<prompt> True about Carbon monoxide poisoning:CO has 100 times more affinity than 02 for HbCause right side shifting of 02 dissociation curveOxygen-haemoglobin saturation curve becomes hyperbolic shapePulse oximetry can accurately detect level of CO  <response>: Ans: c. Orygen-haemoglobin saturation saturation Curve Becomes Hyperbolic ShapeRef Ganong 25th650-51; Guyton 12th352; A K Jain 6th 431; httpstpedclerk. bsd. uchicago. edupage www. nebi. Nlm. nih. govCarbon-monoxide-poisoning:Carbon monoxide shifts the oxygen-haemoglobin saturation curve to the left and changes it to a more hyperbolic shape.Less oxygen is available for the tissues.plasma level of carboxyhemoglobin is normally quite low.At baseline, levels up to 3 percent ,nay be seen in nonsmokers, while smokers may have levels up to 10-15 percent.Left shift of O2-Hb dissociation curve occur in - CO poisoning HbF, myoglobin eb decrease in body temperature.CO has about 240 times the affinity of O2for Hb; this means that CO will combine with the same amount of Hb as 02 when the CO paial pressure is 240 times lower. 