Thanks for your question on Health Care Magic. I can understand your concern. Strained heart means, your heart is not functioning normally. It is working under strain (pressure). And most common cause for this this is undiagnosed and uncontrolled hypertension. You are also having high blood pressure. So this is the cause for you Strained heart. And this is the reason for you symptoms like palpitations, heavy breathing etc. If not improving treated promptly, this can lead to heart failure. So better to start treatment of high blood pressure. Strict salt restriction in diet and exercise are also needed to control blood pressure.. Don t worry, you will be alright. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.