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  2. Long QT syndrome - Wikipedia

    en.wikipedia.org/wiki/Long_QT_syndrome

    Long QT syndrome (LQTS) is a condition affecting repolarization (relaxing) of the heart after a heartbeat, giving rise to an abnormally lengthy QT interval. [7] It results in an increased risk of an irregular heartbeat which can result in fainting, drowning, seizures, or sudden death. [1]

  3. Sinus bradycardia - Wikipedia

    en.wikipedia.org/wiki/Sinus_bradycardia

    Sinus bradycardia is a common condition found in both healthy individuals and those who are considered well-conditioned athletes. [5] Heart rates considered bradycardic vary by species; for example, in the house cat, a rate of under 120 beats per minute is abnormal. Generally, smaller species have higher and larger species lower rates. [6]

  4. Electrocardiography - Wikipedia

    en.wikipedia.org/wiki/Electrocardiography

    Electrocardiography is the process of producing an electrocardiogram (ECG or EKG [a]), a recording of the heart's electrical activity through repeated cardiac cycles. [4] It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart [5] using electrodes placed on the skin.

  5. QT interval - Wikipedia

    en.wikipedia.org/wiki/QT_interval

    The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart.It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.

  6. Arrhythmia - Wikipedia

    en.wikipedia.org/wiki/Arrhythmia

    The resting heart rate in children is much faster. In athletes, however, the resting heart rate can be as slow as 40 beats per minute, and be considered normal. [citation needed] The term sinus arrhythmia [26] refers to a normal phenomenon of alternating mild acceleration and slowing of the heart rate that occurs with breathing in and out ...

  7. Premature ventricular contraction - Wikipedia

    en.wikipedia.org/wiki/Premature_ventricular...

    PVCs may be found incidentally on cardiac tests such as a 12-lead electrocardiogram (ECG/EKG) performed for another reason. In those with symptoms suggestive of premature ventricular complexes, the ECG/EKG is the first investigation that may identify PVCs as well as other cardiac rhythm issues that may cause similar symptoms.

  8. Brugada syndrome - Wikipedia

    en.wikipedia.org/wiki/Brugada_syndrome

    Those who show more than one cardiac conditions at the same time caused by a single mutation are described as having an 'overlap syndrome'. An example of an overlap syndrome is Brugada and long QT syndrome (LQT3) caused by a mutation in SCN5A that reduces the peak sodium current but simultaneously leaves a persistent current leak. [ 8 ]

  9. Bradycardia - Wikipedia

    en.wikipedia.org/wiki/Bradycardia

    Bradycardia, also called bradyarrhythmia, is a resting heart rate under 60 beats per minute (BPM). [1] While bradycardia can result from various pathologic processes, it is commonly a physiologic response to cardiovascular conditioning or due to asymptomatic type 1 atrioventricular block.