As combined chemotherapy for pulmonary tuberculosis two-drug therapy employing SM intermittently and PAS daily has been used universally, but recently the effects of this two drug regimen became a subject of discussion.
Especially in comparison with the method of so-called “Japanese combined therapy” administering PAS daily, SM and INH twice a week, on which Prof. T. Kumagai and his coworkers have been advocated, we can confirm clearly superiority of the latter to the former.
Since July 1953 this Japanese combined therapy has been applicated in our hospital to over 1, 000 pulmonary tuberculosis cases and proved the superiority of this method.
Although some authers maintain that large dose of INH daily is more effective as the intermittent administration. This problem must be studied in future.
Among 58 cases of pulmonary tuberculosis treated with chemotherapy, 27 cases were treated with Japanese tripple drug chemotherapy, and SM twice a week and PAS daily were administered to 31 cases. In these cases, we observed change of cavities on roentogenograin, conversion of sputum for tubercle bacilli, and bronchographic findings of drainage bronchi every 6 months following the course.
The difference of two groups are as follows:
1) Cicatrix or cavitary closure occurred in 66.6% of the group which has been treated with tripple drug combined therapy, on the contraly favorable change of cavitary shadows was seen in only 9.8% of the group which has been treated with SM and PAS.
Indeed in 77.5% of this group occurred diminution or condensation of cavities, but cavitary healing with scar formation was not almost seen and these incompletly healed cavities remained so called “target-point” for surgical operation.
2) During the observation 21 cases (77.8%) of 27 cases treated by three drug regimen became negative within 6 months for tubercle bacilli and conversion rate for tubercle bacilli within 9 months was 88.9%.
It is noticeable that conversion rate of the group treated by SM and PAS was, 45.2% within 6 months, 64.6% within 9 months and 29% of this group remained positive during the course.
3) Twenty one cases (91.3%) of 23 cases of the former group showed bronchographically remarkable improvement, (neither expanssive image and strictural blocking nor unstability of the wall of bronchi) and moderate improvement (slight cylinder form enlargement of bronchi, but no strictural blocking or unstability of the wall).
Fourteen cases (66.6%) of these improved cases showed roentgenographically cavitary closure and cavitary healing of scar formation. In the latter group only 9 (32.1%) of 28 cases showed bronchographical improvement and only 2 (22.2%) cavitary closure.
This report, above mentioned, suggests that so-called “Japanese three drug combined therapy” employing SM and INH twice a week and PAS daily is more superior to the SM and PAS combined therapy in clinical effects, conversion of sputum for tubercle bacilli, roentogenographic cavitary closure and bronchographic improvement.
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