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Home Q & A Board Biology-Related Homework Help Medicine Nursing and Clinical
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mlbedell mlbedell
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6 years ago
An 88-year-old client has been diagnosed with heart disease and a severe heart block.
 
  Based on the changes in the cardiovascular system caused by aging, what is the most likely reason an older adult is at an increased risk for a heart block that requires an electrical pacemaker? A) Calcification of vessel walls
  B) Lipid accumulation in the cardiovascular system
  C) Decreased fibers in the bundle of His
  D) Decreased number of pacemaker cells in the SA node
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#1
6 years ago
C
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As an effect of aging in older adults, there is a concurrent decrease in fibers of the bundle of His, which contributes to increased incidence of heart block. In older adults, the number of pacemaker cells in the SA node decreases, increasing the incidence of sinus function dysfunction, not a heart block. Calcification of blood vessels and lipid accumulation result in valve stenosis, not heart block.
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