in brain parenchyma, typically obtained through an invasive probe placed in white matter. Normal values range from 20-40 mmHg, with levels below 15 mmHg indicating cerebral hypoxia and potential tissue injury. PbtO2 monitoring is used in neurocritical care to guide therapeutic interventions and optimize cerebral oxygen delivery. Clinical editors must distinguish this measurement from other oxygenation parameters and ensure proper units (mmHg) are specified in documentation.
Usage
Usage note: Always include units (mmHg). Do not confuse with jugular venous oxygen saturation or arterial-venous oxygen difference.
In Context
- "PbtO2 values remained below 15 mmHg despite optimization of CPP and ventilation parameters." — neurocritical care progress note
- "Multimodal monitoring included ICP, CPP, and PbtO2 to guide therapeutic decision-making." — intensive care unit note