Ectopic beats are a type of cardiac arrhythmias, which is a variety of cardiac abnormalities relating to rate or rhythm of the cardiac cycle.Ectopic beats may become more frequent during anxiety, panic attack, and the fight-or-flight response due to the increase in sympathetic nervous activity or due to parasympathetic failure, stimulating either more frequent or more vigorous contractions and increasing stroke volume. The consumption of nicotine, alcohol, epinephrine and caffeine may also increase the incidence of ectopic beats, due to their influence on the action of cardiomyocytes. See also
Heart arrhythmia § Origin of impulse
Ectopia (disambiguation)
Junctional escape beat
Palpitation
Premature junctional contraction
Ventricular escape beat

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== External links ==
EANM guidelines, endorsed by the SNMMI, suggest a variety of regimes in clinical use, for both children and adults.Product labeling for diagnostic 131I iobenguane recommends giving potassium iodide one day before injection and continuing 5 to 7 days following. 131I iobenguane used for therapeutic purposes requires a different pre-medication duration, beginning 24–48 hours before iobenguane injection and continuing 10–15 days after injection. Clinical trials
Iobenguane I 131 for cancers
Iobenguane I 131, marketed under the trade name Azedra, has had a clinical trial as a treatment for malignant, recurrent or unresectable pheochromocytoma and paraganglioma, and the FDA approved it on July 30, 2018. The drug is developed by Progenics Pharmaceuticals. References
External links
"Iobenguane". Drug Information Portal. U.S. National Library of Medicine. "Iobenguane I 131". Drug Information Portal. U.S. National Library of Medicine. "Iobenguane I 123". Drug Information Portal. U.S. National Library of Medicine. "iobenguane I 131". NCI Drug Dictionary. "Iobenguane I 131". National Cancer Institute. 15 August 2018.