“…During the night, decreased oxygenation (Hb saturation, measured by pulse oximetry, was 95-100% at inspired oxygen fraction of 0.30-0.60, and decreased to 82-88% at 0.21) and hypoventilation Anesthesia for a myasthenic cat Y Shilo et al (venous CO 2 partial pressures, PvCO 2 , of 47-97 mmHg) were observed. Venous blood gas analysis was used to assess ventilation status, as it has been shown to correlate with arterial blood gases in humans and dogs, and thus provide clinically acceptable substitutes of arterial samples in hemodynamically stable animals (Chu et al 2003;Pang et al 2009;Treger et al 2010). When the PvCO 2 reached 97 mmHg (end-tidal CO 2 62 mmHg), the depth of anesthesia was deemed excessively deep.…”