I have heart transplant with pacemaker having RBBB and recently I had some frequent PVCs otherwise 5-10 per day. Blood work, ECG and echo found normal. Once I saw low frequency 86 bps inversion of waves (9 of them) on continuous recording. Are these symptoms to worry about?
When was your pacemaker last checked? With all other tests normal, the next step is to make sure that your pacemaker is sensing & pacing properly. Another thing I am somewhat concerned about is that new arrhythmias may be a symptom of coronary artery disease in your transplanted heart. The way to examine this with an exercise ECHO, Coronary angiography, Nuclear (thallium/sestamibi)or Dobutamine stress echocardiography, or an Intravascular ultrasound.
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Hope this helps,