Mice underwent PAB surgery to induce RVF. PAB gradient was confirmed by echocardiography. At the time of surgery, animals were randomly assigned to receive locked nucleic acid (LNA)‐anti‐miR‐34a (25 mg/kg) intraperitoneally (n=9) or scramble control (n=8). Clinical and echocardiographic assessment was performed weekly, and animals were euthanized at the onset of overt heart failure. Capillary assessment and miR and protein expression studies were performed as described above in a subset of animals based on sample availability.