Differential Diagnosis for RBBB with Left Axis Deviation
- Single most likely diagnosis
- Left ventricular hypertrophy (LVH): This is the most common cause of left axis deviation in the presence of RBBB, as the increased muscle mass in the left ventricle can lead to a shift in the electrical axis of the heart.
- Other Likely diagnoses
- Inferior wall myocardial infarction (MI): An inferior wall MI can cause left axis deviation due to the involvement of the inferior wall, which can affect the electrical conduction pathways of the heart.
- Cardiomyopathy: Certain types of cardiomyopathy, such as dilated cardiomyopathy, can cause left axis deviation and RBBB due to the enlargement and dysfunction of the left ventricle.
- Hypertension: Uncontrolled hypertension can lead to LVH, which can cause left axis deviation and RBBB.
- Do Not Miss diagnoses
- Tricuspid atresia: This congenital heart defect can cause left axis deviation and RBBB, and is a life-threatening condition if not diagnosed and treated promptly.
- Cardiac sarcoidosis: This condition can cause left axis deviation and RBBB due to the infiltration of sarcoid granulomas into the heart tissue, and can be life-threatening if not diagnosed and treated.
- Lyme carditis: This condition can cause left axis deviation and RBBB due to the inflammation of the heart tissue caused by the Lyme disease bacteria.
- Rare diagnoses
- Lenegre's disease: This is a rare condition that affects the conduction system of the heart, causing left axis deviation and RBBB.
- Lev's disease: This is a rare condition that affects the conduction system of the heart, causing left axis deviation and RBBB.
- Cardiac amyloidosis: This condition can cause left axis deviation and RBBB due to the deposition of amyloid proteins into the heart tissue, and is a rare but serious condition.