Vasodialation which as a result of loss of sympathetic tone of blood vessels.
· Spinal cord injury
· Spinal anesthesia
· Head injuries
· Nervous system disease
· Depressant action of drugs
Damage to the vasomotor centre in the medulla or from loss of impulse transmission
Without sympathetic nervous system impulses ,the blood vessels dilate, leading to massive peripheral vasodilation
Tissue hypoxia, impaired thermoregulation
Management: Placing the patient in trendelenberg position, Vasopressors.