A nurse is assessing a 68-year-old patient with heart failure who has been receiving IV furosemide therapy for 3 days. Which assessment finding would be the MOST concerning and require immediate intervention?
1Blood pressure decreased from 150/90 mmHg to 130/80 mmHg with mild dizziness
2Serum potassium level of 2.8 mEq/L with muscle weakness and irregular heart rhythm✓ 정답
3Urine output of 2,500 mL in the past 24 hours with clear urine color
4Weight loss of 4 pounds over 3 days with improved breathing
해설
Severe hypokalemia (K+ 2.8 mEq/L) with muscle weakness and irregular heart rhythm requires immediate intervention due to risk of life-threatening arrhythmias. Other findings are expected responses to diuretic therapy.
Clinical Judgment
This question evaluates Prioritization and Clinical Judgment. Loop diuretics like Furosemide aim for effective fluid reduction but carry the dangerous side effect of severe Hypokalemia. Option 2's "Serum potassium 2.8 mEq/L" is a dangerously low level, significantly below the normal range (3.5-5.0 mEq/L), and is accompanied by symptoms of muscle weakness and irregular heart rhythm. This is a direct danger signal that hypokalemia is already affecting cardiac electrophysiology and neuromuscular function, potentially leading to life-threatening arrhythmia. The other options are expected effects of treatment (weight loss, blood pressure decrease, increased diuresis) or do not represent an immediate emergency on their own.
Memory TipK is a Killer! Severe Kalium (potassium) depletion can cause Killer arrhythmias that require immediate reporting. Remember "Low K = Lethal".
KR vs US
In Korea, there are strict regulations on the concentration and rate for intravenous potassium replacement. It is similar in the US, but the NGN exam equally assesses severe hypokalemia with symptoms as the top priority situation requiring Notify HCP! However, in US clinical practice, oral potassium replacement along with electrocardiogram (EKG) monitoring may be considered more actively.
Clinical Practice Guide
When managing patients receiving loop diuretics like furosemide, regular electrolyte testing (especially potassium, sodium, magnesium) is essential. Muscle weakness, fatigue, cramps, irregular pulse, ECG changes (U wave, QT prolongation) are key symptoms that should raise suspicion for hypokalemia. During patient education, you should guide them to consume potassium-rich foods (bananas, orange juice, potatoes).
Caution
In SATA (Select All That Apply) questions, if instructed to choose the "most concerning" finding, you must select only one. This type of question tests your ability to judge priority based on risk level, not to list all complications. You should choose the one with the highest "potential for life threat."
Hypokalemia — Serum potassium level has fallen below the normal range (3.5-5.0 mEq/L). It can cause cardiac arrhythmias, muscle weakness, and fatigue, and is common as a side effect of diuretics.
Furosemide — A powerful 'loop diuretic' that blocks the sodium-potassium-chloride cotransporter in the ascending limb of the loop of Henle. It produces a rapid and strong diuretic effect but promotes the excretion of potassium, magnesium, and calcium.
Arrhythmia — A condition where the rhythm or rate of the heartbeat is abnormal. Hypokalemia can cause life-threatening arrhythmias such as ventricular fibrillation, requiring immediate intervention.
Loop Diuretic — A class of drugs that acts on the loop of Henle in the kidney to produce a potent diuretic effect. Includes furosemide, bumetanide, etc., and is used in acute pulmonary edema or severe fluid overload.
Clinical Judgment — The complex cognitive process in which a nurse collects, analyzes, and interprets patient data, recognizes problems, predicts outcomes, plans and implements interventions, and evaluates the results. This question assesses the ability to determine the "most dangerous" finding among multiple assessment findings.