Headache Trajectories Differ Five Years After TBI

BOSTON—Over five years after traumatic brain injury (TBI), a relatively large (24% to 30%) group of individuals experience chronic headache pain and a significant functional impact of headache, according to a pattern analysis of headache pain and impact following moderate to severe TBI. These results were presented at the 59th Annual Scientific Meeting of the American Headache Society. “Identification of members within these groups may be important to assist with an appropriate intensity of treatment to improve satisfaction with life and employment opportunity after TBI,” said Sylvia Lucas, MD, PhD, Clinical Professor of Neurology and Neurological Surgery at the University of Washington in Seattle. “The identification of trajectory membership may also be useful in evaluation of appropriate subjects for inclusion in studies of headache treatment after TBI.”

Sylvia Lucas, MD, PhD

Headache is the most common symptom following TBI of any severity. Dr. Lucas and her research colleagues have previously reported high rates of headache in a prospective cohort of patients who experienced moderate to severe TBI. These patients have been followed for five years. New or worse headache occurred at a rate of 37% at three months, 33% at six months, 34% at 12 months, and 35% at 60 months post injury. The present study examined whether certain patterns or trajectories of headache occur over five years after TBI and whether demographic or injury characteristics are related to these trajectories. Trajectory type was also examined in relation to satisfaction with life and employment status five years after injury.

Data on 316 individuals were evaluated at five years. These patients were initially enrolled during inpatient rehabilitation after moderate to severe TBI. Enrollment was performed in person in the hospital. Structured telephone interviews were conducted at three, six, 12, and 60 months after TBI. At each time point, individuals who reported headache in the previous three months were asked to rate their headache pain on a 0 to 10 scale (0 = no pain, 10 = worst pain) and to complete the Headache Impact Test (HIT-6). Discrete mixture modeling was used to estimate trajectory groups based on pain rating and on headache impact scores.

Four trajectories were found for headache pain over five years: minimal pain over time (25% of individuals), worsening pain over time (37%), improving pain over time (7%), and chronic pain over time (30%). A chronic pain trajectory was more common in females, those incurring TBI by violence, those who were unemployed prior to injury, those with a headache history prior to injury, and those with mental health problems. Those with a chronic pain trajectory had significantly lower satisfaction with life five years after injury, compared with other trajectory groups.

A chronic impact trajectory was more common in females and in those who incurred TBI by violence, had a prior history of headache, or were unemployed prior to injury. At five years post TBI, the chronic impact group was significantly more likely to be unemployed and less satisfied with life, compared with individuals in the minimal or worsening impact trajectory groups. Those employed prior to injury were more frequently in the worsening group for pain and impact, compared with those not employed prior to injury. No relationship was found for other demographic and injury data, including age, posttraumatic amnesia, or substance abuse prior to injury.