Two-way trafficking of Annexin V positive cells between mother and fetus: determination of apoptosis at delivery.

OBJECTIVES: The aim of this study was to quantitate apoptosis in maternal circulation and umbilical cord blood (UCB) at delivery. The proportion of fetal cells in maternal blood as well as that of maternal cells in UCB was also determined. MATERIAL AND METHODS: Three milliliters of peripheral blood was collected from nine women during labor. Five women delivered males and four delivered females. Immediately after delivery, 3 mL UCB was collected. Ten microliters was used to quantitate apoptosis by the ethidium bromide assay (EthBr) and from the remaining blood, Annexin V positive cells were isolated by MACS. RESULTS: The Median apoptosis rate in maternal samples was 25% (19-34) and in UCB 20% (16-28). Annexin V positive cells were present in all samples analyzed. As shown by Fluorescence in situ hybridization (FISH) in maternal samples, cells with an XY hybridization pattern were identified in cases with male newborns in a median concentration of 1.7% (1.6-2.1). On the corresponding UCB, a median of 1.2% (0.8-1.6) XX cells were detected. CONCLUSION: The study demonstrates the existence of a bidirectional transfer of fetal and maternal cells under apoptosis across the placenta and provides useful information regarding use of UCB for transplantation.

Acute mediastinitis: spectrum of computed tomography findings.

The objective of this study was to describe CT findings and to determine the diagnostic value of CT in diagnosis of acute mediastinitis. CT findings were retrospectively studied in 40 patients with suspected acute mediastinitis, including 28 postoperative patients, five with acute descending necrotizing mediastinitis (ADNM), and seven with suspected post-traumatic perforation of the esophagus. Findings included increased attenuation of mediastinal fat (100%), localized mediastinal fluid collections (55%), free gas bubbles in the mediastinum (57.5%), mediastinal lymph nodes (35%), pericardial effusions (27.5%), pleural effusions (85%), lung infiltrates (35%), sternal dehiscence (40%), and pleuromediastinal fistula (2.5%). The sensitivity and specificity of CT in postoperative patients in the first 17 days was 100% and 33% respectively, and after day 17, 100% and 90%. In patients with ADNM sensitivity was 100% while in patients with suspected esophageal perforation sensitivity and specificity were 100%. CT is a highly sensitive technique for the detection of mediastinitis of various causes. For the postoperative patients there is clear time dependence for CT interpretation and accuracy. In patients with suspected ADNM, and traumatic esophageal perforation CT is highly specific early after clinical presentation.

Stereotactic biopsy in the era of advanced neuroimaging. Does the minimal therapeutic gain justify its current wide use?

OBJECTIVE: This study reviewed the contribution of stereotactic brain biopsy in the management and final outcome of a series of patients with presumed inoperable lesions. PATIENTS AND METHODS: Sixty-nine consecutive patients underwent a CT-guided lesion biopsy (n = 67) or abscess/cyst aspiration (n = 2) using the Cosman-Roberts-Wells (CRW) frame. RESULTS: A definitive specific diagnosis was made in 53 of 67 patients (79 %). The remaining procedures did not provide a diagnosis because of failure to obtain appropriate specimen (11 patients), findings consistent with non-specific inflammation (2 patients) or uneventful surgical complication requiring termination of the procedure (1 patient). A total of 55 patients (80 %) died due to the malignant nature of the lesion, most within six months after the biopsy. The preoperative imaging diagnosis was consistent with the histological diagnosis in 60 patients (87 % accuracy). The perioperative morbidity and mortality were nil and most of the patients were discharged within twenty-four hours. CONCLUSIONS: The stereotactic biopsy did not alter either the therapeutic management or the mortality due to the natural course of the lesion. These findings indicate that the current principle of mandatory histological diagnosis in virtually all non-resectable brain lesions should be re-evaluated taking into account parameters such as: age, medical/neurological status, neuroimaging characteristics, patients' best interest and health care financial shortages.