I have symptoms of shortness of breath, heart attack when exercising vigorously. When I'm stressed and tired, I often have heart pressure, making it difficult to breathe. So, shortness of breath with chest tightness is a symptom of what disease?

I often have heart palpitations, before it was rare and difficult to recognize. However, recently, the frequency of heart palpitations occurs continuously and I can feel it clearly. Several times when I went to the doctor, the doctor said that I had a fast heart rate. I want to ask the doctor if tachycardia is dangerous?

Doppler ultrasound is one of the most valuable diagnostic tools, especially in heart and blood vessel diseases. However, to analyze images accurately and effectively, understanding the principles of Doppler ultrasound also plays an extremely important role.