Karachi Studies Link Traumatic Brain Injury to High Mortality Rates

Two new studies published in JAMA Network Open and led by Weill Cornell Medicine researchers reveal that traumatic brain injuries in Karachi, Pakistan, carry severe long-term mortality rates. Analyzing data from a local trauma registry between December 2021 and May 2024, the findings show unexpected patient vulnerability long after hospital discharge.

Traumatic brain injuries in resource-limited settings carry a far heavier toll than previously understood, particularly during the precarious transition from hospital care back to everyday life. Two recent studies focusing on trauma registry patients in Karachi, Pakistan, tracked individuals for a full year following their injuries. The investigations, led by Weill Cornell Medicine researchers, provide a clear picture of long-term outcomes following head trauma in a low- and middle-income country where road traffic accidents drive the majority of cases.

Moderate and Severe Trauma Registry Findings in Karachi

Clinicians gauge patient alertness following head trauma using the Glasgow Coma Scale (GCS), a 15-point measure tracking eye, verbal, and motor responses. Severe traumatic brain injury is marked by a score of 3 to 8, indicating that individuals cannot follow commands or respond to pain and may face airway complications. Moderate traumatic brain injury spans scores from 9 to 12, where patients may appear confused yet remain capable of responding to simple commands.

The first of the two papers, published on August 11, examined 819 registry patients. Among them, 45 percent presented with moderate head injuries, while 55 percent faced severe trauma. While severe cases predictably carried the highest risk of death and disability, researchers encountered unexpected mortality among patients with moderate injuries who would normally be expected to recover more favorably.

By the 12-month mark, mortality reached nearly 60 percent for patients with moderate traumatic brain injury, while those with severe injuries faced an 88 percent mortality rate. For comparison, previous data from high-income countries recorded respective mortality rates of just 9 percent and 30 percent. Across both patient groups, older age, the absence of surgical intervention, and greater injury severity correlated with a heightened risk of death.

Reconsidering the Prognosis of Mild Brain Injuries

A second paper, published on August 13, shifted focus to 602 patients diagnosed with mild traumatic brain injury, defined by a GCS score of 13 to 15. These individuals typically remain awake and able to follow commands, though they frequently experience brief confusion or memory lapses. Investigators discovered that mild injuries do not share a uniform prognosis.

Patients sitting at the lower end of the mild GCS spectrum experienced substantially worse outcomes, including higher mortality and poorer quality of life during recovery, than individuals who scored a full 15. Researchers noted that some injuries classified and treated as mild may have actually been more serious. Furthermore, premature hospital discharge—with patients staying an average of only two days—may have contributed to these troubling figures. The overall 12-month mortality rate for the mild injury cohort reached 14 percent.

“We found that TBIs are responsible for a high number of trauma-related deaths in Pakistan, even with more mild to moderate injuries, which we were not expecting. Patients are falling through gaps in the trauma care system before, during and especially after hospitalization.”

Dr. Junaid Razzak, senior author and professor of emergency medicine at Weill Cornell

Gaps in the Chain of Survival and Economic Pressures

A significant proportion of deaths occurred during the initial month following discharge, highlighting acute vulnerability as patients moved from structured hospital environments to home life. The studies suggest that many of these fatalities and long-term disabilities could be prevented through stronger trauma systems, faster access to appropriate care, structured post-discharge monitoring, and expanded rehabilitation options.

Karachi Studies Link Traumatic Brain Injury to High Mortality Rates — Photo: News Medical

“My hunch is that even people with mild disabilities, who are already living at the edge of poverty, fall below the poverty line when they can’t work or perform basic tasks. Then their access to basic healthcare and ability to take care of themselves drops significantly.”

Dr. Junaid Razzak, emergency medicine physician at NewYork-Presbyterian/Weill Cornell Medical Center

The research points to systemic breakdowns throughout the medical response chain, from initial accident management to emergency room triage. Investigators identified a fractured emergency network where bystanders lack accident response training, ambulance drivers struggle to locate hospitals with open beds, and emergency providers race against tight clinical windows.

Future Directions and Remote Monitoring Proposals

Addressing these mortality disparities will require a fundamental reassessment of how regional medical systems handle acute head trauma. The research team proposed that telehealth platforms and regular remote follow-ups could offer a practical mechanism for tracking patient recovery and identifying complications before they become fatal.

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“A broken ‘chain of survival’ exists, in which bystanders don’t know how to respond to an accident, ambulance drivers don’t know which hospitals have open beds and emergency room healthcare providers race against the clock. Treatment in the first 48 hours is critical for better outcomes.”

Dr. Junaid Razzak, senior author

Future investigative efforts led by Dr. Razzak will focus on designing trauma care networks capable of routing patients efficiently to properly equipped facilities, with particular emphasis on securing treatment during the critical first 48 hours after injury.