Patients in the trial received either the drug or a placebo.

That was about twice the rate of those who received placebo.

That compared with about 35 percent of those who received a placebo.

Participants do not know if they receive the drug or placebo.

Among the heart failure patients receiving a placebo, 29 percent died within the same period.

The same was not true for subjects receiving a placebo.

Patients received the challenge or placebo for five days with a two week interval between.

This was 68 fewer than the 1,981 deaths among the 27,428 who received a placebo.

This was 36 fewer than the 653 deaths among the 9,442 patients who received a placebo.

This was 122 fewer than the 2,008 deaths among the 27,382 patients who received a placebo.