My wife's elevated heart rate persists for more than a day. Please help.

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It is PSVT (paroxysmal supraventricular tachycardia). It is an abnormal form of heart rate elevation (arrhythmia). This can be problematic if her heart rate remains elevated for a long time. This can be an age-related problem. However, the possibility of structural heart disease or ischemic heart disease should be ruled out on echo and may need a stress test or CT coronary angiography. This can be intermittent and go sometimes, but she should be on long term treatment for this problem and undergo echo. She will need to be on medications like Metoprolol or Diltiazem. Now you should take her to the hospital for its suppression and have medications prescribed. At home, to suppress it, she should do coughing, put some cold water in the face. If not helping, then take her to the hospital for IV medications. To prevent subsequent episodes, she should be on long term medications, and you should also request for medications like Diltiazem to be taken at home whenever it recurs.

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All right, you should buy a tablet of Diltiazem 30 mg and keep it with you for emergency purposes. But give it only if her BP (blood pressure) is more than 110 mmHg systolic. So you need to have a BP machine with you at home. Initially, try those measures like cough and cold water. After a local doctor has auscultated her neck (and if it is normal), you may learn to do neck massage (carotid sinus massage) to suppress these.

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Her echo shows concentric left ventricular hypertrophy and mild AR (which is probably an age-related issue). Concentric LVH (left ventricular hypertrophy) is usually related to high BP. So she needs to monitor her BP regularly and have medicine for it if it is remaining on a higher side. The same BP medicines like Metoprolol or Diltiazem will help control both BP and SVT (supraventricular tachycardia). So get her checked by a local doctor and get cardiac medications prescribed. Regarding thyroid, she will need to start thyroxine supplements like tablet Eltroxin 25 ug 30 minutes before breakfast once daily. She will need to test the TSH level again at six weeks to see whether it is controlled or not. As I mentioned earlier, she will need to undergo some stress test like a treadmill test or CT coronary angiography (it is better to show even minor blockages) to rule out the possibility of blockages. Normal echoes reliably do not rule out the same.