Application programs that deal with annotations should include the line
#include <ecg/ecgcodes.h>
which provides the symbolic definitions of annotation codes given in the
first column of the table below. (The second column of the table shows
the strings returned by annstr and ecgstr.)
Beat annotation codes: NORMAL N Normal beat LBBB L Left bundle branch block beat RBBB R Right bundle branch block beat BBB B Bundle branch block beat (unspecified) APC A Atrial premature beat ABERR a Aberrated atrial premature beat NPC J Nodal (junctional) premature beat SVPB S Supraventricular premature or ectopic beat (atrial or nodal) PVC V Premature ventricular contraction RONT r R-on-T premature ventricular contraction FUSION F Fusion of ventricular and normal beat AESC e Atrial escape beat NESC j Nodal (junctional) escape beat SVESC n Supraventricular escape beat (atrial or nodal) [1] VESC E Ventricular escape beat PACE P Paced beat PFUS f Fusion of paced and normal beat UNKNOWN Q Unclassifiable beat LEARN ? Beat not classified during learning Non-beat annotation codes: VFON [ Start of ventricular flutter/fibrillation FLWAV ! Ventricular flutter wave VFOFF ] End of ventricular flutter/fibrillation NAPC x Non-conducted P-wave (blocked APC) [4] WFON ( Waveform onset [4] WFOFF ) Waveform end [4] PWAVE p Peak of P-wave [4] TWAVE t Peak of T-wave [4] UWAVE u Peak of U-wave [4] PQ ` PQ junction JPT ' J-point PACESP ^ (Non-captured) pacemaker artifact ARFCT | Isolated QRS-like artifact [2] NOISE ~ Change in signal quality [2] RHYTHM + Rhythm change [3] STCH s ST segment change [1,3] TCH T T-wave change [1,3,4] SYSTOLE * Systole [1] DIASTOLE D Diastole [1] MEASURE = Measurement annotation [1,3] NOTE " Comment annotation [3] LINK @ Link to external data [5]
Notes:
SVESC, STCH, and TCH were first introduced
in DB library version 4.0. Codes SYSTOLE, DIASTOLE, and
MEASURE were first introduced in DB library version 7.0.
subtyp
field indicates that the corresponding signal contains noise (the least
significant bit corresponds to signal 0).
aux field contains an ASCII string (with prefixed byte count)
describing the rhythm, ST segment, T-wave change, measurement, or the
nature of the comment. By convention, the character that follows the
byte count in the aux field of a RHYTHM annotation is `('.
See the MIT-BIH Arrhythmia Database Directory for a list of rhythm
annotation strings.
WFON, WFOFF, PWAVE, TWAVE, and
UWAVE were first introduced in DB library version 8.3. The
`p' mnemonic now assigned to PWAVE was formerly assigned to
NAPC, and the `t' mnemonic now assigned to TWAVE was
formerly assigned to TCH. The obsolete codes PQ
(designating the PQ junction) and JPT (designating the J-point)
are still defined in `<ecg/ecgcodes.h>', but are identical to
WFON and WFOFF respectively.
LINK code was first introduced in DB library version 9.6. The
aux field of a LINK annotation contains a URL (a uniform
resource locator, in the form `http://machine.name/some/data',
suitable for passing to a Web browser such as Netscape or Mosaic). LINK
annotations may be used to associate extended text, images, or other data with
an annotation file. If the aux field contains any whitespace, text
following the first whitespace is taken as descriptive text to be displayed by
a DB browser such as WAVE.
The annotation codes in the table above are the predefined values of the
anntyp field in a DB_Annotation. Other values in the range
of 1 to ACMAX (defined in `<ecg/ecgcodes.h>') are legal but
do not have preassigned meanings. The constant NOTQRS, also defined in
`<ecg/ecgcodes.h>', is not a legal value for anntyp, but is
a possible output of the macros discussed below.
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