Ventricular fibrillation electrocardiogram
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Electrocardiogram
Characteristics of the ventricular fibrillation waveform
Ventricular fibrillation can be described in terms of its electrocardiographic waveform appearance. All waveforms can be described in terms of certain features, such as amplitude and frequency. Researchers have looked at the frequency of the ventricular fibrillation waveform to see if it helps to elucidate the underlying mechanism of the arrhythmia or holds any clinically useful information. More recently, Gray has suggested an underlying mechanism for the frequency of the waveform that has puzzled investigators as possibly being a manifestation of the Doppler effect of rotors of fibrillation.[1] Analysis of the fibrillation waveform is performed using a mathematical technique known as Fourier analysis.
Power spectrum
The distribution of frequency and power of a waveform can be expressed as a power spectrum in which the contribution of different waveform frequencies to the waveform under analysis is measured. This can be expressed as either the dominant or peak frequency, i.e., the frequency with the greatest power or the median frequency, which divides the spectrum in two halves.
Frequency analysis has many other uses in medicine and in cardiology, including analysis of heart rate variability and assessment of cardiac function, as well as in imaging and acoustics.[2][3]
Shown below is an EKG image of ventricular fibrillation showing irregular heart rhythm, heart rate of more than 300 per minute, QRS duration unrecognizable and absent P waves.
Shown below is an EKG image of ventricular fibrillation showing irregular heart rhythm, heart rate of more than 300 per minute, QRS duration unrecognizable and absent P waves.
Shown below is an EKG image of ventricular fibrillation showing
- Irregular heart rhythm,
- Heart rate of more than 300 per minute
- QRS duration unrecognizable
- P waves absent
References
- ↑ Jalife J, Gray RA, Morley GE, Davidenko JM (1998). "Self-organization and the dynamical nature of ventricular fibrillation". Chaos. 8 (1): 79–93. doi:10.1063/1.166289. PMID 12779712.
- ↑ Shusterman V, Beigel A, Shah SI; et al. (1999). "Changes in autonomic activity and ventricular repolarization". J Electrocardiol. 32. Suppl: 185–92. doi:10.1016/S0022-0736(99)90078-X. PMID 10688324.
- ↑ Kaplan SR, Bashein G, Sheehan FH; et al. (2000). "Three-dimensional echocardiographic assessment of annular shape changes in the normal and regurgitant mitral valve". Am. Heart J. 139 (3): 378–87. doi:10.1016/S0002-8703(00)90077-2. PMID 10689248.