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<h2>Annotations in the MIT-BIH Malignant Ventricular Fibrillation Database</h2>

<p>

All of the annotations contained in the <tt>.atr</tt> files of

this database are rhythm change annotations, and almost all of them

mark changes in cardiac rhythm (a few indicate episodes of noise or

asystole).  The table below indicates

how the <tt>aux</tt> strings of these annotations should be

interpreted.

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<table width="50%" bgcolor="lightblue" cellpadding=5>

<tr><th><tt>aux</tt> string</th><th>Meaning</th></tr>

<tr><td align="center">(AFIB</td><td align="center">atrial fibrillation</td></tr>

<tr><td align="center">(ASYS</td><td align="center">asystole</td></tr>

<tr><td align="center">(B</td><td align="center">ventricular bigeminy</td></tr>

<tr><td align="center">(BI</td><td align="center">first degree heart block</td></tr>

<tr><td align="center">(HGEA</td><td align="center">high grade ventricular ectopic activity</td></tr>

<tr><td align="center">(N <i>or</i> (NSR</td><td align="center">normal sinus rhythm</td></tr>

<tr><td align="center">(NOD</td><td align="center">nodal ("AV junctional") rhythm</td></tr>

<tr><td align="center">(NOISE</td><td align="center">noise</td></tr>

<tr><td align="center">(PM</td><td align="center">pacemaker (paced rhythm)</td></tr>

<tr><td align="center">(SBR</td><td align="center">sinus bradycardia</td></tr>

<tr><td align="center">(SVTA</td><td align="center">supraventricular tachyarrhythmia</td></tr>

<tr><td align="center">(VER</td><td align="center">ventricular escape rhythm</td></tr>

<tr><td align="center">(VF <i>or</i> (VFIB</td><td align="center">ventricular fibrillation</td></tr>

<tr><td align="center">(VFL</td><td align="center">ventricular flutter</td></tr>

<tr><td align="center">(VT</td><td align="center">ventricular tachycardia</td></tr>

</table>

</center>

<p> In each case, the rhythm change annotations are placed at the

<i>beginning</i> of the episode of the indicated rhythm.  The

previous rhythm continues during episodes marked by (NOISE;  the

noise ends at the time of the next annotation.

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