You are caring for a patient who has no cognitive functioning but only basic human functions such as opening the eyes and the sleep-wake cycle. What level of consciousness does this patient have?
Correct Answer: B
Rationale: A persistent vegetative state is characterized by the absence of cognitive functioning while basic human functions like the sleep-wake cycle are retained. In this state, the patient shows reflex movements and basic responses to stimuli but lacks awareness or higher mental functions. Choices A, C, and D are incorrect because:
A) Obtunded refers to a decreased level of consciousness, not the absence of cognitive functioning.
C) Locked-in syndrome is a condition where the patient is aware and awake but cannot move or communicate due to complete paralysis of nearly all voluntary muscles except for vertical eye movements and blinking.
D) Brain death is the irreversible cessation of all brain activity, including the brainstem, leading to the loss of all functions of the brain.