Waterpipe smoking: not as innocent as it may seem.

INTRODUCTION: Waterpipe (hookah) smoking is popular; in Dutch surveys, 26% of the respondents have smoked a waterpipe at least once. However, waterpipe smoking is not without risk. We present a series of carbon monoxide (CO) poisonings after waterpipe smoking and discuss the etiology and treatment of CO intoxication after waterpipe smoking. CASE DESCRIPTIONS: We present three patients who presented with syncopial episodes and a variety of other neurological and circulatory symptoms after smoking a waterpipe. All patients had significantly elevated carboxyhaemoglobin levels (26%, 19% and 26%). Patients were treated with oxygen, following Dutch guidelines; one patient was admitted for eight hours of oxygen therapy. The other two patients were observed shortly, diverging from the guidelines because symptoms passed and the carboxyhaemoglobin normalised. DISCUSSION: Reviewing combustion chemistry, the formation of CO is a logical consequence of using burning coals as a heat source. This is due to CO2 reduction with carbon. This chemical process has not previously been related to waterpipe smoking. Dutch guidelines advise eight hours of oxygen therapy. The research this guideline is based on, justifies therapy directed at symptom relief and carboxyhaemoglobin normalisation. This strategy may prevent unnecessary hospital admissions and exposure to high-dose oxygen. CONCLUSION: We described three cases of CO intoxication after waterpipe smoking and argue why this may not be an incidental finding. Greater awareness of this risk is urgently needed. We conclude that the literature does not firmly support a fixed treatment duration.

Identifying patients with bacterial infections using a combination of C-reactive protein, procalcitonin, TRAIL, and IP-10 in the emergency department: a prospective observational cohort study.

OBJECTIVES: The aim was to effectively reduce the unnecessary use of broad spectrum antibiotics in the emergency department (ED), patients with bacterial infections need to be identified accurately. We investigated the diagnostic value of a combination of biomarkers for bacterial infections, C-reactive protein (CRP), and procalcitonin (PCT), together with biomarkers for viral infections, tumour necrosis factor-related apoptosis-inducing ligand (TRAIL), and interferon-gamma-induced protein-10 (IP-10), in identifying suspected and confirmed bacterial infections in a general ED population with fever. METHODS: This is a sub-study in the HiTEMP cohort. Patients with fever were included during ED triage, and blood samples were obtained. Using both diagnostics and expert panel analysis, all patients were classified as having either suspected or confirmed bacterial infections, or non-bacterial disease. Using multivariable logistic regression analysis, three biomarker models were analysed: model 1, CRP, TRAIL, IP-10; model 2, PCT, TRAIL, IP-10; and model 3, CRP, PCT, TRAIL, IP-10. RESULTS: A total of 315 patients were included, of whom 228 patients had a suspected or confirmed bacterial infection. The areas under the curve for the combined models were the following: model 1, 0.730 (95% CI 0.665-0.795); model 2, 0.748 (95% CI 0.685-0.811); and model 3, 0.767(95% CI 0.704-0.829). CONCLUSIONS: These findings show that a combination of CRP, PCT, TRAIL and IP-10 can identify bacterial infections with higher accuracy than single biomarkers and combinations of a single bacterial biomarkers combined with TRAIL and IP-10.

Procalcitonin-guided antibiotic therapy in patients with fever in a general emergency department population: a multicentre non-inferiority randomized clinical trial (HiTEMP study).

OBJECTIVES: Overuse of broad-spectrum antibiotics in emergency departments (EDs) results in antibiotic resistance. We determined whether procalcitonin (PCT) -guided therapy can be used to reduce antibiotic regimens in EDs by investigating efficacy, safety and accuracy. METHODS: This was a non-inferiority multicentre randomized clinical trial, performed in two Dutch hospitals. Adult patients with fever ≥38.2°C (100.8°F) in triage were randomized between standard diagnostic workup (control group) and PCT-guided therapy, defined as standard workup with the addition of one single PCT measurement. The treatment algorithm encouraged withholding antibiotic regimens with PCT <0.5 µg/L, and starting antibiotic regimens at PCT ≥0.5 µg/L. Exclusion criteria were immunocompromised conditions, pregnancy, moribund patients, patients <72 h after surgery or requiring primary surgical intervention. Primary outcomes were efficacy, defined as number of prescribed antibiotic regimens; safety, defined as combined safety end point consisting of 30 days mortality, intensive-care unit admission, ED return visit within 2 weeks; accuracy, defined as sensitivity, specificity and area-under-the-curve (AUC) of PCT for bacterial infections. Non-inferiority margin for safety outcome was 7.5%. RESULTS: Between August 2014 and January 2017, 551 individuals were included. In the PCT-guided group (n = 275) 200 (73%) patients were prescribed antibiotic regimens, in the control group (n = 276) 212 (77%) patients were prescribed antibiotics (p 0.28). There was no significant difference in combined safety end point between the PCT-guided group, 29 (11%), and control group, 46 (16%) (p 0.16), with a non-inferiority margin of 0.46% (n = 526). AUC for confirmed bacterial infections for PCT was 0.681 (95% CI 0.633-0.730), and for CRP was 0.619 (95% CI 0.569-0.669). CONCLUSIONS: PCT-guided therapy was non-inferior in terms of safety, but did not reduce prescription of antibiotic regimens in an ED population with fever. In this heterogeneous population, the accuracy of PCT in diagnosing bacterial infections was poor. TRIAL REGISTRATION IN NETHERLANDS TRIAL REGISTER: http://www.trialregister.nl/trialreg/admin/rctview.asp?TC=4949.

Non-targeted HIV screening in emergency departments in the Netherlands.

BACKGROUND: In the Netherlands a substantial proportion of newly diagnosed human immunodeficiency virus (HIV) patients present late for care and an estimated 12-34% of people living with HIV are undiagnosed. Linkage to care of these patients is important to decrease HIV transmission and to improve individual patient outcomes. We investigated if non-targeted HIV testing in emergency departments is a useful and cost-effective way to identify these patients. METHODS: In a cross-sectional multicentre study, eligible adult patients who underwent phlebotomy were given an active choice to be additionally tested for HIV. In a subset of patients, risk factors for HIV infection were asked for. A cost-effectiveness analysis was conducted. RESULTS: Of 7577 eligible patients, 3223 patients were tested, and two new HIV infections were diagnosed (0.06%). Both patients had risk factors for HIV infection. Non-targeted HIV testing in the emergency department was not considered cost-effective, with a cost per quality adjusted life years gained of € 77,050, more than triple the Dutch cost-effectiveness threshold of € 20,000. CONCLUSION: Non-targeted HIV testing in emergency departments in the Netherlands had a low yield of newly diagnosed HIV infections and was not cost-effective. Our data suggest that targeted HIV testing may offer an alternative approach to decrease the number of undiagnosed people living with HIV.

Falsely elevated lactate in severe ethylene glycol intoxication.

A 29-year-old male presented at the emergency department of our hospital in a confused state. He had a history of psychoses and substance abuse. Physical examination revealed hyperventilation and abdominal tenderness. Blood gas analysis in the emergency department using an ABL 725 Radiometer analyser showed a severe metabolic acidosis with massive lactate elevation. Lactate acidosis due to mesenteric ischaemia was suspected. However, toxicology screening demonstrated ethylene glycol intoxication. Treatment with ethanol infusion and acute haemodialysis was started. Repeated laboratory measurements using a clinical chemistry analyser showed minimal plasma lactate elevation. Falsely elevated lactate measurement is a little known phenomenon that can occur in ethylene glycol intoxication and can cause serious delay in diagnosis. Therefore, elevated lactate concentrations measured on intensive care unit and emergency department blood gas analysers should be confirmed by a clinical chemistry analyser in the main laboratory in case of suspected ethylene glycol intoxication.

Preformed antibodies to alpha1,3-galactosyltransferase gene-knockout (GT-KO) pig cells in humans, baboons, and monkeys: implications for xenotransplantation.

OBJECTIVE: The aim of our study was to determine the prevalence and cytotoxicity of primate antibodies directed to antigens other than Galalpha1,3Gal (Gal), termed nonGal antigens. METHODS: Sera from human, baboon, and cynomolgus monkeys were tested by flow cytometry for IgM and IgG binding to both wild-type (WT) and GT-KO pig peripheral mononuclear cells (PBMC). Also, complement-dependent cytotoxicity assays were performed. RESULTS: All species demonstrated significantly higher antibody binding and cytotoxicity to WT cells compared to GT-KO cells (P < .01). Cynomolgus monkeys had significantly higher IgM binding to WT and GT-KO cells than did baboons or humans (P < .01). Furthermore, approximately 50% of both human and baboon sera proved to be lytic to GT-KO cells, compared to 76% of monkey sera (P < .01). CONCLUSIONS: We confirm the advantage of using GT-KO pig grafts over WT pig grafts. However, our results suggest that, compared to the cynomolgus monkey, the baboon may be a more suitable model to study antibody-mediated rejection of GT-KO pig grafts.

Aspirated foreign bodies in children: why are they more commonly found on the left?

The objective was to present our experience in the brochoscopic removal of foreign bodies in children. This was carried out through a retrospective analysis of the medical records of 96 patients in whom endoscopic removal of an inhaled foreign body was required, at the department of paediatric otorhinolaryngology, Eramus Medical Centre, Rotterdam. The participants were all children who underwent bronchoscopy after suspected foreign body aspiration from 1990 to 2000. The main outcome measures were confirmed diagnosis of foreign body aspiration and localization of aspirated foreign body. It was seen that in children up to 3 years of age, there was no significant difference in foreign body distribution and in children aged 3 and older foreign bodies were more commonly found in the right main bronchus. It was concluded that aspirated foreign bodies are equally distributed between the left and right main bronchus in children younger than 3 years. This could be explained by the handling of choking infants by their parents.