Gun injuries: Are they getting more deadly?

New research suggests that between the years 2000 and 2013, the injuries sustained by victims of firearms violence grew both more severe and more deadly, even as mortality from other traumatic injuries declined.

Just days after the nation’s worst mass shooting took place at a nightclub in Orlando, Fla., the Journal of the American Medical Association on Tuesday published the findings of a study focusing on close to 30,000 trauma patients who were treated at a single hospital system in Denver. Tracking the types and severity of traumatic injuries in patients brought to the hospital over 14 years, the new research found that the death rate for hospitalized gunshot victims climbed an average of 6 percent every two years.

The rising fatality rates occurred against the backdrop of gunshot wounds that were also escalating in severity. Over the study period, ambulances brought in an increasing number of firearms victims with two or more bullet wounds and injuries over more regions of their bodies.

Injuries grew progressively more severe among victims of stabbing and pedestrian accidents as well. But unlike those hurt in firearms incidents, patients who were stabbed or run over were not progressively more likely to die of their injuries during the study.

“I doubt this is a failure of the trauma or emergency medical system” that transports injured patients to the hospital, said Brown University emergency physician Megan Ranney, who studies firearms injury.

Physicians and policymakers have refined practices both in hospital trauma care and emergency care in the field to improve the prognosis for trauma victims, added Ranney, who was not involved in the current study. “We’ve decreased fatality rates from every type of injury except guns,” she added, and why that is happening is a mystery, she said.

The new research comes against the backdrop of growing evidence that firearms violence is not only becoming more common; it is becoming more deadly. In a 2013 study published in the journal of Trauma and Acute Care Surgery, researchers found an increase in firearms victims between 2000 and 2011 coming in with – and dying of – more extensive wounds. In the same year, the Journal for Surgical Research published a 20-year retrospective of pediatric gunshot wounds, finding that in Miami-Dade County, the number of patients with multiple gunshot wounds increased. At a busy emergency department in Washington, D.C., researchers writing in Archives of Surgery reported that between 1988 and 1990, the average number of gunshot entry wounds per patient brought in after a shooting rose from 1.44 to 2.04.

Dr. Garen Wintemute, a University of California, Davis injury-prevention researcher and emergency department physician, said the trend of more severely injured firearms victims “may reflect the increasing ammunition capacity of firearms used in violence.” Shooters may be more heavily armed, and armed with weapons that can wreak more destruction more efficiently.

As an example, military-style semi-automatic weapons have proliferated among Americans since 2004, when Congress let a 20-year ban on civilian ownership of such guns expire. A database of mass shootings in the United States maintained by the publication Mother Jones shows that seven of the 10 U.S. mass shooting incidents with the highest number of casualties were carried out with military-style semi-automatic weapons. In addition to last weekend’s shooting in Orlando, those include the December 2015 San Bernardino attacks in which 14 were killed and 20 wounded; the 2012 movie theater rampage in Aurora, Colo., in which 12 were killed and 58 wounded; and the Newtown, Conn., shooting at an elementary school that claimed the lives of 26 people and wounded two more.