A client recovering from cardiac surgery experiences a dysrhythmia, noted on the telemetry monitor. Which assessment finding is most likely to have contributed to the development of the dysrhythmia?

Reference Range:

Total Calcium [8.4 to 10.6 mg/dL (2.10 to 2.50 mmol/L)]

Sodium [136 to 145 mEq/L (136 to 145 mmol/L)]

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

Calcium level 7.2 mg/dL (1.8 mmol/L).

Potassium level 3.8 mg/dl. (3.8 mmol)

Sodium level 140 mEq/L (140mmol/L).

Oxygen saturation level 97%.

Answer and Explanation

The Correct Answer is A

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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Correct Answer is B

Explanation

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.

A. Vomiting B. Altered blood coagulation C. Visual disturbances D. Drowsiness E. Aphasia F. Ataxia

Correct Answer is ["B","C","D","F"]

Explanation

A. Vomiting is not a common side effect of phenytoin but could occur in some patients. It’s more likely a
reaction to the medication rather than a frequent side effect.
B. Phenytoin can affect blood coagulation. It may interfere with vitamin K metabolism, which can alter coagulation pathways and increase the risk of bleeding or bruising. Monitoring for signs of bleeding or changes in clotting status is important, particularly in patients on long-term therapy.
C. Visual disturbances, including nystagmus (involuntary eye movements), double vision, or blurred vision, can occur with phenytoin use. This side effect is related to the medication’s impact on the nervous system.
D. Drowsiness is a common side effect of many antiepileptic drugs, including phenytoin. It can affect the client’s alertness and overall level of consciousness, making it important for the nurse to monitor and address any related safety concerns.
E. Aphasia, or difficulty with language and speech, is not a typical side effect of phenytoin. While phenytoin affects the central nervous system, aphasia is not commonly reported with its use.
F. Ataxia, or lack of coordination and unsteady movements, is a known side effect of phenytoin. This occurs due to its effects on the nervous system and can impair motor skills and coordination.

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Naxlex Comprehensive Predictor Exams

Correct Answer is B

Explanation

Exhibits The healthcare provider comes to the bedside following the seizure and prescribes phenytoin. The nurse administers the phenytoin as prescribed. Which possible side effect(s) of phenytoin should the nurse assess for after administration? Select all that apply.

Correct Answer is ["B","C","D","F"]

Explanation

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