Ventricular preexcitation is the presence of another channel between the atria and the ventricles that causes the excitation of the atria to pass down through this abnormal channel before it can pass down through the AV node to the ventricles, causing premature excitation of the ventricular muscle. type B ventricular preexcitation is when this channel is located on the right side of the heart and is called the right bypass. type B ventricular preexcitation causes symptoms such as panic, palpitations, shortness of breath, and dizziness that occur during episodes of supraventricular tachycardia, but sometimes after intense coughing, vomiting, or breath-holding, these symptoms suddenly disappear and the heart rate returns to normal. When no arrhythmia is present, type B ventricular pre-excitation can also be asymptomatic and normal, except that abnormalities will be detected when an electrocardiogram is performed.