{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,27]],"date-time":"2025-10-27T16:03:16Z","timestamp":1761580996015},"reference-count":63,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"1","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Hypertension"],"published-print":{"date-parts":[[1996,1]]},"abstract":"<jats:p>\n            <jats:italic>Abstract<\/jats:italic>\n            Vasovagal reflexes, such as hypotension and bradycardia, are induced by rapid hemorrhage and mimic neurocardiogenic reflexes in mammals. We examined the role of vasopressin in the neurocardiogenic responses to mild, rapid hemorrhage (1 mL\/100 g for 30 seconds) and severe hemorrhage (1 mL\/100 g body wt for 30 seconds repeated three times at 11-minute intervals) in homozygous Brattleboro and Long-Evans rats. Mild, rapid hemorrhage induced severe bradycardia and hypotension only in Long-Evans rats. Exogenous vasopressin (1.85 pmol\/kg per minute for 1 hour) restored both the bradycardic and hypotensive responses in Brattleboro rats. DDAVP, a vasopressin V\n            <jats:sub>2<\/jats:sub>\n            -receptor agonist (0.19 pmol\/kg per minute for 24 hours), did not affect the cardiovascular responses to hemorrhage in Brattleboro rats, although it maintained urine production within normal limits. However, OPC-31260 (21.6 \u03bcmol\/kg IV), a vasopressin V\n            <jats:sub>2<\/jats:sub>\n            -receptor antagonist, attenuated both the hypotensive and bradycardic responses to hemorrhage in Long-Evans rats. A vasopressin V\n            <jats:sub>1<\/jats:sub>\n            -receptor antagonist attenuated bradycardia and delayed the recovery of arterial pressure after hemorrhage but did not affect the hypotension that occurred immediately after hemorrhage in Long-Evans rats. Methylatropine also attenuated both the bradycardic and hypotensive responses induced by hemorrhage, but propranolol had no effect on the cardiovascular responses to hemorrhage in Long-Evans rats. The recovery of arterial pressure after repeated hemorrhage was less adequate in Brattleboro rats than in Long-Evans rats. Our results suggest that the neurocardiogenic responses to hemorrhage, especially hypotension, may be related to vasodilation induced by a V\n            <jats:sub>2<\/jats:sub>\n            -receptor\u2013mediated mechanism and by the vagal reflex, both of which are substantiated by the existence of vasopressin. The coexistence of V\n            <jats:sub>1<\/jats:sub>\n            - and V\n            <jats:sub>2<\/jats:sub>\n            -receptor mechanisms may be necessary for the hypotensive response to hemorrhage. We found that a V\n            <jats:sub>2<\/jats:sub>\n            -receptor antagonist attenuated the hypotension mediated by the so-called neurocardiogenic reflex.\n          <\/jats:p>","DOI":"10.1161\/01.hyp.27.1.136","type":"journal-article","created":{"date-parts":[[2012,6,12]],"date-time":"2012-06-12T00:53:46Z","timestamp":1339462426000},"page":"136-143","update-policy":"http:\/\/dx.doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":13,"title":["Role of Vasopressin in Neurocardiogenic Responses to Hemorrhage in Conscious Rats"],"prefix":"10.1161","volume":"27","author":[{"given":"Yutaka","family":"Imai","sequence":"first","affiliation":[{"name":"From the Second Department of Medicine, Tohoku University School of Medicine, Sendai, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Choong-Yong","family":"Kim","sequence":"additional","affiliation":[{"name":"From the Second Department of Medicine, Tohoku University School of Medicine, Sendai, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junichiro","family":"Hashimoto","sequence":"additional","affiliation":[{"name":"From the Second Department of Medicine, Tohoku University School of Medicine, Sendai, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Naoyoshi","family":"Minami","sequence":"additional","affiliation":[{"name":"From the Second Department of Medicine, Tohoku University School of Medicine, Sendai, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masanori","family":"Munakata","sequence":"additional","affiliation":[{"name":"From the Second Department of Medicine, Tohoku University School of Medicine, Sendai, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Keishi","family":"Abe","sequence":"additional","affiliation":[{"name":"From the Second Department of Medicine, Tohoku University School of Medicine, Sendai, Japan."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","reference":[{"key":"e_1_3_2_1_2","doi-asserted-by":"crossref","unstructured":"Mark AL Mancia G. 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