Meanings of difficult respiration in English

There is a tendency to fainting and to difficult respiration.

The symptoms are intensely difficult respiration and great depression.

Was in the year 1782 affected with a slight, but constant pain in his breast, with difficult respiration.

His breast heaved under his difficult respiration, but the gnawing hunger which agonized him made these sufferings seem light.

Second morning, horse apparently easier; temperature 102.5°, but very difficult respiration; laxative had operated during the night; ordered diffusible stimulants.

The swelling and inflammation of the throat, and the heavy, pus-like secretions that accumulate in the nasal cavities, cause difficult respirations.