Neuroanesthesia

Question 1

CBF

Answer 1

50 ml/100g/min

Metabolic rate temperature PaCo2 PaO2 (60-200mmHg) if low CBF augmented

In hypotension the responsiveness to CO2 is abolished (25-75mmHg) is proportional

Question 2

Autonomic hyperreflexia

Answer 2

Begins 2-3 weeks post acute injury
Occurs with stimulation below injury level
Leading to uninhibited sympathetic stimulation
85% occur with level injury above T5

Question 3

Neurogenic shock

Answer 3

Unopposed parasympathetic stimulation
Bradycardia
Hypotension
Loss of cardioaccelerator fiber T1-T4

Atropine epinephrine pacing

Diaphragm compromise up to C3

Question 4

Cushing reflex

Answer 4

Hypertension activation of SNS
Bradycardia reflex
Irregular respiration ( ischemia in respiratory centers)

Question 5

Cornea reflex

Answer 5

The corneal reflex involves the ophthalmic branch of the trigeminal nerve (afferent limb) and the temporal and zygomatic branches of the facial nerve.