Dysfunctional Implantable Pulmonary Artery Sensor Device (CardioMEMS) in Group 2 Pulmonary Hypertension.

Implantable hemodynamic devices like the CardioMEMS HF System are commonly used to manage fluid status in patients with heart failure (HF) by measuring pulmonary pressures. Although CardioMEMS has been shown to reduce HF hospitalizations, rare complications (eg, device endothelialization) can occur and warrant clinical attention. A 67-year-old woman with HF with preserved ejection fraction and group 2 pulmonary hypertension experienced recurrent HF exacerbations. Despite optimal therapy, she was not a candidate for advanced HF therapies. The CardioMEMS device, initially effective for fluid management, showed dampened waveforms due to endothelialization, leading to reimplantation. Endothelialization is a rare but significant complication that can dampen pressure waveforms. Proper placement in vessels larger than 7 mm and careful monitoring of waveforms can help manage this issue. Device recalibration can usually address most cases; however, reimplantation may be required.