The document discusses different types of myocardial infarctions (MIs) including inferior wall MIs, which are the most common but also very lethal with 50% having right ventricular involvement. Right ventricular infarctions should not be given nitroglycerin or morphine due to preload problems. Septal and lateral MIs are usually extensions of anterior or inferior MIs. Posterior wall MIs show ST elevation in leads V8 and V9 with only 8% having reciprocal changes in V1-V3. Bundle branch blocks and left ventricular hypertrophy are also discussed along with STEMI imposters including digitalis toxicity, hyperkalemia, pericarditis, and early repolarization.
Right atrial overload (P pulmonale) and right ventricular hypertrophy. Right atrial overload (enlargement) is manifest as tall sharp P waves in lead II and V1. The cut off values are P wave amplitude more than 0.25 mV in lead II and 0.1 mV or more in V1. Dominant R waves in V1 and deep S waves in V6 indicate right ventricular hypertrophy (RVH). Sokolow-Lyon for RVH criteria mentions that R wave in V1 + S wave in V5/V6 should be 1.1 mV or more. There is also a clockwise rotation in the QRS pattern between V1 to V6. QRS axis is around +120 degrees (aVR biphasic and lead III showing tallest QRS complex). Right axis deviation is also due to right ventricular hypertrophy. T wave inversion in inferior leads and V1 could be due to right ventricular hypertrophy itself. RVH in this case is type A with dominant R in V1 and deep S in V6. This type is seen in pulmonary stenosis. Type B RVH shows dominant R waves in V1 without deep S in V6. Deep S in V6 without dominant R in V1 seen in chronic obstructive lung disease with cor-pulmonale is called type C RVH. (Strictly speaking the types are classified depending upon vector cardiographic features and not based on scalar ECG)
Right atrial overload (P pulmonale) and right ventricular hypertrophy. Right atrial overload (enlargement) is manifest as tall sharp P waves in lead II and V1. The cut off values are P wave amplitude more than 0.25 mV in lead II and 0.1 mV or more in V1. Dominant R waves in V1 and deep S waves in V6 indicate right ventricular hypertrophy (RVH). Sokolow-Lyon for RVH criteria mentions that R wave in V1 + S wave in V5/V6 should be 1.1 mV or more. There is also a clockwise rotation in the QRS pattern between V1 to V6. QRS axis is around +120 degrees (aVR biphasic and lead III showing tallest QRS complex). Right axis deviation is also due to right ventricular hypertrophy. T wave inversion in inferior leads and V1 could be due to right ventricular hypertrophy itself. RVH in this case is type A with dominant R in V1 and deep S in V6. This type is seen in pulmonary stenosis. Type B RVH shows dominant R waves in V1 without deep S in V6. Deep S in V6 without dominant R in V1 seen in chronic obstructive lung disease with cor-pulmonale is called type C RVH. (Strictly speaking the types are classified depending upon vector cardiographic features and not based on scalar ECG)
Right atrial overload (P pulmonale) and right ventricular hypertrophy. Right atrial overload (enlargement) is manifest as tall sharp P waves in lead II and V1. The cut off values are P wave amplitude more than 0.25 mV in lead II and 0.1 mV or more in V1. Dominant R waves in V1 and deep S waves in V6 indicate right ventricular hypertrophy (RVH). Sokolow-Lyon for RVH criteria mentions that R wave in V1 + S wave in V5/V6 should be 1.1 mV or more. There is also a clockwise rotation in the QRS pattern between V1 to V6. QRS axis is around +120 degrees (aVR biphasic and lead III showing tallest QRS complex). Right axis deviation is also due to right ventricular hypertrophy. T wave inversion in inferior leads and V1 could be due to right ventricular hypertrophy itself. RVH in this case is type A with dominant R in V1 and deep S in V6. This type is seen in pulmonary stenosis. Type B RVH shows dominant R waves in V1 without deep S in V6. Deep S in V6 without dominant R in V1 seen in chronic obstructive lung disease with cor-pulmonale is called type C RVH. (Strictly speaking the types are classified depending upon vector cardiographic features and not based on scalar ECG)
Right atrial overload (P pulmonale) and right ventricular hypertrophy. Right atrial overload (enlargement) is manifest as tall sharp P waves in lead II and V1. The cut off values are P wave amplitude more than 0.25 mV in lead II and 0.1 mV or more in V1. Dominant R waves in V1 and deep S waves in V6 indicate right ventricular hypertrophy (RVH). Sokolow-Lyon for RVH criteria mentions that R wave in V1 + S wave in V5/V6 should be 1.1 mV or more. There is also a clockwise rotation in the QRS pattern between V1 to V6. QRS axis is around +120 degrees (aVR biphasic and lead III showing tallest QRS complex). Right axis deviation is also due to right ventricular hypertrophy. T wave inversion in inferior leads and V1 could be due to right ventricular hypertrophy itself. RVH in this case is type A with dominant R in V1 and deep S in V6. This type is seen in pulmonary stenosis. Type B RVH shows dominant R waves in V1 without deep S in V6. Deep S in V6 without dominant R in V1 seen in chronic obstructive lung disease with cor-pulmonale is called type C RVH. (Strictly speaking the types are classified depending upon vector cardiographic features and not based on scalar ECG)
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Dr Natasha Azzopardi Muscat, Director, Country Health Policies and Systems Division, World Health Organisation EURO
Dr Marta Lomazzi, Executive Manager, World Federation of Public Health Associations
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3. Inferior Wall MI
• Most common
• Very lethal
• 50% have RV involvement
• Can also have 1st degree or 2nd degree type I
• Nausea
• Look for RVI with V4R, nitrates with caution..
• Fluids
4.
5. Right Ventricular Infarction
• No Nitro
• No morphine
• Big preload problem
• 50% of Inferior wall MI have RV involvement
6.
7.
8.
9. Septal and Lateral
• Rarely seen alone
• Usually an extension of anterior or inferior
