Short QT Syndrome: Difference between revisions
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There is controversy whether short QT intervals are associated with sudden death. One trial found QTc intervals < 300ms to be associated with sudden death.<cite>Gaita</cite> However, a recent Finnish study in a random selection of healthy subjects (n=10 822) did not find an increased incidence of sudden death in patients with short QTc intervals. They defined QTc < 320ms as 'very short' and QTc < 340ms as 'short'. In total, 15 deaths occured in the group with QTc <340ms, with only one possible sudden death (cause of death unknown). They used Friderica's method for QTc correction: [[Image:Fridericia.png|100px]].<cite>Fridericia</cite> They conclude that the ECG is not a good screening tool to find patients with a short QTc interval at risk of sudden death.<cite>Anttonen</cite> | There is controversy whether short QT intervals are associated with sudden death. One trial found QTc intervals < 300ms to be associated with sudden death.<cite>Gaita</cite> However, a recent Finnish study in a random selection of healthy subjects (n=10 822) did not find an increased incidence of sudden death in patients with short QTc intervals. They defined QTc < 320ms as 'very short' and QTc < 340ms as 'short'. In total, 15 deaths occured in the group with QTc <340ms, with only one possible sudden death (cause of death unknown). They used Friderica's method for QTc correction: [[Image:Fridericia.png|100px]].<cite>Fridericia</cite> They conclude that the ECG is not a good screening tool to find patients with a short QTc interval at risk of sudden death.<cite>Anttonen</cite> | ||
[[File:Sqts.svg|thumb|Precordial ECG tracings of a patient with SQTS]] | |||
== References == | |||
<biblio> | |||
#bazett Bazett HC. ''An analysis of the time-relations of electrocardiograms''. Heart 1920;7:353-370. | |||
#Lepeschkin pmid=14954534 | |||
#Gaita pmid=12925462 | |||
#Anttonen pmid=17679619 | |||
#Fridericia Fridericia LS. ''Die Systolendauer im Elektrokardiogramm bei normalen | |||
Menschen und bei Herzkranken''. Acta Med Scand. 1920;53:469–486. | |||
</biblio> | |||
Latest revision as of 13:33, 14 February 2010
There is controversy whether short QT intervals are associated with sudden death. One trial found QTc intervals < 300ms to be associated with sudden death.[1] However, a recent Finnish study in a random selection of healthy subjects (n=10 822) did not find an increased incidence of sudden death in patients with short QTc intervals. They defined QTc < 320ms as 'very short' and QTc < 340ms as 'short'. In total, 15 deaths occured in the group with QTc <340ms, with only one possible sudden death (cause of death unknown). They used Friderica's method for QTc correction: 
.[2] They conclude that the ECG is not a good screening tool to find patients with a short QTc interval at risk of sudden death.[3]
References
- Gaita F, Giustetto C, Bianchi F, Wolpert C, Schimpf R, Riccardi R, Grossi S, Richiardi E, and Borggrefe M. Short QT Syndrome: a familial cause of sudden death. Circulation. 2003 Aug 26;108(8):965-70. DOI:10.1161/01.CIR.0000085071.28695.C4 |
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Fridericia LS. Die Systolendauer im Elektrokardiogramm bei normalen
Menschen und bei Herzkranken. Acta Med Scand. 1920;53:469–486.
- Anttonen O, Junttila MJ, Rissanen H, Reunanen A, Viitasalo M, and Huikuri HV. Prevalence and prognostic significance of short QT interval in a middle-aged Finnish population. Circulation. 2007 Aug 14;116(7):714-20. DOI:10.1161/CIRCULATIONAHA.106.676551 |
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Bazett HC. An analysis of the time-relations of electrocardiograms. Heart 1920;7:353-370.
- LEPESCHKIN E and SURAWICZ B. The measurement of the Q-T interval of the electrocardiogram. Circulation. 1952 Sep;6(3):378-88. DOI:10.1161/01.cir.6.3.378 |