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Figure 1 Actual right ventricular pressure waveforms derived from an implantable hemodynamic monitor (IHM) system, with an illustration of how the IHM determines the pressure values. dP/dt = contractility as measured by change in pressure over change in time; EGM = electrogram; ePAD = estimated pulmonary artery diastolic pressure; RVDP = right ventricular diastolic pressure; RVSP = right ventricular systolic pressure.