Computation of Nonlinear Parameters of Heart Rhythm Using Short Time ECG Segments

Table 1

Means (standard deviations) of correlation dimension using different sampling times.

Sampling time	= 100 ms	= 125 ms	= 200 ms	= 250 ms
Embedding dimension	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
m = 1	0,943 (0,037)	0,943 (0,037)	0,939 (0,037)	0,941 (0,037)
m = 2	1,845 (0,111)^*	1,844 (0,105)^*	1,843 (0,099)^*	1,841 (0,105)^*
m = 3	2,66 (0,277)^*	2,69 (0,253)^*	2,708 (0,222)^*	2,724 (0,228)^*
m = 4	3,448 (0,425)^*	3,525 (0,29)^*	3,511 (0,284)^*	3,499 (0,308)^*
m = 5	4,14 (0,462)^*	4,244 (0,512)^*	4,235 (0,462)^*	4,178 (0,493)^*
m = 6	4,57 (0,561)^*	4,736 (0,518)^*	4,628 (0,752)^*	4,645 (0,684)^*
m = 7	4,857 (0,888)^*	4,992 (0,777)^*	5,101 (0,808)^*	4,981 (0,783)^*
m = 8	4,992 (0,771)^*	5,177 (0,992)^*	5,163 (0,992)^*	5,321 (0,875)^*
m = 9	4,922 (0,814)	5,264 (0,925)	5,193 (0,986)	5,304 (1,023)
m = 10	4,996 (0,083)	5,364 (0,931)	5,412 (1,054)	5,637 (1,147)
m = 11	5,051 (0,863)	5,451 (0,888)	5,62 (1,091)	5,575 (1,042)
m = 12	5,133 (0,814)	5,631 (0,826)	5,717 (0,962)	5,732 (1,153)
m = 13	5,18 (0,826)	5,741 (0,974)	5,889 (1,103)	5,847 (1,251)

Statistically significant changes with m from 1 to 13 (Scheffé’s test, P < 0.05).