<prompt> Least A-V O2 difference is seen inHypoxic hypoxiaAnemic hypoxiaStagnant hypoxiaHistotoxic hypoxia  <response>: 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 