omission (ÉÊËmÉªÊÉn) or omittance n 1. something that has been omitted or neglected 2. the act of omitting or the state of having been omitted [C14: from Latin omissiÅ, from omittere to omit] oËmissive adj oËmissiveness n. oâ¢misâ¢sion (oÊËmÉªÊ Én) n. 1. the act of omitting. 2. the state of being omitted.
Causes of Heart block. Heart block is caused by certain medications, surgery and primary disease (an infection). A child can also be born with heart block (congenital heart block). Following is a list of causes or underlying conditions (see also Misdiagnosis of underlying causes of Heart block) that could possibly cause Heart block includes: 1  Heart attack. 2  Coronary artery disease. 3  Sinus node disease.  Congenital heart defect.
What Causes an Arrhythmia? An arrhythmia can occur if the electrical signals that control the heartbeat are delayed or blocked. This can happen if the special nerve cells that produce electrical signals don't work properly. An arrhythmia also can occur if another part of the heart starts to produce electrical signals.