Potassium is an important bodily electrolyte which is kept within tight limits in health. Many
medical conditions as well as commonly-used drugs either raise or lower blood potassium …

Background: Slow adaptation of the QT interval to abrupt changes in heart rate (HR) can
enhance ventricular heterogeneity and has been suggested as a marker of arrhythmic risk …

Objective: The clinical significance of QT interval adaptation to heart rate changes has been
poorly investigated in atrial fibrillation (AF), since QT delineation in the presence of f-waves …

Background: Heart failure (HF) management increasingly relies on innovative solutions to
enhance monitoring and care. Wearable devices, originally popularized for fitness tracking …

The adaptation lag of the QT interval after heart rate (HR) has been proposed as an
arrhythmic risk marker. Most studies have quantified the QT adaptation lag in response to …

Background: The autonomic nervous system (ANS) is known as a potent modulator of the
initiation and perpetuation of atrial fibrillation (AF), hence information about ANS activity …

Background: Slower adaptation of the QT interval to sudden changes in heart rate has been
identified as a risk marker of ventricular arrhythmia. The gradual changes observed in …

Background: An abnormal variation in blood electrolytes, such as potassium, contributes to
mortality in children admitted to intensive care units. Continuous and real-time monitoring of …

Objective: T-wave alternans (TWA) manifests as beat-to-beat fluctuations of T-wave
morphology on the electrocardiogram (ECG), with physiological bases not fully understood …

The electrocardiogram signal (ECG) represents the electrical activity of the heart measured
at the body surface. Characteristic waves and their delineation marks are studied to define …