Table 1 List of variables derived from the 24-h ambulatory electrocardiography and the respective definitions
Maximum, minimum, and mean heart rate during 24 h and for every hour |
Total number of episodes of bradycardia [minimum of four consecutive sinus beats at the rate of <45 beats per minute (BPM)] during 24 h and for every hour |
Total number of episodes of tachycardia (minimum of four consecutive sinus beats at the rate of >150 BPM) during 24 h and for every hour |
Total number of sinus pauses (defined as the absence of sinus P waves for more than 2 s) in 24 h and for every hour |
Total number of single atrial premature complexes (APCs) (defined as a premature normally appearing QRS complex with an abnormal P wave morphology) in 24 h and for every hour |
Total number of couplets (two consecutive) of APCs in 24 h and for every hour |
Total number of episodes of supraventricular tachycardia (SVT) (defined as an episode of ≥3 normally appearing QRS complexes with a rate of >150 BPM that commence with a complex of abnormal P wave morphology and whose N–N interval is equal to or less than the previous N–N interval) in 24 h and for every hour |
Total time of SVT during 24 h |
Total number of single ventricular premature complexes (VPCs) (defined as a premature complex with a bizarre and abnormally wide morphology and large T wave of opposite polarity) in 24 h and for every hour |
Total number of couplets of VPCs in 24 h and for every hour |
Total number of episodes of ventricular tachycardia (VT) (defined as an episode of ≥3 VPCs with at the rate of >100 BPM) in 24 h and for every hour |
Total number of VPCs in episodes of ventricular tachycardia in 24 h and for every hour |
Total time of VT in 24 h |
Total number of idioventricular episodes (defined as an episode of >3 VPCs at a rate of <100 BPM) in 24 h and for every hour |
Total number of idioventricular complexes (defined as a VPC at a rate of <100 BPM) in 24 h and for every hour |
Total number of ventricular depolarizations (defined as the sum of single and couplet VPCs, number of VPCs in episodes of VT, and number of complexes in episodes of IVR) in 24 h and for every hour |
Total number of episodes of “R-on-T phenomenon” (defined as an episode where a VPC interrupts the T wave of the preceding beat) in 24 h and for every hour |
Presence of second-degree AV block (defined as a P wave not conducting a QRS complex) |