Myocardial collagen concentration and nuclear magnetic resonance relaxation times in the spontaneously hypertensive rat.

In order to test the hypothesis that the increased myocardial collagen concentration in the older, spontaneously hypertensive (SH) rat is associated with altered T2 and T1, we performed in vitro studies of 70 left ventricles from 8-, 22-, and 33-week-old SH and Wistar-Kyoto (WKY) rats. We also measured the left ventricle/body weight (LV/BW) ratio (as a measure of hypertrophy), left ventricular water and fat content, and hydroxyproline concentration (as a measure of collagen). The LV/BW ration was not significantly different between 8-week-old SH rats and WKY rats but was significantly greater in SH rats than in WKY rats at 22 and 33 weeks of age. Comparing SH rats with WKY rats at 22 weeks of age, no significant difference existed in T1, T2, water content, or hydroxyproline concentration. However, at 33 weeks of age in SH rats compared with WKY rats, hydroxyproline concentration was significantly greater (4.3 +/- 0.6 mg/g, respectively; P less than .0005), water content was significantly greater (77.1% +/- 0.3% vs. 76.2% +/- 0.3%, respectively; P less than .0001), and T2 and T1 were significantly longer (T2: 52.6 +/- 2.1 msec vs. 48.6 +/- 2.2 msec, respectively; P less than .0001; T1: 656 +/- 14 msec vs. 619 +/- 12 msec, respectively; P less than .0001). In all SH rats combined, T2 and hydroxyproline concentration were significantly correlated (r = .63; P less than .0001). Thus, in SH rats, myocardial hypertrophy precedes increased collagen deposition. These data suggest that estimation of magnetic resonance relaxation times may permit noninvasive identification of increased myocardial collagen deposition independent from changes in myocardial hypertrophy.     

A Study of Lipid Peroxidation and Vitamin E in Dairy Cows with Hepatic Insufficiency

Sixteen dairy cows were studied to assess the status of the natural antioxidant vitamin E and lipid peroxidation in their livers. Cows with liver failure (n = 7) showed clinical signs of a hepatic encephalopathy and had the following values of selected blood indices: AST > 80 U/l and GLDH > 15 U/l in serum, and venous plasma ammonia > 35 mmol/l. The control group (n = 9) consisted of dairy cows which were recovering from surgery (omentopexy) and were free of any health complications. Blood was analysed for α-tocopherol, aspartate aminotransferase, glutamate dehydrogenase, γ-glutamyl transferase, total bilirubin, ammonia, cholesterol, albumin, free fatty acids, glucose, and β-hydroxybutyrate. Alpha-tocopherol, triglyceride and malondialdehyde were measured in wet liver tissue. The cows with hepatic failure were clearly low in α-tocopherol and had significantly lower (P < 0.01) plasma α-tocopherol than the controls. Both liver triglycerides and MDA were higher (P < 0.05) in the cows with fatty livers. It is concluded that the cows with liver failure had an increase in the intensity of hepatic lipoperoxidative processes and a low antioxidative status, which should be taken into consideration in cases where treatment of the disease is proposed.     

Occult pretransplantation systemic inflammation and posttransplantation vascular changes in a primate arterial allograft model

BACKGROUND: Occult systemic inflammation, as manifested by increased levels of C-reactive protein (CRP), identify patients at increased risk for renal allograft rejection. The mechanisms linking occult systemic inflammation to these adverse outcomes remain unclear. The purpose of this study was to examine the anatomic and physiologic effects of occult pretransplantation systemic inflammation on posttransplantation allograft outcome in a nonhuman primate model. METHODS: Seventy-one healthy male Rhesus macaques were stratified into quartiles based on serum CRP. Five high quartile and six low quartile animals underwent common iliac artery transplantation from male donors. Duplex ultrasound measured graft flow at 3 weeks postoperatively; luminal narrowing was assessed by graft/femoral peak systolic velocity ratio. At 6 weeks, the grafts were harvested and morphometry studies were performed. Vessel wall changes were assessed by measuring the intimal medial area. RESULTS: The allografts placed in high CRP quartile animals had more luminal narrowing by 3 weeks than those placed in low quartile animals, as evidenced by a higher mean graft/femoral peak systolic velocity ratio (1.6 vs. 0.90, P=0.006). Morphometry studies after graft harvest showed increased vessel wall area in the high quartile group versus the low quartile group (1.39 mm vs. 1.03 mm, P=0.018). CONCLUSIONS: Occult pretransplantation systemic inflammation is associated with increased intimal thickening and stenosis after arterial allograft transplantation in a primate model. Additional studies are needed to confirm these results and to further investigate potential mechanisms linking pretransplantation systemic inflammation to adverse outcomes after transplantation.     

Computed tomographic scanning reduces cost and time of complete spine evaluation

BACKGROUND: We hypothesize that data collected from computed tomographic (CT) scans obtained for workup of chest or abdominal injuries provide data that are sufficient to screen for spinal fractures and will decrease the cost and time of spine evaluation after trauma. METHODS: We reviewed plain radiographs from 55 selected trauma patients who also underwent CT scanning of the chest, abdomen, and pelvis. We also timed the radiologic workup of 50 consecutive trauma patients to determine the time required to complete radiographic spine evaluation. RESULTS: Forty-seven patients had thoracolumbar fractures. Thirteen patients were found to have 33 thoracolumbar spine fractures identified by CT scan but not plain radiography. Fractures were found on initial trauma CT scans of the chest, abdomen, and pelvis obtained to evaluate for visceral injuries. No injuries seen on plain film were missed on CT scan. CONCLUSION: We recommend using the data acquired from CT scans to evaluate the spine, supplementing them with additional studies only when needed for further clarification.     

Effect of xenon anaesthesia on accuracy of cardiac output measurement using partial CO2 rebreathing

Cardiac output (CO) determination based on partial CO(2) rebreathing has recently been introduced into clinical practice. The determination of flow is crucial for exact CO readings and the physical properties of xenon, i.e. high density and viscosity, may influence flow readings. This study compared echocardiography-derived CO measurements with the partial rebreathing method during total intravenous (TIVA) vs. xenon-based anaesthesia. Thirty-nine patients ASA physical status III undergoing aortic reconstruction were randomly assigned to receive either xenon (Xe, n = 20) or TIVA (T, n = 19) based general anaesthetic. Paired measurements were taken before xenon administration, after xenon administration, before and after clamping of the abdominal aorta and after declamping and at corresponding time points in the TIVA group. Data were analysed with a Bland-Altmann plot. Bias and precision were acceptable and comparable before xenon administration (T 0.54 +/- 0.92 l.min(-1) vs. Xe 0.11 +/- 1.1 l.min(-1)), but after xenon administration CO was largely overestimated by partial CO(2) rebreathing (T 0.04 +/- 0.91 l.min(-1) vs. Xe -4.0 +/- 2.1 l.min(-1)). In the TIVA group, bias and precision after declamping increased significantly (P < 0.01) compared to all time points except baseline. In its current application, the NICO cardiac output monitor appears to be inappropriate for determination of CO during xenon based anaesthesia.     

Estrogen receptor beta polymorphisms are associated with bone mass in women and men: the Framingham Study.

ESR2 is expressed in bone cells, yet few studies have tested its variation for association with BMD, an important determinant of osteoporotic fractures. This was investigated in 723 men and 795 women from the Framingham study. Results show association of variation in this gene with BMD in both women and men. INTRODUCTION: Osteoporotic fracture risk is highly dependent on bone density, a quantitative multifactorial trait with a substantial genetic component. In contrast to the growing body of evidence that estrogen receptor alpha (ESR1) plays a role in bone metabolism, few studies have examined the estrogen receptor beta (ESR2) gene for association with BMD. An ESR2 CA repeat polymorphism, D14S1026, was associated with BMD in two small studies, each with <200 women. MATERIALS AND METHODS: The objective of this investigation was to assess whether D14S1026 or four other intronic polymorphisms were associated with BMD in 723 men and 795 women (mean age, 60 years) from the offspring cohort of the population-based Framingham Study. BMD was measured at the femur (neck, trochanter, and Ward's area) and the lumbar spine (L(2)-L(4)). RESULTS: In both women and men, there was significant association of D14S1026 genotype with measures of femoral but not spinal BMD. In addition, genotypes of two common single nucleotide polymorphisms, rs1256031 and rs1256059, in strong linkage disequilibrium with one another but not with D14S1026, were associated with measures of femoral BMD in men. The rs1256031 genotypes had up to a 4.0% difference in mean femoral BMD. An inferred rs1256031-D14S1026-rs1256059 haplotype C-23CA-T was significantly associated with reduced femoral BMD in women (p = 0.03, 0.003, and 0.01 for neck, trochanter, and Ward's area, respectively). Haplotype-based BMD differences ranged from 3.0% to 4.3%. CONCLUSIONS: We have observed significant association of common ESR2 variants with measures of femoral BMD in both men and women.     

Comparison of outcomes and costs between laparoscopic distal pancreatectomy and open resection at a single center

Background  

The cost implications of laparoscopic distal pancreatectomy (LDP) and a detailed breakdown of hospital expenditures has not been presented in the literature to date. This study aimed to compare hospital costs and short-term clinical outcomes between LDP and open distal pancreatectomy (ODP).     

CT and MRI-based Diagnosis of Craniocervical Dislocations: The Role of the Occipitoatlantal Ligament

Background  

Craniocervical dislocations are rare, potentially devastating injuries. A diagnosis of craniocervical dislocations may be delayed as a result of their low incidence and paucity of diagnostic criteria based on CT and MRI. Delay in diagnosis may contribute to neurological injury from secondary displacement resulting from instability. The purpose of this study was to define CT and MRI-based diagnostic criteria for craniocervical dislocations to facilitate early injury recognition and stabilization.