The other thing is the the deaths were reviewed by an independent committee and they found that at least 6 of the 7 were definitely unrelated to neudexta. I would be concerned if the deaths were cardiac arrest related, as that is the most obvious thing that makes sense if you think...
QT prolongation --> Torsades --> Vtach --> death
but since the deaths were respiratory, they were judged to be likely from natural progression of disease.