RESUMEN
Spleen is highly vascularized organ and bleeding control during partial splenectomy is a big challenge. In this study conventional methods of electrocautery, absorbable suturing and advance methods of topical hemostat Surgicel® were compared to control bleeding during partial splenec- tomy. Twelve healthy dogs (n=4) were divided in A, B and C groups. After partial splenectomy Surgicel®, electrocautery and absorbable horizontal mattress sutures were used to control hemor- rhages in group A, B and C respectively. Bleeding time and loss of blood volume was evaluated during surgery. In addition, blood samples were taken on day 0 pre-surgery and on days 3, 10 and 17 post-surgery to evaluate changes in biochemical parameters after the application of dif- ferent hemostatic techniques. Ultrasonography was also performed at alternative days to check any gross changes in the spleen. Dogs in group A showed minimum bleeding time and loss of blood volume as compared to group B and C. Drop in red blood cells count was compared be- tween group A, B and C showing significant change (p≤0.05) at day 3, 10 and 17, while a sig- nificant decline in hemoglobin was found in group C followed by groups B and A at 3rd and 10th day. There was no difference between platelet counts in various groups. Ultrasonography showed no significant changes in the spleen parenchyma. It was concluded that Surgicel® was an effective material for controlling hemorrhage in veterinary patients.
Asunto(s)
Pérdida de Sangre Quirúrgica/veterinaria , Celulosa Oxidada/farmacología , Hemostasis Quirúrgica/veterinaria , Bazo/cirugía , Esplenectomía/veterinaria , Animales , Pérdida de Sangre Quirúrgica/prevención & control , Celulosa Oxidada/administración & dosificación , Enfermedades de los Perros , Perros , Hemostasis Quirúrgica/métodos , Hemostáticos/administración & dosificación , Hemostáticos/farmacología , Esplenectomía/métodosRESUMEN
Serotonin (5-HT) stimulates mitogenesis in rat renal mesangial cells through a G protein-coupled 5-HT(2A) receptor. We tested the hypothesis that oxidants might be involved in the signal transduction pathway linking the receptor to extracellular signal-regulated protein kinase (ERK). 5-HT rapidly increased the activity and phosphorylation of ERK. These effects were blocked by the 5-HT(2A) receptor antagonist ketanserin. The peak effect was noted at 5-10 min, and half-maximal stimulation was achieved at 10-30 nM 5-HT. Chemical inhibitor and activator studies supported the involvement of phospholipase C, protein kinase C (PKC), and reactive oxygen species (ROS, i.e., H(2)O(2) and superoxide) generated by an NAD(P)H oxidase-like enzyme in the ERK activation cascade. Mapping studies supported a location for the NAD(P)H oxidase enzyme and the ROS downstream from PKC. Our studies are most consistent with an ERK activation pathway as follows: 5-HT(2A) receptor --> G(q) protein --> phospholipase C --> diacylglycerol --> classical PKC --> NAD(P)H oxidase --> superoxide --> superoxide dismutase --> H(2)O(2) --> mitogen-activated extracellular signal-regulated kinase --> ERK. These studies demonstrate a role for the 5-HT(2A) receptor in rapid, potent, and efficacious activation of ERK in rat renal mesangial cells. They support a role for oxidants in conveying the stimulatory signal from 5-HT, because 1) chemical antioxidants attenuate the 5-HT signal, 2) oxidants and 5-HT selectively activate ERK to a similar degree, 3) 5-HT produces superoxide and H(2)O(2) in these cells, and 4) a specific enzyme [NAD(P)H oxidase] has been implicated as the source of the ROS, which react selectively downstream of classical PKC.
Asunto(s)
Mesangio Glomerular/metabolismo , Peróxido de Hidrógeno/metabolismo , Proteínas Quinasas Activadas por Mitógenos/metabolismo , Receptores de Serotonina/fisiología , Animales , Células Cultivadas , Activación Enzimática , Proteínas de Unión al GTP/efectos de los fármacos , Proteínas de Unión al GTP/fisiología , Mesangio Glomerular/citología , Proteínas Quinasas Activadas por Mitógenos/efectos de los fármacos , Fosforilación , Proteína Quinasa C/fisiología , Ratas , Ratas Sprague-Dawley , Especies Reactivas de Oxígeno/fisiología , Receptor de Serotonina 5-HT2A , Serotonina/farmacología , Fosfolipasas de Tipo C/fisiología , Factores de Virulencia de Bordetella/farmacologíaRESUMEN
A postal survey of all maternity units in the UK was conducted to gain information regarding the management of inadvertent dural taps occurring during the sitting of epidurals for pain relief in labour. Of the units surveyed only 58.5% had a written protocol for the management of dural taps. Following their occurrence, 99% of the units resited the epidural and in 22%, the midwives continued to give the top-ups. In only one-third of this latter group was the dose of the top-up reduced. In 46% of the units, patients who had a dural tap were allowed to push in the second stage of labour. As prophylaxis against the development of headache, 70% of the units infused crystalloids into the epidural space, whereas only 8.6% were in favour of an early prophylactic blood patch.