The purpose of this study is to determine whether cardiac resynchronization therapy with the use of an implanted electronic pacemaker reduces morbidity associated with chronic thromboembolic pulmonary hypertension
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Improvement in right/left ventricular synchrony measured using tissue Doppler echocardiography
Timeframe: within 8 months after pacemaker implantation
Increase in cardiac output measured using Doppler echocardiography and scintigraphy
Timeframe: within 8 months after pacemaker implantation
Increase in functional capacity measured with six-minute walking distance
Timeframe: within 8 months after pacemaker implantation