E. E. G. in 101 cases suffering from essential hypertension were observed. The results can be classified into four groups according to the E. E. graphic patterns.
Group A; Cases without any pathologic patterns in E. E. G..
Group B ; Cases with slight pathologic patterns in E. E. G..
Group C; Cases characterized with rapid waves; the mean period 84 msec.
Group D; Cases with the appearance of slow waves.
Following results are obtained, that is to say, group A is 36%, group B. 13%, group C. 36%, group D. 15% of all cases examined.
1) In essential hypertension there can not be observed any special E. E. graphic pattern.
2) There exists no clear correlation between E. E. graphic patterns and chief claims, renal function, Ecg., the classification according to K. W., findings of fuudus oculi, B. P. of central retinal artery, arterial B. P..
3) Relationship between circulatory dynamics and E. E. G.; Group A are frequently found in W+E types and M types are often determined in group D.
4) In some cases, the E. E. graphic patterns show the changes of brain more clearly than the other clinical findings do.
5) The appearance of abnormal waves can be examined more closely by means of deep respiration and breathholding test than of merely deep respiration.
6) No special change of E. E. G. is observed in the breathholding test in health.
7) The breathholding test examined in essential hypertension reveals the occurrence of rapid waves “en salve” with large amplitude.
8) In the breathholding, test observed in epilepsy, there occurs spike and wave during hyperpnea, while it disappears during apnea.
9) The breathholding test after medication of priscol. It is apt to turn the slow waves found in essential hypertension into normal pattern or into rapid waves, the same procedure performed in epilepsy shows no changes in E. E. G..
10) Breathholding test after the use of Kallikrein facilitates the appearance of α waves and inhibits the rapid waves.
11) Low % and 100% of O2 were inhaled by the same individual; E. E. G. found in both examinations are similar patterns. Improvement or deterioration of E. E. graphic patterns can not pararell to those of clinical findings. This suggests that E. E. graphic changes must be not only understood medicaly, but also psychologically.
12) Apresoline turnes often the pathologic E. E. G. observed in es sential hypertension into normal pattern; one of important causes is thought to be the increase in the cerebral blood flow. Slow waves can be not frequently recognized immediately before the attack of hypertensive encephalopathy.
13) The degrees of lowering of blood pressure in the patients who are medicated with R. S. is remarkable roughly in proportion to the increase in mean period and in mean amplitude. In addition it may be pointed out that R. S. does not reveal sleep spindle.
14) R. S.-E. E. graphic pattern is quite similar to the pattern in the medication of Deserpidine.
