Coma
Summary :
Table of Contents
- Introduction
- Examination and major diagnostic procedures
- Fever
- Asymmetry of muscle tone
- Respiration
- Pupils
- Eyelids and eye movements
- Tests
- The electroencephalogram
- Coma from supratentorial structural lesions
- Aqueductal obstruction
- The downward course of transtentorial herniation
- Coma from infratentorial structural lesions
- Coma from metabolic or diffuse brain disease
- Hysteria and catatonia
- Locked in syndrome
- Vegitative state
- Brain death
- Conclusion
- Bibliography
Abstract
Consciousness, the awareness of self and environment, requires both arousal and mental content; the anatomic substrate includes both reticular activating system and cerebral cortex. coma is a state of unconsciousness that differs from syncope in being sustained and from sleep in being less easily reversed. Cerebral oxygen uptake (cerebral metabolic rate of oxygen [CMRO2]) is normal in sleep or actually increases during the rapid eye movement stage, but CMRO2 is abnormally reduced in coma.
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