Antibody responses to deamidated gliadin peptide show high specificity and parallel antibodies to tissue transglutaminase in developing coeliac disease.

Coeliac disease (CD) is an enteropathy induced in genetically susceptible individuals by gluten components, gliadin, hordein and secalin, polypeptides present in cereals such as wheat, barley and rye, respectively. Although the disease starts as intolerance to gliadins, antibodies to tissue transglutaminase (tTG) in the gut epithelium are characteristic of the disease. Whereas serum autoantibodies against tTG (tTGA) are highly specific for CD, antibodies to gliadin are less informative as they can also be detected in other enteropathies, and even in healthy individuals. However, it was shown recently that antibodies to certain gliadin peptides occur with high specificity in CD patient sera. We developed a solid phase lanthanide-based immunofluorometric assay for simultaneous detection of serum IgA and IgG antibodies to a synthetic peptide derived from gamma gliadin of wheat comprising amino acids 86-103. Three glutamine residues of this native 18-mer peptide were replaced by glutamic acids and the peptide was biotinylated. Sera from 87 individuals who had undergone duodenal biopsy and were diagnosed with CD and from 81 healthy individuals were analysed for the presence of both IgA and IgG anti-gliadin peptide antibodies. The performance of the peptide AGA assay was excellent, showing a specificity and sensitivity of 90% and 92% for IgA, and 98% and 75% for IgG, respectively. The corresponding values for conventional anti-gliadin antibody (AGA) enzyme-linked immunosorbent assay (ELISA) tests were 72% specificity and 87% sensitivity for IgA, and 64% specificity and 78% sensitivity for IgG. In a prospective study, almost all the tTGA-positive sera drawn from children who later developed CD were also positive for gliadin peptide antibodies.

Quantitative assessment of faecal bifidobacterial populations by real-time PCR using lanthanide probes.

AIM: To develop real-time quantitative PCR methods, based on the use of probes labelled with a stable fluorescent lanthanide chelate, for the quantification of different human faecal bifidobacterial populations. METHODS AND RESULTS: The designed quantitative PCR assays were found to be specific for the corresponding Bifidobacterium species or groups (Bifidobacterium longum group, Bifidobacterium catenulatum group, Bifidobacterium adolescentis, Bifidobacterium breve, Bifidobacterium angulatum, Bifidobacterium bifidum and Bifidobacterium dentium). The detection limits of the methodologies used ranged between 2 x 10(5) and 9 x 10(3) cells g(-1) of faeces. The applicability of the developed assays was tested by analysing 20 human faecal samples. Bif. longum group was found to be the qualitatively and quantitatively predominant bifidobacterial group. CONCLUSIONS: The real-time PCR procedures developed here are specific, accurate, rapid and easy methods for the quantification of Bifidobacterium groups or species in human faecal samples. SIGNIFICANCE AND IMPACT OF THE STUDY: The developed procedures will facilitate rapid and objective counting of large numbers of samples increasing our knowledge on the role of gut bifidobacterial microbiota in health and disease. This will contribute to the efficient use of intestinal bacterial assays in research, food and pharmaceutical development as well as in the assessment of dietary management of diseases.

Factors related to non-compliance with antihypertensive drug therapy.

The objectives were to study the associations of perceived health care-related and patient-related factors with self-reported noncompliance with antihypertensive treatment. General practitioners identified all of their hypertensive patients in 26 health centres during 1 week in 1996 (n = 2219). A total of 1782 (80%) patients participated in the study, of whom 1561 were on antihypertensive medication. Based on 82 opinion statements in two questionnaires, 14 problem indices were formed by using factor analysis. Out of these, summary variables concerning problems related to the health care system and the patients were formed. Logistic regression models, including interaction analyses, were used to study the associations with non-compliance. The results were that the majority of patients had at least one perceived health care system-related (88%) and patient-related problem (92%). A high number of both perceived health care system-related problems (adjusted OR 4.77; 95% CI 2.76, 8.26) and patient-related problems (adjusted OR 3.23; 95% CI 1.79, 5.81) were associated with self-reported non-compliance. The experience of adverse drug effects was also associated with non-compliance (adjusted OR 1.41; 95% CI 1.03, 1.94). In conclusion self-reported non-compliance was associated with multiple risks of both perceived health care system-related and patient-related problems.

Patients' perceived problems with hypertension and attitudes towards medical treatment.

OBJECTIVE: To study perceived problems and attitudes in hypertension treatment in primary health care. STUDY POPULATION AND METHODS: A cross-sectional survey of 2219 hypertensive patients, identified by general practitioners, in 26 health centres was carried out during 1 week in 1996. A total of 1782 patients (80%) returned two questionnaires and participated in a health examination. The final study population consisted of 1561 patients currently being medically treated for hypertension and 220 patients not currently on medical treatment. The questionnaires contained 82 questions on different aspects of hypertension care and treatment, which were further elaborated using factor analysis. On the basis of reliability and internal validity analyses, 14 problem indices related to medical treatment of hypertension were formed. RESULTS: The most common perceived problem was related to lack of motivation for follow-up of hypertension (72%). Many patients had difficulties to accept being hypertensive (66%). A careless attitude towards hypertension was also common (63%). Lack of information was experienced by 56% of the patients. About 33% felt hopeless about their hypertension, reported adverse effects of hypertension treatment on sexual functions and lack of support by health care personnel. The least frequent problems were reimbursement problems and modification of dosage instructions. The number of problems identified per person varied between zero and 14 with a mean of 4.9 +/- 2.6 (s.d.). CONCLUSION: Perceived problems concerning hypertension, negative attitudes and experiences are very common among hypertensive patients in primary health care.

Patient-perceived problems, compliance, and the outcome of hypertension treatment.

OBJECTIVE: To study the associations between the outcome of antihypertensive therapy with both patient-perceived problems and patient initiated modification of dosage instructions. DESIGN AND METHODS: In this cross-sectional survey, all chronic hypertensives aged less than 75 years (n = 971) visiting nine Finnish pharmacies between May and September of 1996 were asked to participate. Of the 866 agreeing to participate, 482 returned the questionnaire (56%). After excluding persons with missing data, the final study population consisted of 428 hypertensive patients. Information on problems with treatment, the modification of dosage instructions, and blood pressure levels was based on patient self-reports. RESULTS: Two-thirds (68%) of the study population reported suffering from one or more problems. The most common problems were symptoms of high blood pressure and adverse drug effects. Thirty-one percent of the male respondents and 21% of the female respondents reported having modified their dosage instructions. Only 36% of the patients had reached the goal blood pressure (< 160/90 mmHg). Patients having problems with hypertension treatment were significantly more likely to have modified their dosage instructions than those without problems (3+ problems, adjusted OR = 4.8). Not reaching goal blood pressure levels was significantly associated with both high number of patient-perceived problems (3+ problems, adjusted OR = 2.1) and modification of dosage instructions (adjusted OR = 1.9). CONCLUSION: The poor outcome in antihypertensive therapy is associated with both patient-perceived problems and patient initiated modification of dosage instructions.