You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Falsely prolonged QT interval may be a feature of which one of the following conditions? and explain in detail?
Hypokalemia (plasma K+ ~ 3.5 mEq/L) causes a widened concentration gradient for K+ (inside & outside). This results in altered repolarization of ventricles and there would be prominent U wave now, which will immediately follow the T wave. The actual QT interval remains normal (~ 0.4 sec); however, the U wave is erroneously considered a pa of the T wave, and a falsely prolonged QT interval of 0.6 sec is measured.