ECG Analysis Algorithm Accuracy
9650-0806-01 Rev. D
Propaq MD Operator’s Guide
A-35
ECG Analysis Algorithm Accuracy
Sensitivity and specificity are expressions of ECG analysis algorithm performance when compared to
ECG interpretation by a clinician or expert. Sensitivity refers to the algorithm’s ability to correctly
identify shockable rhythms (as a percentage of the total number of shockable rhythms). Specificity
refers to the algorithm’s ability to correctly identify non-shockable rhythms (as a percentage of the
total number of non-shockable rhythms). The data in the following table summarizes the accuracy of
the ECG analysis algorithm as tested against ZOLL’s ECG Rhythm Database.
The algorithm sequence takes approximately 9 seconds and proceeds as follows:
•
Divides the ECG rhythm into three-second segments.
•
Filters and measures noise, artifact, and baseline wander.
•
Measures baseline content (‘waviness’ at the correct frequencies — frequency domain analysis)
of signal.
•
Measures QRS rate, width, and variability.
•
Measures amplitude and temporal regularity (‘auto-correlation’) of peaks and troughs.
•
Determines if multiple 3 second segments are shockable then displays SHOCK ADVISED
message.
Clinical Performance Results
The performance of the incorporated analysis algorithm in a single analysis sequence satisfies the
applicable requirements specified in ANSI/AAMI DF80 (section 6.8.3) and the recommendations by
Kerber et al. (Circulation. 1997;95(6):1677).
Table A-4.
Clinical Performance Results
References:
Young KD, Lewis RJ: “What is confidence? Part 2: Detailed definition and determination of
confidence intervals”. Annals of Emergency Medicine, September 1997; 30; 311-218
William H. Beyer, Ph.D.: “CRC Standard Mathematical Tables 28
th
Edition,” CRC Press, Inc, Boca
Raton, FL., 1981, Percentage Points, F-Distribution Table, pg 573.
Rhythms
Sample
Size
Performance Goals Observed
Performance
90% One-sided
Lower Confidence
Limit
Shockable
Sensitivity
Coarse VF
Rapid VT
536
80
>90%
>75%
>99%
>99%
>99%
>96%
Non-shockable
Specificity
NSR
AF, SB, SVT, Heart block,
idioventricular, PVCs
Asystole
2210
819
115
>99%
>95%
>95%
>99%
>99%
>99%
>99%
>99%
>97%
Intermediate
Fine VF
Other VT
69
28
Report only
Report only
Sensitivity
>89%
>96%
>81%
>84%
Summary of Contents for Propaq MD
Page 1: ...Propaq MD Operator s Guide 9650 0806 01 Rev D...
Page 40: ...CHAPTER 1 GENERAL INFORMATION 1 28 www zoll com 9650 0806 01 Rev D...
Page 60: ...CHAPTER 2 PRODUCT OVERVIEW 2 20 www zoll com 9650 0806 01 Rev D...
Page 74: ...CHAPTER 4 TRENDS 4 4 www zoll com 9650 0806 01 Rev D...
Page 84: ...CHAPTER 5 ALARMS 5 10 www zoll com 9650 0806 01 Rev D...
Page 94: ...CHAPTER 6 MONITORING ECG 6 10 www zoll com 9650 0806 01 Rev D...
Page 104: ...Chapter 7 Monitoring Respiration Resp and Heart Rate HR 7 10 www zoll com 9650 0806 01 Rev D...
Page 120: ...CHAPTER 8 MONITORING NON INVASIVE BLOOD PRESSURE NIBP 8 16 www zoll com 9650 0806 01 Rev D...
Page 154: ...CHAPTER 11 MONITORING INVASIVE PRESSURES IBP 11 10 www zoll com 9650 0806 01 Rev D...
Page 160: ...CHAPTER 12 MONITORING TEMPERATURE 12 6 www zoll com 9650 0806 01 Rev D...
Page 186: ...CHAPTER 14 12 LEAD ECG INTERPRETIVE ANALYSIS 14 16 www zoll com 9650 0806 01 Rev D...
Page 212: ...CHAPTER 17 ADVISORY CPR PROTOCOL DEFIBRILLATION 17 6 www zoll com 9650 0806 01 Rev D...
Page 222: ...CHAPTER 18 EXTERNAL PACING 18 10 www zoll com 9650 0806 01 Rev D...
Page 240: ...CHAPTER 21 PATIENT DATA 21 6 www zoll com 9650 0806 01 Rev D...
Page 268: ...CHAPTER 22 COMMUNICATIONS 22 28 www zoll com 9650 0806 01 Rev D...
Page 284: ...CHAPTER 24 MAINTENANCE 24 12 www zoll com 9650 0806 01 Rev D...
Page 326: ...ACCESSORIES B 6 www zoll com 9650 0806 01 Rev D...
