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- W2375539234 abstract "Objective:To evaluate the effect of right atrial and ventricular DDD pacing on ventricular activation and ventricular contraction synchrony by equilibrium radionuclide angiography(ERNA). Methods: Group 1 included 10 individuals with a normal ECG, normal wall motion and cardiac function. Normal phase image was obtained from this group. Group 2 included 10 patients with SSS or intermittent Ⅱ° AVB implanted with right atrial and ventricular DDD pacing. Group 1 underwent ERNA only once. The test was performed on group 2 3-6 days after implantation. The scintigraphic data were obtained during spontaneous sinus rhythm and during pacing rhythm. Phase image analysis was used to study ventricular activation sequence and ventricular synchrony. The site of phase onset was compared with the position of ventricular electrode on X-ray film. Results: (1) Group 1 Phase image analysis revealed a homogeneous pattern and a narrow histogram. The phase shift was 51.78°±5.81°. The activation of two ventricles occurred at the same time, from proximal septum or left ventricular base to cardiac apex. (2) Group 2 phase analysis showed right ventricle activated earlier than left ventricle during pacing, and phase shift was significantly greater during pacing than during sinus rhythm (64.13°±16.81° vs 52.88°±9.26°, P0.01). The activation of two ventricles occurred at the same time during sinus rhythm, and spread from proximal septum or left ventricular base to cardiac apex. The earliest activation occurred at right ventricular apex and spread to cardiac base part and left ventricle during pacing. The phase onset corresponded to the position of right ventricular electrode identified on X-ray film. (3) Phase shift was similar between group1 and group2 during sinus rhythm. Group 2 had a significantly greater phase shift during pacing rhythm compared with group1. Conclusion: Right ventricular pacing changed ventricular activation and reduced ventricular synchrony. Phase analysis could localize the pacing site." @default.
- W2375539234 created "2016-06-24" @default.
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- W2375539234 date "2003-01-01" @default.
- W2375539234 modified "2023-09-27" @default.
- W2375539234 title "Phase analysis of right ventricular DDD pacing" @default.
- W2375539234 hasPublicationYear "2003" @default.
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