Hydrocortisone may act through the angiotensin II receptor-2 level in patients with catecholamine-resistant septic shock.

BACKGROUND: This study aimed to compare the serum angiotensin II and its receptor levels (AT1, AT2) in septic patients with catecholamine-responsive or resistant. The effect of hydrocortisone treatment on angiotensin II levels in the catecholamine-resistant septic patients was evaluated. METHODS: This prospective observational study enrolled 40 patients diagnosed with septic shock based on sepsis-3 criteria. Patients were divided into two groups according to the noradrenalin infusion rate required to keep the mean arterial pressure above 65 mmHg: control group and hydrocortisone group (control group: below 0.5 µg/kg/min, hydrocortisone group: above 0.5 µg/kg/min). Serum angiotensin II, AT1, AT2 levels were measured at the time of diagnosis (A), one hour after hydrocortisone treatment (B), and three days later (C). RESULTS: In the catecholamine-resistant group, angiotensin II and AT1 levels were higher than the catecholamine-responder group in all periods. The sensitivity and specificity of AT-1 was observed to be high in all periods. AT2 levels decreased after hydrocortisone treatment in the catecholamine-resistant group and cut-off value was found 11%. CONCLUSIONS: It was concluded that angiotensin II and AT1 can be used as a biomarker of refractory septic shock and hydrocortisone may provide their blood pressure correcting effect by reducing AT2 level in these patients. AT2 can be a therapeutic target in the catecholamine-resistant septic shock patients.

The initial response of a local hospital in the earthquake zone during the February 6, 2023 Kahramanmaras earthquakes: Injuries and challenges.

OBJECTIVE: This study aimed to describe the type and number of traumatic injuries seen after devastating earthquakes and to evaluate the difficulties experienced in the treatment process in a primary affected center. METHODS: Out of the 2176 patients who were treated in the emergency department, 372 (199 male and 173 female) patients with complete data were included in this single-center retrospective study. In addition to the demographic characteristics of the patients, orthopedic injuries, other organ system injuries, type of injury, treatments, mechanisms of injury, and time of presentation to the emergency department were recorded. RESULTS: The most common age group for injury was 20-30 years old, consisting of 73 patients (19.62%), and the second most common age group was between 40 and 50, with 72 patients (19.35%). Injury after being trapped under rubble was seen in 152 (40.86%) patients, while non-debris causes were more common in 220 patients (59.14%). The most common site of injury was in the lower extremities, with 111 patients (29.84%), while multiple injuries were seen in 109 patients (29.3%). Lower extremity fractures were mostly seen in long bones such as the femur (12.28%) and tibia (11.4%). Upper extremity fractures, especially those due to falls, were most frequently in the distal radius (8.77%). After triage, 117 patients (31.45%) were hospitalized, whereas the majority of patients (58.33%) were discharged from the emergency department. CONCLUSION: This study has shown us that injuries following major earthquakes are of a wide spectrum and occur in large numbers and in a very short time. Even in a well-equipped hospital that is not affected by an earthquake, there are many barriers to appropriate management. The first 24 hours after an earthquake are critical. This period should be kept in mind while organizing and taking necessary precautions, and early responses to earthquakes should be meticulously planned.

Angiotensin II and angiotensin II receptor 2 levels can predict shock and mortality in septic patients.

BACKGROUND: The aim of this study was to evaluate the place of angiotensin II and its receptors in the prognosis of septic patients. METHODS: Patients with sepsis and septic shock were included in the study group. The control group consisted of patients who were followed up in the ICU and had no sepsis/septic shock. Plasma angiotensin II, angiotensin receptor-1 and 2 (AT-1, AT-2) levels were evaluated first and third days. RESULTS: Angiotensin II levels were significantly lower in the septic shock and non-survivor. AT-1 levels were lower in all septic patients on the first day compared to the control. While AT-1 levels on the third day decreased in the septic shock group, it increased in the sepsis group. AT-2 levels were significantly higher in sepsis, and lower in septic shock compared to controls on the first day. Angiotensin II (95%, 82%) and AT-2 levels (100%, 87%) were observed to have high sensitivity and specificity in demonstrating the presence of shock in septic patients. Angiotensin II and AT-1/AT-2 ratios were observed to have high sensitivity and low specificity in the development of mortality. CONCLUSIONS: In septic patients, angiotensin II, AT-2 and AT-1/AT-2 levels can predict the probability of shock development and mortality.

Potential Risk Factors for In-Hospital Mortality in Patients with Moderate-to-Severe Blunt Multiple Trauma Who Survive Initial Resuscitation.

INTRODUCTION: The aim was to identify risk factors that influence in-hospital mortality for patients with moderate-to-severe blunt multiple trauma (BMT) who survive initial resuscitation. METHODS: The prospective study involved 195 adult patients with BMT who were admitted to a referral hospital's emergency department (ED) between May 1, 2015, and May 31, 2016. RESULTS: Forty-three (22%) of the 195 patients died in hospital. Multivariate analysis identified low blood pH (odds ratio [OR] 6.580, 95% confidence interval [CI] 1.12-38.51), high serum lactate level (OR 1.041, 95% CI 1.01-1.07), high ISS (OR 1.109, 95% CI 1.06-1.16), high APACHE II score (OR 1.189, 95% CI 1.07-1.33), traumatic brain injury (TBI) (OR 4.358, 95% CI 0.76-24.86), severe hemorrhage (OR 5.314, 95% CI 1.07-26.49), and coagulopathy (OR 5.916, 95% CI 1.17-29.90) as useful predictors of acute in-hospital mortality. High ISS (OR 1.047, 95% CI 1.02-1.08), TBI (OR 8.922, 95% CI 2.57-31.00), sepsis (OR 4.956, 95% CI 1.99-12.36), acute respiratory distress syndrome (ARDS) (OR 8.036, 95% CI 1.85-34.84), respiratory failure (OR 9.630, 95% CI 2.64-35.14), renal failure (OR 74.803, 95% CI 11.34-493.43), and multiple organ failure [MOF] (OR 10.415, 95% CI 4.48-24.24) were risk factors for late in-hospital mortality. High Glasgow Coma Scale (GCS) was a good predictor for survival at 2, 7, and 28 or more days of hospitalization (OR 0.708 and 95% CI 0.56-0.09; OR 0.835 and 95% CI 0.73-0.95; OR 0.798 and 95% CI 0.71-0.90, resp.). CONCLUSION: Several factors signal poor short-term outcome for patients who present to the ED with moderate-to-severe BMT: low blood pH, high serum lactate level, presence of TBI, severe hemorrhage, coagulopathy, organ failure (respiratory, renal, and MOF), and ARDS. For this patient group, ISS and APACHE II scores might be helpful for stratifying by mortality risk, and GCS might be a good predictor for survival.

Prognostic Value of Procalcitonin, CRP, Serum Amyloid A, Lactate and IL-6 Markers in Liver Transplant Patients Admitted to ED with Suspected Infection.

BACKGROUND/AIM: Infections are one of the most important causes of mortality and morbidity after liver transplantation as in all transplantations. Infectious complications are known to be among the preventable causes with appropriate diagnosis and treatment. So early prediction of the risk of infections will provide an effective approach to determine the local antimicrobial resistance and prevention of specific risk factors. The aim of this study was to deterimne whether specific markers are useful or not to deterimne a suspected infection in patients that have undergone liver transplantation. PATIENTS AND METHODS: The study included 65 patients with liver transplantation admitted to emergency room with suspicion of infection. These patient's CRP, procalsitonin (PCT), lactate, SAA and IL-6 levels were initially measured in the emergency department. The patients were classified to three categories according to culture results; culture-negative, culture-positive and control group. Studying parameters were investigated according to whether the culture was positive or negative in these patients. RESULTS: CRP, PCT, lactate, SAA and IL-6 levels were significanlty high in patients with suspected infeciton when compared to the control group (p<0.05). CRP, PCT and IL-6 levels were higher in the culture-positive group than in the culture-negative group and there was a significant variation (p<0.05). When suspecting an infection evaluating the parameters CRP, PCT and IL-6 was very meaningfull (p<0.05). CONCLUSION: We can use CRP, PCT, lactate, SAA and IL-6 parameters to identify presence of infection at the liver transplantation patients admitted to the emergency department with suspected infection. If CRP, PCT and IL-6 levels are significantly high we can guess the patient's positive culture.

Hemolysis, elevated liver enzymes, and low platelet syndrome: Outcomes for patients admitted to intensive care at a tertiary referral hospital.

PURPOSE: The aim was to assess outcomes for pregnancies in which hemolysis, elevated liver enzymes, and low platelet (HELLP) syndrome develops and the patient requires transfer for critical care. MATERIALS AND METHODS: The cases of women with HELLP syndrome who delivered at our tertiary center or surrounding hospitals and were admitted to the intensive care between January 2007 and July 2012 were retrospectively analyzed. Results were compared for the surviving and non-surviving patients. RESULTS: Among the 77 women with HELLP syndrome, maternal mortality rate was 14% and 24 (30%) of 81 fetuses and newborns died in the perinatal period. The most common maternal complications were disseminated intravascular coagulation (DIC) (n = 22; 29%), acute renal failure (n = 19; 25%), and postpartum hemorrhage (n = 16; 21%). Compared with surviving women, the non-surviving women had higher mean international normalized ratio (INR) (p < 0.0001); higher mean serum levels of aspartate aminotransferase (AST) (p < 0.0001); higher alanine aminotransferase (ALT) (p < 0.0001); higher lactate dehydrogenase (LDH) (p < 0.0001), and higher bilirubin (p = 0.040) levels; and lower platelet count (p = 0.005). CONCLUSION: DIC is a major risk factor for maternal outcome among patients with HELLP syndrome who require intensive care. Low platelet count; high AST, ALT, LDH, INR; and total bilirubin are associated with high mortality risk in this patient group. In addition, low platelet count; low fibrinogen level; prolonged activated thromboplastin time; high INR; and high total bilirubin, LDH, blood urea nitrogen, and creatinine are associated with high risk for complications in this patient group.

N-terminal pro-B-type natriuretic peptide as a marker of blunt cardiac contusion in trauma.

Cardiac contusion is usually caused by blunt chest trauma and, although it is potentially a life-threatening condition, the diagnosis of a myocardial contusion is difficult because of non-specific symptoms and the lack of an ideal test to detect myocardial damage. Cardiac enzymes, such as creatine kinase (CK), creatine kinase MB fraction (CK-MB), cardiac troponin I (cTn-I), and cardiac troponin T (cTn-T) were used in previous studies to demonstrate the blunt cardiac contusion (BCC). Each of these diagnostic tests alone is not effective for diagnosis of BCC. The aim of this study was to investigate the serum heart-type fatty acid binding protein (h-FABP), N-terminal pro-B-type natriuretic peptide (NT-proBNP), CK, CK-MB, and cTn-I levels as a marker of BCC in blunt chest trauma in rats. The eighteen Wistar albino rats were randomly allocated to two groups; group I (control) (n=8) and group II (blunt chest trauma) (n=10). Isolated BCC was induced by the method described by Raghavendran et al. (2005). All rats were observed in their cages and blood samples were collected after five hours of trauma for the analysis of serum h-FABP, NT-pro BNP, CK, CK-MB, and cTn-I levels. The mean serum NT-pro BNP was significantly different between group I and II (10.3 ± 2.10 ng/L versus 15.4 ± 3.68 ng/L, respectively; P=0.0001). NT-pro BNP level >13 ng/ml had a sensitivity of 87.5%, a specificity of 70%, a positive predictive value of 70%, and a negative predictive value of 87.5% for predicting blunt chest trauma (area under curve was 0.794 and P=0.037). There was no significant difference between two groups in serum h-FABP, CK, CK-MB and c Tn-I levels. A relation between NT-Pro BNP and BCC was shown in this study. Serum NT-proBNP levels significantly increased with BCC after 5 hours of the blunt chest trauma. The use of NT-proBNP as an adjunct to other diagnostic tests, such as troponins, electrocardiography (ECG), chest x-ray and echocardiogram may be beneficial for diagnosis of BCC.

Histopathological evaluation of melatonin as a protective agent in heart injury induced by radiation in a rat model.

INTRODUCTION: Melatonin is a hormone which is known to be a powerful cardioprotective agent due to its free radical-scavenging properties. This study was carried out to evaluate whether melatonin administration prior to irradiation would have a protective effect on cardiac histopathological changes in an experimental rat model. METHODS: Rats were divided into four groups. Single dose of 18 Gy radiation and sham radiation exposure were used in related groups. 50mg/kg dose of melatonin were injected intraperitonally 15 min prior to radiation exposure. Analyses and assessments were performed 6 months after radiation exposure. RESULTS: Severe myocardial fibrosis was observed prominently in three regions: the apex, tips of papillary muscles and adjacent to the atrioventricular valves. Inflammation was found to be more in irradiated groups. Increased inflammation and fibrosis were in concordance. The number of mast cells was found to be decreased in irradiated groups. Myocyte necrosis and fibrosis were diminished with melatonin while vasculitis was prevented. CONCLUSIONS: Elementary pathological lesions of radiation-induced heart disease (RIHD) are fibrosis, vascular damage, vasculitis and myocyte necrosis. Development of vasculitis was prevented by the use of melatonin. Fibrosis and necrosis were prominently decreased. Prevention of RIHD with the use of melatonin at the long term is encouraging according to the histopathological results.

Traumatic central cord syndrome in a 2-year-old child: minor trauma but major complication.

BACKGROUND: Traumatic central cord syndrome (TCCS) is the most frequently encountered incomplete spinal cord injury, and it is a relatively rare situation in children younger than 15 years, but may have serious consequences. METHODS: We report the case of a 2-year-old female child with upper extremity weakness following a simple fall. All vitals and systemic examination findings were normal, except for 2/5 muscular strength in the upper extremities. While radiographic imaging showed no pathologic findings, MRI exposed spinal injury. The patient was treated conservatively with medication only. The medical treatment of the patient consisted of anti-edema treatment with methylprednisolone in the first 24 hours; 330 mg of methylprednisolone infused in the first hour, followed by 59 mg per hour during the next 23 hours. Along with pharmacological treatment, she received physiotherapy sessions during her 11-day hospitalization period. RESULTS: The child had full recovery within 6 months after conservative treatment. CONCLUSION: Neurological deficit without plain radiographic evidence in pediatric spinal trauma patients is a rare but significant incident.

Oxidative stress in the in vivo DMBA rat model of breast cancer: suppression by a voltage-gated sodium channel inhibitor (RS100642).

Breast cancer (BCa) was induced in vivo in female rats with 7,12-dimethylbenz(a)anthracene (DMBA). Two main questions were addressed. Firstly, would the carcinogenesis be accompanied by oxidative stress as signalled by superoxide dismutase, glutathione peroxidase, malondialdehyde and total nitrate? Secondly, would treating the rats additionally with a blocker of voltage-gated sodium channel (VGSC) activity, shown previously to promote BCa progression, affect the oxidative responses? The DMBA-induced increases in the antioxidant systems were completely blocked by the VGSC inhibitor RS100642, which also significantly prolonged the lifespan. We conclude that VGSC inhibition in vivo can significantly protect against oxidative stress and improve survival from tumour burden.

Case report of a traumatic abdominal wall hernia resulting from falling onto a flat surface.

This article reports a case of high-energy type traumatic abdominal wall hernia (TAWH) associated with multiple organ injuries including pelvic fractures, liver laceration and ascending colon perforation. The cause of the trauma was falling to the ground from a height of approximately 8 meters. Since the forces affecting the abdomen are unique when falling on a flat surface, the mechanism of defect may be different between a low-energy type handlebar hernia and high-energy type TAWH. Only a few cases of high-energy type TAWH exist in the literature, all reporting falling on or hitting an angled or curved material. To our knowledge, this is the only report of TAWH resulting from falling onto a flat surface. The diagnosis and management are summarized, the literature data are reviewed, and the mechanism of action is discussed.

Obstetric admissions to the intensive care unit in a tertiary referral hospital.

PURPOSE: The present study was conducted to evaluate the obstetric admissions to the intensive care unit (ICU) in the setting of a tertiary referral hospital in an attempt to identify the risk factors influencing maternal outcome. MATERIALS AND METHODS: All of the obstetric patients who seeked care for delivery at the emergency department and who were admitted to the ICU between January 2006 to July 2009 were retrospectively identified. The Simplified Acute Physiology Score (SAPS II) was calculated and the maternal mortality rate was estimated for each patient. The mean SAPS II scores and the mean estimated maternal mortality rates for the surviving patients and the nonsurviving patients were compared. RESULTS: Seventy-three obstetric patients were admitted to the ICU. There were 9 maternal deaths and 24 fetal deaths. For the surviving group of patients, the mean SAPS II score was 34 and estimated maternal mortality rate was 20%, whereas for the nonsurviving group of patients, the SAPS II score was 64 and estimated maternal mortality rate was 73%. The difference between the surviving group of patients and the nonsurviving group of patients was statistically significant regarding both the mean SAPS II scores and the mean estimated maternal mortality rates. CONCLUSIONS: Pregnancy-induced hypertensive disorders and hemorrhage appear as the major risk factors influencing maternal outcome in obstetric patients. Considering that the use of the SAPS II scores have enabled the reliable estimation of the mortality rates in the present study, the attempts at defining the focus of care for the obstetric patients who bear the major risk factors and who are admitted to the ICU should be carried out under the guidance of the ICU scoring systems such as the SAPS II.

Intensive care of a weils disease with multiorgan failure.

UNLABELLED: Leptospirosis is a commonly encountered type of zoonosis, especially in tropical regions. There is insufficient data regarding its frequency in non-tropical regions such as Turkey. Although leptospirosis presents with a mild icteric form in nearly 90% of cases, it can lead to Weils disease characterized by fever as well as fulminant hepatorenal and respiratory failure, in approximately 5 - 10% of cases. In this case report, we present a patient with Weil's disease, complicated with multiorgan failure. KEYWORDS: Weils disease; Leptospirosis; Multiorgan failure.

Do sodium channel blockers have neuroprotective effect after onset of ischemic insult?

OBJECTIVE: Cerebral ischemia causes a series of pathophysiologic events that may result in cerebral infarct. Some neurons are more vulnerable to ischemia, particularly pyramidal neurons in the hippocampal CA1 region. Pharmacologic intervention for treatment of cerebral ischemia aims to counteract secondary neurotoxic events or to interrupt the progression of this process. In the present study, we compare the neuroprotective effects of sodium channel blockers (mexiletine, riluzole and phenytoin) and investigate whether they have neuroprotective effect when given after ischemic insult. METHODS: A transient global cerebral ischemia model was performed in this study by clipping bilateral common carotid arteries during 45 minutes. Riluzole (8 mg/kg), mexiletine (80 mg/kg) and phenytoin (200 mg/kg) were injected into the rats intraperitoneally 30 minutes before or after reperfusion. Lipid peroxidation levels and cerebral water contents were evaluated 24 hours after ischemia. Histopathologic assessment of hippocampal region was determined 7 days after ischemia. RESULTS: Riluzole, mexiletine and phenytoin treatment after global ischemia significantly decreased water content of the ischemic brain (p<0.05 for each). No significant difference was observed in cerebral edema among the drug treatment groups (p>0.05). When pre-treatment and post-treatment groups were compared with each other, only riluzole pre-treatment group revealed better result for cerebral edema (p<0.05). Pre-treatment with these drugs revealed significantly better results for the malonyldialdehyde (MDA) level and the number of survival neuron on the hippocampal region than the post-treatment groups. CONCLUSION: It is demonstrated that riluzole, mexiletine and phenytoin are potent neuroprotective agents in the rat model of transient global cerebral ischemia, but they are more effective when given before onset of the ischemia.

Does pinealectomy affect the recovery rate after spinal cord injury?

Previous reports documented demonstrated that melatonin, a free radical scavenger, is important in protecting against oxidative stress-induced tissue damage after spinal cord injury (SCI). This study was undertaken to investigate the effects of pinealectomy (PX) and administration of exogenous melatonin after SCI in rats. These animals were randomized into six groups, each having 12 rats. Group 1 underwent laminectomy alone. Group 2 underwent laminectomy followed by SCI and received no medication. Group 3 underwent laminectomy followed by SCI and received melatonin. Group 4 underwent PX and laminectomy alone. Group 5 underwent PX and laminectomy followed by SCI and received no medication. Group 6 underwent PX and laminectomy followed by SCI and received melatonin. Melatonin (100 mg/kg) was given intraperitoneally immediately after trauma to the rats in the groups 3 and 6. PX caused a significant increase in the malondialdehyde (MDA), nitrite oxide (NO), glutathione (GSH), xanthine oxidase (XO) levels and decrease in GSH levels as compared with the control group. Trauma to the spinal cord results in significantly higher oxidative stress. Melatonin administration significantly reduced MDA, XO and NO levels, and increased GSH levels in the spinal cord after trauma. Exogenous melatonin treatment after trauma attenuated tissue lesion area and accelerated motor recovery rate. These findings suggest that reduction in endogenous melatonin after PX makes the rats more vulnerable to trauma and exogenous melatonin administration has an important neuroprotective effect on the level of the spinal cord.

The histopathological evaluation of the effectiveness of melatonin as a protectant against acute lung injury induced by radiation therapy in a rat model.

PURPOSE: This study presents the histopathological evaluation of the effectiveness of melatonin as a protectant against acute lung injury induced by radiation therapy. MATERIALS AND METHODS: Thirty-two Wistar rats were divided into four groups. The rats in Group 1 received melatonin and underwent radiation therapy. The rats in Group 2 received no melatonin and underwent radiation therapy. The rats in Group 3 received melatonin and underwent sham radiation therapy. The rats in Group 4 received no melatonin and underwent sham radiation therapy. Melatonin was administered at a dose of 100 mg/kg using an intraperitoneal injection. Radiation therapy was delivered on a Cobalt-60 unit using a single fraction of 18 Gy through an anterior portal covering the right lung in entirety. The rats underwent euthanasia at 6 weeks following radiation therapy. The lungs were dissected and blinded histopathological evaluation was performed. RESULTS: Concerning the right lung, a decrease in intra-alveolar edema and intra-alveolar erythrocytes was observed despite an increase in activated macrophages, intra-alveolar fibrosis, hyaline arteriosclerosis and alveolar wall thickness for the rats in Group 1 as compared to the rats in Group 2. Concerning the left lung, a decrease in alveolar neutrophils and intra-alveolar erythrocytes was evident despite an increase in activated macrophages, hyaline arteriosclerosis and alveolar wall thickness for the rats in Group 1 as compared to the rats in Group 2. CONCLUSIONS: This study puts forward the histopathological evidence regarding the effectiveness of melatonin as a protectant against acute lung injury induced by radiation therapy through restrained inflammation, regrettably at the expense of promoted fibrosis. The effectiveness of melatonin as a protectant against acute lung injury induced by radiation therapy needs to be evaluated further for the unresolved concerns regarding the safety.

Central nervous system protection by resveratrol in streptozotocin-induced diabetic rats.

The objective of the present study was to investigate the possible neuroprotective effect of resveratrol against streptozotocin-induced hyperglycaemia in the rat brain and medulla spinalis. Thirty adult male Wistar rats were divided into three groups as follows: control group, streptozotocin-induced diabetic-untreated group, and streptozotocin-induced diabetic resveratrol-treated group. Diabetes was induced by a single injection of streptozotocin (STZ) (60 mg/kg body weight). Three days after streptozotocin injection, resveratrol (10 mg/kg) was injected intraperiteonally daily over 6 weeks to the rats in the treatment group. Six weeks later, seven rats from each group were killed and the brain stem and cervical spinal cord were removed. The hippocampus, cortex, cerebellum, brain stem and spinal cord were dissected for biochemical studies (lipid peroxidation measuring malondialdehyde [MDA], xanthine oxidase [XO], nitric oxide [NO] and glutathione). MDA, XO and NO levels in hippocampus, cortex, cerebellum, brain stem and spinal cord in the streptozotocin-induced diabetic-untreated group increased significantly. Treatment with resveratrol significantly reduced MDA, XO and NO production and increased glutathione levels when compared to the streptozotocin-induced diabetic-untreated group. This study demonstrates that resveratrol is a potent neuroprotective agent against diabetic oxidative damage.

Neuroprotection by resveratrol against traumatic brain injury in rats.

Oxidative stress after traumatic brain injury may contribute to many of the pathophysiologic changes. Resveratrol, naturally present at high concentration in grape skin, seeds, and red wine, has significant antioxidant properties in a variety of in vitro and in vivo models. In this study, we investigate the effect of resveratrol on oxidative stress after traumatic brain injury in rat model.A total of 54 adult Wistar albino male rats weighing 250-300 g were used. The rats were allocated into three groups. The first group was control (sham-operated) group in which only a craniotomy was performed, the others were trauma and resveratrol groups. A 100 mg/kg single dose of resveratrol, freshly prepared by dissolving in 50% ethanol and diluted in physiological saline (2%), for resveratrol group, and 1 ml ethanol (2%) for trauma group, was administered intraperitoneally immediately after trauma. Weight-drop method was used for achieving head trauma. Then, all groups were separated into three subgroups for biochemical analysis, brain water content and histopathological assessment following trauma. Twenty-four hours after trauma brain water content and malondialdehyde (MDA), glutathione (GSH), nitric oxide (NO), xanthine oxidase (XO) levels of traumatic hemisphere were evaluated. Quantitative histopathological analysis was performed on 14th day postinjury. Trauma caused a significant increase in MDA, XO, NO levels and decrease in GSH level as compared to control group. Resveratrol administration significantly reduced MDA, XO and NO levels, increased GSH level, and also attenuated tissue lesion area. Our results indicate that treatment with resveratrol immediately after traumatic brain injury reduce oxidative stress and lesion volume. Future studies involving different doses and the dose-response relationship could promise better results.

The evaluation of the oxidant injury as a function of time following brain irradiation in a rat model.

This study presents the evaluation of the oxidant injury as a function of time following brain irradiation in a rat model. Thirty-five Wistar rats were divided into seven groups. The rats in Group 1 through Group 6 underwent irradiation, whereas the rats in Group 7 underwent sham irradiation. The rats in Group 1 through Group 6 underwent euthanasia at 1 through 48 h following irradiation, whereas the rats in Group 7 underwent euthanasia immediately following sham irradiation. At the time of euthanasia, the brain tissue was dissected for evaluation of the malondialdehyde (MDA) level and the superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSHPX) activities. The mean MDA levels were increased and the mean SOD, CAT and GSHPX activities were decreased at all of the time points for evaluation for the rats that underwent irradiation as compared to the rats that underwent sham irradiation, substantial for Group 1 and gradually leveling out through Group 6. This study confirms that the oxidant injury is evaluated at its best through the first several hours following brain irradiation.

The effects of granulocyte colony-stimulating factor on the healing of tracheal anastomosis following radiation therapy in rats.

OBJECTIVE: This study evaluates the effects of granulocyte colony-stimulating factor on the healing of tracheal anastomosis following radiation therapy in rats. METHODS: Fifty-six male Wistar rats were divided into four groups. Group 1 underwent tracheal anastomosis. Group 2 underwent radiation therapy followed by tracheal anastomosis. Group 3 underwent radiation therapy followed by tracheal anastomosis and received granulocyte colony-stimulating factor. Group 4 underwent sham radiation therapy followed by sham tracheal anastomosis. At 10 days following radiation therapy, the trachea was dissected for histopathological, mechanical and biochemical evaluation. RESULTS: Median scores for inflammation were three points for Group 1, two points for Group 2, two points for Group 3 and one point for Group 4. Median scores for angiogenesis were four points for Group 1, two points for Group 2, three points for Group 3 and one point for Group 4. Median scores for connective tissue regeneration were four points for Group 1, two points for Group 2, three points for Group 3 and one point for Group 4. Median scores for epithelial regeneration were two points for Group 1, one point for Group 2, one point for Group 3 and one point for Group 4. Mean anastomotic bursting pressures were 853 mmHg for Group 1, 293 mmHg for Group 2, 417 mmHg for Group 3 and 966 mmHg for Group 4. Mean hydroxyproline concentrations were 159 microg/mg for Group 1, 177 microg/mg for Group 2, 120 microg/mg for Group 3 and 117 microg/mg for Group 4. CONCLUSIONS: This study suggests that granulocyte colony-stimulating factor contributes to the healing of tracheal anastomosis following radiation therapy through improved connective tissue regeneration.