What distinguishes structural heart disease from coronary artery disease?

Structural heart disease is defined by an anatomical or mechanical abnormality of the valves, muscle, chambers, septa, pericardium, or pulmonary circulation, whereas coronary artery disease is primarily a disease of blood supply to the myocardium. The two often coexist and can interact.

Is structural heart disease always present from birth?

No. It includes congenital malformations present from birth and a large group of acquired conditions, such as degenerative valve disease, cardiomyopathies, myocarditis, pericarditis, and pulmonary hypertension.

Structural Heart Disease

Structural heart disease is the group of cardiac conditions defined by an abnormality of the heart's anatomical structures — its valves, walls, chambers, muscle, or surrounding membrane — as distinct from disease of the coronary arteries or the conduction system alone. It spans congenital malformations present from birth and acquired conditions such as valvular lesions, cardiomyopathies, inflammatory disease of the myocardium and pericardium, and pulmonary vascular disease that loads the heart.

Definition

Structural heart disease denotes cardiac disorders whose primary lesion is anatomical or mechanical — affecting valves, the myocardium, the chambers and septa, the pericardium, or the pulmonary circulation — leading to abnormal flow, pressure, or filling rather than (or in addition to) ischaemic or purely electrical disease.

Scope

This area orients the reader to the major categories of structural heart disease covered as separate topics: acquired valvular disease, the cardiomyopathies, myocarditis and pericarditis, congenital heart disease, and pulmonary hypertension. It frames how each is defined, recognised, and classified, and how they relate to one another mechanically and clinically. It is a reference overview, not clinical guidance for any individual.

Sub-topics

Core questions

What anatomical structure is primarily abnormal, and is the lesion congenital or acquired?
How does the structural lesion alter pressure, volume load, or filling of the cardiac chambers?
How are these conditions classified and distinguished from coronary and primary electrical disease?

Key concepts

Valve stenosis and regurgitation
Pressure load versus volume load
Cardiomyopathy phenotypes (dilated, hypertrophic, restrictive)
Congenital shunts and obstructive lesions
Myocardial and pericardial inflammation
Pulmonary vascular resistance and right-heart load
Ventricular remodelling

Mechanisms

Across these conditions a structural lesion imposes an abnormal mechanical load or impairs filling, and the heart remodels in response. Valvular stenosis and many congenital obstructions impose a pressure load that drives concentric hypertrophy, whereas regurgitant valves and left-to-right shunts impose a volume load that drives chamber dilatation. Cardiomyopathies are intrinsic diseases of the heart muscle that present as dilated, hypertrophic, or restrictive phenotypes. Inflammation of the myocardium (myocarditis) or pericardium (pericarditis) can impair contraction or filling. Pulmonary hypertension raises the load on the right ventricle. The unifying theme is that altered structure changes the pressure-volume relationship of the chambers, with remodelling that is initially compensatory and later maladaptive.

Clinical relevance

Structural heart disease is a major source of heart failure, arrhythmia, and disability worldwide, and its recognition rests heavily on imaging, particularly echocardiography. Understanding the categories helps in reading the cardiology literature and appreciating how structural lesions translate into symptoms. This overview describes how the diseases are conceptualised and classified and is not a basis for individual diagnosis or treatment.

Epidemiology

The burden is large and varied. Population-based echocardiographic data show that moderate or severe valvular disease affects a substantial and age-rising share of adults (Nkomo, 2006). Congenital heart disease is the most common group of birth defects, and improved survival has produced a growing adult congenital population. Cardiomyopathies, inflammatory heart disease, and pulmonary hypertension each contribute meaningfully to heart-failure and sudden-death statistics.

History

The modern understanding of structural heart disease grew with cardiac auscultation and catheterisation in the nineteenth and twentieth centuries and was transformed by echocardiography, which made non-invasive assessment of valves, walls, and chambers routine. Contemporary classification and management are codified in society guidelines for valvular disease, cardiomyopathies, congenital heart disease, and pulmonary hypertension.

Seminal works

vahanian-2022
arbelo-2023
baumgartner-2021
nkomo-2006

Frequently asked questions

What distinguishes structural heart disease from coronary artery disease?: Structural heart disease is defined by an anatomical or mechanical abnormality of the valves, muscle, chambers, septa, pericardium, or pulmonary circulation, whereas coronary artery disease is primarily a disease of blood supply to the myocardium. The two often coexist and can interact.
Is structural heart disease always present from birth?: No. It includes congenital malformations present from birth and a large group of acquired conditions, such as degenerative valve disease, cardiomyopathies, myocarditis, pericarditis, and pulmonary hypertension.