That palpitation feeling has a name.
Here's what ECG+ marks.
ECG+ analyzes your Apple Watch ECG and marks what it finds — clearly enough to show your doctor. Here's the full list of what it looks for, and what each finding means.
Early beats
The normal, regular heartbeat led by the heart's natural pacemaker — the result most recordings show.
An irregular, often rapid heart rhythm where the upper chambers beat chaotically instead of in a coordinated pattern.
An early beat originating in the atria — often felt as a skipped beat or flutter in the chest.
An early beat originating in the ventricles — often felt as a heavy thump or a heart that briefly "stops".
Interval & wave
A measure of how long the heart takes to recharge between beats. A prolonged QTc can signal an elevated risk of serious arrhythmia.
The T wave points downward instead of up, which can indicate reduced blood flow, right ventricular strain, or electrolyte imbalance.
The T wave loses its usual peak and becomes diminished or nearly flat — most commonly caused by low potassium or certain medications.
Repeat patterns
Two premature beats in a row.
Three premature beats in a row.
Every other beat is a premature beat — a repeating pattern of one normal, one early.
Every third beat is a premature beat — a repeating pattern of two normal, one early.
Every fourth beat is a premature beat — a repeating pattern of three normal, one early.