In several heart conditions, particularly long QT syndrome and Brugada syndrome, certain medicines or drugs can cause problems and trigger dangerous heart rhythms. These should therefore be avoided. Unfortunately, sale there is a rather long list of these! However a compressive list is available on-line, which is regularly updated: For long QT syndrome: http://www.sads.org.uk/drugs-to-avoid Members with […]
In the western world it affects mainly young and middle-aged adult men. It has been associated with mutations in the same sodium channel that is affected in long QT syndrome, but this appears to account for only 1 in every 5 people with the condition. The sodium channel behaves abnormally in that movement of sodium ions into the cells is restricted. This results in particular changes on the ECG but no abnormalities in the structure of the heart. Other genes have been described as being involved in Brugada syndrome that produce calcium ion channels and a protein in the cell surface (membrane) that interacts with the sodium channel. They have, however, only been detected in a small number of carriers.
Catecholaminergic polymorphic ventricular tachycardia (CPVT) is a rare condition that has been associated with two genes that make proteins found inside the cell – the human ryanodine receptor (a calcium ion channel) and calsequestrin (a protein that interacts with the calcium channel). These regulate the release of calcium ions into the rest of the cell. […]
Long QT syndrome (LQTS) is an ion channelopathy. Ion channelopathies (also sometimes referred to as arrhythmia syndromes or cardiac channelopathies)affect the electrical functioning of the heart without affecting the heart’s structure. They are a group of rare genetic conditions that are caused by abnormalities of the DNA known as mutations. They are usually inherited from parents although they can occur for the first time in a person. (If they occur for the first time they are described as sporadic.)