A nurse is caring for a post-operative patient with a respiratory rate of 9 breaths/minute secondary to general anesthesia effects and incisional pain. Which arterial blood gas (ABG) would the nurse anticipate?
pH 7.50, pO2 85, pCO2 35, HCO3 30 mEq/L
pH 7.30, pO2 90, pCO2 35, HCO3 20 mEq/L
pH 7.50, pO2 95, pCO2 25, HCO3 22 mEq/L
pH 7.30, pO2 80, pCO2 55, HCO3 22 mEq/L
The Correct Answer is D
Choice A reason: The values pH 7.50, pO2 85, pCO2 35, HCO3 30 mEq/L indicate alkalosis with a high bicarbonate level, which is not consistent with the patient’s slow respiratory rate that would typically lead to respiratory acidosis.
Choice B reason: The values pH 7.30, pO2 90, pCO2 35, HCO3 20 mEq/L indicate metabolic acidosis with normal pCO2, which does not align with the respiratory issue described (hypoventilation).
Choice C reason: The values pH 7.50, pO2 95, pCO2 25, HCO3 22 mEq/L indicate respiratory alkalosis, which is characterized by a low pCO2. This is not consistent with the patient’s hypoventilation, which would lead to elevated pCO2 levels.
Choice D reason: The values pH 7.30, pO2 80, pCO2 55, HCO3 22 mEq/L indicate respiratory acidosis, which aligns with the patient’s hypoventilation due to anesthesia effects and incisional pain. The elevated pCO2 and decreased pH are consistent with reduced respiratory rate and shallow breathing.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A reason: A decreased heart rate is not a typical outcome of ACE inhibitor therapy. ACE inhibitors primarily work by relaxing blood vessels, which lowers blood pressure. They do not directly affect the heart rate. While some blood pressure medications can influence heart rate, this is not a common effect of ACE inhibitors like lisinopril.
Choice B reason: A decrease in chest pain is also not a primary outcome of ACE inhibitor therapy. While lowering blood pressure can help reduce the workload on the heart and potentially decrease angina (chest pain), this is more of an indirect effect. ACE inhibitors are primarily used for hypertension and heart failure, not specifically for pain relief.
Choice C reason: Hypokalemia, or low potassium levels, is not an expected outcome of taking an ACE inhibitor. In fact, ACE inhibitors can lead to hyperkalemia (high potassium levels) because they decrease aldosterone production, which causes the body to retain potassium. Patients on ACE inhibitors are often monitored for signs of hyperkalemia rather than hypokalemia.
Choice D reason: The correct and expected outcome of taking lisinopril, an ACE inhibitor, is decreased blood pressure. ACE inhibitors prevent the conversion of angiotensin I to angiotensin II, a potent vasoconstrictor. By reducing levels of angiotensin II, ACE inhibitors help relax blood vessels, which lowers blood pressure and makes it easier for the heart to pump blood. This is the primary therapeutic effect of the medication.
Correct Answer is B
Explanation
Choice A reason: Percutaneous Coronary Intervention (PCI) is a procedure used to open narrowed coronary arteries, usually with a balloon or stent. It is not a diagnostic test for assessing heart valves but rather a treatment for coronary artery disease.
Choice B reason: Echocardiography is a non-invasive imaging test that uses ultrasound waves to create detailed images of the heart's structures, including the heart valves. It allows for the assessment of valve function, structure, and blood flow, making it an essential tool for diagnosing valvular heart disease.
Choice C reason: Exercise testing, also known as a stress test, evaluates the heart's response to physical activity. While it can provide information on how well the heart handles increased workload and detect issues like ischemia, it is not specifically used for assessing heart valves.
Choice D reason: Electrocardiography (ECG or EKG) records the electrical activity of the heart and is used to detect arrhythmias, heart attacks, and other cardiac conditions. However, it does not provide detailed information about the heart valves' structure or function.
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