Heart rate variability (HRV, Heart Rate Variability) refers to the small variations in the time interval between each heartbeat. In simple terms, the heart does not beat like a metronome, with one fixed beat every second. Even if your heart rate is 60 beats per minute, the interval between two heartbeats may be 0.98 seconds, 1.03 seconds, 0.95 seconds, and so on. These variations are what we call heart rate variability. How is it measured? These variations are very small and

Mr. Li (pseudonym), 47 years old, experienced chest pain and dizziness two months ago. After being diagnosed with coronary heart disease, he underwent angioplasty and stent placement surgery. After the surgery, the dizziness was more severe than before the surgery, his resting heart rate reached 90-100 beats per minute, he had palpitations, and his mood became easily tense and depressed. He rushed to the clinic for treatment. Why do some patients experience more discomfort af

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