Search for: [Abstract = "3% in A\) and showed symptoms of heart failure. CONCLUSIONS\: 1. VDD\/R stimulation with a single\-pass lead is reliable in achieving effective AV synchronization over a 12\-month follow\-up. 2. The parameters of the atrial electrogram are stable over a 12\-month follow\-up and comparable with those obtained during the VDD\/R implantation procedure. 3. Detection of the signal from an atrial dipole placed in the upper part of the right atrium is the most stable. 4. The values of atrial amplitude obtained during the procedure, with an established acceptable detection threshold \(Aav > 1.0 mV\) and maintained stability of detection, are not crucial for atrioventricular synchronization. 5. Selected parameters obtained from ECG and echo examinations are correlated with effective AV synchronization. 6. Enlargement of the right and left heart chambers, reduction of the ejection fraction and congestive heart failure are not conducive to effective AV synchronization in VDD\/R pacemakers."]

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