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    Myocardial contusion

    Blunt myocardial injury

    Myocardial contusion is a bruise of the heart muscle.

    Causes

    The most common causes are:

    • Car accidents
    • Person getting hit bya car
    • Cardiopulmonary resuscitation (CPR)
    • Falling from a height greater than 20 feet

    Symptoms

    A severe myocardial contusion may lead to signs and symptoms of a heart attack.

    Symptoms can include:

    • Pain in the front of the ribs or breastbone
    • Feeling that your heart is racing
    • Light-headedness
    • Nausea or vomiting
    • Shortness of breath
    • Weakness

    Exams and Tests

    The doctor or nurse will perform a physical exam. This mayshow:

    • Bruise or scrapes on the chest wall
    • Crunching sensation when touching the skin, if there are rib fractures and puncture of the lung
    • Fast heartbeat
    • Irregular heartbeat
    • Low blood pressure
    • Rapid or shallow breathing
    • Tenderness to the touch
    • Abnormal chest wall movement from rib fractures

    Tests may include:

    • Blood tests (cardiac enzymes, such as Troponin-1 or CKMB)
    • Chest x-ray
    • CT scan of the chest
    • Electrocardiogram (ECG or EKG)
    • Echocardiogram

    These tests may show:

    • Problems with the heart wall and the ability for the heart to contract
    • Fluid or blood in the thin sac surrounding the heart (pericardium)
    • Rib fractures, lung or blood vessel injury
    • Problem with the heart's electrical signaling(such as a bundle branch block or other heart block)
    • Fast heart beat starting at the sinus node of the heart (sinus tachycardia)
    • Abnormal heartbeast starting in the ventricls or lower chambers of the heart (ventricular dysrhythmia)

    Treatment

    You will be closely monitored for 24 hours. An electrocardiogram (ECG) will be done continually tocheck your heart function.

    Emergency room treatment may include:

    • Catheter placement through a vein (IV)
    • Medications to relieve pain, heart rate disturbances,or low blood pressure
    • Pacemaker (temporary, may be permanent later)
    • Oxygen

    Other therapies may be used to treat a heart injury, include:

    • Chest tube placement
    • Draining blood from around the heart
    • Surgery to repair blood vessels in the chest

    Outlook (Prognosis)

    A complete recovery is usually seen in those with a mild myocardial contusion.

    Serious heart injuries can increase your risk for heart failure or heart rhythm disturbances.

    Prevention

    The following safety tips may helpprevent a heart bruise:

    • Wear a seat belt when driving
    • Choose a car with air bags
    • Take appropriate safety precautions when working at heights

    References

    Hamilton RS. Myocardial contusion. In: Rosen P, Barkin RM, Hayden Sr, Schaider JJ, Wolfe R, eds. Rosen and Barkin's 5-Minute Emergency Medicine Consult. 3rd ed. Philadelphia, Pa: Lippincott Williams & Wilkins; 2007.

    Eckstein M, Henderson SO. Thoracic Trauma. In:Marx, JA, ed. Rosen’s Emergency Medicine. 7th ed. Saint Louis, Mo: Mosby Elsevier: 2009: chap 42.

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            Tests for Myocardial contusion

              Review Date: 4/11/2012

              Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.

              The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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