title: Changes in plasma catecholamine concentration during salinity manipulation and anaesthesia in the hagfish Eptatretus cirrhatus.
abstract: Plasma catecholamines were measured following surgery under anaesthesia and after exposing hagfish to 90 and 110% sea water (SW). Plasma noradrenaline (NA) concentration increased from a resting value of 7 to 818 nM l(-1) on anaesthesia. Plasma adrenaline (AD) did not change. NA concentrations also increased during volume depletion (110% SW), but to much lower values (26 nM l(-1 )at 100 min). AD concentrations were increased at 20 min, then fell. During volume loading (90% SW) NA fell, and AD increased to a maximum concentration of 511 nM l(-1) at 40 min (resting concentration 24 nM l(-1)). The data are consistent with a vasoconstrictory role for NA on central veins when venous pressures fall and a vasodilatory role for AD on volume expansion.
authors.affiliation: School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand.
authors.forename: J M
authors.initials: JM
authors.lastname: Foster
authors.forename: M E
authors.initials: ME
authors.lastname: Forster
mesh_terms: D000758:Anesthesia / Q000662:veterinary; D000779:Anesthetics, Local / Q000494:pharmacology; D000818:Animals; D001566:Benzocaine / Q000494:pharmacology; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D001810:Blood Volume / Q000187:drug effects / Q000502:physiology; D003243:Consciousness / Q000187:drug effects / Q000502:physiology; D004837:Epinephrine / Q000097:blood*; D006196:Hagfishes / Q000097:blood*; D006400:Hematocrit; D009638:Norepinephrine / Q000097:blood*; D009994:Osmolar Concentration; D012623:Seawater / Q000737:chemistry; D012965:Sodium Chloride / Q000032:analysis; D014661:Vasoconstriction; D014882:Water-Electrolyte Balance / Q000502:physiology
chemical_list: D000779:Anesthetics, Local; D012965:Sodium Chloride; D001566:Benzocaine; D009638:Norepinephrine; D004837:Epinephrine