Cardiovascular effects produced by microinjection of angiotensins and angiotensin antagonists into the ventrolateral medulla of freely moving rats

In this study we determined the cardiovascular effects produced by microinjection of angiotensin peptides [Angiotensin-(1–7) and Angiotensin II] and angiotensin antagonists (losartan, L-158,809, CGP 42112A, Sar¹-Thr⁸-Ang II, A-779) into the rostral ventrolateral medulla of freely moving rats. Microinjection of angiotensins (12.5–50 pmol) produced pressor responses associated to variable changes in heart rate, usually tachycardia. Unexpectedly, microinjection of both AT₁ and AT₂ ligands produced pressor effects at doses that did not change blood pressure in anesthetized rats. Conversely, microinjection of Sar¹-Thr⁸-Ang II and the selective Ang-(1–7) antagonist, A-779, produced a small but significant decrease in MAP an HR. These findings suggest that angiotensins can influence the tonic activity of vasomotor neurons at the RVLM. As previously observed in anesthetized rats, our results further suggest a role for endogenous Ang-(1–7) at the RVLM. The pressor activity of the ligands for AT₁ and AT₂ angiotensin receptor subtypes at the RVLM, remains to be clarified.     

Staging of regional lymph nodes in melanoma patients by means of 99mTc-MIBI scintigraphy.

Most first relapses in patients with melanoma occur in regional lymph node basins. Such lesions are frequently diagnosed clinically during the first 2 y of follow-up. In the last few years, our group has been studying the usefulness of (99m)Tc-methoxyisobutylisonitrile (MIBI) scintigraphy in the evaluation of recurrent melanoma lesions. The aim of the present study was to prospectively evaluate the clinical value of (99m)Tc-MIBI scintigraphy in the diagnosis of subclinical nodal metastases. METHODS: We included 66 patients within 3 mo of melanoma diagnosis, with Breslow thickness > 1.0 mm, all treated with wide local excision of the primary lesion. When (99m)Tc-MIBI scanning was performed, 49 of them did not have evidence of nodal disease, and 17 had clinically questionable regional lymph node lesions. Planar images of lymph node regions were acquired 10 min after injection, using a dose of 740-1,110 MBq and a large-field-of-view gamma camera equipped with a low-energy high-resolution collimator. Scan findings were confirmed by pathology or by clinical follow-up (median, 35 mo). RESULTS: Thirty of 33 patients with regional lymph node metastases received a correct diagnosis, 14 with palpable lesions and 16 with nonpalpable lesions. In 3 cases that were initially (99m)Tc-MIBI negative, nodal metastases were found during follow-up. The following diagnostic values were calculated: sensitivity, 0.91 (95% confidence interval [CI], 0.75-0.98); specificity, 0.85 (95% CI, 0.67-0.94); likelihood ratio of a positive test, 6.0 (95% CI, 2.7-13.5); and likelihood ratio of a negative test, 0.11 (95% CI, 0.036-0.32). CONCLUSION: (99m)Tc-MIBI scanning may have a secondary role in the staging of regional lymph nodes in patients with clinically localized melanoma who are not good candidates for sentinel node biopsy.     

Diabetic mastopathy: a case report

Diabetic mastopathy (DMP) is an uncommon collection of clinical, radiological, and histological features, classically described in premenopausal women with long-term insulin-dependent diabetes mellitus. This entity can mimic breast carcinoma, but, in the appropriate clinical and imaging setting, the diagnosis can be made by core biopsy, avoiding unnecessary surgeries. We report the case of a 34-year-old female, with a 12-year history of type 1 diabetes, who presented with bilateral breast lumps. Mammography, ultrasonography, and magnetic resonance imaging could not exclude the suspicion of malignancy, and a core biopsy was performed showing the typical histologic features of DMP. The literature is briefly reviewed.     

Re‐examination of the Lymphocytotoxic Crossmatch in Liver Transplantation: Can C4d Stains Help in Monitoring?

C4d-assisted recognition of antibody-mediated rejection (AMR) in formalin-fixed paraffin-embedded tissues (FFPE) from donor-specific antibody-positive (DSA+) renal allograft recipients prompted study of DSA+ liver allograft recipients as measured by lymphocytotoxic crossmatch (XM) and/or Luminex. XM results did not influence patient or allograft survival, or cellular rejection rates, but XM+ recipients received significantly more prophylactic steroids. Endothelial C4d staining strongly correlates with XM+ (<3 weeks posttransplantation) and DSA+ status and cellular rejection, but not with worse Banff grading or treatment response. Diffuse C4d staining, XM+, DSA+ and ABO- incompatibility status, histopathology and clinical-serologic profile helped establish an isolated AMR diagnosis in 5 of 100 (5%) XM+ and one ABO-incompatible, recipients. C4d staining later after transplantation was associated with rejection and nonrejection-related causes of allograft dysfunction in DSA- and DSA+ recipients, some of whom had good outcomes without additional therapy. Liver allograft FFPE C4d staining: (a) can help classify liver allograft dysfunction; (b) substantiates antibody contribution to rejection; (c) probably represents nonalloantibody insults and/or complete absorption in DSA- recipients and (d) alone, is an imperfect AMR marker needing correlation with routine histopathology, clinical and serologic profiles. Further study in late biopsies and other tissue markers of liver AMR with simultaneous DSA measurements are needed.     

Impact of chronic endometritis in infertility: a SWOT analysis

Chronic endometritis is a pathology often associated with reproductive failure, but there are still no clear recommendations on whether its inclusion in the initial study of infertile couples is necessary. In this discussion paper, based on a SWOT (Strengths, Weaknesses, Opportunities, Threats) analysis, the different aspects of the repercussions of chronic endometritis in fertility are evaluated. To avoid possible subjectivity in the analysis and results of this study, the researchers followed the Oxford criteria for the evaluation of evidence. The results from the evaluation of the reviewed literature seem to indicate that, pending new evidence, it would be advisable not to include chronic endometritis in the initial baseline study before assisted reproduction in order not to delay other assisted reproduction treatments. However, it would be advisable in cases of repetitive implantation failure and pregnancy loss after having undergone IVF with viable embryos and before continuing with costly reproductive processes, since results could be improved. The development of randomized studies assessing the impact of antibiotic treatment as a possible therapeutic option in infertile women with chronic endometritis, as well as the possible impact on endometrial microbiota and receptivity/implantation, would allow for the establishment of more precise clinical guidelines in this regard.     

Elastic properties of stored red blood cells from sickle trait donor units

BACKGROUND AND OBJECTIVES: Red blood cells (RBCs) from patients with sickle cell disease present reduced deformability. The aim of this study was to analyse the elasticity of stored RBCs from patients with the sickle cell trait (AS). MATERIALS AND METHODS: The cell elasticity was studied, using laser optical tweezers, on storage days 1, 14, 21, 28 and 35. RESULTS: The elasticity of RBC from AS units stored for 1, 14 and 21 days was significantly greater compared with that of control RBC cells stored for the same time-period. More than 30% of the cells from AS units stored for 28 or 35 days were very rigid and escaped from the optical trap. CONCLUSIONS: RBCs became rigid during storage, suggesting that haemoglobin S might compromise the cell elasticity.     

Laparoscopic cholecystectomy in patients with liver cirrhosis

BACKGROUND: Initially considered a contraindication to the surgical laparoscopy, cirrhosis have been an occasional discovery during this procedure. Until now many series reported in the literature suggest that the majority of the surgeons still consider cirrhosis as contraindication to the laparoscopic cholecystectomy. AIM: To evaluate our experience in laparoscopic treatment of the cholelithiasis in cirrhotic patient. PATIENTS AND METHODS: Six hundred and four patients with symptomatic cholelithiasis were operated on Clinical and Surgical Gastroenterology Unit, "Santa Casa de Misericórdia de Porto Alegre", Porto Alegre, RS, Brazil, during the period from May 1993 to May 2000. Of these, 10 (1,6%) presented hepatic cirrhosis. The patients' age was between 22 and 69 years (average of 50,4 +/- 18,1). Eight patients (80%) were female. The alcohol was the etiological factor in four, chronic hepatitis B and C, primary biliary cirrhosis and of alfa-1 antitripsin deficiency in one patient each. In two patient the causal agent was not identified. RESULTS: Cholecystectomy was accomplished in all patients and in seven also diagnostic hepatic biopsy. In two (20%) the surgery was converted. The result of the intraoperative cholangiography was normal in all cases. In seven patients the postoperative was uneventfull. Clinically controlled ascite was observed in two (20%). Both were Child A at the moment of the surgery. The last patient, Child C, died. He presented irreversible hepatic failure. CONCLUSIONS: Despite larger experience still should be acquired, it seems that laparoscopic is a safe approach in well compensated cirrhotic patients with symptomatic cholelithiasis. In Child C patients we believed that all of the efforts should be driven to the improvement of the hepatic function or a less invasive method such as cholecystostomy.