Definition

1. Noun:
   • The irreversible cessation of all brain function, including the brainstem: A clinical and legal definition of death characterized by the complete and permanent loss of consciousness, absence of all brainstem reflexes (such as the ability to breathe), and unresponsiveness to all stimuli. Vital organ function may be maintained artificially for a time.

Usage

• As a subject: "Brain death is a medically and legally accepted criterion for death."
• As an object: "The team of doctors confirmed the diagnosis of brain death."
• With prepositions: "The patient was declared dead based on brain death."

Examples

• The hospital's protocol requires two independent neurological examinations to confirm brain death.
• After the accident, she was kept on life support until brain death was formally established.
• The concept of brain death is crucial for ethical organ donation practices.

Advanced Usage

• "to declare brain death": To make an official medical determination that brain death has occurred.
  • The neurologist had to declare brain death before any discussion of organ procurement could begin.
• "criteria/diagnosis of brain death": Refers to the specific medical tests and observations required for the determination.
  • The diagnosis of brain death followed a strict hospital protocol.

Variants and Related Words

• Brain-dead (adjective): Describing a person who has suffered brain death.
  • The patient was brain-dead for several hours before life support was withdrawn.
• Neurological death: A synonym often used in medical contexts.
• Cardiac death: A different criterion for death based on the irreversible cessation of circulatory and respiratory functions.

Synonyms

• Irreversible coma (though this is a less precise, older term).
• Neurological determination of death.

Related Phrases

• "Determination of brain death": The formal process of assessing and confirming brain death.
  • The determination of brain death involves tests for apnea and brainstem reflexes.
• "Brain death protocol": The set of standardized medical procedures for diagnosing brain death.
  • The hospital updated its brain death protocol to align with national guidelines.

Notes on Meaning

This term is specifically used in medical, legal, and ethical contexts. It is distinct from a vegetative state or coma, as those conditions may involve some residual brain function. The diagnosis of brain death signifies that recovery is impossible and that the individual is legally dead, even if the heart is still beating with mechanical assistance.

Noun

1. death when respiration and other reflexes are absent; consciousness is gone; organs can be removed for transplantation before the heartbeat stops