Could pericardial effusion cause a heart block?

Pericardial effusion: Pericardial effusion most commonly is associated with faster heart rates as tachycardia compensates to maintaini cardiac output when there is restriction to ventricular filling as there is in large effusions. If the effusion is small, heart rate is likely unaffected. Depending on the cause of the effusion, however, heart block could occur (hypothyroidism), or if vagal reaction occurs.

Peicardial effusion: Pericardial effusions can be small and not hemodynamicallly significant (inflamed lining) and in such cases they cause pain mostly. If effusion is large and prevents filling of the heart, low BP results. It can occasionally be assorted with slow heart rates (example hypothyroidism), or. When vagal reflexes are stimulated.