Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content +++ ECG Findings ++ Flattened or inverted T waves Prominent U waves that can merge with the T waves producing the appearance of a prolonged QT ST-segment depression Conduction disturbances +++ Pearls ++ Hypokalemia can produce varied ECG changes associated with the repolarization phase of the cardiac cycle. Unlike hyperkalemia, in hypokalemia, there is no direct correlation with the potassium level and the severity of ECG changes. However, more ECG changes may become apparent as the potassium level falls. Suspect hypomagnesemia if the ECG does not normalize after potassium replacement. ++ FIGURE 23.49A Hypokalemia. (ECG contributor: R. Jason Thurman, MD.) Graphic Jump LocationView Full Size||Download Slide (.ppt) ++ FIGURE 23.49B This ECG demonstrates multiple findings consistent with hypokalemia: flattened T waves (blue arrowhead), U waves (black arrowhead), prolonged QT (QU) intervals (double arrow), and ST-segment depression (arrow). This patient’s potassium level was 1.9. Graphic Jump LocationView Full Size||Download Slide (.ppt) Your Access profile is currently affiliated with '[InstitutionA]' and is in the process of switching affiliations to '[InstitutionB]'. Please click ‘Continue’ to continue the affiliation switch, otherwise click ‘Cancel’ to cancel signing in. Get Free Access Through Your Institution Learn how to see if your library subscribes to McGraw Hill Medical products. Subscribe: Institutional or Individual Sign In Username Error: Please enter User Name Password Error: Please enter Password Forgot Password? Forgot Username? Sign in via OpenAthens Sign in via Shibboleth