What is the difference between CRT-P and CRT-D? Intro

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• What is the difference...
In cardiology, CRT stands for cardiac resynchronization therapy. CRT is used in heart failure with reduced ejection fraction. Heart failure with reduced ejection fraction, is a type of heart failure in which the pumping function of the left ventricle is reduced. Left ventricle is the lower left chamber of the heart. CRT is a type of pacemaker in which electrical leads are placed in three chambers of the heart, right upper chamber (right atrium), right lower chamber (right ventricle) and the left ventricle.