QT interval: the interval from the beginning of the QRS complex to the end of the T wave on the surface electrocardiogram (ECG). This represents the period from the onset of ventricu...
Incidental finding on ECG in asymptomatic patients
Evaluate for syncope, presyncopal episodes, palpitations, and associated precipitating events (emotional triggers, swimming, diving).
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Treat VT, TdP, and VF emergently per ACLS guidelines.
Withdraw offending agents and correct electrolytes (2)[C].
Treat underlying disorder in the setting of gastrointestinal i...
On routine visits, ask about syncope, presyncope, and palpitations in those who have QTc prolongation.
Consider ECG and/or outpatient cardiac rhy...
9651007 Long QT syndrome (disorder)
442946007 Aquired long QT syndrome
442917000 Congenital long QT syndrome
Evaluate for acquired causes before making a diagnosis of hereditary LQTS.
For accurate diagnosis, calculate QTc manually.
Magnesium sulfate is the treatment of choice during ACLS for Td...
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FIGURE 82.15. Electrolyte effects on EKG Q-T interval. Note prolongation with hypocalcemia, shortening with hypercalcemia.
Electrocardiogram from a 44-year-old woman with acquired long-QT syndrome. The electrocardiogram demonstrates T-wave alternans before the onset of torsades de pointes.
Electrocardiogram from a 44-year-old woman with acquired long-QT syndrome. The electrocardiogram demonstrates T-wave alternans before the ...