Accordions

Implantable Cardioverter Defibrillator (ICD)

Devices that monitor the heart for potentially dangerous types of heart rhythms, such as ventricular fibrillation (when the heat muscles contract in a completely chaotic manner so that no blood is pumped) or tachycardia (when the heart beats very fast). When an ICD detects such a rhythm, it delivers electrical shocks to try and restore […]

Read more

Cardiac Resynchronization Therapy (CRT)

Also referred to as biventricular pacing, is a form of therapy for CHF in which a specialized pacemaker is used to re-coordinate the action of the right and left ventricles. CRT is indicated for CHF patients that suffer from cardiac dyssynchrony characterized by a prolonged QRS duration.

Read more

QRS Complex

The sharp peak on an electrocardiogram (ECG, a recording of the heart’s electrical activity) that corresponds to the electrical activity generated when the muscles of the ventricles become activated and start contracting. Normally, the duration of the QRS complex is less than 120 milliseconds, indicating that the entire heart muscle becomes activated within 120 milliseconds. […]

Read more

Ejection Fraction (EF)

Is the amount of blood pumped out of the heart’s main pumping chamber (i.e., the left ventricle) with each heartbeat, expressed as a percent of the volume of blood inside this chamber at the start of the beat. The heart normally ejects about 55-70% of the blood in its ventricle with each contraction. People with […]

Read more