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ecg electrocardiogram avblock differential interval measurement heartblock mobitz second syncope type1 wenckebach atrioventricular blocks classification clinical digitalis digoxin interpretation rhythm
QT / QTc Interval Measurement in Irregular Rhythms 2 Approaches: • Measure and calculate the QTc for
QT / QTc Interval ... for the QT intervals ... #QTc #Interval ... Irregular #Rhythm #cardiology ... #diagnosis #ecg
Normal QT Interval Measurement General rule: QT interval should be < 1/2 RR interval -
Normal QT Interval ... #QTc #Interval ... #Measurement #cardiology ... #diagnosis #ecg ... #ekg #electrocardiogram
QT / QTc Interval Measurement in Wide QRS Complex - A wide QRS complex will lead
QT / QTc Interval ... increase in the QT ... #QTc #Interval ... #diagnosis #ecg ... #ekg #electrocardiogram
EKG Interpretation Cheat Sheet 1) Rate - Regular - Count-Off - Irregular - Count number
120 ms = AV junction ... Flattened T waves QT ... • QT interval is ... = QT / √ RR - ... thumb: a normal QT
Mobitz Type I (Wenckebach Phenomenon) 2nd Degree AV Block on EKG • P-R interval gradually increases
Phenomenon) 2nd Degree ... AV Block on EKG ... • P-R interval ... resets • P-P interval ... #diagnosis #cardiology
Approach to ECGs - Syncope Syndromes Electrolytes • ↑K - brady, peak T, wide QRS, no P,
• ↑ Ca - short QT ... assoc with 1K, AV ... see below), 1st degree ... #EKG #Checklist ... #diagnosis #cardiology
Second Degree Heart Block, Mobitz Type I (Wenckebach) P waves and QRS complexes are normal but... •
Second Degree Heart ... • PR interval ... always within the AV ... SecondDegree #HeartBlock #Diagnosis ... #Cardiology #EKG
Torsades de Pointes •Precipitated by drugs that prolong the QT interval •Class IA antidysrhythmics (procainamide, quinidine)
that prolong the QT ... interval •Class ... TorsadesDePointes #Diagnosis ... #Cardiology #ECG ... #EKG
Atrioventricular (AV) Blocks First Degree AV Block - "If your R is far from your P than
with prolonged PR interval ... progressively prolonged PR intervals ... node Second Degree ... heart #heartblock #cardiology ... #ecg #ekg #diagnosis
Electrocardiographic Features of Digoxin Toxicity • Virtually any arrhythmia is possible. None specific for digoxin toxicity
ventricular rate (↓ AV ... Shortening of QT ... interval • "Scooped ... Electrocardiogram #ekg ... #cardiology #diagnosis
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