Systolic dysfunction and reduction in left ventricular ejection fraction (LVEF) has been documented after traumatic brain injury (TBI). Speckle tracking is an emerging technology for myocardial strain assessment which has been utilized to identify subclinical myocardial dysfunction, and is most commonly reported as global longitudinal strain (GLS). We examined myocardial strain and regional strain patterns following moderate-severe TBI.
We conducted a prospective cohort study of moderate-severe TBI patients (Glasgow Coma Scale≤12) and age/sex-matched controls. Transthoracic echocardiography was performed within the first day and 1 week following TBI. Myocardial function was assessed using both GLS and LVEF, and impaired systolic function was defined as GLS >−16% or LVEF ≤50%. Regional strain patterns and individual strain trajectories were examined.
Thirty subjects were included, 15 patients with TBI and 15 age/sex-matched controls. Among patients with adequate echocardiographic windows, systolic dysfunction was observed in 2 (17%) patients using LVEF and 5 (38%) patients using GLS within the first day after TBI. Mean GLS was impaired in patients with TBI compared with controls (−16.4±3.8% vs. −20.7±1.8%, P=0.001). Regional myocardial examination revealed impaired strain primarily in the basal and mid-ventricular segments. There was no improvement in GLS from day 1 to day 7 (P=0.81).
Myocardial strain abnormalities are common and persist for at least 1 week following moderate-severe TBI. Speckle tracking may be useful for the early diagnosis and monitoring of systolic dysfunction following TBI.
*Department of Anesthesiology
¶Department of Neurology
#Department of Internal Medicine, Division of Cardiology, Duke University, Durham, NC
Departments of §Anesthesiology & Pain Medicine
†Harborview Injury Prevention & Research Center, University of Washington, Seattle, WA
‡Department of Internal Medicine, Division of Cardiology, Henry Ford Health System, Detroit, MI
**Department of Internal Medicine, Division of Cardiology, Yale University, New Haven, CT
Supported by NIH L30 NS084420.
The authors have no conflicts of interest to disclose.
Address correspondence to: Vijay Krishnamoorthy, MD, PhD, Department of Anesthesiology, Duke University, 2301 Erwin Road, Durham, NC 27710 (e-mail: firstname.lastname@example.org).
Received August 24, 2018
Accepted December 9, 2018