Dr turned off RV capture, now feeling short of breath and dizzy and tightness in lower neck area. Says RV lead pacing in unipolar. Could turning off RV capture cause the symptoms I am having? When I was in the hospital rep changed from bipolar to unipolar and set capture threshold to email@example.com. Couldmturning off the RV capture cause my symptoms? Any comments will be appreciated. I have a duel chamber biotronic pacemaker . I was in hospital for heart failure and first time afib!