METHODS: An exploratory review of past literatures on the usage of ultrasound technique in the diagnosis of acute appendicitis in adult patients, and the role of other imaging techniques were undertaken for the study.
RESULTS: The gold standard for the diagnosis of acute appendicitis still remains a histopathological confirmation after appendectomy. The study further shows imaging has high diagnostic accuracy in the diagnosis of acute appendicitis with low rate of negative appendectomy (<10%). Multiple reasons are identified, including the introduction of computed tomography imaging especially in those patients where ultrasound was unequivocal, more education on imaging which leads to better operator skill or improved performances of machines.
CONCLUSION: Imaging undoubtedly plays an important role in the diagnosis of acute appendicitis with ultrasound remaining the first-line method in patients referred with clinically suspected acute appendicitis. Nevertheless, those with borderline ultrasound findings or unable to visualize appendix on ultrasound with highly suspicious sign and symptoms were offered other imaging modalities such as CT scan.
RECOMMENDATION: It is recommended that the managing team balance the risk of radiation exposure, risk of delay in urgent operation and risk of perforation prior to a decision.
Method: In this study, we developed a rapid, sensitive and specific insulated isothermal Polymerase Chain Reaction (iiPCR) targeting bimA gene (Burkholderia Intracellular Motility A; BPSS1492) for the identification of B. pseudomallei. A pair of novel primers: BimA(F) and BimA(R) together with a probe were designed and 121 clinical B. pseudomallei strains obtained from numerous clinical sources and 10 ATCC non-targeted strains were tested with iiPCR and qPCR in parallel.
Results: All 121 B. pseudomallei isolates were positive for qPCR while 118 isolates were positive for iiPCR, demonstrating satisfactory agreement (97.71%; 95% CI [93.45-99.53%]; k = 0.87). Sensitivity of the bimA iiPCR/POCKIT assay was 97.52% with the lower detection limit of 14 ng/µL of B. pseudomallei DNA. The developed iiPCR assay did not cross-react with 10 types of non-targeted strains, indicating good specificity.
Conclusion: This bimA iiPCR/POCKIT assay will undoubtedly complement other methodologies used in the clinical laboratory for the rapid identification of this pathogen.
CASE PRESENTATION: A 59-year-old man of Chinese ethnicity presented to our hematology unit with headache, lethargy, and exertional dyspnea for the past 1 month. He underwent an uneventful cadaveric renal transplant 20 years ago for chronic glomerulonephritis-induced end-stage renal disease. He had been on long-term immunosuppressants since then consisting of orally administered prednisolone 10 mg daily and orally administered cyclosporine A 50 mg twice daily. On examination, he was pale with a palpable liver and spleen. He had a functioning renal graft. Marrow flow cytometry confirmed T-prolymphocytic leukemia with lymphocytes expressing CD2, CD3, CD7, CD52, and TCL-1. His human T-cell lymphotropic virus and Epstein-Barr virus serology and deoxyribonucleic acid (DNA) were negative. He was treated with one cycle of cyclophosphamide, doxorubicin, vincristine, and prednisone chemotherapy to which he failed to respond. In view of his renal allograft, he was not suitable for alemtuzumab due to the risk of nephrotoxicity. He was given orally administered venetoclax but he died on day 17 due to severe auto tumor lysis syndrome.
CONCLUSION: The place of immunophenotyping in the diagnosis and treatment of this disorder is of significant importance. More research needs to be carried out to further comprehend the pathophysiology and treatment modalities for this disorder.