Medtronic PROTECTA XT DR D314DRG, Руководство для клиницистов

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or therapy begins. After the induction or therapy, the device reverts to its programmed
parameter values for bradycardia pacing and tachyarrhythmia therapy.
Programmed parameters check – Before displaying an induction screen, the system
verifies that the device is programmed to detect and treat an induced arrhythmia. If the
detection or therapy features are not programmed appropriately, a warning message
appears on the screen.
Programming head buttons – The Program button on the programming head is disabled
during EP study inductions and manual therapies. Use the appropriate button on the
programmer screen to deliver an induction or manual therapy. The Interrogate button on
the programming head is disabled during EP study inductions only. Use the [Interrogate]
button on the programmer screen to interrogate the device while the EP study induction
screen is active.
Last Induction (mm:ss) – A timer is available, for the T-Shock and ventricular 50 Hz Burst
protocols, to track the length of time since the last induction. The timer is located in the lower
left corner of the programmer screen.
10.7.2 Inducing VF with T-Shock
You may use the T-Shock induction to induce VF. To induce VF, the device delivers a series
of VOO pacing pulses to make the T-wave timing more predictable. The device then
simultaneously delivers a shock with a T-wave, the refractory period of the cardiac cycle.
The device allows you to specify the characteristics of the pacing pulses and high voltage
shock and to implement a delay between the final pacing pulse and the shock.
The T-Shock induction interface includes features to help simplify DFT testing. For more
information, see Section 5.5, “Performing ventricular defibrillation threshold tests”,
page 117.
10.7.2.1 Considerations for inducing VF with T-Shock
Warning: Monitor the patient carefully when using an EP study function. Have an external
defibrillator ready for use when inducing any tachyarrhythmia. An induced tachyarrhythmia
may degenerate to ventricular fibrillation.
ATP Before Charging and ATP During Charging – ATP Before Charging and ATP During
Charging are automatically disabled for 30 s after delivery of a T-Shock induction. This
prevents ATP therapies from interfering with defibrillation threshold testing.
The Enable check box – As a safety measure, you cannot select [DELIVER T-Shock] until
you have selected the Enable check box. After delivering a shock or exiting the T-Shock
screen, you must select the Enable check box before delivering another T-Shock induction.
Medtronic PROTECTA™ XT DR D314DRG
Clinician Manual 437