Short QT: Difference between revisions
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==Background== | ==Background== | ||
* | *Clinically important due to potential to cause atrial and ventricular [[tachycardia]]s, [[syncope]], and sudden [[cardiac arrest]] | ||
== | ==Etiology== | ||
*Congenital short QT syndrome (rare, but important cause of sudden cardiac death) | |||
*[[Hypercalcemia]] | *[[Hypercalcemia]] | ||
*[[Hyperkalemia]] | |||
*[[Digoxin toxicity]] | *[[Digoxin toxicity]] | ||
* | *[[Acidosis]] | ||
*[[SIRS]] | |||
*[[ACS]] | |||
*Increased vagal tone | |||
==Clinical features== | |||
*[[Syncope]] | |||
*[[Cardiac arrest]] | |||
*[[Palpitations]] | |||
*EKG findings: | |||
**QTc < 360 (males) or <370 (females) | |||
**In congenital short QT, also have: | |||
***Lack of normal QT changes with HR | |||
***Peaked T waves (especially in precordial leads) | |||
***Short or absent ST segments | |||
***+/- early repolarization | |||
==Management== | |||
*Evaluate for and treat underlying causes | |||
*Congenital short QT: refer to cardiology, may need ICD | |||
==References== | ==References== | ||
Revision as of 03:27, 11 September 2016
Background
- Clinically important due to potential to cause atrial and ventricular tachycardias, syncope, and sudden cardiac arrest
Etiology
- Congenital short QT syndrome (rare, but important cause of sudden cardiac death)
- Hypercalcemia
- Hyperkalemia
- Digoxin toxicity
- Acidosis
- SIRS
- ACS
- Increased vagal tone
Clinical features
- Syncope
- Cardiac arrest
- Palpitations
- EKG findings:
- QTc < 360 (males) or <370 (females)
- In congenital short QT, also have:
- Lack of normal QT changes with HR
- Peaked T waves (especially in precordial leads)
- Short or absent ST segments
- +/- early repolarization
Management
- Evaluate for and treat underlying causes
- Congenital short QT: refer to cardiology, may need ICD
References
- Merino JL and Reviriego. Short QT Syndrome: An article from the E-Journal of the ESC Council for Cardiology Practice. Vol. 9, N° 2 - 17 Sep 2010. http://www.escardio.org/Guidelines-&-Education/Journals-and-publications/ESC-journals-family/E-journal-of-Cardiology-Practice/Volume-9/Short-QT-Syndrome.