Why are the ECG manifestations of borderline premature beats?

Patient's question:

I just had an ectopic premature beat ECG done at the hospital last week, and I don't know the results yet. Hello, why does the ectopic premature beat ECG show this?

Doctor's answer:

Under normal circumstances, junctional premature beats, as shown on an electrocardiogram, primarily manifest as the premature appearance of the initial P wave, leading to a widened PR interval and a shortened P2 wave, among other clinical manifestations. In daily life, junctional premature beats may be accompanied by symptoms such as palpitations, chest tightness, dizziness, or limb weakness. During clinical diagnosis and treatment, oral medications such as Qingwen Granules or Propranolol Tablets can be administered to manage the condition.

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