Abstract
1. Atropine has recently been known to possess a sympathetic ganglion blocking effect. If atropine blocks the sympathetic ganglia innervating the blood vessels, the drug should cause depressor responses. The author attempted to verify this assumption in urethane-anesthetized rabbits having atropinesterase. 2. Ten and $50{\mu}g/kg$ of atropine produced little variation of the blood pressure; $250{\mu}g/kg$ slight depressor responses; $1,250{\mu}g/kg$ distinct ones. Under hexamethonium-infusion, 10 and $50{\mu}g/kg$ produced observable depressor responses; 250 and $1,250{\mu}g/kg$ produced more pronounced ones. 3. In experiments examining influence of phenoxybenzamine and bretylium on the atropine responses, the lowered blood pressure by these agents was raised by simultaneous infusion of angiotensin with hexamethonium. The depressor responses to atropine (10, 50 and $250{\mu}g/kg$) were slight after the administration of phenoxybenzamine and bretylium. 4. Propranolol did not affect the depressor responses to atropine. 5. In spinalized rabbits the lowered blood pressure was raised by the angiotensin-infusion. In these animals receiving the simultaneous hexamethonium-infusion, atropine (10, 50 and $250{\mu}g/kg$) produced little depressor responses. 6. From these results it is inferred that atropine produced the depressor responses by blocking the sympathetic ganglia innervating the blood vessels.
Atropinesterase를 가친 가토(家兎)를 선택(選擇)하여 urethane 마취하(麻醉下)에서 atropine에 대한 혈압반응(血壓反應)을 조사(調査)하여 다음과 같은 성적(成績)을 얻었다. 1) 10, $50{\mu}g/kg$의 atropine은 거의 혈압하강(血壓下降)을 일으키지 않았으나, $250{\mu}g/kg$는 미약(微弱)한 혈압하강(血壓下降)을, $1,250{\mu}g/kg$는 현저(顯著)한 혈압하강(血壓下降)을 일으켰다. 2) Hexamethonium 주입하(注入下) 10, $50{\mu}g/kg$의 atropine도 혈압하강(血壓下降)을 일으키고, $^-250$, $1,250{\mu}g/kg$에 대한 하강반응(下降反應)은 더욱 현저(顯著)하였다. 3) Hexamethonium 또는 hexamethonium+angio-tensin주입하(注入下)에서 나타나는 atropine (10, 50, $250{\mu}g/kg$)에 대한 혈압하강(血壓下降) 반응(反應)은 propaneline, phonoxybenzamine, bretylium 존재하(存在下)에서는 현저(顯著)하게 억제(抑制)되었다. 4) 척수이단(脊髓離斷) 가토(家兎)에서는 hexamethonium+angiotensin주입하(注入下)에서도 atropine (10, 50, $250{\mu}g/kg$)은 거의 혈압하강(血壓下降)을 일으키지 않았다. 상기(上記) 성적(成績)에 의거(依據)하여 atropine은 혈관계(血管系)에 분포(分布)되여 있는 교감신경계(交感神經系)의 신경절(神經節)에 있어서의 충격부달(衝擊傅達)을 억제(抑制)함으로써 혈압하강(血壓下降)을 일으키는 것으로 추측(推測)하였다.