Introduction
Methods
The Danish research setting
Information in the Danish Nationwide ECG Cohort
Acquisition, processing, and analysis of ECG data
Variable name | Description | Unit |
---|---|---|
PatientID | Pseudonymized CPR number | |
Location | Region codes to identify in which Danish region/hospital department the ECG was acquired | |
Acq_Date | Date of ECG recording | |
Acq_Time | Time of ECG recording | |
AnalysisSoftwareVersion | Marquette 12SL algorithm version 23 | |
ECGSampleBase | ECG sampling rate | |
NumQRSComplexes | Total number of QRS complexes in the ECG | |
Statements | Diagnostic statements generated by the Marquette 12SL algorithm version 23 | |
Global ECG measurements | ||
AvgRRInterval | Average R-R interval | ms |
VentricularRate | Heart rate | bpm |
AtrialRate | Atrial heart rate | bpm |
PR_Interval | PR interval | ms |
QRSDuration | QRS duration | ms |
QT_Interval | QT interval | ms |
QTcBazett | QT interval corrected based on the Bazett formula | ms |
QTcFridericia | QT interval corrected based on the Fridericia formula | ms |
QTcFramingham | QT interval corrected based on the Framingham formula | ms |
P_Frontal_Axis | P-wave axis frontal plane | degrees |
R_Frontal_Axis | R-wave axis frontal plane | degrees |
T_Frontal_Axis | T-wave axis frontal plane | degrees |
QOnset | Q-wave onset | sample # |
QOffset | Q-wave offset | sample # |
POnset | P-wave onset | sample # |
POffset | P-wave offset | sample # |
TOffset | T-wave onset | sample # |
Lead-specific ECG measurements | ||
P_OnsetAmpl_X | P-wave onset amplitude in lead X | µV |
P_PeakAmpl_X | P-wave peak amplitude in lead X | µV |
P_Duration_X | P-wave duration in lead X | ms |
P_Area_X | P-wave area in lead X | µV⋅ms |
P_PeakTime_X | P-wave peak time (from POnset) in lead X | ms |
PP_PeakAmpl_X | P′-wave peak amplitude in lead X | µV |
PP_Duration_X | P′-wave duration in lead X | ms |
PP_Area_X | P′-wave area in lead X | µV⋅ms |
PP_PeakTime_X | P′-wave peak time (from P′Onset) in lead X | ms |
Q_PeakAmpl_X | Q-wave peak amplitude in lead X | µV |
Q_Duration_X | Q-wave duration in lead X | ms |
Q_Area_X | Q-wave area in lead X | µV⋅ms |
Q_PeakTime_X | Q-wave peak time (from QOnset) in lead X | ms |
R_PeakAmpl_X | R-wave peak amplitude in lead X | µV |
R_Duration_X | R-wave duration in lead X | ms |
R_Area_X | R-wave area in lead X | µV⋅ms |
R_PeakTime_X | R-wave peak time (from ROnset) in lead X | ms |
S_PeakAmpl_X | S-wave peak amplitude in lead X | µV |
S_Duration_X | S-wave duration in lead X | ms |
S_Area_X | S-wave area in lead X | µV⋅ms |
S_PeakTime_X | S-wave peak time (from SOnset) in lead X | ms |
RP_PeakAmpl_X | R′-wave peak amplitude in lead X | µV |
RP_Duration_X | R′-wave duration in lead X | ms |
RP_Area_X | R′-wave area in lead X | µV⋅ms |
RP_PeakTime_X | R′-wave peak time (from R′Onset) in lead X | ms |
SP_PeakAmpl_X | S′-wave peak amplitude in lead X | µV |
SP_Duration_X | S′-wave duration in lead X | ms |
SP_Area_X | S′-wave area in lead X | µV⋅ms |
SP_PeakTime_X | S′-wave peak time (from S′Onset) in lead X | ms |
STJ_X | ST-segment level at the J point of the terminal QRS complex in lead X | µV |
STM_X | ST-segment level at the QRS offset plus 1/16 of the average RR interval in lead X | µV |
STE_X | ST-segment level at the QRS offset plus 1/8 of the average RR interval in lead X | µV |
MaxST_X | Maximum of STJ_X, STM_X, and STE_X in lead X | µV |
MinST_X | Minimum of STJ_X, STM_X, and STE_X in lead X | µV |
T_Special_X | Minimum of either T-wave amplitude or (T-wave amplitude - STE_X) in lead X | µV |
QRS_Balance_X | Maximum R-wave amplitude - maximum S-wave amplitude in lead X | µV |
QRS_Deflection_X | QRS peak-to-peak amplitude in lead X (R_Amp_X - S_Amp_X) | µV |
Max_R_Ampl_X | Maximum of the R-wave or R′-wave in lead X | µV |
Max_S_Ampl_X | Maximum of the Q-wave, S-wave, or S′-wave in lead X | µV |
T_PeakAmpl_X | T-wave peak amplitude in lead X | µV |
T_Duration_X | T-wave duration in lead X | ms |
T_Area_X | T-wave area in lead X | µV⋅ms |
T_PeakTime_X | T-wave peak time (from TOnset) in lead X | ms |
TP_PeakAmpl_X | T′-wave peak amplitude in lead X | µV |
TP_Duration_X | T′-wave duration in lead X | ms |
TP_Area_X | T′-wave area in lead X | µV⋅ms |
TP_PeakTime_X | T′-wave peak time (from T′Onset) in lead X | ms |
T_EndAmpl_X | T-wave offset amplitude in lead X | µV |
PFull_Area_X | Sum of P-wave and P′-wave areas in lead X | µV⋅ms |
QRS_Area_X | QRS area in lead X | µV⋅ms |
TFull_Area_X | Sum of T-wave and T′-wave areas in lead X | µV⋅ms |