. Author manuscript; available in PMC: 2011 Oct 24.

Published in final edited form as: J Am Coll Cardiol. 2010 Sep 7;56(11):890–896. doi: 10.1016/j.jacc.2010.03.079

Table 2.

Association of Predominant Rhythm on Resting ECG and Exercise Testing with History of IART

Variable	n	History of IART	n	No History of IART	p-value^‡

		Mean±SD (median) or %		Mean±SD (median) or %
Predominant Rhythm on ECG	36		468		<.001
Atrial based rhythm		67%		87%
Junctional escape		3%		6%
Paced		31%		7%
Resting HR ^*	11	75.3±15.4 (80.0)	433	75.7±16.6 (75.0)	.87
Resting HR < 5^th percentile^*	11	27%	433	28%	1.00
Max HR, bpm^§	11	146±30 (152)	359	157±21 (160)	.31
%Predicted Max HR^§	11	71.2±14.6 (73.0)	359	75.7±10.1 (77.0)	.44
%Predicted Max HR<75^§	11	55%	359	41%	.37
P-axis, degrees^†	23	17.3±58.2 (40.0)	421	29.3±49.8 (38.0)	.54
P-axis 0 to 90^†	23	65%	421	77%	.21
Right Atrial Enlargement on ECG	27	7%	431	8%	1.00
Left Atrial Enlargement on ECG	27	26%	430	14%	.09

excluded patients with a paced rhythm and patients on heart rate medications

^§

excluded patients with rate-responsive pacemakers and patients on heart rate medications

^†

excluded patients with a paced or junctional rhythm

^‡

p-value is from Fisher exact test for categorical variables and Wilcoxon rank sum test for continuous variables

IART= Intraatrial Reentrant Tachycardia