Which vitamin will reduce the therapeutic effects of levodopa?
B6
A
E
K
C
The Correct Answer is A
A. B6 (Pyridoxine):
Vitamin B6, also known as pyridoxine, is known to reduce the therapeutic effects of levodopa. It competes with levodopa for absorption in the gastrointestinal tract and can decrease the amount of levodopa that reaches the brain, thereby diminishing its effectiveness in treating Parkinson's disease symptoms.
B. A (Retinol):
Vitamin A, also known as retinol, is not typically associated with reducing the therapeutic effects of levodopa. Vitamin A plays important roles in vision, immune function, and cellular communication, but it does not interact with levodopa in a way that affects its therapeutic efficacy.
C. E (Alpha-Tocopherol):
Vitamin E, also known as alpha-tocopherol, is an antioxidant that plays a role in protecting cells from oxidative damage. While vitamin E supplementation is sometimes used in Parkinson's disease management for its potential neuroprotective effects, it is not known to reduce the therapeutic effects of levodopa.
D. K (Phylloquinone):
Vitamin K, also known as phylloquinone, is primarily involved in blood clotting and bone metabolism. It does not interact with levodopa in a way that reduces its therapeutic effects.
E. C (Ascorbic Acid):
Vitamin C, also known as ascorbic acid, is not known to reduce the therapeutic effects of levodopa. While vitamin C has various roles in the body, including antioxidant activity and immune function support, it does not interfere with levodopa absorption or efficacy.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Toes turning up and spreading:
This description corresponds to the abnormal finding in the Babinski reflex. In a positive Babinski sign, the big toe (hallux) dorsiflexes (turns upward) and the other toes fan out. This response is abnormal in adults but normal in infants up to a certain age.
B. Downward curl of the toes:
This response is typical of the normal plantar reflex, where the toes curl downward (plantar flexion) in response to stimulation of the sole of the foot. It is not indicative of the Babinski reflex.
C. Pain in the big toe:
Pain in the big toe is not a characteristic finding of the Babinski reflex. The Babinski sign is assessed by observing the movement pattern of the toes in response to stimulation, rather than eliciting pain.
D. Big toe bending upward:
The big toe bending upward, or dorsiflexion of the big toe, is a specific component of the positive Babinski sign. However, it is typically accompanied by spreading of the other toes, which is the hallmark feature of the Babinski reflex.
Correct Answer is C
Explanation
A. Extension of the extremities
Extension of the extremities is not consistent with decorticate posturing. Instead, it is more indicative of decerebrate posturing, where both the upper and lower extremities are typically extended.
B. Pronation of the hands
Pronation of the hands is not typically associated with decorticate posturing. In decorticate posturing, the hands are usually flexed with the wrists and fingers pointing towards the body.
C. Plantar flexion of the legs
Plantar flexion of the legs characteristic of decorticate posturing. Decorticate posturing mainly involves plantar flexion of the feet.
D. External rotation of the lower extremities
External rotation of the lower extremities is also not typically associated with decorticate posturing. In decorticate posturing, the lower extremities may exhibit extension or internal rotation, but external rotation is not a characteristic feature.
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