Palpitations: give your clinician a timeline, not just a heart-rate screenshot
About this article: AI-assisted, not independently clinically reviewed
Prepared with AI-assisted research using the sources below. Not independently reviewed by a clinician. Guidance and individual circumstances can change; use this article to prepare for a clinical conversation, not to choose treatment.
Sources checked 2026-09-05. Last updated 2026-09-05.
The short version
- Timing and associated symptoms can be more useful than one pulse number.
- A diary helps match symptoms to an ECG; it cannot diagnose the rhythm.
- The best monitor depends on how often symptoms happen and the clinical context.
'My heart was racing' describes an important experience, but it leaves several questions open. Did it start suddenly? Was it regular? Were you walking, lying down or waking from sleep? A short timeline can help a clinician choose the right investigation, particularly when an episode has ended before the appointment.
Start with the experience, not a diagnosis
Palpitations may feel like pounding, fluttering, skipped beats or an unusually fast or slow heartbeat. A sensation alone cannot identify the rhythm. Note what you actually felt rather than naming a condition you saw online. For example, 'sudden pounding for roughly two minutes while seated' is more useful than 'definitely AF'.
Evidence: NHLBI 2022: arrhythmia symptoms
Potential triggers include exertion, poor sleep, caffeine, alcohol, nicotine, stress and medicines. Other causes include anaemia, thyroid disease and arrhythmias. The presence of stress does not establish anxiety as the cause. Recurrent or worsening episodes, existing heart disease or a relevant family history deserve clinical assessment rather than a diary indefinitely replacing care.
A practical one-minute diary
- Time: the date, approximate start and end, and whether onset and recovery were sudden or gradual.
- Context: activity, posture, sleep or waking, plus recent caffeine, alcohol, illness or medication changes.
- Sensation: pounding, fluttering, skipping, regular racing or something difficult to describe. Your own words are acceptable.
- Associated symptoms: chest discomfort, breathlessness, dizziness, faintness or loss of consciousness, including their timing.
- Evidence: an original ECG recording if safely available. A pulse measurement is optional; note the device and avoid treating its number as a rhythm diagnosis.
Evidence: NHLBI 2022: arrhythmia symptoms · ISHNE-HRS 2017: ambulatory ECG monitoring consensus, section 4.2
You do not need perfect precision. Write 'approximately five minutes' rather than inventing exact times. If someone witnessed the episode, their observation may add useful context. A manageable record that captures the main events is generally easier to review than pages of measurements without a clear symptom timeline.
Why a normal short ECG may not finish the investigation
An ECG records electrical activity during its recording window. If symptoms are intermittent, a brief test between episodes may not capture their cause. Assessment can combine history, examination, ECG and selected blood tests, with longer monitoring when indicated. The diary helps link a sensation to what the heart was doing at that moment; it does not replace that electrical evidence.
Evidence: NHLBI 2022: diagnosing arrhythmias
Match the monitor to the question
The ISHNE-HRS consensus describes 24 to 48-hour Holter monitoring as useful for daily or reliably reproducible symptoms. Less frequent, unpredictable events may need a longer external event or loop monitor. Some devices require you to activate a recording when symptoms occur. The choice also depends on clinical risk, usability and the information needed, not just the number of days available.
Evidence: ISHNE-HRS 2017: ambulatory ECG monitoring consensus, section 4.2
An implantable loop recorder is different: it is placed under the skin and is not simply another wearable patch. Not everyone with palpitations needs one. Ask how to use the prescribed device, how to mark symptoms, what to do if it detaches and who will explain the result. Do not deliberately provoke concerning exertional symptoms to make a monitor capture them.
Evidence: NHLBI 2022: diagnosing arrhythmias · ISHNE-HRS 2017: ambulatory ECG monitoring consensus, section 4.2
When recording must stop and care must start
Palpitations with chest pain, shortness of breath, faintness or fainting need emergency assessment. If such symptoms have stopped, seek urgent clinical advice rather than waiting for another episode to prove they happened. Use your local emergency number for ongoing severe symptoms. Do not drive yourself if you feel faint or seriously unwell.
For a routine review, bring one concise summary: how often it happens, the longest episode, the most concerning associated symptom and the original recordings. Ask what would make the situation urgent and when to follow up if the first test is unrevealing. That turns a collection of observations into a useful clinical conversation.
This article is educational and is not medical advice, a diagnosis, or a treatment recommendation. CardioTrack is not intended for diagnosis or treatment. Always discuss your own results with a qualified clinician.