M ycobacterium avium complex genomics and transmission in a London hospital.

BACKGROUND: Non-tuberculous mycobacteria (NTM) are environmental microorganisms and opportunistic pathogens in individuals with pre-existing lung conditions such as cystic fibrosis (CF) and non-CF bronchiectasis. While recent studies of Mycobacterium abscessus have identified transmission within single CF centres as well as nationally and globally, transmission of other NTM species is less well studied. METHODS: To investigate the potential for transmission of the Mycobacterium avium complex (MAC) we sequenced 996 isolates from 354 CF and non-CF patients at the Royal Brompton Hospital (London, UK; collected 2013-2016) and analysed them in a global context. Epidemiological links were identified from patient records. Previously published genomes were used to characterise global population structures. RESULTS: We identified putative transmission clusters in three MAC species, although few epidemiological links could be identified. For M. avium, lineages were largely limited to single countries, while for Mycobacterium chimaera, global transmission clusters previously associated with heater-cooler units (HCUs) were found. However, the immediate ancestor of the lineage causing the major HCU-associated outbreak was a lineage already circulating in patients. CONCLUSIONS: CF and non-CF patients shared transmission chains, although the lack of epidemiological links suggested that most transmission is indirect and may involve environmental intermediates or asymptomatic carriage in the wider population.

Hb S (HBB: c.20A>T) Characteristics by High Performance Liquid Chromatography in Patients with Sickle Cell Disease Receiving the Novel Agent Voxelotor.

Voxelotor is a novel agent in the management of sickle cell disease. It is an inhibitor of Hb S (HBB: c.20A>T) polymerization that reversibly binds to hemoglobin (Hb), stabilizing it in the oxygenated state that has been shown to reduce hemolysis and to improve anemia. Four patients in our institution are receiving treatment with Voxelotor as part of clinical studies. All four showed a characteristic change in the appearance of Hb S by high performance liquid chromatography (HPLC) soon after commencing treatment. A second peak was identified eluting at the Hb D window. Cellulose acetate membrane and agar gel electrophoresis only identified a band at the Hb S position. The patients' Hb level or clinical conditions were not adversely affected. Our findings indicate that patients receiving Voxelotor invariably display this unique pattern by HPLC. As there will be an increasing number of patients treated with this agent, it is important to be aware of this characteristic HPLC appearance for diagnostic and treatment monitoring purposes.

A Laboratory Medicine Best Practices Systematic Review and Meta-analysis of Nucleic Acid Amplification Tests (NAATs) and Algorithms Including NAATs for the Diagnosis of Clostridioides (Clostridium) difficile in Adults.

The evidence base for the optimal laboratory diagnosis of Clostridioides (Clostridium) difficile in adults is currently unresolved due to the uncertain performance characteristics and various combinations of tests. This systematic review evaluates the diagnostic accuracy of laboratory testing algorithms that include nucleic acid amplification tests (NAATs) to detect the presence of C. difficile The systematic review and meta-analysis included eligible studies (those that had PICO [population, intervention, comparison, outcome] elements) that assessed the diagnostic accuracy of NAAT alone or following glutamate dehydrogenase (GDH) enzyme immunoassays (EIAs) or GDH EIAs plus C. difficile toxin EIAs (toxin). The diagnostic yield of NAAT for repeat testing after an initial negative result was also assessed. Two hundred thirty-eight studies met inclusion criteria. Seventy-two of these studies had sufficient data for meta-analysis. The strength of evidence ranged from high to insufficient. The uses of NAAT only, GDH-positive EIA followed by NAAT, and GDH-positive/toxin-negative EIA followed by NAAT are all recommended as American Society for Microbiology (ASM) best practices for the detection of the C. difficile toxin gene or organism. Meta-analysis of published evidence supports the use of testing algorithms that use NAAT alone or in combination with GDH or GDH plus toxin EIA to detect the presence of C. difficile in adults. There is insufficient evidence to recommend against repeat testing of the sample using NAAT after an initial negative result due to a lack of evidence of harm (i.e., financial, length of stay, or delay of treatment) as specified by the Laboratory Medicine Best Practices (LMBP) systematic review method in making such an assessment. Findings from this systematic review provide clarity to diagnostic testing strategies and highlight gaps, such as low numbers of GDH/toxin/PCR studies, in existing evidence on diagnostic performance, which can be used to guide future clinical research studies.

Integrating Motivational Interviewing Into a Home Telehealth Program for Veterans With Posttraumatic Stress Disorder Who Smoke: A Randomized Controlled Trial.

OBJECTIVE: We evaluated integrating a motivational interviewing (MI)-based smoking cessation curricula and MI counseling into a posttraumatic stress disorder (PTSD) home telehealth care management program to determine if smoking behaviors improved. METHOD: We randomized 178 Veterans with PTSD to a 90-session MI-based home telehealth program or to usual care. Outcome measures included self-reported 24-hour quit attempts, seven-day point prevalence abstinence, progression along the stages of change, and mental health symptoms. RESULTS: Favorable smoking cessation rates were observed in both groups. There was no statistical difference in self-reported 24-hour quit attempts, seven-day point prevalence smoking abstinence or progression along the stages of change. The intervention group showed improved depression and PTSD symptoms. CONCLUSION: Integrating MI-based smoking cessation treatment into PTSD home telehealth is an effective method to help Veterans with PTSD quit smoking. Further research is needed to understand how to optimize MI integration into home telehealth to achieve sustained smoking cessation rates.

18-FDG PET/ CT Scan in the Diagnosis and Follow-up of Chronic Q fever Aortic Valve Endocarditis.

Chronic Q fever endocarditis is a rare but important infection associated with risk of morbidity and mortality. Echocardiography rarely visualises the vegetative lesion. We describe the first Australian report of chronic Q fever aortic valve endocarditis confirmed with the use of 18 -FDG PET/ CT scan. Following valvular replacement, the patient had ongoing high serological titres despite active treatment and he was managed with yearly serial PET/ CT scan to confirm the absence of active infection. The utility of serial PET /CT scan imaging as a follow-up management strategy has not been described in the literature previously and should be investigated further.

Building a tobacco cessation telehealth care management program for veterans with posttraumatic stress disorder.

BACKGROUND: Veterans with posttraumatic stress disorder (PTSD) have high rates of smoking. Motivational interviewing (MI) enhances readiness for change. OBJECTIVE: To test the feasibility and fidelity of home telehealth care management strategy to improve quit rates. DESIGN: A telehealth device delivered a cessation curriculum while a nurse supported veterans through weekly MI telephone calls. Treatment fidelity was evaluated. Outcomes measures included changes in smoking behaviors, stage of change, dose effect, and participant satisfaction with intervention. RESULTS: There was a correlation (r = -.677; p = .03) at the end of treatment between readiness to change and number of cigarettes smoked per day. As 11 participants progressed along stages of change, they smoked fewer cigarettes per day. Two (20%) quit smoking. The nurse adhered to MI principles. Participants were highly satisfied and 100% felt curriculum delivered new information and respected choices. CONCLUSIONS: It was feasible to deliver the home telehealth care management intervention with high treatment fidelity. Participants were motivated to change smoking behaviors.

Clinical and radiological predictors of outcome for Murray Valley encephalitis.

A review of the laboratory-confirmed cases of Murray Valley encephalitis (MVE) from Western Australia between 2009 and 2011 was conducted to describe the clinical, laboratory, and radiological features of the disease. The nine encephalitis patients presented with altered mental state and seizures, tremor, weakness, or paralysis. All patients developed a raised C-reactive protein, whereas most developed acute liver injury, neutrophilia, and thrombocytosis. All patients with encephalitis developed cerebral peduncle involvement on early magnetic resonance imaging (MRI). The absence of thalamic MRI hyperintensity during the acute illness, with or without leptomeningeal enhancement, predicted a better neurological outcome, whereas those patients with widespread abnormalities involving the thalamus, midbrain, and cerebral cortex or the cerebellum had devastating neurological outcomes. MRI scans repeated months after acute illness showed destruction of the thalamus and basal ganglia, cortex, or cerebellum. These findings may help clinicians predict the neurological outcome when evaluating patients with MVE.

Nutrition risk screening in acute care: a survey of practice.

The Joint Commission-accredited acute care hospitals are required to screen patients for nutrition risk, but criteria and procedures in use have not been described. The purpose of this study was to survey managers of clinical nutrition services in acute care hospitals regarding procedures for screening for nutrition risk. Members of the Clinical Nutrition Management Dietetic Practice Group were surveyed using an e-mailed link to an electronic survey. Of 1668 members contacted, 522 usable surveys were completed (31%). Most respondents (84%) reported that nursing staff had primary responsibility for nutrition screening; 10% used nutrition services staff; 4% used a computerized system. Where nursing staff did nutrition screening (n=441), 57% (n=252) said that nutrition services staff do a secondary admission screen. Dietitians most often performed secondary screens (70%), followed by dietetic technicians (16%), 4-year-degreed staff (4%), and clerks (3%). Most nutrition services staff screens (61%) used different data than nursing staff screens; 12% collected the same data as nursing staff. Screening criteria most often used by nursing staff were a history of weight loss (95%), poor intake prior to admission (81%), nutrition support (79%), chewing/swallowing issues (75%), and skin breakdown (72%). Criteria most commonly used by nutrition services staff were diagnosis (90%), nutrition support (81%), nothing by mouth (NPO)/clear liquid diet order (78%), visceral proteins (71%), and specific diet orders (68%). Most respondents had not formally evaluated their screening systems for sensitivity or specificity. There is a need to further evaluate the nutrition screening systems used in acute care hospitals in the U.S.