PTB-XL

PTB-XL ECG Database

Clinical & physiological

A large publicly available electrocardiography dataset of 21,799 clinical 12-lead ECG records from 18,869 patients, each annotated with diagnostic statements following the SCP-ECG standard.

PTB / PhysioNetOfficial source

Record metadata fields

Each PTB-XL record is a 12-lead clinical ECG described by the following metadata fields, grouped by category.

Field	Group	Description
ecg_id	Identifiers	Unique identifier for the ECG record.
patient_id	Identifiers	De-identified patient identifier (recurs across a patient’s ECGs).
age	Demographics	Patient age in years (values of 300 denote anonymized ages > 89).
sex	Demographics	Patient sex (0 = male, 1 = female).
height	Demographics	Height in cm (often unrecorded).
weight	Demographics	Weight in kg (often unrecorded).
recording_date	Recording	Timestamp the ECG was recorded.
device	Recording	Recording device / cart model (e.g. CS-12, AT-6 C).
sampling_rate_hr / _lr	Recording	High- (500 Hz) and low- (100 Hz) resolution sampling rates.
filename_hr / _lr	Recording	Paths to the high- and low-resolution WFDB signal files.
report	Diagnosis	Free-text cardiologist report (original language).
scp_codes	Diagnosis	SCP-ECG statement codes mapped to likelihoods (0–100).
scp_descriptions	Diagnosis	Human-readable description of each SCP-ECG code.
heart_axis	Diagnosis	Cardiac electrical axis (e.g. LAD, RAD, MID).
infarction_stadium1 / 2	Diagnosis	Staging of any myocardial infarction findings.
validated_by_human	Validation	Whether a human cardiologist validated the record.
validated_by	Validation	Identifier of the validating cardiologist (nullable).
second_opinion	Validation	Whether a second opinion was obtained.
quality	Signal quality	Noise flags: baseline drift, static/burst noise, electrode problems, extra beats, pacemaker.
strat_fold	Splits	Recommended stratified fold (1–10) for train/test splitting.
nurse / site	Provenance	Recording nurse and collection site identifiers.

Example record

A worked example showing the values for one PTB-XL clinical ECG record.

ECG ID

Patient ID

15709

Sampling (HR / LR)

500 / 100 Hz

Device

CS-12 E

Strat fold

Patient

Age56

SexFemale

HeightNot recorded

Weight63 kg

Recording date1984-11-09 09:17:34

ValidationHuman-validated

Cardiologist report

“sinusrhythmus periphere niederspannung”

SCP-ECG diagnostic statements

Code	Description	Likelihood
`NORM`	normal ECG	100%
`LVOLT`	low QRS voltages in the frontal and horizontal leads	—
`SR`	sinus rhythm	—

Signal quality

Baseline DriftClean

Static Noise, I-V1,

Burst NoiseClean

Electrodes ProblemsClean

Extra BeatsClean

PacemakerClean

Sample records

A handful of records illustrating the variety of diagnoses across the database.

ECG ID	Patient	Age	Sex	Diagnosis (SCP)	Axis	Fold	Device
#1	15709	56	Female	NORM · LVOLT · SR	—	3	CS-12 E
#2	13243	19	Male	NORM · SBRAD	—	2	CS-12 E
#7	16193	54	Male	NORM · SR	LAD	7	CS-12 E
#8	11275	48	Male	IMI · ABQRS · SR	LAD	9	CS-12 E
#17	13619	56	Male	AFLT · ABQRS · AFIB	ALAD	9	CS-12 E
#144	16914	81	Male	PACE	—	9	AT-6 C

Sex is encoded 0 = male, 1 = female. Diagnosis codes follow the SCP-ECG standard.