Pressure ulcers are caused by:

Necrosis.

Low capillary pressure.

Increased mobility.

Extrinsic factors.

Answer and Explanation

The Correct Answer is D

Choice A rationale

Necrosis is tissue death resulting from prolonged pressure, often a consequence rather than the direct cause of pressure ulcers. The primary cause is sustained pressure impairing blood flow.

Choice B rationale

Low capillary pressure does not directly cause pressure ulcers. They result from sustained external pressure exceeding capillary perfusion pressure, leading to ischemia and tissue damage.

Choice C rationale

Increased mobility actually prevents pressure ulcers by reducing sustained pressure on any one area, enhancing blood flow and tissue health. Immobility is a significant risk factor, not increased mobility.

Choice D rationale

Extrinsic factors like sustained pressure, friction, shear, and moisture contribute directly to pressure ulcer development by compromising skin integrity and blood flow, leading to tissue ischemia and damage.

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Correct Answer is B

Explanation

Choice A rationale

The dura mater is the outermost, tough, and fibrous layer of the meninges that provides protection to the brain and spinal cord.

Choice B rationale

Meninges collectively refer to the three layers of protective membranes (dura mater, arachnoid mater, and pia mater) that cover the brain and spinal cord.

Choice C rationale

The pia mater is the delicate innermost layer of the meninges that closely envelopes the brain and spinal cord, providing support and nourishment.

Choice D rationale

The arachnoid mater is the middle layer of the meninges that has a web-like appearance and provides cushioning for the brain and spinal cord.

A. Dysfunction in the cerebrum. B. Dysfunction in the brain stem. C. Dysfunction in the spinal column. D. Dysfunction in the motor cortex.

Correct Answer is B

Explanation

Choice A rationale

Dysfunction in the cerebrum would likely result in different types of posturing, such as decorticate posturing, rather than decerebrate. The cerebrum is involved in controlling voluntary motor functions and damage here typically does not lead to decerebrate posturing.

Choice B rationale

Dysfunction in the brain stem results in decerebrate posturing, characterized by rigid extension of the arms and legs, downward pointing of the toes, and backward arching of the head. The brain stem is crucial for controlling basic life functions and its impairment leads to severe motor response issues.

Choice C rationale

Dysfunction in the spinal column typically does not lead to decerebrate posturing but may lead to different types of paralysis or movement issues depending on the location and severity of the damage.

Choice D rationale

Dysfunction in the motor cortex usually leads to abnormalities in voluntary movement, muscle tone, and coordination rather than decerebrate posturing which is more linked to brain stem issues.

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Pressure ulcers are caused by:

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Naxlex Comprehensive Predictor Exams

Which term describes the fibrous connective tissues that cover the brain and spinal cord?

Correct Answer is B

Explanation

A nurse observes that decerebrate posturing is a comatose client's response to painful stimuli. Decerebrate posturing as a response to pain indicates:

Correct Answer is B

Explanation

An older adult client has come to the clinic for a regular check-up. The nurse's initial inspection reveals an increased thoracic curvature of the client's spine. The nurse should document the spinal disorder as which of the following?

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A client has difficulty interpreting their awareness of body position in space. Which lobe is most likely to be damaged?

Pressure ulcers are caused by:

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