Version 1 - June 2018
When referencing this material, please cite:
Please also include the standard citation for PhysioNet:
@article{PhysioNet, author = {Goldberger, Ary L. and Amaral, Luis A. N. and Glass, Leon and Hausdorff, Jeffrey M. and Ivanov, Plamen Ch. and Mark, Roger G. and Mietus, Joseph E. and Moody, George B. and Peng, Chung-Kang and Stanley, H. Eugene}, title = {{PhysioBank}, {PhysioToolkit}, and {PhysioNet}: Components of a New Research Resource for Complex Physiologic Signals}, journal = {Circulation}, publisher = {American Heart Association, Inc.}, volume = {101}, number = {23}, year = {2000}, month = {June}, pages = {e215--e220}, doi = {10.1161/01.CIR.101.23.e215}, issn = {0009-7322}, url = {http://circ.ahajournals.org/content/101/23/e215} }
Introduction
This dataset contains signals and numerics extracted from the much larger MIMIC II matched waveform Database, along with manual breath annotations made from two annotators, using the impedance respiratory signal.
Data Collection
The original data was acquired from critically-ill patients during hospital care at the Beth Israel Deaconess Medical Centre (Boston, MA, USA). Two annotators manually annotated individual breaths in each recording using the impedance respiratory signal. The 53 recordings within the dataset, each of 8-minute duration, each contain:
- Physiological signals, such as the PPG, impedance respiratory signal, and electrocardiogram (ECG). These are sampled at 125 Hz.
- Physiological parameters, such as the heart rate (HR), respiratory rate (RR), and blood oxygen saturation level (SpO2). These are sampled at 1 Hz.
- Fixed parameters, such as age and gender
- Manual annotations of breaths.
This dataset was first reported in the referenced publication, in which the data was used to evaluate the performance of different algorithms for estimating respiratory rate from the pulse oximetry, or photoplethysmogram (PPG) signal.
Data Files
The dataset is distributed in three formats:
- WFDB (WaveForm DataBase) format, which is the standard format used by PhysioNet.
- CSV (comma-separated-value) format
- Matlab (r) format, in a manner which is a compatible with the RRest Toolbox of respiratory rate algorithms
WFDB Format
Five files are provided for each recording (where ## is the subject number):
- bidmc##.breath: Manual breath annotations
- bidmc##.dat: Waveform data file
- bidmc##.hea: Waveform header file
- bidmc##n.dat: Numerics data file
- bidmc##n.hea: Numerics header file
Further details on the contents of each file are provided here
CSV Format
Separate CSV files are provided for each recording (where ## is the subject number), containing:
- bidmc_##_Breaths.csv: Manual breath annotations
- bidmc_##_Signals.csv: Physiological signals
- bidmc_##_Numerics.csv: Physiological parameters
- bidmc_##_Fix.txt: Fixed variables
Matlab (r) Format
The *bidmc_data.mat* file contains the following subset of the dataset in a single Matlab (r) variable named *data*. The following are provided for each of the 53 recordings:
- ekg: Lead II ECG signal. Each signal is provided in a structure, where the *v* field denotes the signal values, and *fs* is the sampling frequency.
- ppg: Photoplethysmogram signal
- ref.resp_sig.imp: Impedance respiratory signal
- ref.breaths: Manual annotations of breaths provided by two independent annotators. A vector of sample numbers is provided, which correspond to the signal sample numbers.
- ref.params: Physiological parameters: rr (respiratory rate, derived by the monitor from the impedance signal, breaths per minute), hr (heart rate, derived from the ECG, beats per minute), pr (pulse rate, derived from the PPG, beats per minute), spo2 (blood oxygen saturation level, %).
- fix: A structure of fixed variables, including: id (the MIMIC II matched waveform database subject ID and recording identifier), loc (the ward location), and source (the URLs from which the original data were downloaded).
Contributors
For more information about the dataset, please contact the authors at: marco.pimentel@eng.ox.ac.uk, peter.charlton@kcl.ac.uk.
Name Last modified Size Description
Parent Directory -
ANNOTATORS 2018-06-20 13:15 77 list of annotators
DBS 2018-06-20 13:15 44
DOI 2018-08-29 16:49 19
LICENSE 2018-06-20 13:15 939
MD5SUMS 2018-08-30 16:38 12K
RECORDS 2018-10-19 18:48 424 list of record names
SHA1SUMS 2018-08-30 16:38 15K
SHA256SUMS 2018-08-30 16:38 21K
bidmc01.breath 2018-06-20 13:15 2.6K
bidmc01.dat 2018-06-20 13:15 586K digitized signal(s)
bidmc01.hea 2018-06-20 13:15 595 header file
bidmc01n.dat 2018-06-20 13:15 3.8K digitized signal(s)
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bidmc_csv/ 2018-06-20 12:13 -
bidmc_data.mat 2018-06-20 13:15 28M
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PhysioNet is supported by the National Institute of General Medical Sciences (NIGMS) and the National Institute of Biomedical Imaging and Bioengineering (NIBIB) under NIH grant number 2R01GM104987-09.
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