Cardiac arrhythmias The causes of abnormal heart rhythms are a focus of intense research. A number of types of cardiac arrhythmias have been identified and many effective treatments are now in place. By Dr Puneet Kakar and Professor Gregory YH Lip Sign in to continue Sign In Email address Password Stay signed in Trouble signing in? Reset password: Click here Need help? Email us Register FREE Limited free articles a month Free email bulletins Register Now Subscribe now Benefits include: Full site access Subscriber exclusive content Exclusive bulletins Choose a package