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His research interests are also in three-dimensional mapping for localization and ablation of ventricular tachycardias . Digoxin has been shown to be beneficial for patients with supraventricular tachycardia or associated left ventricular dysfunction multifocal atrial tachycardia , but verapamil has been proven to be better than digoxin for controlling the heart rate . The presence of pallor on skin examination may indicate an anemia , which if severe might also be associated with a tachycardia . The antihypertensive effect of labetalol has a linear correlation with the logarithm of labetalol plasma concentration , and there is also a linear correlation between the reduction in exercise-induced tachycardia occurring at 2 hours after oral administration of labetalol HCl and the logarithm of the plasma concentration . There is also a small risk that supraventricular tachycardia will return , requiring a second procedure to correct the fast heart rate . The presence of pallor on skin examination may indicate an anemia which , if severe , might also be associated with a tachycardia . " Wolff-Parkinson-White ( WPW ) syndrome is a congenital abnormality involving the presence of abnormal conductive tissue between the atria and the ventricles that is often associated with supraventricular tachycardia ( SVT ) . Finally , some of the better-known primary and secondary prevention trials for treatment of ventricular tachycardias will be reviewed . He felt ill one day and went to a hospital where he was diagnosed with supraventricular tachycardia – his heart was beating abnormally fast . Inclusion criteria : randomised trials comparing adenosine and a calcium channel antagonist in patients of any age with supraventricular tachycardia , where one of the defined outcomes was reported . The diffusion impairment seen in the interstitial lung diseases , for example , will cause patients to develop further hypoxemia with a tachycardia or increasing hypoxemia with exercise as is commonly seen . Goldberg AS , Bathina MN , Mickelsen S , et al. Long-term outcomes on quality-of-life and health care costs in patients with supraventricular tachycardia ( radiofrequency catheter ablation versus medical therapy ) .