RESUMO
We report a case in which a 34-year-old female with refractory intracranial hypotension headaches due to a spontaneous dural tear was ultimately treated with CT-guided transforaminal epidural placement of a synthetic absorbable sealant (DuraSeal®). The procedure successfully resolved her headaches; however she subsequently developed thoracic neuralgia presumably due to mass effect of the sealant material on the lower thoracic spinal cord and nerve roots. This case report describes the potential for significant spinal cord and nerve root compression as well as the development of chronic neuralgia with the placement of epidural hydrogel and fibrin glue sealants. Careful consideration should be taken into the needle gauge, needle position, injectate volumes, and injection velocity when delivering the sealant to the epidural space. Use of an 18-gauge Tuohy needle with a slow but steady injection pressure, constant patient feedback, and a conservative injectate volume (less than 2 ml per level) may best optimize sealant delivery to minimize the risk of spinal cord compression and neurologic injury.
RESUMO
BACKGROUND: Ischemia-reperfusion (I/R) injury is a multifactorial phenomenon that occurs during the transplant event and frequently compromises early graft function after liver transplantation (LT). Current comprehension of molecular mechanisms and regulation processes of I/R injury lacks clarity. MicroRNA (miRNA) regulation results critical in several biological processes. METHODS: This study evaluated gene expression and miRNA expression profiles using microarrays in 34 graft biopsies collected at preimplantation (L1) and at 90 min postreperfusion (L2) from consecutives deceased-donor LT recipients. miRNA profiles were first analyzed. Data integration analysis (gene expression/miRNA expression) aimed to identify potential target genes for each identified miRNA from the L1/L2 differential gene expression profile. RESULTS: Pairwise comparison analyses identified 40 miRNAs and 3168 significantly differentially expressed genes at postreperfusion time compared with preimplantation time. Pathway analysis of miRNAs associated these profiles with antiapoptosis, inhibition of cellular proliferation, and proinflammatory processes. Target analysis identified an miRNA-associated molecular profile of 2172 genes involved in cellular growth and proliferation modulation by cell cycle regulation, cell death and survival, and proinflammatory and anti-inflammatory processes. miRNA-independent genes involved proinflammatory molecules. CONCLUSION: We identified a miRNA profile involved in posttranscriptional regulatory mechanisms in I/R injury post-LT. A better understanding of these molecular processes involved in I/R may contribute to develop new strategies to minimize graft injury.
