Paramedic National Registry Practice

Peaked T waves on an ECG are indicative of which condition?

1. Hypokalemia

2. Hyperkalemia

3. Myocardial infarction

4. Arrhythmia

The correct answer is: Hyperkalemia

Peaked T waves on an ECG are primarily indicative of hyperkalemia, which is an elevated level of potassium in the bloodstream. In a normal electrocardiogram, T waves are generally rounded and symmetrical. However, as potassium levels rise, the shape of the T waves changes, leading to a characteristic appearance where they become tall, narrow, and pointed. This change occurs as a result of alterations in the cardiac myocyte repolarization process. Elevated potassium levels affect the cardiac action potential, prolonging the repolarization phase and resulting in these distinctive peaked T waves. Recognizing this pattern is crucial for paramedics and healthcare providers, as it can signify a critical electrolyte imbalance that may lead to life-threatening arrhythmias if not addressed promptly. Understanding the connection between peaked T waves and hyperkalemia allows for swift clinical interventions, making it a key point of knowledge for professionals in emergency medical services.