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The first line treatment for CPVT is beta-blockers, which block the beta-receptors and prevent adrenaline from asserting its effect on the heart. Ventricular arrhythmias typically start at heart rates of 110-120 beats per minute. Beta-blockers also limit the maximum heart rate during exercise. Reports of large numbers of patients with CPVT suggest that nadolol is the optimal beta-blocker, due to its broad effect against diferente beta-receptors and long duration of action.
A newer addition to the medical therapy for CPVT is flecainide. The predominant effect appears to be by affecting sodium and calcium exchange within the cardiac cell. This can be very effective in some patients but not all.
For patients considered high risk, or those that continue to have symptoms of ventricular arrhythmias despite other therapies, implantable cardioverter defibrillators can be used. These detect ventricular arrhythmias and treat them by administering a shock to restore normal cardiac rhythm. However, due to numerous side effects — especially in patients with CPVT — these are used only in carefully selected cases.
Like many inherited heart disorders, the management of CPVT requires psychological input and counseling to help patients understand their condition and the different treatment strategies. This is a key component to the care of patients with CPVT within our clinic.
The effect of a medication can be assessed with exercise testing or Holter monitoring to determine the degree of ventricular ectopy and arrhythmias. Implantable loop recorders placed just under the skin on the chest wall constantly record every heartbeat and transmit any abnormal rhythms to the Boston Children’s Heart Center electronically. These small devices, which can be implanted in 10-15 minutes, are increasingly used for CPVT patients.
A more invasive alternative is a procedure called left cardiac sympathetic denervation (or sympathectomy). In this 45-minute surgical procedure, a surgeon divides the nerves going into the heart (called the sympathetic chain) using a thoracoscopic keyhole approach through the chest wall. The sympathetic nerves supply adrenaline to the heart. Therefore, interrupting this chain can prevent adrenaline’s stimulation of the heart, which causes arrhythmias. A recent multi-center, international study (which the Heart Center was a part of) showed this can be a very effective therapy in preventing arrhythmias.
We are grateful to have been ranked #1 on U.S. News & World Report's list of the best children's hospitals in the nation for the third year in a row, an honor we could not have achieved without the patients and families who inspire us to do our very best for them. Thanks to you, Boston Children's is a place where we can write the greatest children's stories ever told.”