- ...available:
- Sources:
ECRI, 5200 Butler Pike, Plymouth Meeting, PA 19462 USA (AHA DB); MIT-BIH
Database Distribution, MIT Room 20A-113, 77 Massachusetts Avenue, Cambridge,
MA 02139 USA (MIT, ESC, NST, and CU databases). Outside of North America, the
ESC DB is available from: CNR Institute of Clinical Physiology, Computer
Laboratory, via Trieste, 41, 56100 Pisa, Italy. Except for the AHA DB,
all are available in CD-ROM format.
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- ...Practice.
- Testing and Reporting Performance
Results of Ventricular Arrhythmia Detection
Algorithms. Publication AAMI ECAR (1987); available from AAMI, 3330
Washington Boulevard, Suite 400, Arlington, VA 22201 USA.
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- ...devices.
- American National Standard
for Ambulatory Electrocardiographs. Publication ANSI/AAMI EC-38 (1994);
available from AAMI (address above).
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- ...MIT
- Source: MIT-BIH Database Distribution
(address above).
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- ...board
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Source: Microstar Laboratories, http://www.mstarlabs.com/.
External analog anti-aliasing filters (to reduce
``staircasing'') and attenuators (to obtain patient-level signals) may also be
required, depending on the system to be evaluated. DAP boards can also be
used with sample to create new database records.
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- ...associated.
- Times in annotation and signal files are usually expressed
as sample numbers (the number of samples in the signal file that precede
the sample in question).
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- ...annotation.
- Test annotations that include heart rate or ST
measurements require substantially more storage. getann and
putann can also use the original AHA DB format (containing fixed-length
annotations, 16 bytes each), but this format should not be used for
evaluations of devices that incorporate ST analysis functions, since the
space available for the aux data is too small to store ST measurements.
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- ...frequency.
-
The obvious alternative, using xform to rewrite the reference annotation
files at the time the signal files are resampled, should not be used in a
formal evaluation. Because of the possibility that resampling the reference
annotation files might result in moving reference annotations into or out of
the test period, or changing the lengths of episodes, doing so might produce
results that could not be directly compared with those obtained in a standard
evaluation.
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- ...sources.
- See, for example, the European ST-T Database
Directory, pp. vi-vii, supplied with the ESC DB; or Taddei, A., et al., ``The
European ST-T database: development, distribution, and use'', Computers
in Cardiology 17:177-180 (1990).
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- ...zero!
-
For certain types of HRV or RRV measurements (though not for heart rate
measurements), this is a potential problem. One solution is to add a small
positive offset to any measurement with an expected zero mean. It is within
the letter, though not the spirit, of the standard protocol, to add a
very large number in such a case, so as to make the error percentage
arbitrarily small. The mean value of the reference measurements must be
reported; this should serve as a disincentive to this sort of creative abuse
of the standard. An honest approach might be to add an offset on the order of
the expected standard deviation of the individual measurements.
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- ...error.
-
mxm is not restricted to comparison of heart rate measurements; if
other types of measurements are available, they may be compared in the same
manner as heart rates by mxm.
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- ...``atr'')
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Annotation files for any given record are distinguished by annotator names,
which, under MS-DOS, correspond to the ``extension'' of the file name. The
reference annotation files supplied with the databases have the annotator
name ``atr'' (from ``atruth'', as used in environments with less
restrictive file-naming schemes, originally because ``a'' was intended to
indicate the file type, and ``truth'' because ...well, because the
annotations are supposed to be The Truth).
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- ...record.
-
stm.out contains one line for each ST deviation measurement that was
compared; in this example, stm.out would be empty since the reference
annotation files of the MIT DB do not contain ST deviation measurements.
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- ...wview
-
view (for MS-DOS), dbplot (for a variety of graphics devices under
UNIX), and dbtool (for SunView) are included in the DB Software Package.
The DB Software Package, and binary versions of wave (for SunOS,
Solaris, and Linux) and of wview (for MS Windows), are included
on the third edition of the MIT-BIH Arrhythmia Database CD-ROM.
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