Least (A-V )O2 difference is seen in: (A) Hypoxic hypoxia, (B) Anemic hypoxia, (C) Stagnant hypoxia, (D) Histotoxic hypoxia
Answer is D. Histotoxic hypoxia Cause Decreased ability of cell to use O2 Examples Cyanide poisoning PaO2 Normal Hb content Normal Aerial O2 content or %O2 saturation Normal A-V PO2 difference Decreased Peripheral chemoreceptor stimulation Present (toxin prevents chemoreceptor to use oxygen) Cyanosis Present