Professional and Linguistic Assessments Board (PLAB) Practice Exam

In the context of the Glasgow Coma Scale, which response indicates decerebrate posturing?

1. Score of 1

2. Score of 3

3. Score of 2

4. Score of 6

The correct answer is: Score of 2

Decerebrate posturing is characterized by abnormal extension of the body and limbs. This type of posturing usually occurs when there is damage to the brainstem, typically due to severe brain injury. In the context of the Glasgow Coma Scale (GCS), motor responses are evaluated, and each response is given a score based on how the patient reacts to stimuli. A score of 2 specifically indicates a response of decerebrate posturing. This means that the patient is exhibiting rigid extension of the arms and legs, which is a critical sign of significant neurological impairment. Understanding this response is essential for healthcare professionals as it provides insight into the severity of the brain injury and can influence treatment decisions. Scores such as 1 represent no motor response, while higher scores indicate more purposeful motor responses or even normal function, such as obeying commands, which is not applicable in the case of decerebrate posturing. Recognizing decerebrate posturing as a part of the GCS scoring is crucial in evaluating a patient's level of consciousness and overall brain function.