A client with heart failure (HF) returns to the clinic two weeks after adjustments were made to the prescribed cardiac glycoside, diuretic, and potassium supplement. The client's lungs are clear, heart rate is 58 beats/minute, and serum potassium level is 2.9 mEq/L (2.9 mmol/L). Which action is most important for the nurse to implement?

Reference Range:

Potassium (K+) [3.5 to 5.0mEq/L (3.5 to 5.0 mmol/L)]

Compare the weight with what it was at last visit.

Report serum potassium to healthcare provider.

Review the dietary history from the past week.

Check the pretibial areas and ankles for edema.

Answer and Explanation

The Correct Answer is B

A.   While weight monitoring is important for heart failure management, it's not the priority in this situation. The low potassium level is a more immediate concern.
B.   The serum potassium level of 2.9 mEq/L is significantly below the normal range and indicates hypokalemia. Hypokalemia can lead to serious cardiac arrhythmias, especially in patients taking cardiac glycosides. This is a critical finding that requires immediate attention from the healthcare provider.
C.   Dietary intake can contribute to potassium levels, but it's not the most urgent action at this time.
D.   Assessing for edema is important for monitoring heart failure status, but it's not the priority when there's a critical electrolyte imbalance.

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Correct Answer is C

Explanation

A. A chest x-ray can be useful to assess for complications or changes in lung status, such as pneumothorax, pleural effusion, or changes in lung volume. However, the change in drainage color from viscous green to clear watery fluid may not immediately warrant an x-ray unless there are additional clinical concerns or symptoms suggesting a need for imaging.
B. Continuing the IV antibiotic schedule is important if there is an ongoing infection that needs treatment. However, if the change in drainage is significant and suggests a potential change in the underlying condition or complication, it’s important to evaluate the cause of the change rather than solely relying on antibiotics.
C. Obtaining a specimen of the drainage for culture is a valuable action if there is concern about infection or if the drainage characteristics have changed unexpectedly. Clear, watery fluid could indicate the presence of serous fluid or a change in the nature of the drainage, potentially due to infection or resolution of an infection.
D. “Milking” or stripping the chest tube is not recommended as a routine practice because it can create negative pressure and potentially damage the pleural tissues or exacerbate issues. Additionally, the change in the drainage from viscous green to clear watery fluid does not necessarily indicate that clots are present or that tube milking would be helpful.

A. Calcium level 7.2 mg/dL (1.8 mmol/L). B. Potassium level 3.8 mg/dl. (3.8 mmol) C. Sodium level 140 mEq/L (140mmol/L). D. Oxygen saturation level 97%.

Correct Answer is A

Explanation

A. This calcium level is below the normal reference range (8.4 to 10.6 mg/dL or 2.10 to 2.50 mmol/L), indicating hypocalcemia. Calcium plays a crucial role in cardiac muscle contraction and electrical conduction. Low calcium levels can lead to various cardiac dysrhythmias, including prolonged QT intervals and increased risk of ventricular arrhythmias.

B. This potassium level falls within the normal range (3.5 to 5.0 mEq/L or 3.5 to 5.0 mmol/L). Potassium is essential for maintaining normal cardiac rhythm, but a level of 3.8 mg/dL is not abnormal and, therefore, is less likely to be the cause of a dysrhythmia compared to abnormal levels.
C. This sodium level is within the normal reference range (136 to 145 mEq/L or 136 to 145 mmol/L). Sodium levels typically do not directly cause dysrhythmias unless they are extremely high or low, which is not the case here. Thus, a sodium level of 140 mEq/L is not likely to be the primary contributor to the dysrhythmia.
D. This oxygen saturation level is considered normal (95% to 100%). While oxygenation is critical for overall heart function and can influence cardiac health, a saturation level of 97% is not likely to be a direct cause of a dysrhythmia, especially if it falls within the normal range.

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