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Biomedical subjects

J W Crofton

Publications and source records attributed to J W Crofton.

10 recordsLinked to original sources

Present outlook in bronchiectasis: clinical and social study and review of factors influencing prognosis.

One hundred and sixteen patients with proven bronchiectasis diagnosed at least five years previously were studied to determine the clinical outcome, change in pulmonary function, and degree of social disability. Twenty-two patients had died and the mean duration of follow-up in the survivors was 14 years. The patients who died were characterised by a poorer initial ventilatory capacity than the survivors and cor pulmonale was present in 37% at the time of death. The survivors showed a tendency for improvement in symptoms whether treated surgically or medically. Thirty per cent were better than at diagnosis while only 11% were worse. Measurements of FEV1 and FVC were made at diagnosis and at review, mild airways obstruction being the predominant abnormality. The change in pulmonary function was expressed as the decline in FEV1 in ml/yr. The decline in FEV1 was no greater than expected in 80% of patients and in a further 15% was of the order seen in cigarette smokers with mild airways obstruction. Poor ventilatory capacity was therefore not an important limitation in these patients. Of the survivors 77% had a good work record with less than two weeks loss of work annually from chest illness. The spouses of all married patients were interviewed at home by a trained social worker. Fifty per cent reported no social problem but 46% of spouses found the patient's cough distasteful and 29% of couples had experienced difficulties with normal sexual life. Seven per cent of the patients were severely disabled. While the overall prognosis of our patients was good a minority still have severe physical and social problems as a result of bronchiectasis.

Adolescent

Exacerbations of chronic bronchitis: exogenous or endogenous infection?

Six male patients with chronic bronchitis, who were known previously to have excreted Streptococcus pneumoniae and/or Haemophilus influenzae, both at the times of exacerbations and during remission, were studied for 43 to 52 months. Sputum was examined fortnightly and at the time of exacerbations. Strains of Strep. pneumoniae were serotyped and those of Haemophilus species were typed by antibiograms along with other supporting methods. Sera collected before or at the time of an exacerbation and seven and 30 days afterwards were examined by complement fixation tests against respiratory viruses and Mycoplasma pneumoniae. In 18 out of 25 exacerbations there was evidence of a new type of Strep. pneumoniae and/or Haemophilus spp. or of a current virus infection, suggesting exogenous infection in the majority of these cases. There was a possible reason for failure to detect a new pathogen in three of the seven cases in which none was found. In five further exacerbations adequate investigation was not possible.

Aged

Mediators of immediate-type hypersensitivity in sputum from patients with chronic bronchitis and asthma.

Mediators of immediate-type hypersensitivity were studied in the sputum of patients with chronic bronchitis. The same mediators were also measured in early-onset, skin-test-positive asthmatics, in late-onset, skin-test-negative asthmatics, and in patients with bronchial carcinoma, bronchiectasis, and pneumonia. Sputum eosinophilia was a feature of bronchitics and asthmatics, whereas raised blood eosinophil levels were found only in the early-onset, skin-test-positive asthmatics. Histamine and IgE were present in considerable amounts in the sputum of bronchitics and early-onset, skin-test-positive asthmatics. Smaller amounts were found in the other groups. The sputum in all the groups contained material giving an "S.R.S (slow-reacting substance) like" induced contraction of the guinea pig ileum. "Classical" S.R.S.-A., determined by arylsulphatase IIB susceptibility, was present only in bronchitics and both types of asthmatics. Since the bronchitics were, in general, skin-test negative and had normal concentrations of circulating IgE and eosinophils, it is suggested that the findings in the sputum indicate an element of local immediate-type (type I) hypersensitivity in bronchitis although its significance for pathogenesis is not known.

Adult

Pilot study of factors associated with exacerbations in chronic bronchitis.

The factors associated with exacerbations of chronic bronchitis were investigated in a pilot study of 23 male patients over a period of 29 months. There were 63 exacerbations-56 were fully investigated and in seven only serological studies were possible. Evidence of the presence of an infective agent was sought in the early stages of the exacerbations and during relative quiescence. Significantly more potential pathogens, both bacterial (pneumococci and Haemophilus influenzae) and viral and mycoplasmal, were found during exacerbations than in quiescent periods. It was not possible to demonstrate that atmospheric pollution or low temperature influenced exacerbations, but the data are insufficient to exclude a small effect.It is emphasized that the value of future work on these lines would be increased if agreement could be reached on the definition of an exacerbation.

Adult