File: mghdb.txt Massachusetts General Hospital / Marquette Foundation Waveform Database Copyright (C) Massachusetts General Hospital 1992. All rights reserved. Overview ======== The Massachusetts General Hospital / Marquette Foundation Waveform Database is a comprehensive collection of electronic recordings of hemodynamic and electrocardiographic waveforms of patients in critical care units. It is the result of a collaboration between physicians, biomedical engineers, and nurses at the Massachusetts General Hospital. The database consists of 375 hours of recordings from 250 patients and represents a broad spectrum of physiologic and pathophysiologic states. The typical recording includes three ECG leads, arterial pressure, pulmonary arterial pressure, central venous pressure, respiratory impedance, and airway CO2 waveforms. Some recordings include intra-cranial, left atrial, ventricular and/or intra-aortic-balloon pressure waveforms. ECG calibration, pressure zero, pressure calibration, and pressure/catheter frequency response tests are also recorded. Relevant clinical data and events are documented for each file. The database will be made available on ten CD-ROMs, each containing 25 records. The first of these CD-ROMs contains five directories: mghdb MGH/MF Waveform Database, records mgh001 - mgh025 cape Demonstration version of a Computer Aided Patient Emulator lib DB libraries for use with Microsoft C (large and small memory models) bin MS-DOS executable programs for viewing annotated waveforms, and for extracting data in text format mitdb A 1-minute sample of the MIT-BIH Arrhythmia Database The files on the MGH/MF Waveform Database CD-ROMs are in the same format as those on the MIT-BIH Arrhythmia and Polysomnographic Database CD-ROMs and the European ST-T Database CD-ROM. The sample records ================== This directory contains two 1-minute excerpts (records x_mgh020 and x_mgh022), taken from records mgh020 and mgh022 on the first CD-ROM. To print a few values for each signal of record x_mgh022, use the command: rdsamp -p -r x_mgh022 -f 5 -t 5.1 -v The output appears as: time Lead I Lead II Lead V ART PAP CVP p. Imp. CO2 (sec) (mV) (mV) (mV) (mmHg) (mmHg) (mmHg) (mV) (mV) 5.000 0.093 0.518 -0.424 109.909 26.405 14.746 0.148 -1.005 5.003 0.096 0.527 -0.436 109.909 26.793 14.941 0.149 -1.006 5.006 0.100 0.538 -0.446 110.074 27.277 15.137 0.150 -1.005 5.008 0.106 0.550 -0.453 110.487 27.859 15.234 0.150 -1.005 5.011 0.110 0.558 -0.460 110.983 28.440 15.186 0.149 -1.005 5.014 0.112 0.562 -0.466 111.561 28.828 15.088 0.149 -1.005 5.017 0.117 0.567 -0.476 112.221 29.118 15.039 0.149 -1.005 5.019 0.121 0.572 -0.484 112.882 29.167 14.990 0.150 -1.005 5.022 0.123 0.575 -0.490 113.543 28.828 14.941 0.149 -1.006 5.025 0.126 0.575 -0.495 114.286 28.149 14.746 0.148 -1.006 . . . Note that the last two signals (respiratory impedance and CO2) were not available during this segment; they are present in record `x_mgh020'. The other signals have been calibrated from calibration signals included in the records from which these excerpts were extracted, but not included here. The annotation files for the sample records have the annotator name `ari'. To read the first five seconds of `x_mgh022.ari', use the command: rdann -r x_mghdb -a ari -f 0 -t 5 The output appears as: 0:00.000 0 " 0 0 0 15 c calibration pulse 0:00.000 0 " 0 0 0 17 # pressure line flushed 0:00.000 0 " 0 0 0 20 x signal source change 0:00.000 0 " 0 0 0 21 w wedge recording (PCW) 0:00.000 0 " 0 0 0 23 * pop test 0:00.000 0 " 0 0 0 24 z zero pressure 0:00.363 131 V 0 0 0 0:01.027 370 N 0 0 0 0:01.602 577 V 0 0 0 0:02.369 853 N 0 0 0 0:02.944 1060 V 0 0 0 0:03.488 1256 V 0 0 0 0:04.305 1550 N 0 0 0 0:04.858 1749 V 0 0 0 The first six lines of output correspond to annotation table modification labels. These six labels specify annotation codes and mnemonics for events defined uniquely for the MGH/MF Waveform Database. (See the descriptions of `annstr' and `setannstr' in the ECG Database Programmer's Guide for further information about modification labels.)