I think it is a preposition - used to indicate something that is being assumed or considered.
This condition can lead to heart failure
Yes.
No not at all, if you take steroids they can lead to heart failure.
Diagnosis: Congestive heart failure. What is the condition?
Im not a doctor but that sounds a lot like a heart attack.
I'm a complete failure. He suffered of kidney failure.
We had a power failure due to the storm.
Because he didn't have a job, most people considered him a failure in life.
Her selfishness was apparent when she refused to share her food with her hungry friend.
sure.
Limitations would be the length of your sentence; that which you would be required to do once your Probabtation or Parole officer has violated you for Failure to Comply with the law and language of your sentence.
There was no excuse for the team's failure.
The event was a colossal failure
While you could construct the sentence in that way it might be more usual to use a different form such as... He was destined for failure in the examination.
His obstinate attitude led to the failure of his marriage.
The wretchedness of failure is the great attraction of success
A fatalist will usually not even try because of their belief in failure.