An<unk>  is an additional electrical connection between two parts of the heart. These<unk> s can lead to abnormal heart rhythms or arrhythmias associated with symptoms of palpitations. Some<unk> s may activate a region of ventricular muscle earlier than would normally occur, referred to as pre-excitation, and this may be seen on an electrocardiogram. The combination of an<unk>  that causes pre-excitation with arrhythmias is known as Wolff-Parkinson-White syndrome.<unk> s are often diagnosed using an electrocardiogram, but characterisation and location of the<unk>  may require an electrophysiological study.<unk> s may not require any treatment, but those causing symptoms may be treated with medication including calcium channel antagonists, beta blockers or flecainide. Alternatively, the electrical conduction through an<unk> s can be abolished using catheter ablation, potentially offering a permanent cure. __TOC__
Accessory pathway
Perforant path
Emasculation
Subluxation
Electromagnetic hypersensitivity
Solvent drag
Contracture
Quatrefoil reentry