Search for: [Abstract = "INTRODUCTION\: VDD\/R stimulation is accepted as alternative mode of cardiac pacing to DDD\/R in patients with atrio\-ventricular conduction block \(AVB\) and preserved sinus node function. The use of VDD\/R pacemakers is rare compared with DDD\/R, despite many patients meeting the necessary criteria. The main reason for this is the possibility of inadequate preservation of AV synchronization, which requires effective detection of the atrial signal. So far what determines stable AV synchronization has not been unambigously established, nor has it been determined in which groups of patients this form of treatment should be avoided. THE AIM OF THE STUDY\: The aim of the study was to estimate the variability of the detection parameters of the endocavitary atrial signal, and the related effectiveness of AV synchronization over a 12\-month prospective observation period. In addition, an attempt has been made to determine the relationship between parameters obtained during assessment the patient for the implantation procedure, using electrocardiographic \(ECG\) and echocardiographic data, and the effectiveness of AV synchronization. MATERIAL AND METHODS\: The study involved a group of 65 patients \(43 male \- M, 22 female \- F\), aged 66.6±12.7 with clinically significant disturbances of AV conduction, who did not reveal symptoms of concommitant disturbance in SA node automaticity. Selected ECG and"]

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