Table 1.

Temperature sensitivity of alternans and functional parameters

	Intracellular Ca2+ Alternans		APD Alternans
	Q10	R2	Q10	R2
PCLC, ms	4.13	1.00*	2.25	1.00*
PCLD, ms	4.49	1.00*	2.14	1.00*
MCL, ms	1.75	0.78	1.61	0.96
APD/CTD, ms	1.40	0.94	1.41	0.70

Q₁₀ values were determined from a linear regression of Eq. 2.

^*Only two temperature conditions [room temperature (RT) and cold temperature (CT)] were used for this calculation, so the linear regression, by definition, will be a “perfect fit.” APD, action potential duration; PCL_C and PCL_D, spatially concordant and spatially discordant alternans onset pacing cycle length, respectively; MCL, minimum cycle length for loss of 1:1 or 2:2 capture.