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Biomedical subjects

Louis Loutan

Publications and source records attributed to Louis Loutan.

At least 19 recordsLinked to original sources
PubMed2006

Health status of returnees to Kosovo: do living conditions during asylum make a difference?

OBJECTIVE: From August 1999 to July 2001, asylum seekers who had come to Switzerland from Kosovo were repatriated. The present study aimed to assess the relationship between living conditions during asylum in Switzerland and health status among returnees. STUDY DESIGN: Cross-sectional survey of 319 ethnic Albanian families in Kosovo, selected from a list of 12900 heads of households who had received repatriation aid. METHODS: Consenting household members aged 16 years or more who had received asylum in Switzerland were interviewed during the autumn of 2001. Questions explored living conditions during asylum, present socio-economic conditions (World Bank Kosovo Poverty Assessment Survey), subjective physical and mental health [Medical Outcomes Study 36-item Short Form Health Survey (SF-36)], traumatic events (Harvard Trauma Questionnaire) and symptoms of post-traumatic stress disorder (PTSD; Mini International Neuropsychiatric Interview). RESULTS: Ninety-four per cent of selected households were located. Among the 580 participants, 25.5% suffered from PTSD and 65% lived in extreme poverty. Subjective health scores, measured by SF-36, were low, particularly for those affected by PTSD. Among living conditions in the host country, duration of stay longer than 26 weeks was associated with lower mental health scores, particularly among people with PTSD. CONCLUSIONS: Two years after the conflict, returnees had low health scores. The association between duration of stay and lower mental health scores may reflect the stress of adapting to asylum or the consequence of compulsory repatriation. This study has implications for the emerging healthcare system in Kosovo and for policies of asylum in host countries.

Adolescent↗
PubMed2006

Clinical presentation and treatment outcome of sleeping sickness in Sudanese pre-school children.

BACKGROUND: Existing data on human African trypanosomiasis (HAT) due to Trypanosoma brucei gambiense among children are limited. Here, we described the demographic, clinical, diagnostic, treatment and outcome characteristics of HAT in pre-school children from Kajo-Keji County, South Sudan in comparison with older patients. METHODS: We did a retrospective analysis of HAT patients treated at the Kiri Sleeping Sickness Treatment Centre (SSTC), Kajo-Keji County, from June 2000 to December 2002. RESULTS: Of 1958 HAT patients, 119 (6.1%) were pre-school children (<6 years) including 56 (47%) in first-stage illness and 63 (53%) in second-stage. The proportion of children in second-stage HAT was significantly higher in very young children (<2 years). Walking and speech disturbances were more frequent in second-stage HAT but other neurological symptoms and signs were not associated with disease stage. Pentamidine treatment for first-stage illness was very safe and effective among pre-school children. In contrast, 4.9% of pre-school children in second-stage illness died during melarsoprol treatment and 46% had > or = 1 severe adverse event(s). Macular rash, jaundice and skin necrosis on injection site were significantly more frequent in this age group (p<0.05). Melarsoprol-induced encephalopatic syndrome was less frequent but more severe than in older age groups. CONCLUSION: The clinical features of T. b. gambiense HAT among pre-school children are insufficiently stage-specific. Therefore, laboratory-based staging is mandatory to prevent unnecessary harm to HAT patients caused by the high toxicity of melarsoprol.

Adolescent↗
PubMed2006

Malaria treatment failures after artemisinin-based therapy in three expatriates: could improved manufacturer information help to decrease the risk of treatment failure?

BACKGROUND: Artemisinin-containing therapies are highly effective against Plasmodium falciparum malaria. Insufficient numbers of tablets and inadequate package inserts result in sub-optimal dosing and possible treatment failure. This study reports the case of three, non-immune, expatriate workers with P. falciparum acquired in Africa, who failed to respond to artemisinin-based therapy. Sub-therapeutic dosing in accordance with the manufacturers' recommendations was the probable cause. METHOD: Manufacturers information and drug content included in twenty-five artemisinin-containing specialities were reviewed. RESULTS: A substantial number of manufacturers do not follow current WHO recommendations regarding treatment duration and doses. CONCLUSION: This study shows that drug packaging and their inserts should be improved.

Adult↗
PubMed2006

Posttraumatic stress disorder and the use of general health services in postwar Kosovo.

Studies conducted in high-income countries have demonstrated that posttraumatic stress symptoms are positively correlated with increased use of general health services; however, comparative data are lacking in postwar settings. This survey was conducted in Kosovo after the end of the conflict; 996 people, age 16 or older, were interviewed. Older age, lower education level, worse physical health, and current diagnosis of posttraumatic stress disorder (PTSD) were associated with higher use of any health services. After adjusting for gender, age, place of residence, type of education, poverty, refugee status, and subjective physical health, PTSD remained associated with an increased use of most health care services. Our results underline the importance of taking into account PTSD when restoring health services in postwar countries.

Adolescent↗
PubMed2006

Field validity, reproducibility and feasibility of diagnostic tests for visceral leishmaniasis in rural Nepal.

OBJECTIVES: To assess the field accuracy, reproducibility and feasibility of the formol gel test (FGT), the urine latex agglutination test (KAtex) and a rK39 antigen-based dipstick for the diagnosis of visceral leishmaniasis (VL) in rural Nepal. METHOD: Patients with clinical suspicion of VL were recruited at Rangeli District Hospital (DH), a 15-bed government hospital located in south-eastern Nepal. FGT, KAtex and rK39 dipstick tests were performed on site and later repeated at a reference kala-azar diagnostic laboratory to assess reproducibility. Diagnosis of VL was confirmed by either a positive bone marrow aspirate examination or a positive direct agglutination test (DAT titre > or = 1:3200) in patients who later responded to anti-leishmanial therapy. RESULTS: Of 155 patients initially recruited, 142 (85 with VL and 57 with another diagnosis) were included in the study. The sensitivity of the rK39 dipstick [89%; 95% confidence interval (CI): 81-94] was significantly higher than that of the KAtex (57%; 95% CI: 46-67) and the FGT (52%; 95% CI: 41-62). All three tests had a specificity of at least 90%. Agreement was higher for the rK39 dipstick (kappa = 0.87) than for the FGT (0.68) and the KAtex (0.43). All tests required < or = 20 min of actual work and < or = 40 min to obtain the results. CONCLUSION: The rK39 dipstick was easy to do, more accurate and reproducible than other rapid diagnostic tests for VL in a DH of rural Nepal. It should be integrated into the field diagnostic algorithm of VL in this region and mechanisms to secure its availability should be found.

Adult↗
PubMed2005

Hepatitis A vaccines and the elderly.

Hepatitis A virus (HAV) exposure in unprotected adults may cause severe and serious symptoms, with risk of both morbidity and mortality increasing with age. As seroprevalence of HAV is low in industrialised countries, and an increasing number of people, with an increasing median age, travel from areas of low HAV endemicity to high endemicity, pre-travel vaccination is warranted. Vaccination of the elderly against HAV, however, may be associated with reduced seroprotection, since the immune response decreases with age. Studies with monovalent hepatitis A vaccine or combined hepatitis A and B vaccine show good efficacy in adults in general. Few studies have assessed the immune response in older adults. The only prospective study with monovalent hepatitis A vaccine in the elderly showed a reduced seroprotection of approximately 65% after a single primary dose in subjects over the age of 50 years, while seroprotection was 98% in this age group after receiving a booster dose. The only prospective study with combined hepatitis A and B vaccine in younger subjects or older than 40 years showed similar seroprotection (99-100%) against HAV compared to a monovalent vaccine after receiving three doses. As data on seroprotection for HAV in the elderly are limited, further studies are needed to elucidate how optimal protection in the elderly can be achieved. In the mean time, based on the available data, the suggestion is made to screen elderly travellers to areas endemic for HAV for the presence of naturally acquired immunity, and, if found susceptible, be immunised well in advance of their trip, to allow time for post-vaccination antibody testing and/or administration of a second dose of the vaccine.

Age Factors↗
PubMed2005

Interchangeability and tolerability of a virosomal and an aluminum-adsorbed hepatitis A vaccine.

The interchangeability of virosomal (Epaxal) and aluminum-adsorbed (Havrix 1440) hepatitis A virus (HAV) vaccines was studied in 111 healthy adults who were vaccinated in a randomized, single-blind, crossover clinical trial. Anti-HAV antibody titers were measured at days 0 (first dose), 14, and 28, and months 3, 6, 12 (second dose), 13, 24, 36, 48, 60 and 72. Most subjects (>95%) had sero-converted 14 days after the first dose of either vaccine. The second dose with either vaccine induced a high antibody response in all vaccines, irrespective of the type of vaccine administered as the first dose. Although both vaccines were well tolerated, the incidence of local adverse events (in particular pain) was significantly lower in subjects receiving the virosomal vaccine. Six-year follow-up data did not reveal any significant differences between the vaccination groups.

Adjuvants, Immunologic↗
PubMed2005

Options for field diagnosis of human african trypanosomiasis.

Human African trypanosomiasis (HAT) due to Trypanosoma brucei gambiense or T. b. rhodesiense remains highly prevalent in several rural areas of sub-Saharan Africa and is lethal if left untreated. Therefore, accurate tools are absolutely required for field diagnosis. For T. b. gambiense HAT, highly sensitive tests are available for serological screening but the sensitivity of parasitological confirmatory tests remains insufficient and needs to be improved. Screening for T. b. rhodesiense infection still relies on clinical features in the absence of serological tests available for field use. Ongoing research is opening perspectives for a new generation of field diagnostics. Also essential for both forms of HAT is accurate determination of the disease stage because of the high toxicity of melarsoprol, the drug most widely used during the neurological stage of the illness. Recent studies have confirmed the high accuracy of raised immunoglobulin M levels in the cerebrospinal fluid for the staging of T. b. gambiense HAT, and a promising simple assay (LATEX/IgM) is being tested in the field. Apart from the urgent need for better tools for the field diagnosis of this neglected disease, improved access to diagnosis and treatment for the population at risk remains the greatest challenge for the coming years.

Animals↗
PubMed2005

Diagnostic accuracy of two rK39 antigen-based dipsticks and the formol gel test for rapid diagnosis of visceral leishmaniasis in northeastern Uganda.

The development of an accurate, practical, and affordable diagnostic test is essential to improve the management of visceral leishmaniasis (VL) in remote health centers. We evaluated the Formol Gel test (FGT) and two rK39 antigen-based dipsticks, the DUAL-IT L/M, and the Kalazar Detect for VL diagnosis in Amudat Hospital in Uganda. The DUAL-IT L/M was also evaluated for the diagnosis of malaria. All patients clinically suspect of VL were prospectively included in the study between October 2003 and March 2004. The gold standard used to define a VL case was a positive spleen aspirate or a direct agglutination test titer of >1:12,800 with an appropriate clinical response to antileishmanial therapy. A total of 131 VL and 112 non-VL patients were included in the analysis. The DUAL IT L/M was found to be more sensitive than the Kalazar Detect: 97% (95% confidence interval [95%CI] = 92 to 99%) versus 82% (95%CI = 74 to 87%). The Kalazar Detect and the DUAL IT L/M were highly specific (99% [95%CI = 95 to 100%] and 97% [95%CI = 92 to 99%], respectively). The FGT lacked both sensitivity (66% [95%CI = 57 to 73%]) and specificity (90% [95%CI = 83 to 94%]). The sensitivity of the DUAL IT L/M for malaria was only 57% (95%CI = 37 to 76%). The two rK39 dipsticks can be used for diagnostic confirmation of VL in this region. The DUAL-IT L/M without its malaria diagnostic component (DiaMed-IT LEISH) will be adopted as first-line test for VL in Uganda.

Adolescent↗
PubMed2005

Vaccine-preventable diseases in long-term expatriates.

The term "expatriates" refers to professionals and their families who live abroad for several months or years. Owing to potential prolonged exposure, and living conditions that may be closer to those of the local population, they are at higher risk of acquiring infectious diseases that are endemic in their new place of residence. They often have reduced access to medical services, putting them at higher risk of complications and more severe outcomes. Vaccination is probably one of the most effective means of preventing expatriates from acquiring endemic or epidemic diseases. Incapacitation or sickness in the field may cause serious disruption to project activities and impose an extra workload on the local team. It may also result in repatriation, with further extra direct and indirect costs for the organization. Predeparture advice and preparation, to promote risk reduction behavior, coupled with adequate support in the field are key ingredients to ensure effective and successful activities of collaborators. Institutions and organizations sending expatriates to developing countries have a clear responsibility, and it is in their own interests to promote the health of their employees working abroad.

Adult↗
PubMed2004

Awareness, prevalence, medication use, and risk factors of acute mountain sickness in tourists trekking around the Annapurnas in Nepal: a 12-year follow-up.

Acute altitude exposure may lead to acute mountain sickness (AMS). Increased awareness of altitude-related health hazards in trekkers may accompany a decrease in AMS prevalence. We compared awareness and AMS prevalence in trekkers in two cohorts on an altitude trek up to 5400 m and assessed risk factors for AMS by repeating an observational cohort study 12 yr after an initial study. Questionnaires in English were distributed to two cohorts of 500 trekkers in 1986 and 1998. All trekkers over a several day period were asked to participate. Average participation rate was 62% (71% in 1986 and 53% in 1998). We found an increase in AMS awareness in trekkers from 80% to 95%, a decrease in AMS prevalence from 43% to 29%, and significant slower climbing profiles. We found no relationship between AMS and smoking habits, body mass index, oral contraception intake, or training status. By contrast, age was a strong independent risk factor inversely related to AMS. Subjects over 55 yr were 2.6 times less likely to suffer from AMS than subjects under 25 yr. Self-medication, including acetazolamide and analgesics, had increased importantly from 17% to 56%, and contraception intake in women had increased from 19% to 32%. In conclusion, in 1998 as compared to 1986, trekkers were older, climbed more slowly, had better awareness of altitude illness, used more medication, and suffered less from AMS.

Acclimatization↗
PubMed2004

Determinants of postconflict symptoms in Albanian Kosovars.

During the period from 1998 to 1999, more than 1 million civilians from the province of Kosovo in the Balkans were displaced as a consequence of organized violence and war. The aim of the present study was to determine the prevalence of posttraumatic stress disorder (PTSD) in a sample of the Albanian Kosovar population more than 2 years after the end of the conflict and to assess the effect of exposure to war-related events. A total of 340 households were randomly selected among 12,900 families returned from a country of asylum (Switzerland). All adults in each household were invited to participate (N = 996). The following instruments were used: the Albanian translations of the PTSD section of the Mini International Neuropsychiatric Interview and of the Medical Outcomes Study 36-Item Short Form, and a list of traumatic events adapted from the Harvard Trauma Questionnaire. The overall prevalence of PTSD was 23.5%. A strong cumulative effect of trauma was observed, with odds ratios for PTSD rising steeply with the number of events to which people were exposed. After taking into account traumatic events, multivariable analysis indicated that female gender, older age, and having left Kosovo during the conflict were significantly associated with higher frequency of PTSD, whereas significant heterogeneity among municipalities was observed. Stratified analysis for people who stayed and left the province during the war suggested that different patterns of trauma may be relevant in the two subsamples, with forced separation and isolation strongly associated with PTSD in people who stayed in Kosovo. PTSD diagnosis was also significantly associated with lower scores on all dimensions of the Medical Outcomes Study 36-Item Short Form and lower economic status. The results suggest that responding to medium-term and long-term mental health consequences of conflict is a necessary task for the global rehabilitation of health care systems in a war devastated country.

Adolescent↗
PubMed2004

Impact of snake bites and determinants of fatal outcomes in southeastern Nepal.

Current available data on snake bites in Nepal are based solely on hospital statistics. This community-based study aimed at evaluating the impact of snake bites and determining the risk factors associated with a fatal outcome in southeastern Nepal. A total of 1,817 households, selected by a random proportionate sampling method, were visited by trained field workers in five villages. Extensive data from snake bite victims during the 14 previous months were recorded and analyzed. One hundred forty-three snake bites including 75 bites with signs of envenoming were reported (annual incidence = 1,162/100,000 and 604/100,000, respectively), resulting in 20 deaths (annual mortality rate = 162/100,000). Characteristics of krait bites such as bites occurring inside the house, while resting, and between midnight and 6:00 am were all factors associated with an increased risk of death, as were an initial consultation with a traditional healer, a long delay before transport, and a lack of available transport. An initial transfer to a specialized treatment center and transport by motorcycle were strong protective factors. Among the 123 survivors, wounds required dressing and surgery in 30 (24%) and 10 (8%) victims, respectively, the mean working incapacity period was 15 days, and the mean out-of-pocket expense was 69 U.S. dollars. Snake bite is a major but neglected public health problem in southeastern Nepal. Public health interventions should focus on improving victims' rapid access to anti-snake venom serum by promoting immediate and fast transport to adequate treatment centers, particularly for bites occurring at night.

Adult↗
PubMed2003

Language barriers between nurses and asylum seekers: their impact on symptom reporting and referral.

The objective of this study was to determine whether language barriers during the screening interview affected the reporting of asylum seekers' health problems and their referral to further health care. Seven hundred and twenty-three standard screening questionnaires, administered by nurses to asylum-seekers at the time of entry into Geneva/Switzerland between June and December 1998, were reviewed, as well as information pertaining to language use during the interview. Language concordance between nurses and asylum seekers was assessed by considering the presence/absence of an interpreter, the type of interpreter present (trained, untrained), and the nurse's self-assessed proficiency in the language used during the medical interview. Nurses also recorded their own subjective assessment of the overall quality of communication during the interview. More than half of the asylum seekers came from Europe, mainly the Balkan regions, and a third of them from Africa. Most asylum seekers were men (72%). The median age was 26.5 years, and 50% were younger than 25 years. Severe physical and psychological symptoms were reported by 19% and traumatic events prior to migration were reported by 63%. The nurses referred 36% of all refugees to further medical care and 6% to psychological care. Professional interpreters were used in 8% of the interviews and ad hoc interpreters in 16%. Adequate, partial and inadequate language concordance was reported for 54%, 27% and 18% of the consultations respectively. Adequate language concordance was significantly associated with higher reporting of past experience of traumatic events and of severe psychological symptoms, contrasting with much fewer referrals to psychological care when language concordance was inadequate. These results suggest the importance of addressing language barriers in primary care centres in order to adequately detect and refer traumatised refugees. To address this problem, the use of professional interpreters is recommended.

Adult↗