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CCI CRNFA (CRNFA ) Practice Tests & Test Prep by Exam Edge

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CCI Certified Registered Nurse First Assistant Sample Test

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The CNS is dealing with the physiologic changes that would affect responses to pharmacologic agents she is prescribing to her elderly patient. As the individual ages, she knows that what is happening to affect this process?

Correct Answer:

there is decreased albumin concentration necessary for metabolism.

the aging process involves numerous physiological changes that can impact how the body responds to medications. one of the significant changes concerns the concentration of albumin, a protein primarily produced by the liver. albumin plays a crucial role in the metabolism of many pharmacologic agents because it acts as a carrier for various substances including drugs, hormones, and other proteins. medications are often protein-bound, which means they attach to albumin molecules to be transported through the bloodstream to their sites of action or metabolism.

as individuals age, the production of albumin by the liver decreases. this reduction in albumin levels leads to a decrease in the number of available binding sites for medications within the blood. consequently, there is an increase in the proportion of free, unbound drug in the plasma. since it is the unbound (free) form of the drug that is pharmacologically active and capable of crossing cell membranes, an increase in this fraction can enhance the drug's effects, potentially leading to toxicity. this situation is particularly critical for drugs with a narrow therapeutic index, where the margin between effective and toxic doses is slim.

moreover, other age-related changes compound the impact of decreased albumin concentration. for example, the decrease in renal function, characterized by a lowered glomerular filtration rate, means that the elimination of drugs from the body is also reduced. this can further increase the risk of drug accumulation and toxicity. similarly, changes in liver function can impair drug metabolism, leading to prolonged drug half-life and increased exposure.

contrary to some misconceptions, changes in body fat composition, which indeed occur with aging, do not directly affect the metabolism of most medications. however, they can influence the distribution and storage of lipid-soluble drugs. on the other hand, changes such as decreased gastric emptying rate can affect the absorption phase of drug administration, potentially altering the onset of drug action.

in summary, the decreased albumin concentration necessary for metabolism is a critical factor that must be considered when prescribing medications to elderly patients. this condition necessitates careful adjustment of drug dosages and vigilant monitoring for signs of drug overdose or adverse effects. understanding and managing these physiological changes are essential for optimizing pharmacotherapy in the aging population, thereby improving their therapeutic outcomes and quality of life.