Background Posterior reversible encephalopathy syndrome (PRES) is a clinical-radiologic entity characterized by headaches, altered mental status, seizures, visual loss, and a characteristic imaging pattern in brain magnetic resonance images. The exact etiology and pathogenesis of this condition are not yet fully elucidated. Case presentation A 72-year-old White man presented with 2 weeks of low-grade fever and chills, night sweats, fatigue, dysphagia, and new-onset rapidly increasing cervical lymphadenopathy. He had a history of chronic lymphocytic leukemia with transformation to diffuse large B-cell lymphoma for which he was started on dose-adjusted rituximab, etoposide, prednisone vincristine, cyclophosphamide, and doxorubicin (DA-R-EPOCH). Shortly after treatment initiation, the patient developed severe airway obstruction due to cervical lymphadenopathy that required emergency intubation. A few days later, the cervical lymphadenopathy and the status of the airway improved, and sedation was consequently weaned off to plan for extubation. However, the patient did not recover consciousness and developed generalized refractory seizures. Brain magnetic resonance imaging revealed edema in the cortical gray and subcortical white matter of the bilateral occipital and inferior temporal lobes, consistent with PRES. Conclusions Posterior reversible encephalopathy syndrome refers to a neurological disorder and imaging entity characterized by subcortical vasogenic edema in patients who develop acute neurological signs and symptoms of a usually reversible nature in different settings, including chemotherapy. Despite its name, PRES is not always fully reversible, and permanent sequelae can persist in some patients. Clinicians should be aware of the possible association between chemotherapy and PRES to ensure early recognition and timely treatment.
Background Hospital-acquired (HA) Clostridioides difficile infection (CDI) is among the most common hospital-acquired infections and is a leading cause of morbidity and mortality among hospitalized older adults. Oral vancomycin prophylaxis (OVP) has been demonstrated in recent studies to reduce the incidence of HA CDI. This study aims to evaluate the effectiveness of OVP in the prevention of HA CDI in a community hospital setting. Methods We developed a protocol to administer prophylactic oral vancomycin based on patients’ risk factors and implemented it at our community hospital in Evanston, Illinois, in September 2020. The intervention group consists of patients admitted to our hospital between October 1, 2020, to March 31, 2021, who received OVP. Patients admitted between October 1, 2019, to March 31, 2020, who had at least one risk factor of CDI and met the inclusion criteria of OVP protocol were selected as the control group. Electronic medical records were retrospectively collected and analyzed. Propensity score matching was performed for a one-to-one match between two groups. Logistic regression models were used to study the relationship between HA CDI and independent variables, including OVP, risk factors of CDI, and demographic characteristics. Table 1.Sample characteristics of the control and intervention groups A Student t-test was performed for continuous parameters. A Chi-square test was performed for categorical parameters. Non PPx = control group; OVP PPx = oral vancomycin prophylaxis group; SNF = skilled nursing facility; LOS = length of stay; PPI = proton pump inhibitor; H2RA = histamine 2 receptor antagonist. Results A total of 446 patients (267 in the intervention group and 179 in the control group) were included. The sample characteristics are summarized in Table 1. 4/175 (2.2%) patients in the control group developed HA CDI, compared with 12/255 (4.5%) in the intervention group. Before matching, patients who received OVP (OR=7.62, p=0.010) and had a longer length of stay (LOS, OR=1.11, p=0.002) were found to have increased odds ratios (OR) of development of HA CDI (Table 2). After propensity score matching, 4/176 (2.3%) patients in the control group developed HA CDI, compared with 5/176 (2.8%) (Figure 1). Patients from skilled nursing facilities (SNF, OR=15.41, p=0.021) and with longer LOS (OR 1.15, p=0.005) were found to be associated with higher OR of HA CDI (Table 3). Table 2.The odds ratio of development of hospital-acquired C.diff infection among control and intervention groups. A binary logistic regression model was used for this study. CI = 95% confidence interval. R2 Tujur = coefficients of determination (D); AIC = Akaike’s Information Criteria. OVP PPx = oral vancomycin prophylaxis group; SNF = skilled nursing facility; LOS = length of stay; PPI = proton pump inhibitor; H2RA = histamine 2 receptor antagonist. Figure 1.Propensity score matching of control and intervention groups. (A) Distribution of propensity scores between unmatched and matched control and intervention groups. (B) Distribution balance of propensity score before and after matching. Treatment o = control group; Treatment 1 = OVP intervention group. (C) The distribution balance of covariates used for propensity score calculation before and after matching. (D) Summary of propensity score matching results. HA CDI = hospital-acquired C.diff infection (after propensity score matching). Table 3.The odds ratio of development of hospital-acquired C.diff infection among control and intervention groups after propensity score matching. A binary logistic regression model was used for this study. CI = 95% confidence interval. R2 Tujur = coefficients of determination (D); AIC = Akaike’s Information Criteria. OVP PPx = oral vancomycin prophylaxis group; SNF = skilled nursing facility; LOS = length of stay; PPI = proton pump inhibitor; H2RA = histamine 2 receptor antagonist. Conclusion Prophylactic administration of oral vancomycin to patients with selected risk factors has no statistical significance in reducing or preventing HA CDI. A longer length of hospital stay may be associated with higher risk for developing HA CDI. Disclosures All Authors: No reported disclosures.
Myeloid sarcoma (MS) is an extra-medullary solid tumor consisting of myeloid blasts or immature myeloid cells. MS is usually associated with acute myeloid leukemia (AML) and other myeloproliferative neoplasms or myelodysplastic disorders. Isolated MS is a rare clinical entity, and the small bowel is a rare phenomenon for the occurrence of MS. A 30-year-old African American female patient with a past medical history of asthma presented with acute abdominal pain and vomiting for 3 days. Imaging revealed small bowel obstruction with a transition point at a suspicious mass in the distal ileum mimicking carcinoid tumors. She underwent an uneventful laparoscopic resection of this mass with primary bowel anastomosis. Histopathology of the resected mass revealed immature myeloid cells that stained positive for myeloperoxidase and CD34/CD117, in keeping with a small bowel MS. A bone marrow examination was negative for concurrent AML. Cytogenetic analysis revealed MYH11/CBFB fusion and an inversion 16 chromosomal aberration which are rarely associated with myeloid disorders. The patient was commenced on systemic chemotherapy to achieve remission and prevent progression to AML. The literature is reviewed, and all cases of small bowel MS are presented in this report. Non-leukemic small bowel MS is an exceptional presentation. We described a case of isolated enteric MS, which was associated with a rare MYH11/CBFB fusion and inversion 16 chromosomal aberration. The diagnosis of small bowel MS can be extremely challenging due to the rarity of the disease and non-specific nature of clinical and radiological features. A histopathological examination with immunohistochemistry staining is imperative to establish an accurate diagnosis. Isolated small bowel MS deserves special attention as it warrants systemic chemotherapy to prevent transformation into AML.
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