You must also understand that there will be no physician to place in a stent, only God can heal the destruction of the heart that God destroys. If the heart attack does not prove enough to bring about faithfulness, then people will endure chest pain after agonizing chest pain - attack after attack. This is their outcome.
As for what the blockage is, and what the heart is, I don't yet know. But I do know that the blockage will destroy the heart bit by bit. This heart attack will destroy pointless sensitivities and distractions (such as religion and multitudes of 'my truths' and philosophies and opinions) and force people to look at the much bigger picture. This heart attack will force people to be honest with themselves about themselves and about God.
God will become the burden of humanity because this heaven is hell, and this is unacceptable to God, Christ, and the righteous walking barefoot in God's Garden.