Harvard Heart Letter

New nasal spray may stop rapid heart rhythm

Research we’re watching An experimental nasal spray shows promise for quickly treating an abnormally fast heart rhythm known as supraventricular tachycardia (SVT), a new study reports. Caused by an electrical misfire that overrides the heart’s natural pacemaker, SVT occurs unpredictably, lasting anywhere from minutes to hours. Although usually harmless, the condition can make people dizzy or lightheaded. People with persistent SVT usually need to go to an emergency room for an injection of…

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