RN Physiological Adaptation NCLEX Questions Related

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A client is brought to the emergency department reporting chest pain. Assessment shows vital signs that include a blood pressure (BP) of 150/90 mm Hg, pulse (P) 88 beats per minute (BPM), and respirations (R) 20 breaths per minute. The nurse administers nitroglycerin 0.4 mg sublingually. The treatment is found to be effective when the reassessment of vital signs shows which data?

  • A. BP 150/90 mm Hg, P 70 BPM, R 24 breaths per minute
  • B. BP 100/60 mm Hg, P 96 BPM, R 20 breaths per minute
  • C. BP 100/60 mm Hg, P 70 BPM, R 24 breaths per minute
  • D. BP 160/100 mm Hg, P 120 BPM, R 16 breaths per minute
Correct Answer: B

Rationale: Nitroglycerin dilates both arteries and veins, causing blood to pool in the periphery. This causes a reduced preload and therefore a drop in cardiac output. This vasodilation causes the blood pressure to fall. The drop in cardiac output causes the sympathetic nervous system to respond and attempt to maintain cardiac output by increasing the pulse. Beta blockers, such as propranolol, are often used in conjunction with nitroglycerin to prevent this rise in heart rate. If chest pain is reduced and cardiac workload is reduced, the client will be more comfortable; therefore, a rise in respirations should not be seen.