Resp. Alkalosis pH> 7.45. PaCO2< 4.7kPa. Hyperventilation: low <PaCO2 causes vasoconstriction of cerebral blood vessels increasing neurological S&S.
Cause: anxiety induced hyperventilation, fever, hypoxia, gram- bacteraemia, mechanical ventilation.
Signs: dizziness, numbness & tingling, palpitations, dyspnoea, chest tightness, anxiety, tremors, seizures, LOC