User manual

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R-R interval of spontaneous activity (TCL - Tachycardia Cycle Length), typically at 85 % of

TCL. The distance of the subsequent stimulation impulses of the dose (BCL - Burst Cycle

Length) may be fixed (stimulation scheme Burst), and it is usually the same as the CI, or the

distance of the individual stimulation impulses is variable (stimulation scheme Ramp),

typically decreasing by 10 ms always with the next BCL. The ATP dose is repeated until the

tachycardia is interrupted. Repeated stimulation Burst with shorter BCL in the subsequent

dose is called the stimulation scheme Scan. Demonstrations of the Burst and the Ramp

schemes of ATP stimulation are presented in Fig. 3.6.

Fig. 3.6: Stimulation schemes Burst and Ramp for antitachycardia stimulation.

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Theaimandthecontentsofthemeasurements

 Defibrillators are medical devices used to suppress cardiac arrhythmias, such as

tachycardia of fibrillations, when the heart does not fulfil its physiological function due to

non-coordinated contractions. Correct function of the heart is restored by the defibrillator by

means of an electrical discharge, the so called defibrillation impulse, applied on the heart

muscle. Modern types of defibrillators use different shapes of defibrillation impulses with

different energy, which may vary between tenths of Joules and hundreds of Joules. Due to the

size of energy of the defibrillation pulse, thus also due to related currents of tens of amperes,

it is desirable to become acquainted with the function and the construction of these devices

and with correct processes of their utilization or electrical safety revision. The aim of this

measurement is to become acquainted with the function of the defibrillators in the

defibrillation mode and in the transcutaneous stimulation mode and to measure and to verify

the parameters and shapes of the stimulation pulses for different set-ups of the apparatus via a

defibrillator analyzer. There is a very important supplement in the form of defibrillator

measurements via an electro-revisional apparatus.