A change from high-flow to titrated oxygen therapy in the prehospital setting is associated with lower mortality in COPD patients with acute exacerbations: an observational cohort study.

BACKGROUND: The aim of this study was to investigate 30-day mortality for COPD patients treated by ambulances in the period before and after implementation of a pre-hospital oxygen protocol. METHODS: Prehospital High-flow oxygen was used from April to September 2012 and titrated oxygen from April to September 2013. Primary outcome was 30-day mortality. RESULTS: 707 patients were included; 209 in the high-flow group and 498 in the titration group. Of these, 56 and 132 arrived with acute exacerbation (AE). Overall 30-day mortality was 11.5% vs. 9.4% (p=0.41), respectively. For patients with AE, it was 19.6% vs. 4.6% (p=0.001). CONCLUSION: Change of treatment protocol is associated with a lower 30-day mortality for patients registered with acute exacerbation, but not for all COPD patients.

Patients' perspectives on point-of-care diagnostics and treatment by emergency medical technicians in acute COPD exacerbations: A qualitative study.

BACKGROUND: In Denmark emergency medical technicians transport patients with acute COPD exacerbations to the nearest emergency department. From a clinical and economic perspective, this transport and assessment at the hospital may be inconvenient if the patient is immediately discharged from the emergency department. We established an emergency technical technicians point-of-care diagnostics and treatment program of patients with COPD with use of ultrasound and blood analysis. Patients' perspectives on treatment at home and sense of security are important to qualify clinical practice at home with patients with acute exacerbation. AIM AND OBJECTIVES: To explore patient's and relatives' experience of treatment at home during emergency calls due to COPD in exacerbation and to investigate their attitude to avoid hospitalization as well as experience of stress during point-of-care diagnostics in their own home. METHOD: A qualitative study comprising semi-structured interviews with 16 patients carried out from April 1st, 2019 to March 31st, 2020 in Denmark. Data was analysed inspired by Malteruds' text condensation and informed by Critical Psychology with first person perspective focusing on the patient's views on point-of-care diagnostics and treatment of their COPD in acute exacerbation. RESULTS: The interviews revealed that in order to ensure an experience of quality in the assessment and treatment of patients in their own homes, it was important that the ambulance staff showed great safety and experience in the use of the technical equipment and treatment of dyspnea. It was also of importance that the patients felt confident that their general practitioner followed up on the home treatment initiated. CONCLUSION: Patients' perspectives showed that point-of-care diagnostics and treatment of acute COPD in exacerbation was considered a qualitative offer by the patients and their relatives. At the same time, it was crucial that the emergency medical technicians showed experience and safety in handling shortness of breath as well as the technical equipment. TRIAL REGISTRATION: Approved by the Danish Data Protection Agency Project-ID: 20/24845.

Pilot scale purification of human monoclonal IgM (COU-1) for clinical trials.

No standard procedure is available for the purification of human monoclonal antibodies for human i.v. administration. Here we describe the procedure developed for pilot scale purification of the human IgM monoclonal antibody COU-1 directed against a cancer-associated antigen. The hybridoma cells were grown in protein-free medium and purification from the clarified culture supernatant was carried out in 4 simple chromatographic steps: (1) hydroxylapatite chromatography; (2) hydrophobic interaction chromatography on phenyl-Sepharose: (3) cation-exchange chromatography on sulphonyl-Sepharose; and (4) anion-exchange chromatography on tetraethylamino-Sepharose. The product was substantially pure with regard to protein after step 3, but contained DNA which was removed in step 4. The average recovery of the IgM was 54% with a range of 40-65%. Importantly, the ability of the antibody to bind to its antigen in ELISA was fully maintained during the purification. Subsequently, the purified antibody was isotope labelled and successfully used for in vivo detection of colon, rectal and pancreas carcinomas in patients. The purification procedure described appears to compare favourably with previously published methods, but a critical comparison is not possible due to the lack of necessary information in the available literature.

Hepatitis B core antibodies in Danish blood donors: a surrogate marker of risk behaviour.

BACKGROUND AND OBJECTIVES: The aim of this work was to determine the prevalence of antibodies to hepatitis B core antigen (anti-HBc) among Danish blood donors and to correlate this with risk factors for blood-borne and sexually transmitted diseases. MATERIALS AND METHODS: During a 5-month period, 10 862 consecutive donors in the County of Funen were screened for anti-HBc, and repeat-reactive samples were confirmed by supplementary testing. Information on risk factors was assessed by questionnaire in 585 consecutive anti-HBc-negative blood donors and compared with information obtained from confirmed positive donors. RESULTS: The prevalence of confirmed positive anti-HBc among donors was 0.70% (76/10 862, 95% confidence interval [CI]: 0.55-0.87). One donor was positive for anti-HBc immunoglobulin M (IgM); none tested positive for hepatitis B virus (HBV) DNA. In a logistic regression analysis, age, female gender, tattoos and commercial sexual relations, were independent predictive factors for the presence of anti-HBc. CONCLUSION: Anti-HBc is a surrogate marker for previous risk behaviour in the Danish blood donor population. We suggest that screening for anti-HBc may be used among new donors to supplement interviews on risk behaviour.

Leukocyte-depletion of blood components does not significantly reduce the risk of infectious complications. Results of a double-blinded, randomized study.

Allogeneic blood transfusions are claimed to be an independent risk factor for postoperative infections in open colorectal surgery due to immunomodulation. Leukocyte-depletion of erythrocyte suspensions has been shown in some open randomized studies to reduce the rate of postoperative infection to levels observed in nontransfused patients. Using a double-blinded, randomized design, we studied the postoperative infection rate in patients undergoing open colorectal surgery transfused with either leukocyte-depleted erythrocyte suspensions (LD-SAGM) or non-leukocyte-depleted erythrocyte suspensions (SAGM). Unselected patients (n 279) were allocated to receive LD-SAGM (n 139) or SAGM (n 140) if transfusion was indicated. Forty-five percent were transfused, yielding 48 patients in the LD-SAGM group and 64 in the SAGM group. Thirteen patients were excluded because they received one type of transfusion in spite of randomization to the other type. No significant differences in the rates of postoperative infections (P=0.5250) or postoperative complications (P=0.1779) were seen between the two transfused groups. Infection rates were 45% and 38% in the transfused groups and 21% and 23% in the nontransfused groups. No significant difference between the transfused groups was seen on any single infectious event, mortality rate, or duration of hospitalization. Leukocyte-depletion of erythrocyte suspensions transfused to patients undergoing open colorectal surgery does not reduce postoperative infection rates.