U wave amplitude increases. Prominent U waves may become taller than the preceding T waves. When U wave merges with T wave, it may give the appearance of QT interval prolongation.
ECG 1a. The ECG above belongs to a 69 years-old woman.
She is receving Cisplatin and 5-Fluorouracil.
Cisplatin is a common cause of hypomagnesemia and hypokalemia.
This ECG was recorded in the Emergency Room, when her serum potassium level was measured as 2.4 mEq/L.
The rhythm is sinus tachycardia. Some leads show ST segment depression.
In this ECG, the ST segment depression is not related with coronary artery disease.
Her coronary angiogram last week showed normal coronary arteries.
Her ECHOcardiography is also normal: no structural hart disease.
Dr. Erkan Kısacik has donated the above ECG to our website.
ECG 1b. The ECG above belongs to the same patient. It was recorded one day after the ECG 1a.
Despite intravenous potassium infusion, her serum potassium level was still low (2.7 mEq/L).
ST segment depression persists, albeit to a lesser degree.
Dr. Meral Turkmen (Internal Medicine) has donated the above ECG to our website.
ECG 1c. The ECG above belongs to the same patient. It was recorded two days after the ECG 1a.
Despite additional intravenous potassium infusion, her serum potassium level was still low (2.95 mEq/L).
ST segment depression persists, albeit to a lesser degree
Dr. Meral Turkmen (Internal Medicine) has donated the above ECG to our website.