Mild (35 C to 32.3 C):
--Mild CNS depression with impaired judgement, dysarthria, maladaptive behavior
--Tachycardia replaced by bradycardia, increased cardiac output
--Tachypnea, bronchorrhea, bronchospasm
--Increased metabolic activity with shivering
--Ataxia

Moderate (32.2 C to 28 C):
--EEG abnormalities, depressed consciousness, pupillary dilatation, paradoxical undressing, hallucinations
--Decreased pulse and cardiac output, increased atrial and ventricular arrythmia, prolonged systole
--Hypoventilation, loss of protective airway reflexes, profoundly decreased oxygen consumption
--Increased renal blood flow with renal autoregulatory activity intact, no insulin activity
--Hyporeflexia
--Rigidity

Severe (<28 C):
--Loss of cerebrovascular autoregulation, coma, loss of ocular reflexes
--Progressive decreases in blood pressure, heart rate and cardiac output
--Reentrant dysrhythmia, lowered fibrillation threshold, asystole
--Pulmonic congestion and edema, apnea
--Oliguria with decreased renal blood flow, profound decrease in basal metabolism
--Decreased nerve-conduction velocity
--Peripheral areflexia