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Figure 1 Holter Report During Earthquake

(A and B) Heart rate variability 0 to 15 min before and 15 min after the earthquake, respectively. The histogram shows a decrease in the high-frequency (HF) zone and an increase in the low-frequency (LF)/HF ratio from 0.4 to 2.0. (C and D) A sudden increase in heart rate up to 160 beats/min and sinus tachycardia that persisted for 58 min. NU = normalized units; TP = total power; VLF = very low frequency. Reprinted, with permission, from Huang et al. (1).