TABLE 1.

Diversity and incidence of calcium instability patterns

N:M	1	2	3	4	5	6	7	8
1		27	7	1
		0.8 ± 0.1 Hz	0.9 ± 0.1 Hz	0.5 Hz
2	47	35	7		3
	3.4 ± 0.2 Hz	3.9 ± 0.3 Hz	1.1 ± 0.2 Hz		0.8 ± 0.2 Hz
3	8	18	6	1
	6 ± 1 Hz	2.8 ± 0.2 Hz	2.3 ± 0.4 Hz	3 Hz
4	4	1	7
	6 ± 1.7 Hz	8 Hz	3 ± 0.4 Hz
5				6
				3.5 ± 0.2 Hz
6		1			2	1
		3 Hz			3 Hz	4 Hz
7						3	1
						5 ± 2 Hz	4 Hz
8							1
							9 Hz
9				1				1
				3 Hz				9 Hz

Diagonal terms, represented in regular roman type, indicate N = M > 1 patterns of alternans and higher-order periodicities; terms represented in italic type indicate extra beats (N < M); terms represented in bold print indicate skipped beats and blocks (N > M). Numbers in the corresponding cells indicate the number of observations and the average stimulation frequency at which the patterns were observed.