Cardiomyopathy

Cardiomyopathy is a group of primary diseases of the heart muscle.[1] Early on there may be few or no symptoms.[1] As the disease worsens, shortness of breath, feeling tired, and swelling of the legs may occur, due to the onset of heart failure.[1] An irregular heart beat and fainting may occur.[1] Those affected are at an increased risk of sudden cardiac death.[2]

Cardiomyopathy
Opened left ventricle showing thickening, dilatation, and subendocardial fibrosis noticeable as increased whiteness of the inside of the heart.
SpecialtyCardiology
Symptoms
Complications
Types
Causes
TreatmentDepends on type and symptoms[5]
Frequency2.5 million with myocarditis (2015)[6]
Deaths354,000 with myocarditis (2015)[7]

Types of cardiomyopathy include hypertrophic cardiomyopathy, dilated cardiomyopathy, restrictive cardiomyopathy, arrhythmogenic right ventricular dysplasia, and Takotsubo cardiomyopathy (broken heart syndrome).[3] In hypertrophic cardiomyopathy the heart muscle enlarges and thickens.[3] In dilated cardiomyopathy the ventricles enlarge and weaken.[3] In restrictive cardiomyopathy the ventricle stiffens.[3]

In many cases, the cause cannot be determined.[4] Hypertrophic cardiomyopathy is usually inherited, whereas dilated cardiomyopathy is inherited in about one third of cases.[4] Dilated cardiomyopathy may also result from alcohol, heavy metals, coronary artery disease, cocaine use, and viral infections.[4] Restrictive cardiomyopathy may be caused by amyloidosis, hemochromatosis, and some cancer treatments.[4] Broken heart syndrome is caused by extreme emotional or physical stress.[3]

Treatment depends on the type of cardiomyopathy and the severity of symptoms.[5] Treatments may include lifestyle changes, medications, or surgery.[5] Surgery may include a ventricular assist device or heart transplant.[5] In 2015 cardiomyopathy and myocarditis affected 2.5 million people.[6] Hypertrophic cardiomyopathy affects about 1 in 500 people while dilated cardiomyopathy affects 1 in 2,500.[3][8] They resulted in 354,000 deaths up from 294,000 in 1990.[7][9] Arrhythmogenic right ventricular dysplasia is more common in young people.[2]

Signs and symptoms
The arrhythmia, ventricular fibrillation, seen on an ECG

Symptoms of cardiomyopathies may include fatigue, swelling of the lower extremities and shortness of breath after exertion.[10] Additional symptoms of the condition may include arrhythmia, fainting, and dizziness.[10]

Causes

Cardiomyopathies can be of genetic (familial) or non-genetic (acquired) origin.[11] Genetic cardiomyopathies usually are caused by sarcomere or cytoskeletal diseases, neuromuscular disorders, inborn errors of metabolism, malformation syndromes and sometimes are unidentified.[12][13] Non-genetic cardiomyopathies can have a definitive causes such as viral infections, myocarditis and others.[14][15]

Cardiomyopathies are either confined to the heart or are part of a generalized systemic disorder, both often leading to cardiovascular death or progressive heart failure-related disability. Other diseases that cause heart muscle dysfunction are excluded, such as coronary artery disease, hypertension, or abnormalities of the heart valves.[16] Often, the underlying cause remains unknown, but in many cases the cause may be identifiable.[17] Alcoholism, for example, has been identified as a cause of dilated cardiomyopathy, as has drug toxicity, and certain infections (including Hepatitis C).[18][19][20] Untreated celiac disease can cause cardiomyopathies, which can completely reverse with a timely diagnosis.[21] In addition to acquired causes, molecular biology and genetics have given rise to the recognition of various genetic causes.[19][22]

A more clinical categorization of cardiomyopathy as 'hypertrophied', 'dilated', or 'restrictive',[23] has become difficult to maintain because some of the conditions could fulfill more than one of those three categories at any particular stage of their development.[24]

The current American Heart Association (AHA) definition divides cardiomyopathies into primary, which affect the heart alone, and secondary, which are the result of illness affecting other parts of the body. These categories are further broken down into subgroups which incorporate new genetic and molecular biology knowledge.[25]

Mechanism

The pathophysiology of cardiomyopathies is better understood at the cellular level with advances in molecular techniques. Mutant proteins can disturb cardiac function in the contractile apparatus (or mechanosensitive complexes). Cardiomyocyte alterations and their persistent responses at the cellular level cause changes that are correlated with sudden cardiac death and other cardiac problems.[26]

Cardiomyopathies are generally varied individually. Different factors can cause Cardiomyopathies in adults as well as children. To exemplify, Dilated Cardiomyopathy in adults is associated with Ischemic Cardiomyopathy, Hypertension, Valvular diseases, and Genetics. While in Children, Neuromuscular diseases such as Becker muscular dystrophy, including X-linked genetic disorder, are directly linked with their Cardiomyopathies.[27]

Diagnosis
Normal sinus rhythm on EKG

Among the diagnostic procedures done to determine a cardiomyopathy are:[10]

Classification
Structural categories of cardiomyopathy
Stained microscopic section of heart muscle in hypertrophic cardiomyopathy

Cardiomyopathies can be classified using different criteria:[28]

Treatment

Treatment may include suggestion of lifestyle changes to better manage the condition. Treatment depends on the type of cardiomyopathy and condition of disease, but may include medication (conservative treatment) or iatrogenic/implanted pacemakers for slow heart rates, defibrillators for those prone to fatal heart rhythms, ventricular assist devices (VADs) for severe heart failure, or catheter ablation for recurring dysrhythmias that cannot be eliminated by medication or mechanical cardioversion. The goal of treatment is often symptom relief, and some patients may eventually require a heart transplant.[10]

See also

References
  1. "What Are the Signs and Symptoms of Cardiomyopathy?". NHLBI. 22 June 2016. Archived from the original on 15 September 2016. Retrieved 31 August 2016.
  2. "Who Is at Risk for Cardiomyopathy?". NHLBI. 22 June 2016. Archived from the original on 16 August 2016. Retrieved 31 August 2016.
  3. "Types of Cardiomyopathy". NHLBI. 22 June 2016. Archived from the original on 28 July 2016. Retrieved 31 August 2016.
  4. "What Causes Cardiomyopathy?". NHLBI. 22 June 2016. Archived from the original on 15 September 2016. Retrieved 31 August 2016.
  5. "How Is Cardiomyopathy Treated?". NHLBI. 22 June 2016. Archived from the original on 15 September 2016. Retrieved 31 August 2016.
  6. GBD 2015 Disease and Injury Incidence and Prevalence Collaborators (8 October 2016). "Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015". Lancet. 388 (10053): 1545–1602. doi:10.1016/S0140-6736(16)31678-6. PMC 5055577. PMID 27733282.
  7. GBD 2015 Mortality and Causes of Death Collaborators (8 October 2016). "Global, regional, and national life expectancy, all-cause mortality, and cause-specific mortality for 249 causes of death, 1980-2015: a systematic analysis for the Global Burden of Disease Study 2015". Lancet. 388 (10053): 1459–1544. doi:10.1016/s0140-6736(16)31012-1. PMC 5388903. PMID 27733281.
  8. Practical Cardiovascular Pathology. Lippincott Williams & Wilkins. 2010. p. 148. ISBN 978-1-60547-841-8. Archived from the original on 14 September 2016.
  9. GBD 2013 Mortality and Causes of Death Collaborators (17 December 2014). "Global, regional, and national age-sex specific all-cause and cause-specific mortality for 240 causes of death, 1990-2013: a systematic analysis for the Global Burden of Disease Study 2013". Lancet. 385 (9963): 117–71. doi:10.1016/S0140-6736(14)61682-2. PMC 4340604. PMID 25530442.
  10. "What Are the Signs and Symptoms of Cardiomyopathy? - NHLBI, NIH". nhlbi.nih.gov. Archived from the original on 28 July 2016. Retrieved 25 July 2016.
  11. Bakalakos, Athanasios; Ritsatos, Konstantinos; Anastasakis, Aris (1 September 2018). "Current perspectives on the diagnosis and management of dilated cardiomyopathy Beyond heart failure: a Cardiomyopathy Clinic Doctor's point of view". Hellenic Journal of Cardiology. 59 (5): 254–261. doi:10.1016/j.hjc.2018.05.008. ISSN 1109-9666. PMID 29807197. S2CID 44146977.
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Further reading
Look up cardiomyopathy in Wiktionary, the free dictionary.
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