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Biomedical subjects

R Ben Abraham

Publications and source records attributed to R Ben Abraham.

At least 19 recordsLinked to original sources
PubMed2002

Gray-white matter discrimination--a possible marker for brain damage in heat stroke?

INTRODUCTION/OBJECTIVE: Heat stroke (HS) is a common medical emergency which carries high morbidity and morality. This study was designed to describe the pattern of central nervous system (CNS) changes as detected by brain CT scan in a case series of six patients suffering from classical and exertional HS. METHODS AND PATIENTS: All the patients were admitted in critical condition during the heat wave in the summer of 1999 in Israel. Each was in deep coma with a measured core temperature of over 40 degrees C upon admission to the emergency department. RESULTS: Aggressive cooling measures decreased the core temperature to <38 degrees C within 30 min following admission. Two patients (33.3%) died. One of the survivors remained in a vegetative state. Brain CT studies carried out within 4 days of admission in all the patients revealed severe loss of gray-white matter discrimination (GWMD) without signs of acute bleed or significant focal lesion, findings that persisted in repeated brain CTs in one patient who remained in a vegetative state. DISCUSSION AND CONCLUSIONS: Loss of GWMD may represent an early and sensitive indication of severe brain damage in patients with severe HS. Further studies in larger groups of patients are warranted in order to determine whether the appearance of GWMD in brain CTs of patients with HS has prognostic value.

Brain↗
PubMed2002

Religious sensitivity pitted against the need to know: autopsy of Jewish children in Israel.

BACKGROUND: The aim of the study was to compare autopsy findings with antemortem findings in children who died in a pediatric intensive care unit. MATERIAL/METHODS: Consecutive series of patients who died in the pediatric intensive care unit during 2-year period were used. The study was conducted as a retrospective chart review at community, regional-referral, university-affiliated tertiary medical center of 1200 bed in Israel. RESULTS: Permission was given to perform autopsies on only 10 children (23.8%, mean age 85.7 months) out of the 42 who died during the study period. The mean length of stay in the pediatric intensive care unit prior to death was 13.3 days. Cardiac or hemato-oncologic diseases comprised the major pre-admission diagnoses. The autopsy revealed a major finding that, if known before death, would have altered clinical management in 50% of the patients: pneumonia, pneumonitis as well as intestinal perforation or necrosis. No correlation was found between patient length of stay in the intensive care unit and the autopsy disclosed information. CONCLUSIONS: Our findings support the importance of autopsy assessment in the pediatric intensive care setup. We believe that postmortem examination is also essential for improving the quality of pediatric patient care.

Adolescent↗
PubMed2001

Lung preconditioning with N-acetyl-L-cysteine prevents reperfusion injury after liver no flow-reflow: a dose-response study.

BACKGROUND: Circulating xanthine oxidase activity and the generated oxidants have been linked to lung reperfusion injury from no flow-reflow conditions in other organs after organ transplantation or surgery. N-acetyl-1-cysteine (NAC), an oxidant scavenger, promotes glutathione in its reduced form (GSH) that is depleted during ischemia. We have recently demonstrated its efficacy in protecting lungs from reperfusion injury if administered during reperfusion of postischemic liver. We now investigated whether preconditioning of lungs with NAC could attenuate lung respiratory or vascular derangement after no flow-reflow (ischemia-reperfusion, IR) and if this depends on lung GSH levels. METHODS: Rat isolated livers were stabilized and perfused with modified Krebs-Henseleit solution (KH) (control, n=12) or made ischemic (no flow, IR-0, n=12) for 2 hr. Meanwhile, lungs were isolated, ventilated, and stabilized (KH+bovine albumin 5%). Serial perfusion (15 min) of liver+lung pairs took place followed by lung only recirculation (45 min) with the accumulated solution. Another three controls and three ischemic groups included lungs treated during stabilization with NAC at 100 mg x kg(-1), 150 or 225 mg x kg(-1) (in 2.5, 3.7 or 5.5 mmol solutions, respectively). Results. Ischemic liver damage, expressed by circulating hepatocellular constituents, was associated with pulmonary artery and ventilatory pressure increases by 70-100% of baseline, abnormal wet-to-dry weight ratio, and abnormal bronchoalveolar lavage volume and content in the IR-0 (nontreated) and the IR-100 and IR-225 pretreated lungs. NAC-150 pretreatment afforded preservation for most parameters. GSH content in the IR-150 lung tissue was only 11% higher than that of IR-225, but 2-fold that in IR-0 and IR-100 GSH lungs. CONCLUSION: Lung preconditioning with NAC prevents reperfusion injury but not in a dose-related manner. Although enhanced GSH tissue content explains lung protection, GSH-independent NAC activity is another possibility.

Acetylcysteine↗
PubMed2001

Wrist actigraphy in anesthesia.

STUDY OBJECTIVES: To examine the use of wrist actigraphy during and following anesthesia or monitored sedation and its ability to objectively assess sleep-related events. DESIGN: Uncontrolled study. SETTING: 1100-bed tertiary care municipal, university-affiliated medical center. PATIENTS AND INTERVENTIONS: 18 patients who underwent minor to medium lower-body surgical procedures with spinal or epidural anesthesia with sedation by propofol, midazolam, or isoflurane-based general anesthesia. MEASUREMENTS AND MAIN RESULTS: Wrist actigraphy was measured and evaluated. The actigraphic recordings accurately indicated the presence and time of occurrence of all relevant perioperative events including those related to anesthesia. Actigraphic data were more precise than equivalent attending anesthesiologist's subjective observations. The anesthesiologist detected changes in the patient's activity with a delay of minutes after they had been picked up by the actigraph. The integrated areas of recorded phases of midazolam-induced sedation and the occurrence and reversal of paradoxical reactions were distinctly discernible as such, unlike the less specifically defined description of the anesthesiologist. CONCLUSIONS: Real time actigraphic monitoring can provide clear-cut and objective indications of changes in the depth of anesthesia or sedation and its associated events during surgery and recovery.

Adult↗
PubMed2001

Perioperative care of children with nerve agent intoxication.

Nerve agents (NA) present a major threat to civilian populations. When a ballistic system is used for spreading poison, multiple trauma, as well as toxic trauma could be caused. Children are more susceptible, due to their smaller physiological reserve. Urgent surgical intervention for combined intoxication in the multiple-traumatized child could be a tremendous task in view of the background of physiological instability. Nerve agents affect the autonomic, as well as the central nervous system, leading occasionally to unexpected interactions with agents normally used for resuscitation. This can cause additional instability, and possibly systemic collapse. This review presents and emphasizes points concerning treatment of a child who suffers from combined multiple and toxic traumas. The review is based on scant knowledge of a database of similar cases of pesticide organophosphate poisoning in children since these compounds are alike. We also extrapolated data from reports concerning episodic civilian exposure to NA.

Antidotes↗
PubMed2001

Role of the molecular adsorbent recycling system (MARS) in the treatment of patients with acute exacerbation of chronic liver failure.

OBJECTIVE: To test the efficacy of the molecular adsorbent recycling system (MARS) in patients with acute exacerbation of chronic liver disease. DESIGN: A prospective case analysis. SETTING: A university-affiliated tertiary medical center. PATIENTS AND METHODS: We applied MARS to treat a consecutive series of eight patients with acute exacerbation of chronic liver disease. RESULTS: The overall survival rate was 62.5%. All patients demonstrated improvement with regard to their degree of encephalopathy. In three patients, intracranial pressure and jugular bulb oxygen saturation decreased and cerebral perfusion pressure increased after treatment institution. Patients' hyperdynamic state was attenuated, as demonstrated by elevation of systemic vascular resistance, mean arterial pressure, and parallel reduction in cardiac index. A prompt reduction in serum ammonia, bilirubin, and lactate levels was observed. There were no complications during the treatment period. CONCLUSIONS: Applying MARS treatments to patients with acute exacerbation of chronic liver disease can detoxify blood, improve cerebral circulation, and reduce brain edema, as reflected by the reduction in intracranial pressure and jugular bulb oxygen saturation values in our patients. A partial reversal of the characteristic hyperdynamic circulation was also achieved. Despite our encouraging results, further testing is needed to determine the reliability of the system.

Adsorption↗
PubMed2001

Snakebite poisoning in children--a call for unified clinical guidelines.

In Israel, there are no uniform guidelines for the treatment policy of children snake-bitten by the Vipera palaestinae, the most abundant venomous snake in the country. We conducted a retrospective study aiming to compare treatment policies in two different medical centers. We found significant differences regarding admission and steroid administration criteria. Although the differences between the centers regarding anti-venom administration did not reach statistical significance, there were substantial differences. Neither of the centers had a well-established policy for the treatment of snake envenomation in children. In the era of cost containment, a policy of routine admission of children to the PICU service following V. palaestinae envenomation is unjustified, especially since the introduction of a specific monovalent anti-venom into the therapeutic armamentarium.

Adolescent↗
PubMed2001

Liver support systems.

In recent years liver transplantation was shown to be the only clinically effective method of treating acute or chronic hepatic failure due to various causes. However, this ultimate therapeutic approach is limited by the growing disparity between organ donation and the number of patients on the waiting list. Factors such as high cost, morbidity, and the need for lifelong immunosuppression accelerated the research on alternative methods to support the failing liver. Recently, new technologies incorporating hepatocytes and extracorporeal circulation devices were introduced for liver support. This review presents current knowledge on liver support systems and their role in the treatment of acute liver failure.

Adult↗
PubMed2000

[FK506 (tacrolimus) does not increase hepatic damage due to hypoperfusion].

Deterioration of hepatic function following liver transplantation is a known complication, sometimes attributed to the use of cyclosporin A. Reaction to tacrolimus (Prograf), a relatively new and effective immunosuppressant drug, is thought to result in a much lower grade of organ dysfunction, especially in the transplanted liver. Using the ex-vivo rat model of isolated perfused liver, we evaluated hepatocellular damage and oxygen extraction when tacrolimus was administered following liver hypoperfusion. Tacrolimus did not worsen hepatic dysfunction caused by the hypoperfusion. Therefore using tacrolimus in the perioperative period might be safer than cyclosporin A, which tends to worsen hepatic damage in the presence of hypoperfusion.

Animals↗
PubMed2000

Anaesthesia and critical care considerations in nerve agent warfare trauma casualties.

Nerve agents (NA) (tabun, sarin, suman, VX) have been stocked around the world for some time and still present a major threat to civilian as well as to military populations. Since NA can be delivered through both an aerial spray system and a ballistic system, victims could suffer both NA intoxication and multiple trauma necessitating urgent surgical intervention followed by intensive care. These patients can be expected to be extremely precarious neurologically, respiratorily and haemodynamically. Moreover, their clinical signs can be misleading. Further exacerbating the problem is the fact that interactions of NA with the pharmacological agents used for resuscitation and/or during anaesthesia can aggravate organ instability even more and possibly cause systemic collapse. There are no protocols for perioperative critical care and early assessment or for the administration of anaesthesia for surgical interventions in such combined multiple trauma and intoxicated casualties. We propose a scheme for the administration of critical care and anaesthesia based on the scant anecdotal reports that have emerged after the occurrence of local accidents involving NA intoxication and on the neuropharmacological knowledge of the pesticide organophosphate poisoning database, these compounds being related chemical substances.

Anesthetics↗
PubMed2000

Metabolic and clinical markers of prognosis in the era of CT imaging in children with acute epidural hematomas.

Acute epidural hematoma (AEH), a relatively common complication of head injury in children, persists in bearing high morbidity and mortality. Early establishment of prognosis could guide optimal patient allocation, and early identification of predictive signs could assist in choosing appropriate therapeutic interventions. This study aimed to delineate expeditiously obtainable prognostic markers for determining outcome in a subset of children with AEH. We reviewed our 11-year experience with 61 consecutive children <16 years old with head trauma and isolated AEH. Treatment followed a standard advanced trauma life support protocol. A medical history was obtained, and all patients underwent neurosurgical and physical evaluations. CT scans were performed, as were laboratory tests which included arterial blood gases, glucose, electrolytes (K(+), Na(+)), hemoglobin and coagulation studies. Evaluation of the data collected on cause of injury, interval between trauma occurrence and presentation, clinical symptoms, Glasgow Coma Scale (GCS) scores, vital signs, laboratory test results, physical findings and surgical versus conservative management revealed that the best single predictors of outcome following AEH were the GCS and focal neurological deficits. Of all laboratory data obtained on admission, the blood potassium, pH and glucose test results correlated significantly with prognosis. Prognosis can be adequately and expeditiously estimated by selected markers within a comprehensive evaluation of children with AEH.

Acute Disease↗
PubMed2000

Problematic intubation in soldiers: are there predisposing factors?

Attempts by a combat medical officer to secure the airway of a multiple-injury patient in the field may frequently end in failure. The recurrence of such failures, despite Advanced Trauma Life Support training, is perplexing; therefore, we studied the prevalence of clinical criteria that could predispose active soldiers to difficult intubation. Such known anatomical features and the Mallampati classification were assessed by experts in 250 soldiers at a military outpatient clinic of the Israel Defense Forces. It was found that most soldiers had normal airways. Limitations of head and neck movement, or in opening the mouth, were not observed. Other risk factors were noted in only a small percentage of the study population. Mallampati classes I and II were noted in 40% and 31%, respectively. No statistically significant differences between young (18-21 years) and older (40-44 years) soldiers were found. It was concluded that difficult intubations among soldiers are unlikely to be associated with anatomical causes. Complicated scenarios and deficient skills of the physicians are the most important factors that contribute to in-field failures to secure airway control. Several recommendations to remedy this situation are offered.

Adolescent↗
PubMed1999

[Head injuries in children--clinical characteristics as prognostic factors].

An unselected series of 200 consecutive cases of major head trauma in children aged 6 months to 16 years, seen during 4 years, was studied. Injuries were due to road accidents (40%), falls (30.5%) and other causes (29.5%), and were assessed clinically and by cranial CT. On admission the Glasgow Coma Score ranged from 4.72-11.65 and in addition to pupillary responses and brain stem reflexes, was a significant predictor of outcome. Brain edema, midline shift, intracranial hemorrhage and also hyperglycemia, hypokalemia and coagulopathy, were associated with poor outcome. While 17% died, 53% were discharged in good functional condition. Early identification of clinical features related to prognosis can help the caring team provide maximal support for patient and family.

Accidental Falls↗
PubMed1999

[Intrahospital transport of critically ill children].

Prospective evaluation of intrahospital transportation of 33 critically ill children to and from the pediatric intensive care unit was conducted over the course of a month. Factors contributing to risk of transport were assessed. There were 33 children (25 boys and 8 girls), 3 days to 15 years of age. Reasons for admission included: disease and trauma in 19, and status post operation in 11. The pretransport PRISM score was 4.84. 22 children (66.6%) were being mechanically ventilated and 10 (30.3%) were being treated with amines. Transport time ranged from 8-150 minutes. 15 of the transports (45.4%) were urgent and a special intensive care team escorted 22 (66.6%). Equipment mishaps and physiological deterioration occurred in 12 (36.3%) and 11 (30.3%) of the cases, respectively. The use of amines, mechanical ventilation, longer transport time and high PRISM score were all associated with physiological deterioration on transport.

Adolescent↗
PubMed1998

[Massive pulmonary embolism--summary of experiences with 13 patients].

Pulmonary embolism is a common event in hospitalized patients. In some cases it presents with hemodynamic collapse, indicating massive obliteration of the pulmonary vasculature and has a very grim prognosis; 2/3 of such patients die within 2 hours of onset of symptoms. We describe our experience in 13 patients with massive pulmonary embolism. An aggressive diagnostic and therapeutic approach, utilizing sophisticated imaging techniques, thrombolytic therapy and surgery, led to the survival of 8 of the patients. Our experience supports an aggressive approach in these seriously ill patients.

Adult↗