Blood Pressure and Heart Rate Variability to Detect Vascular Dysregulation in Glaucoma

Table 1

Description of parameters calculated by time domain analysis. Parameters were calculated for heart rate and systolic and diastolic blood pressure.

Method	Parameter	Description
Time domain	MEANNN	Mean value of all NN intervals
	SDNN	Standard deviation of all NN intervals
	CVNN	Coefficient of variation of all NN intervals
	SDANN1	Standard deviation of the averages of NN intervals in all 1-minute segments of the entire recording
	SDANN5	Standard deviation of the averages of NN intervals in all 5-minute segments of the entire recording
	SDANN10	Standard deviation of the averages of NN intervals in all 10-minute segments of the entire recording
	RMSSD	Square root of the mean squared differences of successive NN intervals
	PNN50	Proportion derived by dividing the number of interval differences of successive NN intervals greater than 50 ms by the total number of NN intervals
	PNN100	Proportion derived by dividing the number of interval differences of successive NN intervals greater than 100 ms by the total number of NN intervals
	PNN200	Proportion derived by dividing the number of interval differences of successive NN intervals greater than 200 ms by the total number of NN intervals
	PNNL10	Portion of NN interval differences <10 ms in all NN intervals
	PNNL20	Portion of NN interval differences <20 ms in all NN intervals
	PNNL30	Portion of NN interval differences <30 ms in all NN intervals
	PNNL50	Portion of NN interval differences <50 ms in all NN intervals
	RENYI2	Renyi entropy of the histogram with (order) alpha = 2
	RENYI4	Renyi entropy of the histogram with alpha = 4
	RENYI025	Renyi entropy of the histogram with alpha = 0.25
	SHANNON	Shannon entropy of the histogram