The author et al. have made studies on 259 subjects of hypertension who ranged in age from 15 to 35 years. Consequently, the cases that their factors could be concluded, were defined as the secondary hypertension and the one that did not, was as the primary hypertension. The former showed 19.3 % and the latter was 80.7 %.
1) In secondary hypertension, 70% of which was renal impediment, that were nephritis, cystic kidney, pyelonephritis, hydronephrosis, nephrolithiasis, movable kidney and etc. The rest of them were 5 cases of the primary aldosteronismus, 1 case of hypertrophia of medulla of supra renal gland, 3 cases of disorder of blood vessel and the other five cases.
2) Results of the investigations upon the primary hypertension.
a. Significance was found in 47.6 % which had hereditary factor.
b. 11.3% showed fatness in their physiques and can not be ignored as one of the cause of hypertension.
c. Renal biopsy was carried out on the cases in which microscopic urine albumin was marked, though being normal in renal function without history of nephritis. There were considerable changes in blood vessels, stroma of renal tubles and Bowman's capsule. It would be necessary to protect kidney because of some changes were noted in renal biopsy, regardless of an existence of albuminuria.
d. 41.3% showed some changes in E.K.G., especially of liability upon left heart, for which protection of kidney required in some cases.
e. Only 3.7% showed over 250 mg% of serum cholesterol level.
f. 2 cases out of 50 cases showed high level of quantitative urine vanil mandelic acid, but became normal after repeated test. In this case, tumor of medulla of supra renal gland could be ruled out and psychogenic factor was strongly suggested.
g. The eye ground changes belonged up to the KW II group, was marked in a few cases.
h. In the angiotensin intracutaneous test, many showed hypersensitiveness which was differed from the other type of hypertension and the control, but they were not related with the medum of blood pressure and successive time of induration.
i. In plethysmoangiogram, a group of juvenile hypertension presented a different phase from that of the middle and old ages.
j. A half of the total cases showed descent of blood pressure without having antihypertensive drugs, and this tendency was observed more apparently in the young than in the did ages.
k. In order to investigate the psychogenic factor psychological tests, using Cornel Medical Index (C.M.I.), Yatabe-Guilford Personality Inventory (Y.G.) and Seikenshiki Personality Inventory (I.N.V.), were carried out. As the results, C.M.I. disclosed neurotic tendency and I.N.V. showed nervousness but no peculiar tendency was observed in Y.G. Thus, psychogenic factors can not be denied as one of the factors of the primary hypertension.
In the secondary hypertension, there are some cases which could be treated surgically, but as to the primary hypertension, of which factors could not be found, we realize the necessities to make efforts in order to pursuate their factors, and at the same time to discover them at early period for their treatment.
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