Having a short QT-interval in the
ECG does not in itself cause any symptoms, but it can lead to two
different types of rhythm disturbance, which causes symptoms.
The first type is atrial fibrillation,
which is an irregular heart rhythm originating in the upper chambers (artria)
of the heart. It causes palpitations,
shortness of breath, dizziness, chest
tightness and fatigue. It
can occur in short episodes, starting and stopping by themselves, or it
can become a more permanent condition.
The second type is ventricular
tachycardia or fibrillation. It is a very fast rhythm disturbance
originating in the lower chambers (ventricles) of the heart. It is a
much more serious problem, which can lead to
sudden cardiac death.
Rhythm disturbances from both upper and
lower chambers of the heart can in addition lead to
passing out spells (syncope),
where a person may wake up by him-/herself.