| Haemophilia | Pathological bleeding tendency |
|---|---|
| Main artery | Blood vessel that transports blood into the body, where it supplies tissues and organs with oxygen and other substances and removes carbon dioxide in exchange; in a healthy heart it originates from the left ventricle |
| Heart echo | see echocardiography |
| Heart failure | can occur acutely or chronically and is characterised by the inability of the heart to eject or receive blood |
| Cardiac catheter | Technique in which structures of the heart can be visualised using X-rays and contrast medium, and certain heart defects can be treated with suitable equipment |
| Coronary vessel | Blood vessel that supplies blood to the heart muscle; originates from the aorta in healthy people |
| Pacemaker | Implantable device that takes over the rhythm of the heart action or supports the heart in its electrical activity |
| Cardiac output | Amount of blood that the heart is able to pump in a given time; usually given in litres per minute [l/min] |
| HLHS | Hypoplastic left heart syndrome; see there |
| HLM | Heart-lung machine; |
| Vena cava | Blood vessel that collects deoxygenated or carbon dioxide-rich blood from the body and transports it to the right atrium; a distinction is made between the superior and inferior vena cava in healthy people |
| Holter ECG | See long-term ECG |
| Homograft | Heart valve replacement from human tissue |
| HRHS | Hypoplastic right heart syndrome; see there |
| Hypertension | High blood pressure |
| Hypertrophy | Tissue thickening |
| Hypoplastic left heart syndrome | Group of congenital heart defects, primarily characterised by underdeveloped left-sided sections of the heart (left ventricle, left atrium, aorta) |
| Hypoplastic right heart syndrome | Group of congenital heart defects, primarily characterised by underdeveloped right-sided sections of the heart (right ventricle, right atrium, pulmonary artery) |
| HZV | Cardiac output |
| Hybrid intervention | Combination of a cardiac catheterisation procedure with heart surgery |