Circadian variation in human ventricular fibrillation (VF) dominant frequency is unknown. If present this would provide evidence of physiological influence on VF. The objective was to quantify the circadian variation in human VF dominant frequency.
Eight-lead Holter ECG recordings were obtained from a patient with severe myocarditis and chronic VF who was supported by a biventricular assist device. Recordings of up to 24h duration were obtained on 6 days with an average interval between recordings of 7 days. Dominant frequency and amplitude were obtained using spectral analysis and assessed for (i) circadian (ii) inter-recording and (iii) inter-lead differences.
There was a significant circadian variation in amplitude (night: 0.027±0.004mVHz vs day: 0.044±0.006mVHz, p0.05). There were significant differences between recordings in dominant frequency which ranged from 6.80±0.29Hz to 8.36±0.38Hz (p
Langley, P., MacGowan, G. A., & Murray, A. (2010). Circadian variation of human ventricular fibrillation dominant frequency. Resuscitation, 81(8), (950-955). doi:10.1016/j.resuscitation.2010.03.026. ISSN 0300-9572