13 results
QT / QTc Interval Measurement in Irregular Rhythms
2 Approaches:
 • Measure and calculate the QTc for
QT / QTc Interval ... Measurement in ... the associated QT ... for the QT intervals ... #Rhythm #cardiology
Normal QT Interval Measurement
General rule: QT interval should be < 1/2 RR interval
   -
Normal QT Interval ... rule: QT interval ... #QTc #Interval ... #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 ... #cardiology #diagnosis ... #ecg #ekg #electrocardiogram
QT / QTc Interval Measurement in Prominent U Wave
If the U wave is distinct from the
QT / QTc Interval ... of the QT interval ... EricsMedicalLectures/ #QT ... #QTc #Interval ... #ecg #ekg #electrocardiogram
Torsades de Pointes 
•Precipitated by drugs that prolong the QT interval 
•Class IA antidysrhythmics (procainamide, quinidine)
that prolong the QT ... interval •Class ... hypomagnesemia, hypokalemia ... TorsadesDePointes #Diagnosis #Cardiology ... #ECG #EKG
EKG Interpretation Cheat Sheet
1) Rate 
 - Regular - Count-Off 
 - Irregular - Count number
EKG Interpretation ... Flattened T waves QT ... • QT interval is ... = QT / √ RR - ... thumb: a normal QT
This one at K = 2.4
The down up morphology remains
The computer measures the QT at 565
computer measures the QT ... at 565 ms, QTc ... at 591 ms This measurment ... , not the QT) - ... #EKG #Hypokalemia
Torsades de Pointes
• "Twisting of the pointes" 
• QRS axis swings from positive to negative direction
that prolong the QT ... interval ... Hypomagnesemia Hypokalemia ... TorsadesDePointes #Diagnosis #Cardiology ... #ECG #EKG
Approach to ECGs
Check
 - Age, gender, name
 - 25mm/s; 10mm/mV
 - 1mm = 40ms; 0.1 mV
Rate
dextrocardia, normal Intervals ... ICD/pacer - QTc ... DANGER - Short QT ... : ↑ca - Long QT ... #interpretation
Checklist Approach to Hypokalemia

Consider risk factors for arrhythmia:
 - EKG changes (especially QT prolongation)
 - Digoxin
Checklist Approach to Hypokalemia ... arrhythmia: - EKG ... changes (especially QT ... route = severe hypokalemia ... #Management #CriticalCare