Table 1.

Venous diameter (mm, mean ± s.e. mean) recorded following the administration of systemic treatments and during the infusion of saline (‘baseline’), phenylephrine hydrochloride solution (‘preconstriction’), and phenylephrine hydrochloride + six different doses of isoprenaline hydrochloride (1–6). See text for details.

			Phenylephrine+isoprenaline
	Saline	Phenylephrine	1	2	3	4	5	6
Placebo	0.73 ± 0.11	0.19 ± 0.05	0.22 ± 0.05	0.26 ± 0.05	0.34 ± 0.06	0.44 ± 0.07	0.52 ± 0.08	0.59 ± 0.09
Bisoprolol 5 mg	0.76 ± 0.07	0.24 ± 0.05	0.28 ± 0.06	0.32 ± 0.05	0.36 ± 0.05	0.43 ± 0.07	0.52 ± 0.07	0.62 ± 0.07
Nadolol 40 mg	0.78 ± 0.11	0.14 ± 0.03	0.14 ± 0.03	0.17 ± 0.04	0.23 ± 0.04	0.31 ± 0.07	0.38 ± 0.07	0.47 ± 0.09