The parents of a 3-year-old boy have brought him to a pediatrician for assessment of the boy's late ambulation and frequent falls.
Subsequent muscle biopsy has confirmed a diagnosis of Duchenne muscular dystrophy. Which of the following teaching points should the physician include when explaining the child's diagnosis to his parents?
A)
Your son's muscular dystrophy is a result of faulty connections between muscles and the nerves that normally control them.
B)
He'll require intensive physical therapy as he grows up, and there's a good chance that he will outgrow this problem as he develops.
C)
Your son will be prone to heart problems and decreased lung function because of this.
D)
His muscles will weaken and will visibly decrease in size relative to his body size throughout his childhood.
Question 2
When educating a patient about to undergo a pacemaker insertion, the nurse explains the normal phases of cardiac muscle tissue. During the repolarization phase, the nurse will stress that membranes must be repolarized before they can be reexcited.
Within the cell, the nurse understands that
A)
potassium channels open while sodium channels close, causing repolarization to the resting state.
B)
the influx of calcium is the primary stimulus for the repolarization of cardiac tissue.
C)
only the electrical activity within the heart will determine when repolarization occurs.
D)
the cell membranes need to stay calm resulting in muscle tissue becoming refractive.
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