What is a classic EKG finding in a patient with hyperkalemia?

In patients with hyperkalemia, one of the classic EKG findings is the presence of peaked T-waves. This occurs due to the effect of elevated potassium levels on cardiac myocytes, which alters the conduction and repolarization of the heart. As potassium levels increase, particularly above 5.5 mEq/L, the T-wave begins to rise, become pointed and narrow, resembling a "tented" appearance. This can also lead to other changes as hyperkalemia progresses, including widening of the QRS complex and ultimately, if severe, can lead to a sine wave pattern or even ventricular fibrillation.

While other EKG changes can occur in various conditions, peaked T-waves specifically are strongly associated with hyperkalemia and are often one of the first notable changes noticed on an EKG strip when assessing a patient suspected of having elevated potassium levels. Recognizing these characteristic changes is crucial for prompt diagnosis and treatment of hyperkalemia, as it can lead to life-threatening arrhythmias if not addressed.