Pediatric Dilated Cardiomyopathy Differential Diagnoses
- Author: Poothirikovil Venugopalan, MBBS, MD, FRCP(Glasg), FRCPCH; more...
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- Table 1. Factors Identified as Causes of Myocardial Damage
- Table 2. Summary of Genetic Loci and Disease Genes for Familial Dilated Cardiomyopathy
- Table 3. Diagnosis of Dilated Cardiomyopathy in Children - Step I: Diagnosis
- Table 4. Diagnosis of Dilated Cardiomyopathy in Children - Step II: Identification of Any Underlying Etiology
| Category Of Factors | Specific Factors |
| Viral infections (myocarditis) | Coxsackievirus B, human immunodeficiency virus, echovirus, rubella, varicella, mumps, Epstein-Barr virus, cytomegalovirus, measles, polio |
| Bacterial infections | Diphtheria, Mycoplasma, tuberculosis, Lyme disease, septicemia |
| Rickettsia | Psittacosis, Rocky Mountain spotted fever |
| Parasites | Toxoplasma, Toxocara, Cysticercus |
| Fungi | Histoplasma, coccidioidomycoses, Actinomyces |
| Neuromuscular disorders | Duchenne or Becker muscular dystrophies, Friedreich ataxia, Kearns-Sayre syndrome, other muscular dystrophies |
| Nutritional factors | Kwashiorkor, pellagra, thiamine deficiency, selenium deficiency |
| Collagen vascular diseases | Rheumatic fever, rheumatoid arthritis, systemic lupus erythematosus, dermatomyositis, Kawasaki disease |
| Hematological diseases | Thalassemia, sickle cell disease, iron deficiency anemia |
| Coronary artery diseases | Anomalous left coronary artery from pulmonary artery, infarction |
| Drugs | Anthracycline, cyclophosphamide, chloroquine, iron overload |
| Endocrine diseases | Hypothyroidism, hyperthyroidism, hypoparathyroidism, pheochromocytoma, hypoglycemia |
| Metabolic disorders | Glycogen-storage diseases, carnitine deficiency, fatty acid oxidation defects, mucopolysaccharidoses |
| Malformation syndromes | Cri-du-chat (cat-cry) syndrome |
| Clinical Pattern | Identified Genetic Loci | Identified Disease Genes |
| Autosomal dominant (AD) | 10q21-10q23, 9q13-q22, 1q32, 15q14, 2q31, 1q11-21 | Actin, desmin, lamin A/C |
| AD with conduction defect | 1p1-1q1, 3p22-3p25 | ... |
| X-linked (XL) | Xp21 | Dystrophin |
| XL cardio-skeletal (Barth syndrome) | Xq28 (gene G4.5) | Tafazzin |
| Approach | Findings | Conclusion |
| Clinical suspicion | Infants and young children: Shortness of breath, feeding difficulties, wheezing, failure to thrive, recurrent chest infections, hepatomegaly, cardiomegaly Older children: Dyspnea, dependent edema, elevated jugular venous pressure, cardiomegaly | Probable heart disease with heart failure |
| Chest radiography | Cardiomegaly, pulmonary plethora, prominent upper lobe veins, pulmonary edema, pleural effusion, collapsed left lower lobe | High probability of heart failure with or without chest infection |
| Electrocardiography | Low-voltage complexes | Pericardial effusion |
| Presence of Q waves and inversion of T waves in leads I, II, aVL, and V4 through V6 (anterolateral infarction pattern) | Anomalous left coronary artery from pulmonary artery | |
| Significant arrhythmia | Dilated cardiomyopathy secondary to arrhythmia | |
| Left ventricular or biventricular hypertrophy with or without left ventricular strain pattern | Often unhelpful | |
| Doppler echocardiographic studies | Significant congenital heart disease | Diagnose primary disease |
| Significant pericardial effusion with satisfactory left ventricular ejection fraction | Diagnose pericardial effusion | |
| Left ventricular posterior wall hypokinesia with hyperechoic papillary muscles, retrograde continuous flow into proximal pulmonary artery | Diagnose anomalous left coronary artery from pulmonary artery | |
| Dilated left ventricle (>95th percentile) with global hypokinesia (fractional shortening < 25%, ejection fraction < 50%), and no demonstrable structural heart disease | Diagnose dilated cardiomyopathy |
| Approach | Findings | Conclusion |
| Clinical features | Positive family history | Genetic cause for dilated cardiomyopathy |
| Acute or chronic encephalopathy, muscle weakness, hypotonia, growth retardation, recurrent vomiting, lethargy | Inborn error of metabolism involving energy production | |
| Coarse or dysmorphic features, organomegaly, skeletal abnormalities, short stature, chronic encephalopathy, cherry-red spot in eyes | Storage diseases | |
| Skeletal muscle weakness without encephalopathy | Neuromuscular disorders | |
| Blood investigations | High blood urea nitrogen and creatinine levels, low calcium and magnesium levels, electrolyte disturbances | Help in the initial management; occasionally point to a cause of dilated cardiomyopathy, especially in neonates |
| Elevated acute-phase reactants and cardiac enzyme levels | Myocarditis | |
| Positive viral titers | Viral myocarditis | |
| Low serum carnitine levels | Systemic carnitine deficiency | |
| Hypoglycemia with low or no acidosis (ketosis) 1. High insulin levels, low free fatty acid 2. Low insulin levels, high free fatty acid | 1. Infant of diabetic mother, nesidioblastosis 2. Defect in fatty acid oxidation or carnitine metabolism | |
| Hypoglycemia with moderate or high acidosis (ketosis) 1. Low or normal lactate and abnormal urine and serum organic acid levels 1. High lactate | 1. Organic (propionic, methylmalonic) acidemias, or ß-ketothiolase deficiency 2. Glycogen storage disease, Bath and Sengers syndromes, pyruvate dehydrogenase deficiency, mitochondrial enzyme deficiency | |
| Hyperammonemia with acidosis | Organic acidemias (as above) | |
| Specific enzyme assay | Confirms enzymatic defect | |
| Absence of above physical and biochemical abnormalities | Post myocarditis or idiopathic dilated cardiomyopathy | |
| Cardiac catheterization | Evaluate hemodynamics | Useful to predict prognosis and evaluate for transplant |
| Coronary angiography | Abnormal origin of left coronary artery from pulmonary artery | Anomalous left coronary artery from pulmonary artery |
| Myocardial biopsy | Myocyte hypertrophy and fibrosis without lymphocytic infiltrate | Dilated cardiomyopathy |
| Inflammatory cell infiltration, cell necrosis | Myocarditis | |
| Special stains | Mitochondrial or infiltrative diseases | |
| Molecular studies (on blood, fibroblasts, or myocardial cells) | Nucleic acid hybridization studies Polymerase chain reaction studies | Myocarditis |
| DNA mutation analysis | Identifies specific genetic defect |

