sinus arrhythmia; irregular heartbeat
Medical term for an irregular heartbeat originating from the sinus node. In everyday contexts, simply 不整脈 is more common.
I was diagnosed with sinus arrhythmia at my health checkup.
Sinus arrhythmia can sometimes be seen even in young people.
不整脈 is the general term for arrhythmia, while 洞性不整脈 specifies that the irregularity originates from the sinus node.
Compound of 洞性 (sinus, from 洞 'cavity' + 性 'nature') and 不整脈 (arrhythmia, from 不 'not' + 整 'regular' + 脈 'pulse').