How can excessive potassium affect EKG readings?

Excessive potassium levels, or hyperkalemia, have a significant effect on cardiac electrophysiology, which is reflected in EKG readings. One of the hallmark changes associated with high potassium levels is the widening of the QRS complex. This happens because increased potassium disrupts the normal depolarization of cardiac myocytes, slowing conduction through the ventricles. As a result, the QRS duration lengthens, which can also lead to more serious arrhythmias if left unaddressed.

The relationship between potassium levels and cardiac activity is crucial for interpreting EKGs in a clinical setting, as alterations in the QRS complex can indicate severe electrolyte imbalances and inform the need for immediate medical action. Understanding this connection helps EKG technicians recognize life-threatening conditions related to electrolyte disturbances.