A31-year-old woman with a congenital heart defect reports episodes of lightheadedness and syncope, with occasional palpitations. a resting ecg reveals sinus bradycardia, and she is suspected to have sick sinus syndrome. which diagnostic method is the best choice to investigate the suspicion?

Holter monitoring

Explanation:

A Holter monitor is referred to as or known as a small medical device which powered by a battery that tends to measures an individuals heart activity, example rhythm and rate. In this the doctor might ask an individual to use the device if they tend to need more data and information regarding their heart function.

question - in 1827, john walker, a druggist in a small english town, tipped a splint with sulphur, chlorate of potash, and sulphid of antimony, and rubbed it on sandpaper, and it burst into flame. the druggist had discovered the first friction-chemical match, the kind we use to-day. it is called friction-chemical because it is made by mixing certain chemicals together and rubbing them. although walker's match did not require the bottle of acid, nevertheless it was not a good one. it could be lighted only by hard rubbing, and it sputtered and threw fire in all directions. in a few years, however, phosphorus was substituted on the tip for antimony, and the change worked wonders. the match could now be lighted with very little rubbing, and it was no longer necessary to have sandpaper upon which to rub it. it would ignite when rubbed on any dry surface, and there was no longer any sputtering. this was the phosphorus match, the match with which we are so familiar. according the paragraph what was the benefit of the new phosphorus match? it burst into flame when rubbed on sandpaper. it was made by mixing chemicals. it could be ignited on any dry surface. it threw fire in all directions.

answer - matches required natural chemicals

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