# SHDB-AF: a Japanese Holter ECG database of atrial fibrillation


Latest version: 1.0.1.

containing data from 127 unique patients with paroxysmal atrial fibrillation. Among the 128 recordings, 98 contain raw ECG data with rhythm annotations at the beat level, manually performed by a cardiology fellow. The remaining recordings consist only of ECG traces without annotations.

Rhythm annotations contains categorize rhythms into five types:

- (AFIB (atrial fibrillation);
- (AFL (atrial flutter);
- (AT (atrial tachycardia);
- (PAT (Other supraventricular tachycardias such as Wolf-Parkinson-White) and (NOD (intranodal tachycardias); and
- (N (other, such as NSR, that were not labeled).

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## Content:

ECG files (with the suffix .dat) contains two channel ECG (denoted as 'ECG1' and 'ECG2'), year of recording (under 'base_year') and the relative starting time of recording during the day (under ‘base_time’ field).
The rhythm annotation files are denoted with the suffix .atr .
The R-peaks annotations were automatically detected using epltd algorithm and are located in the files with the suffix .qrs .

Additionally, the AdditionalData.csv file details the clinical and demographic information.
Columns:
 
- <Study ID>: The unique identifier for the subject.
- <UID>: A three-digit identifier assigned to each Holter recording.
- <Annotated>: Indicates whether the Holter recording includes rhythm annotations.
- <Height (m)>: The patient's height as recorded in the EMR.
- <Weight (kg)>: The patient's weight as recorded in the EMR.
- <BMI>: The patient's Body Mass Index (BMI), calculated based on the height and weight in the EMR.
- <Date Holter>: The date on which the Holter recording was made.
- <Indication of Holter>: The reason for the Holter recording, as documented in the medical report.
- <Age at Holter>: The subject's age in years at the time of the Holter recording.
- <Sex>: The subject's gender, categorized as either "male" or "female."
- <AF type>: The final diagnosis of the subject based on the medical report following the Holter examination.
- <Documented AFL>: Indicates whether atrial flutter (AFL) was documented prior to the Holter recording.
- <Previous AF ablation>: Indicates whether the subject had undergone catheter ablation for AF prior to the Holter examination.
- <PPM on Holter>/<PPM after Holter>: Indicates whether the subject had a pacemaker implanted during or after the Holter recording.
- <PPM indication>: The reason for pacemaker implantation, if applicable.
- <PPM date>: The date on which the pacemaker was implanted, if applicable.
- <Date of first diagnosis of AF/AFL>: The date when the subject was first diagnosed with AF or AFL.
- <AF duration (months)>: The duration of AF in months, from the first diagnosis of AF/AFL until the Holter recording.
- <Antiarrhythmic drug (non-BB)>/<BB>/<Anticoagulation>: Lists any permanent medications taken by the subject prior to the Holter recording, including Beta-Blockers (BB), non-BB antiarrhythmic drugs, and anticoagulants.
- <Date of 1st AF ablation>/<Ablation 1 PVI>/<Ablation 1 CTI>/<Ablation 1 others>/<Date of AF redo ablation>/<Redo detail>: Information regarding any AF ablation procedures, including the date of the first procedure, the type of ablation (PVI, CTI, or others), and details on any redo ablations.
- <Echo date>/<Echo LAD>/<Echo LVEF>/<Echo LV Asynergy>: Details about any echocardiogram performed on the subject, including the date of the echo, left atrial diameter (LAD), left ventricular ejection fraction (LVEF), and left ventricular asynergy.
- <Mild MR>/<Mild TR>/<Mild AS>/<Mild AR>: Indication of heart valve conditions present in the subject, including Mitral Regurgitation (MR), Tricuspid Regurgitation (TR), Aortic Stenosis (AS), and Aortic Regurgitation (AR).
- <CHF>/<HTN>/<DM>/<Vasc>: Indications of relevant comorbidities, including Congestive Heart Failure (CHF), Hypertension (HTN), Diabetes Mellitus (DM), and Vascular Disease (Vasc).
- <Stroke>: Indicates if the subject had a stroke prior to the Holter recording.
- <Comments>: Miscellaneous textual information not covered in the other columns.

Each file name corresponds uniquely to a UID, specifically matching the 'UID' field in the AdditionalData.csv.

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Citation
1. Tsutsui, K., Brimer, S.B., Ben-Moshe, N., Sellal, J.M., Oster, J., Mori, H., Ikeda, Y., Arai, T., Nakano, S., Kato, R., & Behar, J.A. (2024). SHDB-AF: a Japanese Holter ECG database of atrial fibrillation. *arXiv preprint arXiv:2406.16974*. 2024 Jun 22.

2. Tsutsui, K., Brimer, S., & Behar, J. (2024). SHDB-AF: a Japanese Holter ECG database of atrial fibrillation (version 1.0.0). *PhysioNet*. https://doi.org/10.13026/10mk-y852.