Comparison of Human Surrogate Responses in Underbody Blast Loading Conditions.

Impact biomechanics research in occupant safety predominantly focuses on the effects of loads applied to human subjects during automotive collisions. Characterization of the biomechanical response under such loading conditions is an active and important area of investigation. However, critical knowledge gaps remain in our understanding of human biomechanical response and injury tolerance under vertically accelerated loading conditions experienced due to underbody blast (UBB) events. This knowledge gap is reflected in anthropomorphic test devices (ATDs) used to assess occupant safety. Experiments are needed to characterize biomechanical response under UBB relevant loading conditions. Matched pair experiments in which an existing ATD is evaluated in the same conditions as a post mortem human subject (PMHS) may be utilized to evaluate biofidelity and injury prediction capabilities, as well as ATD durability, under vertical loading. To characterize whole body response in the vertical direction, six whole body PMHS tests were completed under two vertical loading conditions. A series of 50th percentile hybrid III ATD tests were completed under the same conditions. Ability of the hybrid III to represent the PMHS response was evaluated using a standard evaluation metric. Tibial accelerations were comparable in both response shape and magnitude, while other sensor locations had large variations in response. Posttest inspection of the hybrid III revealed damage to the pelvis foam and skin, which resulted in large variations in pelvis response. This work provides an initial characterization of the response of the seated hybrid III ATD and PMHS under high rate vertical accelerative loading.

Daily Oxygen/O3 Treatment Reduces Muscular Fatigue and Improves Cardiac Performance in Rats Subjected to Prolonged High Intensity Physical Exercise.

Rats receiving daily intraperitoneal administration of O2 and running on a treadmill covered an average distance of 482.8 ± 21.8 m/week as calculated during 5-week observation. This distance was increased in rats receiving daily intraperitoneal administration of an oxygen/O3 mixture at a dose of 100; 150; and 300 µg/kg with the maximum increase being +34.5% at 300 µg/kg and still present after stopping the administration of oxygen/O3. Oxygen/O3 decreased the mean arterial blood pressure (-13%), the heart rate (-6%), the gastrocnemius and cardiac hypertrophy, and fibrosis and reduced by 49% the left ventricular mass and relative wall thickness measurements. Systolic and diastolic functions were improved in exercised oxygen/O3 rats compared to O2 rats. Oxygen/O3 treatment led to higher MPI index starting from the dose of 150 µg/kg (p < 0.05) and more effective (+14%) at a dose of 300 µg/kg oxygen/O3. Oxygen/O3 dose-dependently increased the expression of the antioxidant enzymes Mn-SOD and GPx1 and of eNOS compared to the exercised O2 rats. The same doses resulted in decrease of LDH levels, CPK, TnI, and nitrotyrosine concentration in the heart and gastrocnemius tissues, arguing a beneficial effect of the ozone molecule against the fatigue induced by a prolonged high intensity exercise.

Bilateral Chronic Subdural Nontraumatic Hematoma in a Woman Affected by AL Amyloidosis.

Chronic subdural hematoma (CSDH) is a condition frequently seen in neurosurgical practice, especially among the elderly. It is often preceded by head injury, even a trivial trauma. Light chain (AL) amyloidosis is a disorder involving extracellular tissue deposition of misfolded native proteins called amyloids. The several types of amyloidosis differ by source of proteins, organ involvement, treatment, and prognosis. We describe the case of a 59-year-old woman affected by AL amyloidosis, harboring surgically treated bilateral chronic nontraumatic subdural hematoma, and we suggest a possible correlation between the clinical entities of CSDH and AL amyloidosis.

Experimental Characterization of the Anatomical Structures of the Lumbar Spine Under Dynamic Sagittal Bending.

Underbody blast (UBB) events transmit high-rate vertical loads through the seated occupant’s lumbar spine and have a high probability of inducing severe injury. While previous studies have characterized the lumbar spine under quasi-static loading, additional work should focus on the complex kinetic and kinematic response under high loading rates. To discern the biomechanical influence of the lumbar spine’s anatomical structures during dynamic loading, the axial force, flexion-extension moments and range of motion for lumbar motion segments (n=18) were measured during different states of progressive dissection. Pre-compression was applied using a static mass while dynamic bending was applied using an offset drop mass. Dynamic loading resulted in peak axial loads of 4,224±133 N, while maximum peak extension and flexion moments were 19.6±12.5 and -44.8±8.6 Nm in the pre-dissected state, respectively. Upon dissection, transection of the interspinous ligament, ligamentum flavum and facet capsules resulted in significantly larger flexion angles, while the removal of the posterior elements increased the total peak angular displacement in extension from 3.3±1.5 to 5.0±1.7 degrees (p=0.002). This study provides insight on the contribution of individual anatomical components on overall lumbar response under high-rate loading, as well as validation data for numerical models.

Anatomical variant of origin of ophthalmic artery: case report.

We report on one case of variant origin of right ophthalmic artery (OA) from C4 choroidal segment of the right supraclinoid internal carotid artery. A 41-year-old woman affected by bitemporal hemianopsia performed Magnetic Resonance Imaging with gadolinium showing tuberculum sellae meningioma. During angiography we observed this variant of origin of OA. At surgical dissection, we observed this variant in carotid cistern.

Circulating free nitrotyrosine and cognitive decline.

OBJECTIVE: To determine if the circulating nitrotyrosine level significantly correlates with parameters measuring cognitive abilities. MATERIALS AND METHODS: One-hundred and twelve community-living subjects (ranging in age from 27 to 98 years) were evaluated for cognitive abilities [Mini Mental State Examination (MMSE) score] and circulating free nitrotyrosine plasma level, as well as for several variables that might influence cognitive abilities (age, education) and nitrotyrosine level (body mass index, haematological parameters, cardiovascular and inflammatory indices). RESULTS: In the sub-group of cognitively impaired subjects (score at MMSE < 23.9), but not in that of cognitively not impaired subjects, a significant inverse correlation exists between nitrotyrosine level and MMSE score (r = -0.378; P < 0.02). CONCLUSIONS: The finding, if confirmed by longitudinal studies, could play a role in the management of the subjects with Mild Cognitive Impairment, the clinical condition considered as a transitional state between the changes of cognitive ability in normal aging and dementia.

Ultrastructural profile of microcystic meningioma.

OBJECTIVE: Microcystic meningioma was originally classified as a subtype of meningioma by the World Health Organization classification of brain tumours in 1993, and accounts for 1.6% of intracranial meningiomas. This subtype is a variety of meningioma in which micro- and macro-cysts are diffuse. The morphologic characteristics are well defined, while the histogenetic mechanism that give rise to these patterns remain unclear. MATERIALS AND METHODS: The authors present an electron microscopic study of an unusual case of fronto-temporal microcystic meningioma, manifesting as history of headache, right paresis and dysphasia in a 73-year-old female. Computer tomography revealed a large hypodense mass in the left fronto-temporal region, with slight contrast enhancement. RESULTS: Ultrastructural observation showed complex alterations among small vessels and intratumoral capillaries in a background of severe modification in vessel permeability. CONCLUSIONS: This electronic microscopy study documented that growth of the cyst was due not only to accumulation of in extracellular fluid, but also to cytolysis consequent to ingravescent hydropic degeneration.

Behavioural, ecological and genetic evidence confirm the occurrence of host-associated differentiation in goldenrod gall-midges.

Host-associated differentiation (HAD) is considered a step towards ecological speciation and an important mechanism promoting diversification in phytophagous insects. Although the number of documented cases of HAD is increasing, these still represent only a small fraction of species and feeding guilds among phytophagous insects, and most reports are based on a single type of evidence. Here we employ a comprehensive approach to present behavioural, morphological, ecological and genetic evidence for the occurrence of HAD in the gall midge Dasineura folliculi (Diptera: Cecidomyiidae) on two sympatric species of goldenrods (Solidago rugosa and S. gigantea). Controlled experiments revealed assortative mating and strong oviposition fidelity for the natal-host species. Analysis of mitochondrial DNA showed an amount of genetic divergence between the two host-associated populations compatible with cryptic species rather than host races. Lower levels of within-host genetic divergence, gall development and natural-enemy attack in the S. gigantea population suggest this is the derived host.

Acute oxygen-ozone administration to rats protects the heart from ischemia reperfusion infarct.

OBJECTIVE AND DESIGN: We tested here the effects of acute administration of an oxygen/ozone (O3) mixture on the myocardial tissue damage following an ischemic event. MATERIAL OR SUBJECTS: The study was done in Sprague-Dawley rats subjected to acute myocardial ischemia/reperfusion (I/R). TREATMENT: 100; 150; and 300 microg/kg oxygen/O3 mixture were insufflated intraperitoneally 1 h prior to I/R. METHODS: Myocardial infarct size measurement and immunhistochemistry or ELISA for nitrotyrosine, CD68, CD8,CD4 and caspase-3 were done. RESULTS: I/R produced a marked damage in the rat left ventricle with an infarct size as percentage of the area at risk (IS/ AR) of approximately 45 +/- 4% . Rats insufflated with a oxygen/O3 mixture showed a significant 2-h cardio-protection (e. g. infarct size over area at risk for the dose of 300 microg/kg was approximately 30 +/- 3%,) as compared with control rats (P <0.01). This effect was paralleled by a decrease in tissue levels of immunostaining for biomarkers of nitrosative stress (nitrotyrosine), inflammation (CD68) and immunity response (CD8 and CD4) between heart tissues from infarcted rats and infarcted O3 treated rats. CONCLUSIONS: These data indicate that the tissue and biochemical damages associated with myocardial ischemia/reperfusion can be counteracted by an acute O3 pretreatment.

HLA allele frequency and clinical outcome in Italian patients with cutaneous melanoma.

The current study focuses the analysis on the possible relationship between HLA allele frequency and clinical outcome of melanoma in a population of 382 Italian patients, as compared with 203 ethnically matched controls. In a 3-year follow-up study, results showed significant differences between groups of patients selected according to clinical stage, histology, and progression of the disease. A*01 seems to be correlated with a less aggressive variant of the disease, whereas DRB1*01-DQB1*0501 seems to be associated with metastatic progression of melanoma. Moreover, a negative association with B*13, B*44, as well as with DRB1*04-DQB1*0302 was found. A multivariate logistic regression model showed HLA-DRB1*04 to behave as an independent favorable prognostic marker of melanoma in our population (OR = 2.34, CI = 1.15-4.74).

Hypermethylation of GpG islands in the promoter region of p15(INK4b) in acute promyelocytic leukemia represses p15(INK4b) expression and correlates with poor prognosis.

We evaluated the methylation status of p15 gene in a series of 65 patients with newly diagnosed acute promyelocytic leukemia (APL) receiving homogeneous treatment. Moreover, in 32 of them, the methylation status of p15 gene was correlated to the p15 m-RNA expression. In total, 31 patients had no p15 methylation (U group). An abnormal methylation pattern was found in 34 patients: in seven of these patients only methylated DNA was detected (M group), while in the remaining 27 patients (M/U group), both methylated and unmethylated DNA were amplified. Patients from M group showed a higher incidence of relapses and a lower disease-free survival (DSF) with respect to patients from U and M/U groups (29, 64 and 79% at 5 years for M, U/M and U patients, respectively, P=0.03), while p15 methylation had no impact on overall survival. The p15 expression was detectable in all patients with unmethylated DNA, in none of patients with fully methylated DNA and in 60% of patients with partially methylated DNA. The DFS estimate at 5 years for p15-negative patients was significantly lower than that of p15-positive patients (P=0.03). These data confirm that the presence of p15 methylation negatively influences the prognosis of APL, mainly when it represses the p15 gene transcription.

Expression of p15(ink4b) gene during megakaryocytic differentiation of normal and myelodysplastic hematopoietic progenitors.

In myelodysplastic syndrome (MDS), the expression of the cyclin-dependent kinase inhibitor p15(ink4B) (p15) is frequently decreased because of the aberrant methylation of the gene promoter; p15 is normally up-regulated during megakaryocytic differentiation. It was hypothesized that p15 methylation and deregulation of gene expression contribute to defective megakaryocytopoiesis in patients with MDS. Here it is shown that the increasing autocrine production of TGF-beta1 stimulates megakaryocytic differentiation in normal CD34(+) cells and that p15 mediates, at least in part, this effect. This TGF-beta1-dependent pathway is altered in MDS CD34(+) progenitors because of p15 methylation. The demethylating agent 2-deoxyAZAcytidin can restore the normal demethylated state of the p15 gene and increase its expression. Nevertheless, MDS CD34(+) cells only poorly differentiate to the megakaryocytic lineage. These findings suggest that p15 methylation occurs in a neoplastic clone with a profound defect of cell proliferation, survival, and differentiation that cannot be overcome by using a demethylating drug.

[Gastric carcinoid. A clinical case and review of the literature]. / Carcinoide gastrico. Caso clinico e revisione della letteratura.

INTRODUCTION: Endoscopic examination of the gastrointestinal tract is very useful, because it allows a rapid diagnosis and, in some cases, a therapeutical effect. CLINICAL CASE: The authors have seen a woman, 72 years old, with epigastric pain, dryness of the mouth, diarrhoea and meteorism. She had an old simple gastritis (of two years standing) and her therapy, since the time of the diagnosis, is omeprazole (20 mg/die). The patient was submitted to gastroscopic examination that revealed two spot lesions and a polypous lesion on which was made a biopsy. The patient was submitted also to the following examination: 1) urinary dosage of 5 HIAA; 2) urinary dosage of 5 OHT; 3) Computed tomography of the abdomen; 4) Heart echography; 5) Endoscopy of the colon; 6) Endoscopy of the bronchus. DISCUSSION: Carcinoid tumors are usually small and rare lesions and they are in the following sites: A) between mouth and the second part of duodenum; B) between the second part of the duodenum and the transverse segment of the colon; C) between the latter and the anus. CLINICAL PICTURE: Patients are usually 50-60 years old, with other neoplasm. The picture is marked by flushing, diarrhoea, abdominal cramp and disease of the right heart valve. DIAGNOSIS: Diagnosis is based on urinary dosage of 5-HIAA (n.v. > 10 mg/24 h.) that is higher than the normal value. Computed tomography and echography are useful. THERAPY: The small neoplasm are treated by local surgical resection, while the biggest tumors have been treated by pharmacological therapy with useless results.

How we teach and how they learn.

Residents need to learn how to assess and accommodate to a variety of behaviors and affective styles presented by patients and their families. This requires those skills which enable them to facilitate interactions with people in a positive, effective, and efficient manner. The teaching of these interpersonal and communication skills should incorporate a multi-disciplinary model. The development and implementation of a successful resident training program requires careful attention to the establishment of goals and objectives, learning activities and evaluation strategies that will meet the needs of the resident. The utilization of a multi-teaching, multi-media, and collaborative team approach intensifies the effectiveness of the overall training program. This article describes a training program that focuses on communication skills while being mindful of the various settings in which residency training occurs. These include the use of video-tape of physician/patient interaction in continuing care clinic, communication with children in non-medical settings and audio-tape reviews of physicians telephone management in a pediatric emergency care setting. The evaluation instruments developed to assess interpersonal and communications skills are reviewed and discussed as an integral component of this educational and training model.

A complete computerized program for nutritional management in the neonatal intensive care nursery.

A computerized program in BASIC, which integrates the infant's fluid and nutritional requirements per gestational age and weight with the infant's postpartum age, was developed using the Apple II Plus microcomputer, dual floppy disks, and an Epson printer. Daily requirements of fluids, proteins, fat, CHO, vitamins, minerals, and trace elements are computed. For reference, the program displays the composition and indications for intravenous and hyperalimentation solutions, mature human milk, and 14 commercial formulas. Safety limits to prevent overload or deficient formulations are strategically displayed, warning the physician about possible complications and gradually orienting him toward achieving adequate nutritional balance in the patient. The nutritional intake, weight, and other important clinical variables are stored and retrieved for future evaluation. The flexibility of the program allows for modifications in intravenous and oral composition according to clinical requirements. The program improves the efficiency of the arduous daily formulation of nutritional needs, reduces the possibility of human error, facilitates the calculation process, diminishes time spent on the calculations, and increases the ease of nutritional data retrieval and the development of output programs.

[Medically managed delivery under CT 1341 (althesin (Glaxo)) anesthesia]. / Il parto medico pilotato in narcosi con CT 1341 (althesin Glaxo).

The Authors, after illustrating the pharmacological and physiological characteristics of CT 1341 (Althesin Glaxo), have experimented this medicine in medico-piloted delivery under narcosis on two homogenous groups of 20 patients each. The Authors have evidenced the lack of any harmful effect on the proceeding of labour, the viability of the infant, the delivery of the placenta and on post-partum, provided that a time of induction not too premature with regard to the evolution of labour be respected.