Sinus<unk>  is fairly uncommon.  It can be observed in the setting of myocardial disease (myocarditis) and ischemia or infarction (particularly acute inferior or posterior ST segment elevation MI).  It can be a manifestation of digitalis or lidocaine toxicity.
Sinoatrial arrest causes
Atrial flutter causes
Left bundle branch block causes
Supraventricular tachycardia causes
Sinus tachycardia causes
Sinus bradycardia causes
Right bundle branch block causes
Inappropriate sinus tachycardia causes