Rhythm InterpretationPregunta 30 de 100
What does the QT interval measure on an EKG tracing?
a.The time for the atria to depolarize and repolarize
b.The total time for ventricular depolarization and repolarization
c.The delay of the impulse at the AV node
d.The time between two consecutive R waves
Explicación
The QT interval is measured from the start of the QRS complex to the end of the T wave and represents the full cycle of ventricular depolarization and recovery; it normally occupies less than half of the R-R interval and generally measures under about 0.44 second at normal rates. Atrial activity is represented by the P wave. The AV nodal delay lies inside the PR interval, and the R-R interval measures rate and regularity.
Practica las 100 preguntas gratis — sin registro.
Preguntas relacionadas de este tema
- A strip shows a sharp, narrow vertical spike immediately before each wide QRS complex at a regular rate of 70. What does this indicate?
- A monitor alarms for ventricular fibrillation, but the technician finds the patient sitting up, alert, and brushing her teeth, and a regular narrow-complex rhythm is visible between the chaotic sections. What is the most likely explanation?
- Which group of rhythms is considered immediately life-threatening and requires the technician to summon help right away?
- A strip shows a normal sinus beat followed by a wide bizarre beat, then another sinus beat followed by another wide bizarre beat, repeating throughout the strip. What is this pattern called?
- Which premature ventricular contraction pattern is considered most dangerous because it can trigger ventricular tachycardia or fibrillation?
- An otherwise normal sinus strip contains one early narrow beat with an inverted P wave right in front of it and a PR interval of 0.08 second. What is this beat?
Última revisión: · proceso editorial
Equipo Editorial de PrepPass · Verificado con NHA Certified EKG Technician (CET) Exam · Cómo revisamos