The inquest was told that a number of people had been collapsing and having fits at the party at which it was heard damp cocaine was ingested by some people.
John Grey and 21-year-old Kevin Doyle died following the party and more than a dozen others were taken to hospital.
Pathologist Dr Margaret Bolster gave evidence that cocaine causes the heart to go into abnormal patterns of beating and said that there was a lack of oxygen getting to the brain.
She said John Grey's death was caused by cardiac arrest following ingestion of cocaine.
The inquest into Kevin Doyle's death took place in November 2008.
