Restrictive Cardiomyopathy

Restrictive Cardiomyopathy Overview

Restrictive cardiomyopathy is the least common form of cardiomyopathy. It occurs in the advanced stages of myocardial infiltrative disease — e.g. due to haemochromatosis, amyloidosis or sarcoidosis.

  • Diffuse myocardial infiltration leads to low voltage QRS complexes.
  • Atrial fibrillation may occur due to atrial enlargement; ventricular arrhythmias are also common.
  • Infiltration of the cardiac conducting system (e.g. due to septal granuloma formation in sarcoidosis) may lead to conduction disturbance — e.g. bundle branch blocks and AV block.
  • Healing granulomas in sarcoidosis may produce “pseudo-infarction” Q waves.

ECG Features of Restrictive Cardiomyopathy

  • Low voltage QRS complexes
  • Non-specific ST segment / T wave changes
  • Bundle branch blocks
  • Atrioventricular block (3rd degree AV block may occur in sarcoidosis)
  • Pathological Q waves
  • Atrial and ventricular dysrhythmias

Example ECGs

ECG low QRS voltage

Related Topics


References


LITFL Further Reading


Advanced Reading


ECG LIBRARY 700

ECG LIBRARY

Electrocardiogram

Emergency Physician in Prehospital and Retrieval Medicine in Sydney, Australia. He has a passion for ECG interpretation and medical education | ECG Library |

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