<unk>  is an irregularity of the sinus rhythm defined as a variation in the P-P interval by 0.16 sec (160 msec) or more in the presence of normal P waves.  It is the most common type of<unk>  and it is classified mainly into respiratory<unk>  and non-respiratory<unk> .  While respiratory<unk>  is a normal variant that is mostly common in young and disappears with age, the non-respiratory<unk>  is most commonly present among elderly with heart disease.<unk>  occurs with slower heart rates or after enhanced vagal tone, and tends to disappear with increase in the heart rate. Triggers for<unk>  include sinoatrial block, sinus pause, premature atrial beat, carotid massage, and administration of parasympathomimetic medications.
Sinus arrhythmia
Wide complex tachycardia
Narrow complex tachycardia
Supraventricular arrhythmias
Ectopic atrial rhythm
Respiratory sinus arrhythmia
Ventricular flutter
Normal sinus rhythm