At _______ patients exhibit elevated blood pressure only in a clinical setting.: ответ на тест 992201 - Английский язык

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A delicate heart operation was performed in a hermetically sealed high-pressure chamber at the Moscow Research Institute for Clinical and Experimental Surgery.
The operated man was 48-years old. He had been hardly able to move because he was suffering from a serious congenital valve defect.
Now this operation is considered not a very complex one. But in this patient there was a serious risk of blood clotting in the brain.
The risk became quite insignificant when the operation was performed in the high-pressure chamber. At normal air pressure the amount of oxygen in a patient’s blood remains unchanged even if he breathes in pure oxygen. In a pressure chamber the oxygen amount in the blood increases considerably. In a pressure chamber the surgeon is able to operate with greater freedom on vital organs such as the brain, heart or blood vessels.
But it is very hard to work under high pressure. When operations are performed at seven or eight atmosphere pressures, the operation can only last two and a half hours. The personnel in the chamber have to be changed.
Закончите предложение
In a pressure chamber the oxygen amount _______.

Прочитайте текст
A delicate heart operation was performed in a hermetically sealed high-pressure chamber at the Moscow Research Institute for Clinical and Experimental Surgery.
The operated man was 48-years old. He had been hardly able to move because he was suffering from a serious congenital valve defect.
Now this operation is considered not a very complex one. But in this patient there was a serious risk of blood clotting in the brain.
The risk became quite insignificant when the operation was performed in the high-pressure chamber. At normal air pressure the amount of oxygen in a patient’s blood remains unchanged even if he breathes in pure oxygen. In a pressure chamber the oxygen amount in the blood increases considerably. In a pressure chamber the surgeon is able to operate with greater freedom on vital organs such as the brain, heart or blood vessels.
But it is very hard to work under high pressure. When operations are performed at seven or eight atmosphere pressures, the operation can only last two and a half hours. The personnel in the chamber have to be changed.
Закончите предложение
In a pressure chamber the oxygen amount _______.

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