11.   But the slightest variation in the quantity or purity of the drug can produce unconsciousness and even respiratory failure and death.

12.   Carol Belles, his secretary, said the cause was respiratory failure.

13.   David suffered respiratory failure there and was put on a ventilator.

14.   Demetrius McAllister died in his sleep last fall from respiratory failure.

15.   Doctors listed the cause of death as respiratory failure and cardiopulmonary arrest.

16.   Gentry died of respiratory failure, said Joyce Timpson, a family spokeswoman.

17.   Further, they said someone dying of a codeine overdose would deteriorate over a few hours rather than going into respiratory failure so quickly.

18.   Haberler died of respiratory failure caused by pneumonia, said James E. DeVol, a funeral director at the DeVol Funeral Home, in Washington.

19.   Hantavirus, carried by mice, can cause rapid, fatal respiratory failure.

20.   Haley, who had been in poor health in recent years, was hospitalized on Friday and died of respiratory failure, said his longtime assistant, Kelly Brandt.