Optimal Length of Heart Rate Variability Data and Forecasting Time for Ventricular Fibrillation Prediction Using Machine Learning

Table 1

Features extracted from the HRV, the QRS complex singed area, and the R-peak amplitude.

Component	Analysis	Feature	Unit	Description
HRV	Time-domain analysis	Mean NN	ms	Mean of normal R-peak to normal R-peak (NN) interval
		RMSSD	ms	Square root of the mean squared differences of successive NN intervals
	Poincare nonlinear analysis	SD1	ms	Standard deviation of points perpendicular to the axis of the line of identity
		SD2	ms	Standard deviation of points along the axis of the line of identity,
		SD1/SD2		Ratio of SD1 over SD2