The Journal of surgical research
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The management of severe hepatic trauma frequently involves exposing the liver to varying periods of warm ischemia. The ischemic tolerance of the liver, in the setting of hemorrhagic shock (HS) and trauma, is presently unknown. We tested the hypothesis that warm ischemic tolerance of the porcine liver will be decreased following resuscitation from HS. ⋯ The warm ischemic tolerance of the liver following resuscitation from HS is significantly decreased in this porcine model compared to HS or HI alone. Mortality was associated with acute intra-operative hemodynamic collapse occurring shortly after hepatic reperfusion.
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Comparative Study
Textile analysis of heavy weight, mid-weight, and light weight polypropylene mesh in a porcine ventral hernia model.
The purpose of this study was to assess the burst strength and stiffness of heavy weight (HW), mid-weight (MW), and light weight (LW) polypropylene mesh pre-implantation and 5 months post-implantation in a porcine ventral hernia model. ⋯ A reduction in mean burst strength and stiffness occurs after 5 months implantation of LW polypropylene mesh with an absorbable monofilament. All meshes exhibited burst strengths that were much greater than the burst strength of the abdominal wall fascia alone. After tissue incorporation, the LW polypropylene mesh maintains mean burst strength comparable to MW polypropylene mesh, while becoming less stiff than HW mesh. Long-term, this may contribute to more physiological abdominal wall compliance after LW polypropylene mesh implantation.
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Considering the renal effects of fluid resuscitation in hemorrhaged patients, the choice of fluid has been a source of controversy. In a model of hemorrhagic shock, we studied the early hemodynamic and renal effects of fluid resuscitation with lactated Ringer's (LR), 6% hydroxyethyl starch (HES), and 7.5% hypertonic saline (HS) with or without 6% dextran-70 (HSD). ⋯ Despite the immediate differences in hemodynamic responses, the low-volume resuscitation fluids, HS and HSD, are equally effective to LR and HES in restoring renal performance 120 min after hemorrhagic shock treatment.
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Comparative Study
Role of steroid administration to reduce inflammation after thoracotomy in a rat surgical stress model.
Unilateral lung surgical insult can lead to bilateral pulmonary inflammation after transthoracic esophagectomy for esophageal cancer. An inflammatory response of the cytokine network induced by surgical stress followed by neutrophil sequestration is the major mechanism involved in these complications. We examined modulation of the inflammatory cytokine and neutrophil sequestration by preoperative steroid administration in a rat thoracotomy model. ⋯ These data suggest that inflammatory changes induced by the unilateral operative procedure occur in both lungs through local inflammatory response. Pre-operative methylprednisolone administration down-regulates cytokine release and neutrophil sequestration, preventing lung edema, and possibly may act as a prophylactic treatment against acute lung injury caused by a so-called "second attack" theory.
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We hypothesized that resident fatigue error should improve, related to well-rested trainees as a direct cause/effect benefit. However, patient hospital care quality is multifactorial, so impact on patient care quality by changing only one variable for a single caregiver group was unknown. ⋯ Despite an expected perception of improvement in fatigue-related errors, most participants (particularly PR residents) reported impressions that patient care quality had remained unchanged or had declined under the work-hour restrictions. Unresolved challenges with continuity of care, miscommunication, and cross-coverage availability are possible explanations. Mere work-hour reduction does not appear to improve patient care quality automatically nor to decrease the possibility for some types of error. Process interventions that specifically target trainee sign-out coverage constraints as part of a global reassessment will be important for future attempts to enhance quality hospital patient care.