title: Effects of vasoactive substances on the neurovascular structures and microcirculation in the developing callus 10 and 15 days after bone injury.
abstract: The developing callus requires sufficient oxygen and substrate supply. Despite the importance of these processes, we have limited understanding of regulation of the callus microcirculation. We aimed to assess the role of vasoactive substances in the microcirculation of the callus in a gap osteotomy model in the rabbit detected by laser-Doppler flowmetry. The reactions were elicited with locally applied vasoactive substances: epinephrine (E), calcitonine-gene related protein (CGRP), substance P (SP), sodium nitroprusside (SNP) and Ebrantil (Ebr) on the 10th and 15th postoperative days. Changes of the circulatory parameters were compared to changes in the ipsilateral femoral bone marrow. Perfusion pressure, maximal change of the blood flow and 50% recovery time (50RT) of the flow reactions and peripheral micro vascular resistance (MVR) was calculated. Systemic blood pressure (BP) was measured directly with an arterial catheter. Reactive neurovascular structures, sensitive to neuropeptides and vasoactive substances, appear at a very early stage of callus formation. On the 10th postoperative day, 2/3 of the blood flow velocity of the intact tibia has already returned, and the values are higher on the 15th postoperative day than those of the intact tibia. The basal blood flow velocities (prior to administration of any substance) are significantly higher on the 15th postoperative day than on the 10th.
authors.affiliation: Péterfy Hospital, Trauma Center, Budapest, Hungary. vendeghzsolt@gmail.com
authors.forename: Zsolt
authors.initials: Z
authors.lastname: Vendégh
authors.forename: András
authors.initials: A
authors.lastname: Melly
authors.forename: Balázs
authors.initials: B
authors.lastname: Tóth
authors.forename: Konrad
authors.initials: K
authors.lastname: Wolf
authors.forename: Tamás
authors.initials: T
authors.lastname: Farkas
authors.forename: István
authors.initials: I
authors.lastname: Kádas
authors.forename: János
authors.initials: J
authors.lastname: Hamar
mesh_terms: D000818:Animals; D001783:Blood Flow Velocity / Q000187:drug effects; D002146:Bony Callus / Q000098:blood supply* / Q000187:drug effects; D015740:Calcitonin Gene-Related Peptide / Q000494:pharmacology; D002317:Cardiovascular Agents / Q000494:pharmacology*; D004837:Epinephrine / Q000494:pharmacology; D005260:Female; D017078:Laser-Doppler Flowmetry; D008833:Microcirculation / Q000187:drug effects*; D009599:Nitroprusside / Q000494:pharmacology; D010027:Osteotomy; D010879:Piperazines / Q000494:pharmacology; D011817:Rabbits; D013373:Substance P / Q000494:pharmacology; D013977:Tibia / Q000098:blood supply
chemical_list: D002317:Cardiovascular Agents; D010879:Piperazines; D009599:Nitroprusside; D013373:Substance P; C015568:urapidil; D015740:Calcitonin Gene-Related Peptide; D004837:Epinephrine