Syncope in a pacemaker patient, uh oh...

Type de tracés: 
EGM
Prothèse: 
PM
Constructeur: 
Medtronic

Patient in her sixties had a dual chamber pacemaker implanted in 2015 because of brady-tachy syndrome.

She experienced a syncope and had her pacemaker interrogated at the first heart aid. Below is the EGM during syncope. 

What is the arrhythmia?