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Blunt Cardiac Injury

Matthew DeLaney, MD, FACEP, FAAEM and Megan Fix, MD

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The summary below is from an episode of ERcast: Clinical Perspectives

Blunt cardiac injury is an underrecognized cause of chest pain, tachycardia, dysrhythmia, and shock after thoracic trauma. In suspected BCI, a normal ECG plus a normal troponin essentially rules it out, while hypotension or a new arrhythmia should push you toward echocardiography.

Blunt Cardiac Injury Evaluation

  • High-risk clinical clues: Chest pain after blunt thoracic trauma and tachycardia out of proportion to pain control or bleeding are the two bedside findings most likely to raise suspicion for BCI.
  • Mechanism and injury spectrum: BCI spans direct impact, deceleration, blast, and indirect injury, ranging from myocardial contusion to coronary dissection, valve injury, papillary muscle tear, and rupture.
  • Rule-out test pair: A normal ECG together with a normal troponin essentially excludes BCI, making this the key screening combination when the diagnosis is on your differential.
  • ECG findings that matter: New dysrhythmia, ST-segment change, or heart block should be treated as abnormal screening findings, while isolated sinus tachycardia does not by itself make the diagnosis.
  • When to admit or echo: Any abnormal ECG or troponin warrants admission, and hypotension or a new arrhythmia is the trigger for echocardiography. We walk through the protocol logic in the episode.
  • CT and advanced imaging: Chest CT is the workhorse study for blunt thoracic trauma, and cardiac CT or MRI can help separate traumatic cardiac injury from true STEMI when catheterization decisions get messy.

Commotio Cordis Recognition

  • Classic arrest mechanism: Commotio cordis is ventricular fibrillation triggered by a blunt precordial blow, classically from a ball or fist, causing sudden collapse without structural penetration.
  • Who gets affected: The syndrome is overwhelmingly seen in males and usually in patients younger than 20, especially during baseball, softball, hockey, football, soccer, and lacrosse.
  • Immediate lifesaving response: Prompt bystander CPR and rapid AED use are the interventions that change survival, with mortality falling dramatically as public access defibrillation has spread.
  • Prevention strategies: Risk reduction includes softer baseballs for younger players and sport-specific chest protection, although prevention has practical limits that are worth hearing in the chapter.
  • Survivor emergency workup: Patients who survive the initial event still need ECG, continuous cardiac monitoring, basic labs, and cardiology admission because malignant rhythm complications can recur.

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References:

  1. Leite L, et al. Cardiac injuries caused by trauma: Review and case reports. J Forensic Leg Med. 2017 Nov;52:30-34. PMID: 28850860.
  2. Gao JM, et al. Blunt Cardiac Injury: A Single-Center 15-Year Experience. Am Surg. 2020 Apr 1;86(4):354-361. PMID: 32391760.
  3. Huis In 't Veld MA, et al. Blunt Cardiac Trauma Review. Cardiol Clin. 2018 Feb;36(1):183-191. PMID: 29173678.
  4. Sadaba JR, et al. Management of isolated sternal fractures: determining the risk of blunt cardiac injury. Ann R Coll Surg Engl. 2000 May;82(3):162-6. PMID: 10858676.
  5. Clancy K, et al; Eastern Association for the Surgery of Trauma. Screening for blunt cardiac injury: an Eastern Association for the Surgery of Trauma practice management guideline. J Trauma Acute Care Surg. 2012 Nov;73(5 Suppl 4):S301-6. PMID: 23114485.
  6. Marcolini EG, Keegan J. Blunt Cardiac Injury. Emerg Med Clin North A

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