Dear Irene,
I would recommend having an
echocardiogram performed by your cardiologist to evaluate your left ventricle. Right ventricular pacing probably does lead to some decrease in left ventricular function over time. This is in part due to the fact that the heart is normally activated from the sinus node located in the right atrium. Pacemakers usually pace the heart from the right ventricle, which alters the sequence of ventricular activation.
I would recommend regular exercise and continued follow-up with your cardiologist.
Thanks fou your question,
CCF-MD-KE