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This article in the Jan/March 2011 Prehospital Emergency Care studied non-traumatic out of hospital cardiac arrest. They only looked at patients who were successfully intubated, i.e. they excluded patients who could not be intubated due to difficult airways. They did that to try to focus the study on the question of whether or not intubation helps and not on issues of procedural competence.
They found that in general patients did not benefit from prehospital intubation and that VF/VT arrests did worse when intubated.
In their discussion they speculate that the reasons might be unrecognized, misplaced tubes, accidental hyperventilation, positive pressure ventilation in general and the fact that the intubation procedure takes away from other actions such as defibrillation, compressions and medication administration.
They found that in general patients did not benefit from prehospital intubation and that VF/VT arrests did worse when intubated.
In their discussion they speculate that the reasons might be unrecognized, misplaced tubes, accidental hyperventilation, positive pressure ventilation in general and the fact that the intubation procedure takes away from other actions such as defibrillation, compressions and medication administration.