Table 1

Characteristics and haemodynamic and pain responses of patients and controls

Subject	Age	Sex	Coronary arteries	ECG (rest)	ECG (dob)	HR (rest)	HR (dob)	SBP (rest)	SBP (dob)	DBP (rest)	DBP (dob)	RPP (rest)	RPP (dob)	Max dose dob	Pain score	Pain (LDD)
p=0.0001 v rest; p=0.0003 v rest; **p<0.0001 v normal controls. §p=0.0001 v rest; §§p=0.0002 v rest. DBP, diastolic blood pressure; dob, at peak effect of dobutamine infusion; F, female; HR, heart rate; LDD, low dose dolbutamine; M, male; non-spec, non-specific; RBBB, right bundle branch block; signif; significant; ⇓ST, ST segment depression; SBP, systolic blood pressure.
Syndrome X
1	62	M	Smooth, normal	Normal	⇓ ST V5,6	70	140	145	130	80	60	10 150	18 200	30	6	0
2	63	F	Smooth, normal	Normal	⇓ST II,V4-6	70	120	140	155	75	100	9800	18 600	25	9	0
3	47	F	Smooth, normal	Normal	⇓ST II, V4-6	70	120	130	145	70	100	9100	17 400	30	9	0
4	68	F	Smooth, normal	Normal	⇓ST II,III,aVF	66	140	155	190	90	100	11 220	26 600	25	9	0
5	71	F	Smooth, normal	Non-spec T	⇓ST V5, 6	60	87	120	153	60	95	7200	13 311	20	9	8
6	51	F	Smooth, normal	Normal	⇓ST II, III,V3-6	60	107	135	120	65	95	8100	12 840	25	8	3
7	52	F	Smooth, normal	Non-spec T	⇓ST II, III,V4-6	80	136	140	197	70	113	11 200	26 792	25	8	2
8	54	M	Smooth, normal	Normal	⇓ST V5,6	60	104	130	160	70	90	7800	16 640	45	3	0
Mean	59					67	119*	137	156	73	73	9321	18 798**	28	7.6***	1.6***
(SD)	(9)					(7)	(19)	(11)	(27)	(9)	(13)	(1531)	(5310)	(8)	(2.0)	(2.8)
Normal controls
1	61	M	–	Normal	Non-spec ST/T inf	84	120	114	116	77	75	9576	13 920	30	0	0
2	63	F	–	Partial RBBB	No signif change	66	108	120	138	63	94	7920	14 904	35	0	0
3	37	F	–	Normal	No signif change	85	136	110	117	67	59	10 120	15 912	30	0	0
4	54	F	–	Normal	No signif change	71	120	126	176	73	88	8946	21 120	30	1	0
5	63	F	–	Normal	Non-spec ST/T inf	58	120	159	198	74	88	9222	22 272	25	1	0
6	50	M	–	Normal	No signif change	52	80	186	231	118	101	9672	18 480	25	0	0
7	72	M	–	Normal	No signif change	70	119	206	169	89	74	14 420	20 111	25	0	0
8	51	F	–	Normal	No signif change	74	126	120	173	65	70	8880	21 798	25	0	0
Mean	56					70	116§	143	165	78	81	9033	17 060§§	28	0.25	0
(SD)	(4)					(12)	(17)	(37)	(40)	(18)	(14)	(1730)	(5394)	(4)	(0.46)