Neuro anaesthesia--a review of the basic principles and current practices

Area of Science:

• Neuroanesthesia
• Intracranial Pressure Dynamics
• Cerebral Physiology

Background:

• The Monro-Kellie doctrine explains how intracranial pressure responds to volume changes within the skull.
• Cerebral blood flow and cerebral arterial volume significantly impact intracranial dynamics.
• Understanding cerebral perfusion pressure is crucial for neuroanesthetic procedures.

Purpose of the Study:

• To review the physiological factors affecting intracranial pressure and cerebral perfusion pressure.
• To discuss the impact of anesthetic agents on intracranial dynamics.
• To examine recent controversies in neuroanesthetic techniques.

Main Methods:

• Review of existing literature on intracranial pressure and anesthetic agents.
• Discussion of physiological principles governing cerebral blood flow and perfusion.
• Analysis of the effects of volatile agents, propofol, and other drugs.

Main Results:

• Hypercapnia with volatile agents can cause dangerous increases in intracranial pressure and decreases in cerebral perfusion pressure.
• Isoflurane may offer advantages but has complications; nitrous oxide can also affect intracranial pressure.
• The use of propofol infusions, neuromuscular blockers, and narcotics are discussed.

Conclusions:

• Careful management of ventilation and anesthetic agents is critical in neuroanesthesia.
• The role of induced hypotension and vasospasm treatment requires ongoing evaluation.
• Anesthetic choices must balance efficacy with potential intracranial complications.