RESUMEN
Many patients suffer from sensorimotor deficits that may contribute to burn injury. This retrospective study examines burn injuries in the subgroup of patients that suffer from the early onset neurological impairments of mental retardation, cerebral palsy, spina bifida, autism, and attention deficit-hyperactivity disorder. Fifty-one patients who suffered from the above-mentioned early-onset neurological impairments were admitted to our burn center during a 4-year period. The average TBSA burned was 8.9% yet resulted in prolonged hospitalizations. This study describes our burn center's experience in treating patients admitted with early-onset neurological impairments.
Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad/complicaciones , Trastorno Autístico/complicaciones , Quemaduras/epidemiología , Parálisis Cerebral/complicaciones , Discapacidad Intelectual/complicaciones , Disrafia Espinal/complicaciones , Adolescente , Adulto , Superficie Corporal , Quemaduras/etiología , Estudios de Casos y Controles , Femenino , Humanos , Tiempo de Internación/estadística & datos numéricos , Masculino , Sistema de Registros/estadística & datos numéricos , Estudios Retrospectivos , Factores de RiesgoRESUMEN
BACKGROUND: Recent characterization of prostaglandin receptor subtypes shows that each is critical to cellular functions and operates through separate signaling pathways that may explain differing effects of prostanoids. This study aimed to determine whether prostaglandin receptors EP2 and EP4 are modulated after injury and to evaluate the effect of prostaglandin E(2) (PGE(2)) addition and blockade on EP receptor expression. METHODS: Peripheral blood mononuclear cells (PBMCs) isolated from 10 patients sustaining fracture or burn injury and 10 control subjects were stimulated with lipopolysaccharide +/- NS-398, an inhibitor of PGE(2) production. Samples were evaluated for production of PGE(2), tumor necrosis factor--alpha, and leukotriene B(4) as well as mRNA expression of EP receptors and COX-2. EP receptor expression was also evaluated after treating control PBMCs with PGE(2). RESULTS: PBMCs from injured patients exhibited significant increases in PGE(2) production and COX-2 mRNA compared with control subjects, and these increases were inhibited by NS-398. In contrast, EP2 and EP4 receptors were markedly down-regulated after injury and NS-398 restored expression to control levels. Decreased EP2 and EP4 receptor expression after injury was replicated by coincubation of PBMCs with PGE(2). CONCLUSIONS: Specific PGE(2) receptors are down-regulated after injury and NS-398 reverses this response. Furthermore, PGE(2) mediates EP2 and EP4 down-regulation. These data suggest that specific EP receptor subtypes may provide critical targets for augmenting the immune response after injury in humans.
Asunto(s)
Quemaduras/inmunología , Fracturas Óseas/inmunología , Leucocitos Mononucleares/inmunología , Receptores de Prostaglandina E/genética , Adulto , Anciano , Quemaduras/metabolismo , Ciclooxigenasa 2 , Inhibidores de la Ciclooxigenasa 2 , Inhibidores de la Ciclooxigenasa/farmacología , Dinoprostona/análisis , Dinoprostona/biosíntesis , Regulación hacia Abajo/efectos de los fármacos , Regulación hacia Abajo/inmunología , Femenino , Fracturas Óseas/metabolismo , Expresión Génica/efectos de los fármacos , Expresión Génica/inmunología , Humanos , Técnicas In Vitro , Isoenzimas/genética , Leucocitos Mononucleares/metabolismo , Leucotrieno B4/análisis , Leucotrieno B4/biosíntesis , Receptores de Lipopolisacáridos/genética , Lipopolisacáridos/farmacología , Masculino , Proteínas de la Membrana , Persona de Mediana Edad , Nitrobencenos/farmacología , Prostaglandina-Endoperóxido Sintasas/genética , ARN Mensajero/análisis , Receptores de Prostaglandina E/inmunología , Receptores de Prostaglandina E/metabolismo , Subtipo EP2 de Receptores de Prostaglandina E , Subtipo EP4 de Receptores de Prostaglandina E , Transducción de Señal/inmunología , Sulfonamidas/farmacología , Factor de Necrosis Tumoral alfa/análisis , Factor de Necrosis Tumoral alfa/biosíntesisRESUMEN
Contact with hot oven doors is an important cause of burns in pediatric patients. These burns are of particular concern because of their frequent localization to the hands, with the resulting negative implications for financial cost, long-term cosmesis, and hand function. A 5-year review of pediatric oven door burn cases admitted to a burn referral center was conducted. Of the 14 cases identified, the median age was 12 months. The median total body surface area (TBSA) was 1.75% (range, 0.5%-4.5%). Twelve of 14 cases involved 1 or both hands. The median length of hospital stay was 10 days. In 7 cases, burns were sustained from contact to an external surface of the oven. Based on the results obtained, we propose several prevention strategies.
Asunto(s)
Accidentes Domésticos/estadística & datos numéricos , Quemaduras/etiología , Protección a la Infancia/estadística & datos numéricos , Culinaria/instrumentación , Accidentes Domésticos/prevención & control , Accidentes Domésticos/tendencias , Distribución por Edad , Superficie Corporal , Quemaduras/clasificación , Quemaduras/epidemiología , Quemaduras/prevención & control , Protección a la Infancia/tendencias , Preescolar , Costo de Enfermedad , Femenino , Hospitalización/estadística & datos numéricos , Hospitalización/tendencias , Humanos , Lactante , Tiempo de Internación/estadística & datos numéricos , Tiempo de Internación/tendencias , Masculino , New York/epidemiología , Padres/educación , Vigilancia de la Población , Derivación y Consulta/estadística & datos numéricos , Derivación y Consulta/tendencias , Estudios Retrospectivos , Factores de Riesgo , Distribución por SexoRESUMEN
Major burns among food service workers appears to be an underappreciated source of morbidity and public expense in New York City. A retrospective study was conducted to identify workers requiring hospital admission over the past 3 years. Seventy-six restaurant workers (3.8% of all adult admissions) were identified. They averaged 33 years of age, and sustained burns with a mean %TBSA of 12.5, resulting in a mean length of stay of 12.8 days. Scalds predominated, with water/coffee burns most common (n = 29), followed by oil (n = 27), and soup/sauce burns (n = 12). Burns to the extremities occurred in 97% of patients. Surgery was required in 32 of 76 patients (42.1%). Oil burns were more likely to require surgery than aqueous scalds (59 vs 34%; P < 0.01). Hospitalization expenses averaged $1.13 million dollars per year. There were no mortalities. Restaurant-related major burns are a frequent occurrence, particularly scald injuries. Hospital care and further disability result in enormous publicly funded expenses. The morbidity and lost wages are a severe detriment to workers and their families. Greater public health awareness measures are warranted.
Asunto(s)
Quemaduras/epidemiología , Salud Pública/estadística & datos numéricos , Restaurantes/estadística & datos numéricos , Piel/lesiones , Adolescente , Adulto , Anciano , Unidades de Quemados/economía , Unidades de Quemados/estadística & datos numéricos , Quemaduras/economía , Quemaduras/terapia , Femenino , Costos de Hospital/estadística & datos numéricos , Hospitalización/economía , Hospitalización/estadística & datos numéricos , Hospitales Universitarios/economía , Hospitales Universitarios/estadística & datos numéricos , Humanos , Tiempo de Internación/economía , Tiempo de Internación/estadística & datos numéricos , Masculino , Persona de Mediana Edad , Ciudad de Nueva York/epidemiología , Salud Laboral/estadística & datos numéricos , Salud Pública/economía , Restaurantes/economía , Estudios Retrospectivos , Índices de Gravedad del TraumaRESUMEN
OBJECTIVE: Previous studies have suggested that burn blister fluid (BBF) may be detrimental to the healing of the underlying wound bed. In this study, the effects of burn blister fluid on cultured keratinocyte proliferation and differentiation were examined and quantitated using various techniques. METHODS: At three different concentrations (2%, 10%, 20% in 20% fetal bovine serum/complete culture medium), 19 BBFs were tested in triplicate using 12 populations of cultured keratinocytes. All BBFs were collected from partial thickness burns within 72 hours of injury,. BBF was added on day 4 of the keratinocyte culture. The effect on proliferation and viability was assessed using trypan blue dye exclusion. Multiparameter flow cytometric analysis was used to quantitate population kinetics and cell size distribution. Keratinocyte differentiation was determined using immunohistochemical staining of differentiation markers and quantitation of cornified envelope formation. RESULTS: Relative to control fluid, the BBF caused a variable effect on proliferation, ranging from 67% inhibition to 103% stimulation with an overall 4% inhibition. The range of keratinocyte viability was narrower, with a similar overall 4% reduction. Using flow cytometry to analyze RNA/DNA content and cell size, the BBF caused a subtle shift in keratinocyte population kinetics and cell size distribution toward larger, less rapidly dividing cells. The BBF had no significant effect on expression of the differentiation markers, filaggrin and involucrin. Finally, the BBF did not alter terminal differentiation as it did not influence formation of cornified envelopes (BBF = 9.1 +/- 4.8%, control = 9.9 +/- 6.6%). CONCLUSION: Previous biochemical analysis has shown that BBF consists primarily of human serum filtrate with locally produced acute reactants. Our study suggests that BBF is biologically similar to serum and does not significantly alter keratinocyte proliferation or differentiation in vitro.
Asunto(s)
Vesícula/fisiopatología , Quemaduras/fisiopatología , Exudados y Transudados/fisiología , Queratinocitos/fisiología , Cicatrización de Heridas/fisiología , Adolescente , Adulto , Anciano , Recuento de Células , Diferenciación Celular , División Celular , Tamaño de la Célula , Células Cultivadas , Niño , Femenino , Proteínas Filagrina , Citometría de Flujo , Humanos , Masculino , Persona de Mediana EdadRESUMEN
Medical and demographic data for trauma patients (n = 7120) admitted to 12 trauma centers in 1 year were reviewed. Data from New York State on all discharges for the same year (n = 2,535,501) were obtained and analyzed. Patients were identified as trauma patients based on NYC EMS trauma center advisory committee criteria translated into ICD-9-CM codes, and a computer-based algorithm was developed that identified 43,219 trauma patients. A standard resource cost (SRC) was also developed to compare relative cost among trauma and non-trauma patients in the same diagnosis-related groups (DRGs). The mean age of the 43,219 trauma patients was 43.1 years, 61.8% were male, the mean LOS was 13.4 days, the mean ISS was 10.4, and 61% were discharged from community hospitals. Trauma centers treated the more severely injured patients: mean ISSs were 12.3, 10.9, and 9.2 for level I, level II, and community hospitals, respectively. Payor mix varied by category, with 71% of penetrating trauma victims covered by Medicaid or self pay compared with 21% of blunt trauma victims. Level I centers treated twice as many self-pay and Medicaid patients as community hospitals. A comparison of relative cost showed that trauma patients cost 27.5 million dollars more than non-trauma patients in the same DRGs.
Asunto(s)
Costo de Enfermedad , Heridas y Lesiones/economía , Heridas y Lesiones/terapia , Adulto , Algoritmos , Demografía , Grupos Diagnósticos Relacionados , Femenino , Humanos , Puntaje de Gravedad del Traumatismo , Reembolso de Seguro de Salud , Tiempo de Internación , Masculino , Medicaid , Persona de Mediana Edad , New York , Centros Traumatológicos/economía , Estados Unidos , Heridas y Lesiones/clasificaciónRESUMEN
It should be clear from this overview of triage, assessment, and initial care that early involvement by the leader of the trauma team is essential. Because operative intervention is so often necessary, the trauma team leader should be a surgeon with specialized training in trauma. The complex decision-making process involves prioritizing approaches by emergency room physicians, pediatricians, and surgical specialties in patients with multiple injuries. Even with single-system injury a rapid and logical approach to assessment and treatment is necessary in light of an overall longer term management plan.
Asunto(s)
Medicina de Emergencia , Pediatría , Triaje , Heridas y Lesiones/diagnóstico , Heridas y Lesiones/terapia , Niño , Humanos , Resucitación , Índices de Gravedad del TraumaRESUMEN
Complete rectal prolapse or procidentia is an uncommon condition long recognized but of uncertain pathogenesis. We report two patients, seen a decade apart, both of whom developed complete rectal prolapse after ingestion of oral cathartics in preparation for diagnostic studies. To our knowledge, cathartic-induced complete rectal prolapse has not been reported previously in the current medical literature, despite the thousands of bowel preparations performed annually. These two cases address the implications of such an occurrence, and we discuss the pertinent management issues.
Asunto(s)
Catárticos/efectos adversos , Prolapso Rectal/inducido químicamente , Anciano , Citratos/efectos adversos , Ácido Cítrico , Colonoscopía , Electrólitos/efectos adversos , Femenino , Humanos , Polietilenglicoles/efectos adversos , Soluciones , UrografíaRESUMEN
Endotoxin, a lipopolysaccharide (LPS), is a bacterial cell wall product instrumental in producing deleterious host responses to infection. This LPS appears to act, in part, by triggering release of endogenous mediators such as cytokines. Repeated exposures to endotoxin produce attenuated responses to this molecule. To examine the mechanisms and biologic consequences of this tolerance to LPS, Wistar rats were subjected to a 14-day course of LPS administration. Tolerance to LPS with regard to anorexia, weight loss, and acute-phase responses was noted. Attenuation of these physiologic responses was accompanied by abrogation of circulating cytokine appearance in response to endotoxin, suggesting that tolerance to LPS is in part due to a decreased production of cytokines. Tolerance to LPS also diminished the response to a subsequent infected thermal injury, as measured by food intake, body weight, fibrinogen levels, and mortality. Thus, clinical conditions involving repeated exposure to LPS may modify the host's responses to subsequent injury. The attenuated responses to injury accompanying the decreased production of cytokines further implicate cytokines in the pathogenesis of injury and disease.
Asunto(s)
Quemaduras/inmunología , Endotoxinas/toxicidad , Interleucina-6/biosíntesis , Factor de Necrosis Tumoral alfa/biosíntesis , Infección de Heridas/inmunología , Reacción de Fase Aguda , Animales , Quemaduras/complicaciones , Ingestión de Alimentos , Endotoxinas/sangre , Fibrinógeno/análisis , Hematócrito , Recuento de Leucocitos , Masculino , Ratas , Ratas Endogámicas , Aumento de PesoRESUMEN
To assess the effect of diagnosis related group (DRG) changes on reimbursement for trauma care in New York State (NYS), 840 trauma patients were studied over a 2-year period. Average costs increased moderately ($10,338 vs. $11,646) while average revenues increased dramatically ($6,934 vs. $9,115), leading to a 21% reduction in operating losses ($1,310,625 vs. $1,032,733). This was largely a result of new multiple significant trauma (MST) DRGs. The impact of 1990/1991 DRG changes was assessed; a 39% reduction in operating losses occurred. Regression analysis of 1989 DRG case weight on cost indicated that MST DRGs were better predictors of resource utilization than other trauma DRGs. Review of NYS data affirmed that only 10% of trauma patients were assigned MST DRGs and 63% of trauma patients were discharged from community hospitals. On a national level, the effect of the new Medicare MST DRGs would be minimal, since only 5% of Medicare patients were assigned MST DRGs. Although improvements have been made, reimbursement for trauma care must be addressed further.
Asunto(s)
Grupos Diagnósticos Relacionados , Traumatismo Múltiple/clasificación , Sistema de Pago Prospectivo , Adolescente , Adulto , Niño , Humanos , Reembolso de Seguro de Salud , Medicare , Traumatismo Múltiple/economía , New York , Acampadores DRG , Análisis de Regresión , Estados UnidosRESUMEN
Previous studies have demonstrated that human malignancies can synthesize large amounts of thromboxane. It has also been reported that thromboxane can significantly alter multiple components of physiologic and immunologic function. We investigated the effect of elevated levels of thromboxane on host response to tumor using multiple rat models, and the long acting thromboxane analogue U-46619. Administration of the thromboxane analogue was not found to significantly alter the growth of primary tumors or peritoneal metastases. The analogue was found to significantly decrease mean survival time with a pulmonary metastases model. The thromboxane analogue failed to alter macrophage cytotoxicity, lymphocyte cytotoxicity, T lymphocyte subset numbers, or lymphocyte blastogenic response. Administration of the thromboxane analogue decreased the rate of lymphocyte metabolism of glucose and decreased lymphocyte intracellular adenosine deaminase activity. In conclusion, elevated thromboxane levels do not appear to alter primary tumor growth or host immune function, but do decrease resistance to pulmonary metastases.
Asunto(s)
Neoplasias del Colon/inmunología , Fibrosarcoma/inmunología , Endoperóxidos de Prostaglandinas Sintéticos/farmacología , Tromboxanos/fisiología , Ácido 15-Hidroxi-11 alfa,9 alfa-(epoximetano)prosta-5,13-dienoico , Animales , Humanos , Inmunidad Celular/efectos de los fármacos , Inmunidad Innata/efectos de los fármacos , Células Asesinas Naturales/efectos de los fármacos , Linfocitos Infiltrantes de Tumor/efectos de los fármacos , Masculino , Trasplante de Neoplasias , Ratas , Ratas Endogámicas F344 , Ratas Endogámicas WF , Subgrupos de Linfocitos T/efectos de los fármacosRESUMEN
Prostaglandin E (PGE) is produced by certain tumors and is reported to decrease primary tumor growth. We evaluated its effect in multiple tumor models utilizing a 1 week course of the long acting PGE derivative dimethyl-PGE (dPGE) at a dosage of 100 micrograms/kg/day vs. a lactated Ringers control. For all tumor models, a suspension of 1 x 10(6) colon carcinoma cells were injected into Wistar-Furth rats. When the suspension was injected subcutaneously and the drug was begun at the time of tumor challenge, there was no effect on survival. When the tumor was injected intraperitoneally or intravenously and the drug begun at the time of tumor challenge, dPGE decreased survival time. When the tumor was administered intravenously but dPGE was delayed for 5 days, there was no effect on survival time. When rats were given a 1 week course of dPGE or saline, dPGE was found not to alter natural killer (NK) cell cytotoxicity, macrophage cytotoxicity, spontaneous lymphocyte blastogenesis, or mitogen stimulated blastogenesis. dPGE failed to alter lymphocyte metabolism of glucose in nonstimulated lymphocytes, but decreased the rate of glucose metabolism and adenosine deaminase activity in mitogen stimulated lymphocytes. In conclusion, PGE appears to enhance metastatic growth of tumor lines where it does not alter primary tumor growth. This effect does not appear immunologically mediated.
Asunto(s)
Metástasis de la Neoplasia/inmunología , Neoplasias Experimentales/inmunología , Prostaglandinas E/farmacología , Animales , Supervivencia Celular/efectos de los fármacos , Modelos Animales de Enfermedad , Glucosa/metabolismo , Inmunidad Celular/efectos de los fármacos , Células Asesinas Naturales/efectos de los fármacos , Activación de Linfocitos/efectos de los fármacos , Linfocitos/efectos de los fármacos , Linfocitos/inmunología , Linfocitos/metabolismo , Masculino , Ácidos Nucleicos/metabolismo , Ratas , Ratas Endogámicas WF , Subgrupos de Linfocitos T/efectos de los fármacos , Células Tumorales CultivadasRESUMEN
Although hormones are putative mediators of neutrophil changes after injury, the effects of trauma-induced levels of plasma cortisol and epinephrine on circulating neutrophils have not been reported in humans. The dynamics of PMN mobilization and chemotaxis were evaluated during 19 infusions of epinephrine or cortisol or a combined infusion of both hormones in ten normal volunteers. Basal levels of epinephrine and cortisol increased during infusions to levels consistent with those reported following severe injury. Circulating neutrophil counts increased in parallel with plasma cortisol levels. Epinephrine mobilized the entire marginated pool of neutrophils, and the neutrophil half-life was extended from a normal of 6.6 hours to 10.4 hours by cortisol. Chemotaxis after six hours of epinephrine infusion was reduced compared with baseline chemotaxis. In four volunteers who had a second infusion of cortisol, chemotaxis was significantly depressed ten days after the infusion compared with baseline. From these data we conclude that stress levels of epinephrine mobilize the marginated pool of granulocytes into the circulating pool in a linear fashion, and cortisol raises the half-life of circulating neutrophils. Reduced neutrophil chemotaxis seen as a consequence of these infusions could account for some of the increased susceptibility to infection that occurs after major trauma.
Asunto(s)
Quimiotaxis de Leucocito/efectos de los fármacos , Epinefrina/administración & dosificación , Hidrocortisona/administración & dosificación , Neutrófilos/efectos de los fármacos , Quimioterapia Combinada , Epinefrina/farmacología , Humanos , Hidrocortisona/farmacología , Infusiones Intravenosas , Recuento de Leucocitos/efectos de los fármacos , Masculino , Neutrófilos/fisiologíaRESUMEN
Transfusions are reported to increase the incidence of tumor metastasis in clinical studies and primary tumor growth in animal studies. We evaluated the effect of transfusions on immunologic response to primary and metastatic tumors in multiple rat models. One half of the animals were administered lactated Ringer's solution and one half ACI rat blood at the time of tumor challenge. In 80 rats a slow-growing colon tumor was implanted subcutaneously. At 4 months there were no significant differences in tumor size or leukocyte infiltration of the tumor. Similar results were obtained with a rapidly growing colon cancer. Analysis of T-lymphocyte subpopulations in both groups showed no differences. Rats transfused at the time of intravenous challenge with a suspension of 1 x 10(6) tumor cells had a mean survival time of 38.3 +/- 0.8 days and the control group had a mean survival time of 41.1 +/- 0.8 days (p = 0.016). One week after transfusion, natural killer cell lysis of tumor cells at a 100:1 effector/target cell ratio was 18.0% +/- 1.8% in the transfusion group and 23.0% +/- 1.3% in the control group (p = 0.034). In conclusion, transfusions in multiple rat cancer models did not affect primary tumor growth or the host's immunologic response to it but did significantly impair natural killer cell function and survival with tumor metastases.
Asunto(s)
Transfusión Sanguínea , Neoplasias Experimentales/inmunología , Adenocarcinoma/inmunología , Adenocarcinoma/patología , Animales , Carcinoma/inmunología , Carcinoma/patología , Neoplasias del Colon/inmunología , Neoplasias del Colon/patología , Células Asesinas Naturales/fisiología , Masculino , Neoplasias Experimentales/mortalidad , Neoplasias Experimentales/patología , Estudios Prospectivos , Ratas , Ratas Endogámicas , Ratas Endogámicas WF , Análisis de Supervivencia , Neoplasias Torácicas/inmunología , Neoplasias Torácicas/patologíaRESUMEN
To assess the financial impact of the new all-payor prospective payment system (PPS), data for 430 patients admitted to a Level I Trauma Center were compared to all hospital discharges (n = 35,309). Trauma patients had a LOS of 13.1 days, average Trauma Score of 15, and operating loss for trauma patients totalled $1,310,625. Trauma as compared to all patients showed a greater variance in LOS (6.3 vs. 2.0 days), a higher case mix index (CMI) (1.93 vs. 1.40), and a greater loss per case (-$3,404 vs. -$979), respectively. The trauma group DRG weights correlated with revenue (r = 0.89; p less than 0.0001); however, there was no relation to profit/loss. Review of trauma patients' records revealed inaccurate coding. Corrections led to an increase in reimbursement of $132,000. Five DRGs were added in 1989 for multiple significant trauma (MST). Using the 1989 grouper, 30 patients were reassigned, with an increase in reimbursement of $250,000. Although these strategies reduce operating deficit by 29%, reimbursement for trauma care must be addressed further.
Asunto(s)
Grupos Diagnósticos Relacionados , Servicios Médicos de Urgencia/economía , Sistema de Pago Prospectivo , Heridas y Lesiones/economía , Costos y Análisis de Costo , Humanos , Tiempo de Internación , Registros Médicos , Ciudad de Nueva York , Centros Traumatológicos/estadística & datos numéricos , Heridas y Lesiones/terapiaRESUMEN
Leukotriene B4, a potent neutrophil chemotactic factor, is also made by the neutrophil. Neutrophil function was studied in 12 patients at risk for the development of adult respiratory distress syndrome (ARDS) after admission to the surgical intensive care unit (ICU) to test the hypothesis that increased generation by the neutrophil generation of this mediator precedes the development of pulmonary failure. Peripheral blood neutrophils were tested for chemotaxis to f-met-leu-phe (fMLP) and leukotriene B4 (LTB4) and the generation of LTB4. Plasma was collected simultaneously for assay of C3a desArg levels. Five patients had ARDS a mean of 2.2 +/- 0.25 days after admission to the ICU. Neutrophil generation of LTB4 was significantly enhanced on ICU day 1 in these patients as compared with patients at risk for ARDS but not developing the syndrome (119.4 +/- 6.1 versus 101.0 +/- 5.1, per cent control, p less than 0.05). Chemotaxis to fMLP and LTB4 was significantly reduced in both groups of patients. However, neutrophil chemotaxis improved in patients who did not have pulmonary failure during the time in the ICU, whereas neutrophil chemotactic responsiveness worsened in patients who did have pulmonary failure. Plasma C3a desArg levels were significantly elevated over normal laboratory values on ICU day 1 in the ARDS patients (317.2 +/- 74.0 versus 132.0 +/- 16.0 milligrams per milliliter, p less than 0.01). These data indicate that LTB4 production by the neutrophil occurs concomitantly with complement activation, is a predictor of subsequent ARDS and may play a significant role in the development of pulmonary failure in critically ill surgical patients.
Asunto(s)
Leucotrieno B4/biosíntesis , Síndrome de Dificultad Respiratoria/sangre , Procedimientos Quirúrgicos Operativos , Quimiotaxis de Leucocito , Activación de Complemento , Complemento C3a/metabolismo , Cuidados Críticos , Humanos , Lactoferrina/sangre , N-Formilmetionina Leucil-Fenilalanina , Neutrófilos/fisiología , Síndrome de Dificultad Respiratoria/inmunología , Síndrome de Dificultad Respiratoria/fisiopatologíaRESUMEN
Blood transfusions have been shown to be associated with increased bacterial infection rates in colon cancer patients and in multiple animal studies. This increased susceptibility appears due to impairments in the systemic resistance to infections and not to alterations in the local response. Specifically, transfusions in a rat model were not found to alter the peritoneal cavity's response to an Escherichia coli challenge or the burn wound's response to a Pseudomonas aeruginosa challenge. Transfusions did impair the macrophage's ability to phagocytose and kill bacteria. Transfusions also increased the serum level of the immunosuppressive glucocorticoid, corticosterone.
Asunto(s)
Infecciones Bacterianas/inmunología , Transfusión Sanguínea , Corticosterona/sangre , Macrófagos/inmunología , Fagocitosis , Análisis de Varianza , Animales , Quimiotaxis , Quimiotaxis de Leucocito , Infecciones por Escherichia coli/inmunología , Inmunoglobulina G/análisis , Masculino , Neutrófilos/inmunología , Infecciones por Pseudomonas/inmunología , Ratas , Ratas Endogámicas LewRESUMEN
We investigated the cause of the reduced leukotriene B4 (LTB4) production seen in neutrophils from patients with established adult respiratory distress syndrome compared with control neutrophils. Lymphocytes/monocytes from controls were found to synergistically enhance the amount of LTB4 produced when incubated with neutrophils. This synergistic effect was not seen in cells from patients with adult respiratory distress syndrome. Fatty-acid analysis of neutrophils from patients with adult respiratory distress syndrome and controls showed remarkable similarity in all quantities of fatty acids measured except for arachidonic acid, where there was a 22% reduction in patients' cells compared with controls. Assay of the rate of generation of LTB4 and its degradation product, 20-hydroxy LTB4, revealed that reduced LTB4 generation in patients' neutrophils was not due to increased degradation of LTB4 by hydroxylase enzymes. When the amount of LTB4 being generated per milliliter of whole blood was analyzed in the patients with adult respiratory distress syndrome and compared with controls, it was determined that the potential to generate LTB4 in patients in the intensive care unit was three to five times greater than in controls.
Asunto(s)
Leucotrieno B4/biosíntesis , Síndrome de Dificultad Respiratoria/sangre , Ácidos Grasos/metabolismo , Femenino , Humanos , Metabolismo de los Lípidos , Linfocitos/metabolismo , Masculino , Persona de Mediana Edad , Monocitos/metabolismo , Neutrófilos/metabolismoRESUMEN
A one-week time and motion study was conducted at a large urban hospital replicating a study performed in 1969 in the same hospital, allowing a longitudinal study of emergency room utilization to be reported. Despite a 36% increase in the number of emergency room patients over the 16-year period, the findings from both studies replicate many of the patterns previously reported. Over time, both length of stay and wait times to see physicians have increased, although the values are still well within the ranges found in the literature. As competition increases, hospitals and their emergency room managers will have to determine what constitutes acceptable visit and waiting times in order to compete effectively for emergency room "clientele." Studies such as this one serve as a foundation for hospitals to implement policy changes that will improve health care delivery, and, in fact, this institution has already implemented changes based on this study.