Correct Answer: D

Rationale: Calcium channel blockers are often prescribed for the management of hypertension because they can help relax blood vessels and slow the heart rate, thus reducing blood pressure. One of the major adverse effects associated with calcium channel blockers is bradycardia (slow heart rate) or even more rarely, tachycardia (fast heart rate). Therefore, in a patient prescribed a calcium channel blocker for hypertension, the nurse should closely monitor for any signs and symptoms of tachycardia as it can be a serious adverse effect that needs prompt evaluation and intervention to prevent complications.

Correct Answer: D

Rationale: Respiratory depression resulting from drug overdose typically leads to a decrease in the respiratory rate, known as bradypnea. This is characterized by abnormally slow breathing, which can be dangerous as it may lead to decreased oxygen levels in the blood. Bradypnea indicates a slowing down of the respiratory drive, in contrast to hyperventilation, biot's respiration, or tachypnea. It is crucial for the nurse to monitor a patient experiencing respiratory depression for signs of bradypnea and intervene promptly to prevent further complications.

Correct Answer: C

Rationale: Prolonged labor is a condition in which labor lasts for an extended period, typically more than 20 hours for first-time mothers and more than 14 hours for experienced mothers. Prolonged labor can contribute to slowing down uterine involution because the prolonged pressure and strain on the uterus can affect its ability to return to its pre-pregnancy size and position. The prolonged contractions and stretching of the uterine muscles can hinder the normal process of uterine involution, leading to a delay in the uterus shrinking back to its non-pregnant state. Additionally, prolonged labor can increase the risk of postpartum complications such as excessive bleeding and infection, which can further impact uterine involution. Therefore, it is crucial for healthcare providers to monitor labor progress closely to prevent prolonged labor and its potential effects on uterine involution.

Correct Answer: B

Rationale: Unstable angina is characterized by chest pain at rest, which is not relieved by nitroglycerin. The ECG findings in unstable angina typically show ST-segment depression or T-wave inversion. It is considered a medical emergency as it can progress to a myocardial infarction. Stable angina, on the other hand, is chest pain or discomfort that occurs with exertion and is relieved by rest or medications like nitroglycerin. Acute myocardial infarction would typically present with ST-segment elevation on ECG, while Prinzmetal's angina is characterized by transient ST-segment elevation due to coronary artery vasospasm.

Correct Answer: B

Rationale: Uterine hyperstimulation, also known as tachysystole, is a condition where the uterus contracts too frequently and/or too forcefully, leading to a decreased uterine blood flow. This can result in maternal fatigue and decreased oxygenation to the fetus, as mentioned in the scenario. Uterine hyperstimulation can be caused by several factors, including the excessive use of uterotonic medications, such as oxytocin, or the presence of uterine abnormalities.