<prompt> A lady after undergoing surgery under general anaesthesia with no intra surgical complication complained of respiratory difficulty. Po2 low. Not able to lift her head and leg. what can be the causeProlonger action of muscle relaxantRespiratory acidosisPulmonary embolismFentanyl chest rigidity  <response>: This is a case of inadequate reversal from neuromuscular blocker. Residual paralysis Can occur after general Anaesthesia CF - Patient conscious , unable to breathe adequate tidal volume , motor weakness, desaturation Mn- suppo the ventilation 