title: Increased wall tension in response to vasoconstrictors in isolated mesenteric arterial rings from patients with high blood pressure.
abstract: Essential hypertension is associated with several alterations in arterial function. A wealth of information from animal models is available concerning hypertensive changes in the mesenteric circulation, while only few studies have examined human mesenteric arterial function. The tone of isolated mesenteric arterial segments (outer diameter 0.7-0.9 mm) was examined from individuals with high (n=17) or normal (n=22) blood pressure, grouped using the current definition of elevated blood pressure (140/90 mmHg). Since the majority of them were operated because of malignancies, we evaluated whether functional vascular properties provided information about patient prognosis. Wall tension development (mN/mm) in response to vasoconstrictors (noradrenaline, 5-hydroxy tryptamine, potassium chloride) was higher in mesenteric arterial rings from patients with high than normal blood pressure. There was no difference in vasoconstrictor sensitivity, or endothelium-dependent and endothelium-independent vasorelaxation. Arterial segment weight was higher in hypertensive subjects, suggesting vascular wall hypertrophy. The 10-year follow-up showed no differences in the control of arterial tone between the surviving (n=14) or deceased (n=25) patients. In conclusion, isolated mesenteric arterial segments from hypertensive patients showed increased wall tension in response to vasoconstrictors. Since the mesenteric circulation is an important regulator of peripheral arterial resistance, possible functional alterations in this vascular bed should be further investigated in hypertensive patients.
authors.affiliation: Department of Internal Medicine, University of Tampere, 33014 University of Tampere, Tampere, Finland.
authors.forename: Anna
authors.initials: A
authors.lastname: Tahvanainen
authors.forename: Jyrki
authors.initials: J
authors.lastname: Taurio
authors.forename: Jenni
authors.initials: J
authors.lastname: Mäki-Jouppi
authors.forename: Peeter
authors.initials: P
authors.lastname: Kööbi
authors.forename: Jukka
authors.initials: J
authors.lastname: Mustonen
authors.forename: Mika
authors.initials: M
authors.lastname: Kähönen
authors.forename: Juhani
authors.initials: J
authors.lastname: Sand
authors.forename: Isto
authors.initials: I
authors.lastname: Nordback
authors.forename: Ilkka
authors.initials: I
authors.lastname: Pörsti
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004008:Diclofenac / Q000494:pharmacology; D005260:Female; D006801:Humans; D006973:Hypertension / Q000503:physiopathology*; D066298:In Vitro Techniques; D008297:Male; D008638:Mesenteric Arteries / Q000187:drug effects* / Q000502:physiology / Q000503:physiopathology; D008875:Middle Aged; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D009543:Nifedipine / Q000494:pharmacology; D009638:Norepinephrine / Q000494:pharmacology; D011189:Potassium Chloride / Q000494:pharmacology; D012701:Serotonin / Q000494:pharmacology; D014661:Vasoconstriction / Q000187:drug effects; D014662:Vasoconstrictor Agents / Q000494:pharmacology*
chemical_list: D014662:Vasoconstrictor Agents; D004008:Diclofenac; D012701:Serotonin; D011189:Potassium Chloride; D009543:Nifedipine; D019331:NG-Nitroarginine Methyl Ester; D009638:Norepinephrine