Introduction 
It is a known fact that both mechanical and manual CPR may cause injuries. These injuries have in a recent study been characterized and summarized. The authors find that no studies, including their own, have found these injuries to be fatal though they may be associated with higher morbidity. Our aim were to investigate and describe potential injuries who were deemed to be fatal had the patient survived. 

Method 
In a retrospective case series, patients treated with LUCAS, who were subsequently autopsied were included. Patients with trauma, known pregnancy or age below 18 were excluded. Injuries were categorized to be potentially life-threatening by the forensic pathologists. 

Results 
Three cases were deemed potentially fatal in a case series including 50 cases, all had severe visceral injuries. Two case were not deemed potentially life-threatening, but could be associated with higher morbidity. Case one: 22-year old female with a large laceration of the lung, spleen rupture, bleeding in the kidney. Case two: 49-year old female with massive pericardial tamponade and hemothorax. Case three: Rupture of the aorta causing dissection and hemothorax. 
The two cases with higher morbidity involved a 51-year old male with bilateral pneumothoraxes and a 51-year old with tension pneumothorax. 
In case two, a life-saving treatment, Extra Corporal Membrane Oxygenation (ECMO), could not be initiated due to hypovolemia. 

Conclusion 
In contrast to previous studies, we find potentially life-threatening injuries after treatment with LUCAS.

3 - Mechanical chest compression – cure or culprit?