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Goldberger AL, Amaral LAN, Glass L, Hausdorff JM, Ivanov PCh, Mark RG, Mietus JE, Moody GB, Peng C-K, Stanley HE. PhysioBank, PhysioToolkit, and PhysioNet: Components of a New Research Resource for Complex Physiologic Signals. Circulation 101(23):e215-e220 [Circulation Electronic Pages; http://circ.ahajournals.org/cgi/content/full/101/23/e215]; 2000 (June 13).
The research material included in the Abdominal and Direct Fetal Electrocardiogram Database contains multichannel fetal electrocardiogram (FECG) recordings obtained from 5 different women in labor, between 38 and 41 weeks of gestation. The recordings were acquired in the Department of Obstetrics at the Medical University of Silesia, by means of the KOMPOREL system for acquisition and analysis of fetal electrocardiogram (ITAM Institute, Zabrze, Poland). Each recording comprises four differential signals acquired from maternal abdomen and the reference direct fetal electrocardiogram registered from the fetal head.
The configuration of the abdominal electrodes comprised four electrodes placed around the navel, a reference electrode placed above the pubic symphysis and a common mode reference electrode (with active-ground signal) placed on the left leg. To reduce the skin impedance, the areas under the Ag-AgCl electrodes were abraded. In all cases, the scalp electrode was placed for a clinical indication and all women consented to participate in this study.
The acquisition of direct fetal electrocardiogram was carried out with a typical spiral electrode, commonly used in a direct FECG channel of popular fetal monitors. The R-wave locations were automatically determined in the direct FECG signal by means of on-line analysis applied in the KOMPOREL system. These locations were then verified (off-line) by a group of cardiologists, resulting in a set of reference markers precisely indicating the R-wave locations. The markers have been stored together with the direct and indirect FECG signals in EDF/EDF+ format.
The provided recordings constitute an excellent material for testing and evaluation of efficacy of new FECG processing techniques, e.g. algorithms for suppression of maternal electrocardiogram in abdominal signals or for detection of fetal QRS complexes. In the authors' studies (1-4 above), these recordings were used to evaluate the accuracy of fetal heart rate measurement and to estimate its influence on the quantification of the beat-to-beat fetal heart rate (FHR) variability.
Name Last modified Size Description
Parent Directory - ANNOTATORS 06-Aug-2012 19:43 30 list of annotators MD5SUMS 12-Dec-2012 11:36 574 RECORDS 12-Dec-2012 11:35 40 list of record names SHA1SUMS 12-Dec-2012 11:36 678 SHA256SUMS 12-Dec-2012 11:36 1.0K r01.edf 02-Aug-2012 06:14 2.9M digitized signals r01.edf.qrs 02-Aug-2012 06:14 1.3K verified beat annotations r04.edf 02-Aug-2012 06:15 2.9M digitized signals r04.edf.qrs 02-Aug-2012 06:15 1.3K verified beat annotations r07.edf 02-Aug-2012 06:15 2.9M digitized signals r07.edf.qrs 02-Aug-2012 06:15 1.3K verified beat annotations r08.edf 02-Aug-2012 06:15 2.9M digitized signals r08.edf.qrs 02-Aug-2012 06:16 1.3K verified beat annotations r10.edf 02-Aug-2012 06:16 2.9M digitized signals r10.edf.qrs 02-Aug-2012 06:16 1.3K verified beat annotations