Download PDF โ RRB NS UT09 | Medical-Surgical Nursing Practice Test 1: Cardiorespiratory Care
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RRB NS UT09 | Medical-Surgical Nursing Practice Test 1: Cardiorespiratory Care
Q1. A patient is admitted with crushing substernal chest pain radiating to the left jaw and diaphoresis. Which serum cardiac biomarker rises earliest within 1 to 3 hours following acute myocardial infarction?
Myoglobin may rise early (roughly 1โ3 hours) after myocardial injury, but it is nonspecific and is not the preferred biomarker for diagnosing ACS; cardiac troponin, preferably high-sensitivity, is the biomarker of choice.
Q2. Which clinical assessment finding is recognized as the most definitive and highly specific serum biomarker for confirming acute myocardial necrosis?
Cardiac Troponin I and Troponin T are highly sensitive and myocardial-specific structural proteins, remaining elevated for 7 to 14 days following an acute myocardial infarction.
Q3. A patient in the coronary care unit exhibits a 12-lead ECG with ST-segment elevation in leads II, III, and aVF. Which anatomical region of the myocardium is infarcted?
Leads II, III, and aVF reflect electrical activity of the inferior wall of the left ventricle, which is typically perfused by the Right Coronary Artery (RCA).
Q5. A patient receiving intravenous furosemide for acute decompensated heart failure is at highest risk for developing which serum electrolyte derangement?
Furosemide is a potent loop diuretic that blocks Na+/K+/2Cl- symporters in the ascending limb of Henle, causing substantial urinary potassium excretion and resultant hypokalemia.
Q6. A patient with congestive heart failure is prescribed digoxin. Which therapeutic serum concentration range must the nurse monitor to prevent clinical toxicity?
A) 0.05 to 0.2 ng/mL
B) 0.5 to 0.9 ng/mL (commonly targeted in heart failure)
B) 0.5 เคธเฅ 0.9 ng/mL (เคนเคพเคฐเฅเค เคซเฅเคฒเฅเคฏเฅเคฐ เคฎเฅเค เคธเคพเคฎเคพเคจเฅเคฏ เคฒเคเฅเคทเฅเคฏ)
C) 10 to 20 ng/mL
D) 3.0 to 5.0 ng/mL
Answer: (B)
For heart failure, lower serum digoxin concentrations (about 0.5โ0.9 ng/mL) are generally preferred; toxicity can occur even within a laboratory reference range, so interpret levels with symptoms, renal function, potassium, and timing of sampling.
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