I wonder if the scene in the movie Pulp Fiction, where a girl (Marsellus Wallace's wife), in a bad health situation after taking too much heroin, is brought to life by a direct prick of adrenalin in her heart is a real "medical" practice or it's just a joke from the scenarist.
There's a Straight Dope column that covers this question, it notes that there is an element of truth to the scene:
I found a few articles on ICI:
The Straight Dope article goes on to point out a number of inaccuracies with the scene, including:
National Institute of Health - Heroin overdose
British Medical Journal - Degree and Duration of Reversal by Naloxone of Effects of Morphine in Conscious Subjects
Finally, for a more realistic portrayal of heroin overdose I'd recommend this scene from Trainspotting note - contains swearing (and drug use).
I am an ER doctor and have never given an intracardiac injection of any medication. I have run and assisted with 100s of cardiac arrest and have never seen or heard of it being done, other than in the movies. This would be very dangerous and could lead to a pneumothorax, coronary artery injury, or pericardial tamponade.