Medtronic PROTECTA XT DR D314DRG, Руководство для клиницистов

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7.2.1 System solution: pacing therapies
The system provides dual chamber and single chamber pacing modes to address different
cardiac conditions. Dual chamber pacing restores AV synchrony by sensing and stimulating
2 chambers of the heart, the right atrium and right ventricle. Single chamber pacing supports
patients with infrequent or no occurrences of asystole, or patients with chronic AT/AF and
for whom dual chamber pacing is not justified.
7.2.2 Operation of pacing and sensing
The output energy for pacing pulses in each chamber is determined by individually
programmed amplitude and pulse width parameters. Although you can program these
parameters manually, the Capture Management feature is available to manage pacing
output energies in the atrium and right ventricle. For more information, refer to Section 7.5,
“Managing pacing output energies with Capture Management”, page 238.
The device provides sensing in both the atrium and right ventricle. Refer to Section 7.1,
“Sensing intrinsic cardiac activity”, page 201, for information about sensing thresholds, lead
polarities, blanking periods, and refractory periods.
7.2.3 Operation of dual chamber pacing
In dual chamber modes, sensing and pacing occur in the atrium and ventricle. The dual
chamber pacing modes include DDDR, DDD, DDIR, and DDI. In the DDD mode, pacing
occurs at the programmed Lower Rate in the absence of intrinsic atrial activity. In the DDI
mode, pacing occurs at the programmed Lower Rate. In the DDDR and DDIR modes, which
are rate-responsive, pacing occurs at the sensor rate.
Medtronic PROTECTA™ XT DR D314DRG
Clinician Manual 213