University:
Western Sydney University
Course:
MEDI 2003 | Clinical Sciences 2
Academic year:

2024
Views:

214

Pages:

1
Author:

Mariam A. A.

First Degree Heart Block Definition Delayed signal from atria to ventricle, but the signal still goes around - PR interval of more than 200ms Aetiology/pathogenesis • • • • • • • MI -> ischemia -> scar tissue -> blocks signal Myocarditis -> scar tissue -> blocks signals Lev’s disease -> idiopathic fibrosis and calcification -> blocks heart signal Congenital heart disease Inflammatory cardiomyopathy Autoimmune connective tissue disorder Iatrogenic causes, due to meds such as beta blockers etc. Signs and Symptoms • • • • • Light headiness Dizziness Fatigue dyspnoea however, it is usually asymptomatic Diagnosis • ECG - Signal delayed: PR interval greater than 200ms Treatment • • Identify cause, for example if due to beta blockers, then depending on the patient and their condition either reduce the dose or cut it out. Usually, no treatment required Complications • • • Reduction in left ventricular stroke volume Reduction in cardiac output Loss of the atrial contraction to ventricular contraction