Cardiac focus
ECG and QTc review are central, not ceremonial.
A baseline ECG should be obtained and interpreted with a documented QTc value rather than a general statement that the tracing is “normal.” Review should consider rate, rhythm, conduction findings, T-wave changes, prior ECGs when available, and the limitations of automated readings.
Abnormal QTc results, a history of fainting or unexplained palpitations, known arrhythmia, family history suggestive of inherited rhythm syndromes, or use of QTc-affecting medicines should prompt appropriately qualified cardiac review. The cardiac safety guide provides a companion outline of the questions that make this part of screening more specific.
Electrolytes are part of the same safety picture. Potassium, magnesium, and calcium abnormalities can affect electrical stability, while dehydration, gastrointestinal losses, diuretics, or acute illness can make one set of values an incomplete picture of current risk.