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Pediatric ECGs: Difference between revisions
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→Distinguishing tachyarrhythmias in infants
Secretariat (talk | contribs) |
Secretariat (talk | contribs) |
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! Atrial flutter | ! Atrial flutter | ||
! VT | ! VT | ||
|- | |||
| History | |||
| Sepsis, fever, hypovolaemia, etc. | |||
| Usually otherwise normal | |||
| Most have a normal heart | |||
| Many with abnormal heart | |||
|- | |||
| Rate | |||
| Almost always <230 b/min | |||
| Most often 260–300 b/min | |||
| Atrial 300–500 b/min. Vent. 1:1 to 4:1 conduction | |||
| 200–500 b/min | |||
|- | |||
| R-R interval variation | |||
| Over several seconds may get faster and slower | |||
| After first 10–20 beats, extremely regular | |||
| May have variable block (1:1, 2:1, 3:1) giving different ventricular rates | |||
| Slight variation over several beats | |||
|- | |||
| P wave axis | |||
| Same as sinus almost always visible P waves | |||
| 60% visible P waves, P waves <em>do not</em> look like sinus P waves | |||
| Flutter waves (best seen in LII, LIII, aVF, V<sub>1</sub>) | |||
| May have sinus P waves continuing unrelated to VT (AV dissociation), retrograde P waves, or no visible P waves | |||
|- | |||
| QRS | |||
| Almost always same as slower sinus rhythm | |||
| After first 10–20 beats, almost always same as sinus | |||
| Usually same as sinus, may have occasional beats different from sinus | |||
| Different from sinus (<em>not</em> necessarily ‘wide’) | |||
|- | |||
| colspan="5" | | |||
<ul> | |||
<li>SVT = Supraventricular tachycardia</li> | |||
<li>VT = ventricular tachycardia</li> | |||
</ul> | |||
|} | |} | ||