Өвчтөний даралт огцом унаж шокод орсон үед судас агшаах үйлдэлтэй эмийг хичнээн хэрэглээд ч үр дүнд хүрэхгүй байх үед бид өөрсдийн хүчгүйгээ мэдрэх явдал тохиолддог билээ. Тэр үед хүний амийг аврах өөр ямар нэг аргыг олж, хэрэгжүүлж чадах боломж байдаг. Энэ бүхний үндэс нь тухайн эмгэгийнхээ цаад учир шалтгаан, механизмын талаарх логик бүхий бүрэн мэдлэг билээ. Иймээс өнөөдөр эмнэлгийн практикт нийтлэг тохиолддог цусны эргэлтийн дутагдлаас үүсэх шокын талаар бичихийг оролдлоо.
Цусны эргэлтийн дутагдлаас үүсэх шокыг олон төрлөөр ангилж болох боловч үүсгэж байгаа шалтгаан, эмгэг жамын механизмаас нь хамааран цусны эзлэхүүн багасалтаас үүсэх, судас тэлэгдлээс үүсэх, зүрхний гаралтай хэмээн ангилан авч үздэг. Захын булчинлаг артерийн судаснуудын агшилт нь артерийн даралтыг нөхцөлдүүлж байдаг. Судасны гаралтай шок нь захын артерийн судасны агшилт сулран, судас тэлж, артерийн даралт буурснаар үүсдэг.
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