QTc Intervals Plotted Against Time in cLQTS (concealed) Patients. Shown are the average QTc intervals in ms plotted against time (rest, peak exercise, 1, 3, 5, 7 and 9 minutes of recovery) in the patients with resting QTc intervals <460ms (cLQTS). cLQTS (cLQT1 and cLQT2) patients had longer QTc intervals compared to controls at all time intervals of the EST.