Search results for "Vdd pacing"

showing 3 items of 3 documents

Cardiac output in single-lead VDD pacing versus rate-matched VVIR pacing.

1995

The importance of atrioventricular synchronous pacing compared with single-chamber rate-responsive pacing is still under discussion, especially for low-intensity workload representing daily life activities. We evaluated hemodynamics in single-lead VDD pacing versus VVIR pacing in 11 patients (8 men and 3 women, aged 58.6 +/- 13.8 years) with normal left ventricular function and a previously implanted single-lead VDDR pacemaker. A low-intensity steady-state treadmill test at 1 to 2.5 mph with a gradient of 2% to 4% was performed. Cardiac output was determined using a standard carbon dioxide rebreathing technique. Initially, the VDD mode was programmed, and after 5 minutes of exercise, cardia…

AdultMaleCardiac outputmedicine.medical_specialtyPacemaker ArtificialDaily life activitiesHemodynamicsOxygen ConsumptionInternal medicineMedicineHumansTreadmillCardiac OutputAgedVentricular functionbusiness.industryCardiac Pacing ArtificialMiddle AgedHeart BlockAtrial rateSingle leadAnesthesiacardiovascular systemCardiologyVdd pacingExercise TestFemaleCardiology and Cardiovascular MedicinebusinessThe American journal of cardiology
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Is atrial sensing of ventricular far-field signals important in single-lead VDD pacing?

1998

UNLABELLED In single-lead VDD pacing the atrial sensitivity frequently is programmed to sensitive values. Atrial sensing of ventricular far-field signals should be reduced by differential atrial sensing. The aim of the study was to evaluate the effectiveness of this approach. METHODS The study included 10 patients with a single-lead VDD pacemaker (Thera 8948, Lead 5032). The atrial sensitivity was set to its most sensitive value of 0.18 mV and the telemetered intraatrial EGM was continuously recorded. After atrial tracked ventricular pacing, VVI pacing was performed with pacing rates from 100 to 160 beats/min in steps of 10 beats/min and up to 165 beats/min. The peak-to-peak amplitudes of P…

Malemedicine.medical_specialtyPacemaker ArtificialHeart blockAtrial sensingInternal medicinemedicineHumansTelemetrySinus rhythmcardiovascular diseasesAgedbusiness.industryRate dependentCardiac Pacing ArtificialGeneral MedicineVentricular pacingmedicine.diseaseElectrodes ImplantedHeart BlockSingle leadcardiovascular systemVdd pacingCardiologyFemaleCardiology and Cardiovascular MedicinebusinessPacing and clinical electrophysiology : PACE
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A simple method for preoperative assessment of the best fitting electrode length in single lead VDD pacing.

1996

For single lead VDD pacing, electrodes with various distances between the lead tip and the floating atrial dipole (AV distance) are available. Using different AV distances allows positioning of the atrial dipole in the mid- to high right atrium, regardless of the size of the right heart. In this position, reliable atrial sensing and rejection of ventricular far-field potentials can be expected. A simple test for the preoperative assessment of the best fitting AV distance in the individual patient was tested. We studied 24 consecutive patients prior to implantation of a VDD pacemaker. With the patient in supine position, a test electrode with an AV distance of 13 cm was taped onto the thorax…

ThoraxAdultMalePacemaker ArtificialSupine positionmedicineFluoroscopyHumansHeart AtriaLead (electronics)AgedAged 80 and overmedicine.diagnostic_testbusiness.industryGeneral MedicineMiddle AgedElectrodes ImplantedDipoleSingle leadFluoroscopyElectrodeVdd pacingFemaleCardiology and Cardiovascular MedicinebusinessNuclear medicinePacing and clinical electrophysiology : PACE
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