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The JT Interval and Pro-Arrhythmic Risk
Measured from the J-point to the end of the T-wave, the
The JT Interval ... T-wave, the JT interval ... you use the JT Interval ... Pacing Prolonged JT interval ... #JTInterval #QTc
QT/QTc- Interval
•	Start of Q-wave to end of the T-wave (time of ventricular depolarization + repolarization).
•	Life threatening
QT/QTc- Interval ... Prolonged QT/QTc interval ... boxes then QT interval ... • QT interval ... preceding R-R interval
Colorectal Cancer Screening and Polyp Surveillance Intervals
Colon Cancer Screening - Modality - Interval:
 • Colonoscopy -
Polyp Surveillance Intervals ... Screening - Modality - Interval ... Polyp Surveillance Intervals ... #Surveillance #Intervals
The 4 Variants of Sinus Arrhythmia
Phasic Sinus Arrhythmia:
 • The rate increases with respiration and decreases
P wave and PR interval ... normal • The PP intervals ... • The P to P interval ... shorter than the intervals
QT / QTc Interval Measurement in Irregular Rhythms
2 Approaches:
 • Measure and calculate the QTc for
QT / QTc Interval ... (using the RR interval ... associated QT interval ... QTc for the QT intervals ... EricsMedicalLectures/ #QT #QTc #Interval
Antiarrhythmics - Vaughan Williams Classification
Class I (Ia, Ib, Ic) - Na+ Channel Blockade
 • Slows depolarization
and prolongs PR interval ... • Prolongs QT interval ... and prolongs PR interval
Arrhythmias - Differential Diagnosis Algorithm

Bradyarrhythmia (<60 bpm)
 • Sinus Bradycardia
 • Sick Sinus Syndrome
 • SA
(constant R-R Interval ... (variable R-R interval ... (constant R-R Interval ... (variable R-R interval
Second Degree AV Block Type I aka Mobitz I / Wenckebach 
 • Normal P waves.
shortening of the RR interval ... • The RR interval ... the shortest RR interval
Want to remember what drugs prolong the QT interval? Remember COLLAPSE - Kitty Canavan @KathrynCanavan1
#Diagnosis #Peds
prolong the QT interval
Quinidine produces the following ECG changes:
1. Prolongation of Q-T interval:
2. Prolongation of QRS complex:
3. Prominent V
Prolongation of Q-T interval ... prolongation of P-R interval