A nurse is reviewing the EKG strip of a client who has prolonged vomiting. Which of the following abnormalities on the client’s EKG should the nurse interpret as a sign of hypokalemia?
A.
Inverted P wave
B.
Wide ORS
C.
Elevated ST segment
D.
Abnormally prominent U wave
The correct answer and Explanation is :
The correct answer is D. Abnormally prominent U wave.
Explanation:
Hypokalemia, or low potassium levels in the blood, can have several characteristic effects on the EKG (electrocardiogram). Among the various EKG changes associated with hypokalemia, one of the most notable is the presence of an abnormally prominent U wave.
1. Understanding the U Wave:
The U wave is a positive deflection that follows the T wave on an EKG. It is not always visible in all EKGs, but when it is prominent, it often indicates an underlying issue. In the context of hypokalemia, the U wave becomes more pronounced and is typically seen in the leads where T waves are also present. This prominence of the U wave can be a key diagnostic clue.
2. Other EKG Changes in Hypokalemia:
- Inverted P Wave (Option A): While changes in the P wave can occur in various conditions, an inverted P wave is not a specific sign of hypokalemia. It might be seen in other conditions such as atrial abnormalities.
- Wide QRS Complex (Option B): A wide QRS complex is more commonly associated with conditions such as bundle branch block or ventricular rhythm disturbances rather than hypokalemia alone.
- Elevated ST Segment (Option C): An elevated ST segment typically suggests myocardial ischemia or injury and is not a classic finding in hypokalemia.
3. Clinical Relevance:
Hypokalemia can be caused by prolonged vomiting due to the loss of potassium. This electrolyte imbalance can lead to changes in cardiac electrical activity, which is reflected in the EKG. Monitoring the EKG for an abnormally prominent U wave helps in diagnosing hypokalemia and assessing the severity of the electrolyte imbalance.
In summary, the abnormally prominent U wave is a specific and reliable indicator of hypokalemia, making it crucial for nurses and healthcare providers to recognize this abnormality on an EKG strip to initiate appropriate treatment and management.