Table 1

Characteristics of the patients and their atrial flutter

Patient		Age (years)		Sex		Associated heart disease or arrhythmia		AFL CL		aVF/IFW ratio		FW polarity
Patient		Age (years)		Sex		Associated heart disease or arrhythmia		CCW	CW	CCW	CW	CCW	CW
1	58	M	HCM	206	196	4.8	1.8	n	p
2	46	M	Atrial fibrillation	188	–	5.0	–	n	–
3	61	M		288	–	2.6	–	n	–
4	55	M	Atrial fibrillation	198	–	10.7	–	n	–
5	71	M	Atrial fibrillation	188	–	2.8	–	p	–
6	71	M		243	–	9.3	–	n	–
7	65	M	AVRT	–	200	–	1.2	–	e
8	64	F		196	–	11.5	–	n	–
9	45	M		219	–	4.7	–	n	–
10	62	F		223	–	4.6	–	n	–
11	22	M	AVNRT	–	206	–	1.6	–	p
12	43	M	Atrial fibrillation	228	–	3.6	–	n	–
13	34	M		213	–	3.4	–	e	–
14	39	M		217	–	3.5	–	n	–
15	53	M	Atrial fibrillation	–	205	–	0.9	–	p
16	45	F	AVNRT	–	212	–	2.2	–	p
17	61	M		208	211	6.0	0.9	e	e
18	46	F	AVRT, atrial tachycardia	245	223	3.9	2.1	n	p
19	68	M	Coronary artery disease	221	–	6.4	–	n	–
20	48	M	Sick sinus syndrome	–	237	–	1.0	–	p
21	69	M	HCM	198	–	3.8	–	e	–
22	67	M		221	221	5.4	1.3	n	p
23	62	M		241	–	4.5	–	n	–
24	46	M		218	206	8.0	1.4	n	p
25	78	M		207	–	11.7	–	e	–
26	45	M	Atrial septal defect	202	–	5.5	–	n	–
27	45	M		180	–	4.2	–	n	–
28	60	F		203	–	5.4	–	n	–
29	58	F		–	214	–	1.8	–	e
30	74	M		236	–	5.3	–	n	–
31	64	M	Atrial tachycardia	213	219	9.0	1.3	n	p
32	74	F	Atrial fibrillation	–	217	–	1.8	–	e
33	20	M		186	184	7.5	1.7	n	e
34	57	M		197	–	3.0	–	e	–
35	83	F	AVNRT	219	225	4.4	1.8	n	p
36	74	M	Coronary artery disease	204	248	4.8	1.7	n	n
37	44	M	Aortic regurgitation	237	237	5.3	1.4	n	e
Mean (SD)	56 (15)			215 (22)	215 (16)	5.7 (2.5)	1.5 (0.4)^1-150

↵1-150 p < 0.00001 compared with aVF/lead I flutter wave amplitude ratio in counterclockwise atrial flutter.
AFL, atrial flutter; AVNRT, atrioventricular nodal reentrant tachycardia; AVRT, atrioventricular reciprocating tachycardia; CCW, counterclockwise; CL, cycle length; CW, clockwise; e, equivocal; FW, flutter wave; HCM, hypertrophic cardiomyopathy; n, negative; p, positive.