Normal cardiac electrophysiology values

Important intervals in cardiac electrophysiology

1. PA interval: 25-55 ms

2. AH interval: 55-125 ms

3. HBE interval: <30 ms

4. HV interval: 35-55 ms

5. QRS: ≤ 100 ms

6. Corrected QT interval (QTc): ≤ 450 ms (for males); ≤ 470 ms (for females)

7. Sinus node recovery time (SNRT): ≤1500 ms

8. Corrected sinus node recovery time (CSNRT): ≤ 550 ms

9. Sinoatrial conduction time (SACT): 50-115 ms

10. Atrial effective refractory period (ERP): 180-330 ms

11. AV nodal ERP: 250-400 ms

12. Ventricular ERP: 180-290 ms

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ECG Quiz

Case History: A 46-year old female presents with history of palpitations. At the time of palpitations, she also had rapid neck pulsations. She presented to emergency and an ECG was done. What are the findings? What is the diagnosis? Click here to reveal the answer The ECG shows a regular narrow complex tachycardia (ventricular rate of approximately 250/min). The P waves are not clearly visible, but there is a small deflection at the end of QRS in various leads. In lead I, this is pseudo r' and in leads this is pseudo s wave. The patient was found to have AVNRT on EPS and slow pathway was ablated successfully.

Peripartum Cardiomyopathy

Peripartum Cardiomyopathy (PPCM) • Usually develops in last month of pregnancy or first 5 months post-delivery. • Presents as heart failure with reduced ejection fraction (dilated cardiomyopathy) ↳ LV EF < 45% • PPCM is a diagnosis of exclusion. • Risk factors → 1- History of Hypertension, Pre-eclampsia 2- Black women • Incidence → 1 in 2000 live births. • Management → 1. Guideline directed medical therapy for HF- Beta-blockers Hydralazine plus isosorbide dinitrate Diuretics 2. Bromocriptine 3. Low threshold for anticoagulation 4. ...

MCQ

Cardiology MCQ Q. Which of the following leads is not an inferior lead in ECG? A. Lead II B. Lead III C. Lead aVF D. Lead aVR Click the button below to view answer Show answer Correct answer is option D. Lead aVR

Learning Cardiology

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