In all of last year, there were only 22 days when someone wasn’t shot in Philadelphia. Nearly 1 in 5 victims died.

Now, in a bold effort to stem the bloodshed, several Philadelphia hospitals are about to conduct a citywide experiment that will ask: When gunshot or stabbing victims are being rushed to the emergency room by ambulance, could paramedics do more to save them by doing less?

It’s a counterintuitive approach that could test long-held beliefs and change practices at trauma centers across the country.

And every resident of or visitor to Philadelphia could become a study subject, though the biggest effect will probably be in the most violent neighborhoods - poor, mostly black sections where people are skeptical of essentially being experimented on.

During the study, paramedics treating adults who have been shot or stabbed in the torso will, on a random basis, not insert a tube down a victim’s throat or administer intravenous fluids - two traditional life-saving techniques some doctors say may actually harm such patients.

Normally, paramedics intubate patients to keep their airway open, and give IV fluids to counteract a drop in blood pressure. But supporters of the study say that for victims who are bleeding through an open wound, these procedures may cause an increase in blood pressure that can accelerate blood loss and death.