Table 4

Maximal relaxant effect of isoprenaline in different canine veins

VeinMaximal Relaxation in % of Previous Contraction
External jugular86
Cephalic91
Azygos93
Pulmonary88
Inferior vena cava
 High segment91
 Low segment13
Portal25
Mesenteric17
Splenic85
Renal89
Femoral82
Lateral saphenous91
  • Vein strips were precontracted with methoxamine (5 μM) (Furuta et al., 1986).