supraven­tric­u­lar tachy­car­dia

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1 FALSE SVT is an ab­nor­mally fast heart rate of over 100 beats per min. Episodes can last sec­onds, min­utes, hours – or even days, in rare cases.

2 True Any­one, of any age, can have SVT, which of­ten ap­pears for the first time in chil­dren or young adults. It’s caused by a prob­lem with the heart’s elec­tri­cal sys­tem.

3 True As well as dizzi­ness, it may cause chest pain, fa­tigue light­head­ed­ness, breath­less­ness – and, in rare cases, faint­ing.

4 FALSE Most episodes are harm­less, short and need no treat­ment. It’s rarely life-threat­en­ing, but breathing tech­niques and med­i­ca­tion can help pre­vent on-go­ing episodes.

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