35

Defibrillation waveform

Philips Medical Systems

category

waveform parameters

nominal specifications

Biphasic truncated exponential. Waveform parameters are automatically adjusted as a function of patient defibrillation impedance. In the diagram at left, D is the duration of phase 1 and E is the duration of phase 2 of the waveform, F is the interphase delay (500 µs), and Ip is the peak current.

The HeartStart FRx delivers shocks to load impedances from 25 to 180 ohms. The duration of each phase of the waveform is dynamically adjusted based on delivered charge, in order to compensate for patient impedance variations, as shown below:

 

adult defibrillation

 

 

load

phase 1

phase 2

peak

delivered

resistance (Ω)

duration (ms)

duration (ms)

current (A)

energy (J)

25

2.8

2.8

65

128

50

4.5

4.5

40

150

75

6.25

5.0

30

155

100

8.0

5.3

24

157

125

9.65

6.4

21

159

150

11.5

7.7

18

160

175

12.0

8.0

16

158

 

pediatric defibrillation

 

 

 

(using Infant/Child Key 989803139311)

 

load

phase 1

phase 2

peak

delivered

resistance (Ω)

duration (ms)

duration (ms)

current (A)

energy (J)

25

2.8

2.8

35

43.4

50

4.5

4.5

22

50.2

75

6.3

5.0

16

51.8

100

8.0

5.3

13

52.4

125

9.0

6.0

11

52.3

150

9.0

6.0

10

50.2

175

9.0

6.0

9

48.1

APPENDICES

Page 43
Image 43
Philips 861304 owner manual Defibrillation waveform, Current a

861304 specifications

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