(Cardiomyopathy, Hypertrophic—Child; HCM—Child; Idiopathic Hypertrophic Subaortic Stenosis—Child; Asymmetric Septal Hypertrophy—Child; ASH—Child; HOCM—Child; Hypertrophic Obstructive Cardiomyopathy—Child)
DefinitionHypertrophic cardiomyopathy (HCM) is a form of cardiomyopathy . This is a condition in which the heart muscle thickens due to genetic problems with the muscle’s structure. As the muscle thickens, it must work harder to pump blood. This strains the heart muscle. Sometimes, the thickened muscle gets in the way of the blood leaving the heart and causes a blockage. This blockage can cause a nearby valve to become leaky. HCM can cause uneven muscle growth. This can cause the heart to pump in a disorganized way. Rarely, it can cause abnormal heart rhythms that can be fatal.
|Normal Heart and Heart With Hypertrophic Cardiomyopathy|
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CausesHCM may be caused by a gene that causes an abnormality in the heart muscle. It can be inherited or it can happen from changes in the genes over time.
Risk FactorsHaving a family member with HCM is a risk factor for your child.
SymptomsSymptoms may include:
- Chest pain
- Fainting, particularly during exercise
- Lightheadedness, particularly following exercise
- Rapid heartbeat
- Shortness of breath or difficulty breathing
- General fatigue
- Tiring easily during exercise or activity
- Fast, heavy breathing when feeding
- Sweating when feeding
- Tiredness or inactivity
- Poor weight gain
DiagnosisYou will be asked about your child’s symptoms and medical history. A physical exam will be done.Images may be taken of your child's bodily structures. This can be done with:
- Stress test
- Heart monitor
TreatmentTreatment focuses on controlling symptoms and preventing complications. Talk with the doctor about the best treatment plan for your child. Treatment options include:
MedicationsMedications may be used to help maintain proper and regular heart function. They may also be used to remove excess fluid from the body. If your child has an arrhythmia, anti-arrhythmic drugs may be given. Your child may also need blood-thinning medication.
SurgeryThe thickened portion of the heart muscle is cut and removed. This may be needed if your child has severely blocked blood flow from the heart or if the blockage causes a problem with the other heart valves and structures. If the mitral valve is leaking, surgery may also be done to repair or replace the mitral valve if needed.
Implantable Cardioverter Defibrillators (ICD)An ICD is implanted if your child is at increased risk for sudden death.
PreventionIf a family member has been diagnosed with HCM, your child should be screened for the condition.
American Heart Association
Canadian Cardiovascular Society
Heart and Stroke Foundation of Canada
Cardiomyopathy in children. Cincinnati Children’s Hospital website. Available at: http://www.cincinnatichildrens.org/health/heart-encyclopedia/disease/cardiomyopathy.htm. Updated March 2013. Accessed November 3, 2014.
Erwin JP, Nishimura RA, et al. Dual chamber pacing for patients with hypertrophic obstructive cardiomyopathy: a clinical perspective in 2000. Mayo Clin Proc. 2000;75:173-180.
Hypertrophic cardiomyopathy. The Cleveland Clinic website. Available at: http://my.clevelandclinic.org/heart/disorders/hcm/default.aspx. Updated June 2013. Accessed November 3, 2014.
Hypertrophic cardiomyopathy. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed. Updated May 19, 2014. Accessed November 3, 2014.
Maron BJ, Nishimura RA, McKenna WJ, et al. Assessment of permanent dual chamber pacing for patients with hypertrophic cardiomyopathy. Circulation. 1999;99:2927-2933.
McCully RB, Nishimura RA, Tajik AJ, Schaff HV, Danielson GK. Extent of clinical improvement after surgical treatment of hypertrophic obstructive cardiomyopathy. Circulation. 1996;94:467-471.
Pediatric cardiomyopathies. The American Heart Association website. Available at: http://www.heart.org/HEARTORG/Conditions/More/CardiovascularConditionsofChildhood/Pediatric-Cardiomyopathies%5FUCM%5F312219%5FArticle.jsp. Updated September 3, 2014. Accessed November 3, 2014.
- Reviewer: Kari Kassir, MD
- Review Date: 12/2014
- Update Date: 12/20/2014
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