1 st stage : Increasing respiratory rate expiration is dominant (exhalation)
2 nd stage: Tachycardia Hypertension Contractions Hyporeflexions
3 rd stage: Slow, shallow, irregular breathing Tachycardia
4 th stage: Paralysis of the vagus nerve Tachycardia Hypotension Pupil dilation Muscle relaxation Respiration (breathing) stops with continuous heart beating The patient can be saved in this stage that lasts (3-4) minutes