Table 1.

 Heart Failure Risk Status (HFRS) parameters by device type

HFRS parameter	CRT-D	CRT-P	PPM
OptiVol™ (intrathoracic impedance)	✓	✓	✓
Physical activity	✓	✓	✓
Night ventricular rate	✓	✓	✓
Heart rate variability	✓	✓	✓
AF/atrial tachycardia (AT) burden	✓	✓	✓
Ventricular rate during AF/AT	✓	✓	✓
% CRT pacing	✓	✓
Treated VT/VF	✓
Shocks	✓

AF, atrial fibrillation; CRT, cardiac resynchronization therapy; VT/VF, ventricular tachycardia/fibrillation.