This report is describing the heart's electrical activity based on a test called an ECG (electrocardiogram). Here’s a simpler breakdown:
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Underlying sinus rhythm: This means the heart is beating in a normal way, starting from the sinus node (the heart's natural pacemaker).
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Rates from 52 to 113 bpm: The heart rate has been recorded between 52 and 113 beats per minute. "BPM" stands for beats per minute, which is how we measure heart rate.
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Rare PAC's noted: PAC stands for Premature Atrial Contractions, which are extra beats that start in the upper chambers of the heart. “Rare” means these happened infrequently.
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No pairs and 34 runs the longest 6 beats at 130 bpm: In the PACs, there were no two extra beats happening back-to-back (no "pairs"). The longest "run" of extra beats lasted for 6 beats and had a heart rate of 130 beats per minute.
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The fastest 4 beats at 143 bpm: At one point, there were 4 fast beats in a row, with a heart rate of 143 beats per minute.
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Rare PVC's noted: PVC stands for Premature Ventricular Contractions, which are extra beats that start in the lower chambers of the heart. Like the PACs, these also happened infrequently.
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One run of 7 beats at 125 bpm: There was one instance where these extra beats lasted for 7 beats at a heart rate of 125 beats per minute.
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The patient recorded one diary event, the rhythm was sinus: This means the patient kept a log of their heart’s rhythm at some point, and it showed that the heart was beating normally.
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Non-sustained Ventricular tachycardia is noted: This means there was a short episode of rapid heartbeats that started in the lower chambers but didn't last too long. “Non-sustained” means it stopped on its own.
In summary, the heart is mainly beating normally, but there are occasional extra beats and some episodes of rapid heart rates that are not lasting long. It's something that a doctor would want to keep an eye on, but it doesn't necessarily mean there is a serious problem.