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Terminology in Cardiology - H

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Heart Attack: - (myocardial infarction) is the sudden interruption or insufficiency of the supply of blood to the heart, typically resulting from occlusion or obstruction of a coronary artery and often characterized by severe chest pain.

Heart Block: - impaired conduction of the impulse that regulates the HB – may cause sudden attacks of unconsciousness.

 Heart-lung Machine: - a machine that pumps and oxygenates blood during open-heart surgery.

Heart rate: - number of QRS complexes on an electrocardiogram – note this may not be the same as the pulse rate.

Heart Valve Prolapse: - a condition of the heart valve in which it is partially open when it should be closed.

His-Purkinje system: - the electrical network of fibres which includes the Bundle of His, bundle branches and Purkinje fibres.

Hyperkalaemia: - increased potassium levels in the blood.

Hypertension: - high blood pressure = diastolic more than 90 mmHg and systolic more than140 mmHg.

Hypokalaemia: - decreased potassium levels in the blood.

Hypotension: - low blood pressure = diastolic less than 70mg systolic less than 90 mmHg.

Hypoxia: - a sub therapeutic blood oxygen level resulting in reduced energy production and level of lactic and pyuvic acid (anaerobic metabolism).

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