Nokea
True statements about EOG (electro-oculogram) include:
- A. the EOG light-peak to dark-trough ratio is reduced in central retinal vein occlusion
- B. the light peak of EOG is abnormal in Best's disease
- C. the EOG light rise is produced by depolarization of the basal membrane of the retinal pigment epithelium
- D. all above
Correct Answer: D
Rationale: The EOG light-peak to dark-trough ratio is reduced in retinal vein occlusion, the light peak is abnormal in Best's disease, and the light rise is due to RPE depolarization. All statements are true.
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The muscular wasting (hypotrophy) usually develops with disease in:
- A. upper motor neuron
- B. lower motor neuron
- C. cerebellar
- D. caudate
Correct Answer: B
Rationale: Lower motor neuron is the correct answer because damage to these neurons directly affects the muscles they innervate, leading to atrophy, weakness, and loss of reflexes. This occurs due to the disruption of the neural connection between the spinal cord and the muscle, resulting in denervation and subsequent muscle wasting.
Apraxia involves an inability to undertake learned and purposeful activities such as dressing, cooking etc., and means that sufferers must rely increasingly on caregivers to help with these activities. Limb apraxia is a common symptom of left hemisphere damage and consists of a deficit in performing gestures to verbal command or imitation. One form of rehabilitation training for limb apraxia is:
- A. Gestural training.
- B. Mime training.
- C. Motor training.
- D. Replication training.
Correct Answer: A
Rationale: Gestural training is a rehabilitation technique used to improve limb apraxia, a condition characterized by difficulty in performing purposeful movements. This training involves teaching individuals to recognize and execute appropriate gestures and postures, enhancing their ability to perform daily activities. By focusing on the coordination of movements and the context in which they are used, gestural training helps individuals regain functional independence and reduce reliance on caregivers.
Which of the following is an enzyme that breaks down a neurotransmitter?
- A. acetylcholine
- B. serotonin
- C. dopamine
- D. acetylcholinesterase
Correct Answer: D
Rationale: Acetylcholinesterase is an enzyme that breaks down the neurotransmitter acetylcholine in the synaptic cleft. This breakdown is essential for terminating the signal and preventing continuous stimulation of the postsynaptic neuron. Acetylcholinesterase ensures that acetylcholine's effects are short-lived and precisely regulated, allowing for controlled neural communication. Dysfunction of this enzyme can lead to neurological disorders.
The first priority of care of the patient with a new fracture includes assessing
- A. Respiratory rate and effort, pulse.
- B. The fracture site for bleeding.
- C. For signs of infection at the wound site of an open fracture.
- D. For circulation and sensation distal to the fracture site.
Correct Answer: D
Rationale: Assessing circulation and sensation ensures no neurovascular compromise has occurred due to the fracture.
The nurse is assisting as a neurosurgeon examines a patient who has a positive Babinski reflex. What assessment finding should the nurse expect to observe?
- A. The leg flexes when the patellar tendon is struck.
- B. The leg extends when the patellar tendon is struck.
- C. The big toe extends when the sole of the foot is stroked.
- D. Toes curl downward when the sole of the foot is stroked.
Correct Answer: C
Rationale: A positive Babinski reflex, indicative of neurological dysfunction, involves extension of the big toe and fanning of the other toes when the sole of the foot is stroked. Flexion or extension of the leg is associated with other reflexes. Recognizing a positive Babinski reflex is important for assessing upper motor neuron lesions.