Hospitals & Services
Shivering may occur in the post-op re-warming phase particularly after high dose Fentanyl anaesthesia. It is potentially harmful in severe cases as shivering will increase peripheral oxygen consumption and will generate CO2 production thereby increasing acidosis.
Often when the patient first begins to emerge from sedation (may not even appear to be awake at this point) the increase in intrathoracic pressure may be enough to cause this phenomenon.
This situation may mimic acute low output state caused by cardiac tamponade
Sleep inducing agents