Normal QT Interval Duration: 0.3-0.44 s (0.46 s for women); tends to increase as the heart rate decreases Bazett’s formula for corrected QT interval (QTc):…
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ECG
ECG Guide for Surgeons
There is an old saying that two surgeons and an ECG form a double-blind-study. Then, there’s a protocol for surgeons intended for humor: All spikes…
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ECG Axis Determination : Mnemonic
Lead I = left (0 degrees)Lead aVF = floor (90 degrees) Lead I +ve and Lead aVF +ve = Between 0-90 degrees (Normal axis) Lead…
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Bundle Branch Block : Mnemonic
If the QRS complex is wide (>0.12 s/>3 small squares), the ventricular activity may be arising from the ventricle conducting system. caused by a ‘bundle…
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Supraventricular Tachycardia vs Sinus Tachycardia
Yesterday, I had encountered a tachycardic patient with heart rate 160/min. Somewhere in medical school, I was taught that the sinus tachycardia with heart rate…
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ECG changes in Pericarditis
Synonyms: Acute pericarditis, Viral pericarditis, Infectious pericarditis Definition: Diffuse inflammation of the pericardial lining surrounding the heart and characterized by sharp pleuritic, retrosternal chest pain…
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ECG changes in Chronic Obstructive Pulmonary Disease (COPD)
Synonyms: Emphysema, Chronic bronchitis, Chronic Obstructive Lung Disease (COLD), Chronic Obstructive Airway Disease (COAD), Smoker’s lung Definition: COPD is a lung disease characterized by airflow…
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ECG changes in Pulmonary embolism
Synonyms: Pulmonary artery embolism, Pulmonary embolus, PE Definition: A pulmonary embolus (PE) is a blood clot that embolizes to the lungs. When a clot from…
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