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  2. 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.

  3. Heart rate variability - Wikipedia

    en.wikipedia.org/wiki/Heart_rate_variability

    SDNN is Standard Deviation of Normal-to-Normal interbeat intervals measured in milliseconds. RMSSD is Root Mean Square of Successive Differences between normal heartbeats measured in milliseconds. [ 89 ] [ 1 ] The conventional recording time is five minutes.

  4. Heart rate - Wikipedia

    en.wikipedia.org/wiki/Heart_rate

    Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (beats per minute, or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and excrete carbon dioxide .

  5. Interbeat interval - Wikipedia

    en.wikipedia.org/wiki/Interbeat_interval

    IBI is generally measured in units of milliseconds. In normal heart function, each IBI value varies from beat to beat. This natural variation is known as heart rate variability (HRV). However, certain cardiac conditions may cause the individual IBI values to become nearly constant, resulting in the HRV being nearly zero.

  6. PR interval - Wikipedia

    en.wikipedia.org/wiki/PR_interval

    Schematic representation of a normal sinus rhythm EKG wave. In electrocardiography, the PR interval is the period, measured in milliseconds, that extends from the beginning of the P wave (the onset of atrial depolarization) until the beginning of the QRS complex (the onset of ventricular depolarization); it is normally between 120 and 200 ms in duration.

  7. Millisecond - Wikipedia

    en.wikipedia.org/wiki/Millisecond

    15.625 milliseconds – a two hundred fifty-sixth note at 60 BPM 16.67 milliseconds (1/60 second) – a third , cycle time for American 60 Hz AC electricity (mains grid) 16.68 milliseconds (1/59.94 second) – the amount of time one field lasts in 29.97 fps interlaced video (commonly erroneously referred to as 30 fps)

  8. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    60 bpm, common tempo in music 2 Hz: 120 bpm, common tempo in music ~7.83 Hz: Fundamental frequency of the Schumann resonances: 10 1: 10 hertz 10 Hz: Cyclic rate of a typical automobile engine at idle (equivalent to 600 rpm) 12 Hz: Acoustic – the lowest possible frequency that a human can hear [3] 18 Hz: Average house cat's purr 24 Hz

  9. 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]