Alpha stat measurement at constant 37C and is used more with

• A. Poikilotherm-body temperature change with environment
• B. Normotherm-body temperature
• C. It is performed at 37°C
• D. Hyperthermia

Answer: (A)

Alpha-stat ABG management uses a fixed reference of 37°C for interpreting acid-base status, regardless of the patient’s actual temperature. This means pH and CO2 are evaluated as if the body were at normal temperature, rather than temperature-corrected to the current state. This approach is favored when body temperature changes with the environment, i.e., a poikilotherm-like situation, because it avoids introducing temperature-driven swings in acid-base interpretation and cerebral blood flow. If we temperature-corrected the values (pH-stat) during variable temperatures, CO2 levels and pH could shift excessively with cooling or warming, potentially destabilizing cerebral perfusion. So alpha-stat is used more in contexts where body temperature follows environmental changes. The other options don’t capture this usage focus as precisely: while alpha-stat relies on a 37°C reference, normothermia is a broader condition not specifically about temperature variability, and hyperthermia describes a state rather than a management rationale.