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- Sinus Arrhythmia
- Inferior (+90 deg)
- PR - Normal (~120ms)
- QRS - Normal (~80ms)
- QT - 560-600ms (QTc Bazette ~ 610-630 ms)
- Note absolute QT interval greater than 1/2 of R-R interval
- Up-stroked ST segment I, V2-4
- T Wave Inversion aVL, aVR
- Marked QT Prolongation
- Secondary to toxic ingestion
- Using QT-RR Nomogram as described by Chan et al. this patient is 'at risk' of developing Torsades de Pointes
References / Further Reading
Life in the Fast Lane Blog
- The QT Interval here
- Drugs Causing QT Prolongation here
- Clinical cases of drug-induced QT prolongation
- Polymorphic VT & TdP here
- ECG & Case of toxicological QT prolongation here
Article
- Chan A, Isbister GK, Kirkpatrick CMJ, Duffu SB. Drug-induced QT prolongation and torsades de pointes: evaluation of a QT nomogram. QJM 2007 100(10):609-615 PMID: 17881416 Full text here
- Chan TC, Brady WJ, Harrigan RA, Ornato JP, Rosen P. ECG in Emergency Medicine and Acute Care. Elsevier Mosby 2005.
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