issue ▁with ▁a ▁lower ▁w avel ength ▁a ▁wave let ▁can ▁re - enter ▁within ▁a ▁smaller ▁volume ▁of ▁t issue . ▁A ▁shorter ▁ref ract ory ▁period ▁therefore ▁allows ▁more ▁wave lets ▁to ▁exist ▁within ▁a ▁given ▁volume ▁of ▁t issue , ▁reducing ▁the ▁chance ▁of ▁all ▁wave lets ▁simultaneously ▁ex ting u ishing ▁and ▁termin ating ▁the ▁arr h ythm ia . ▁ ▁Di agn osis ▁ ▁Short ▁Q T ▁synd rome ▁is ▁diagn osed ▁primarily ▁using ▁an ▁electro card i ogram ▁( E CG ), ▁but ▁may ▁also ▁take ▁into ▁account ▁the ▁clin ical ▁history , ▁family ▁history , ▁and ▁possibly ▁gen etic ▁testing . ▁ ▁Wh ilst ▁a ▁di agnostic ▁scoring ▁system ▁has ▁been ▁proposed ▁that ▁incorpor ate ▁all ▁of ▁these ▁factors ▁( the ▁Gol lob ▁score ), ▁it ▁is ▁uncertain ▁whether ▁this ▁score ▁is ▁useful ▁for ▁diagn osis ▁or ▁risk ▁strat ification , ▁and ▁the ▁Gol lob ▁score ▁has ▁not ▁been ▁univers ally ▁accepted ▁by ▁international ▁cons ensus ▁gu idel ines . ▁There ▁continues ▁to ▁be ▁uncertainty ▁regarding ▁the ▁precise ▁Q T ▁interval ▁cut off ▁that ▁is ▁should ▁be ▁used ▁for ▁diagn osis . ▁▁ 1 2 - le ad ▁E CG ▁▁ ▁The ▁main st ay ▁of ▁diagn osis ▁of ▁short ▁Q T ▁synd rome ▁is ▁the ▁ 1 2 - le ad ▁E CG . ▁ ▁The ▁precise ▁Q T ▁duration ▁used ▁to ▁diagn ose ▁the ▁condition ▁remains ▁controvers ial ▁with ▁cons ensus ▁gu idel ines ▁giving ▁cut offs ▁varying ▁from ▁ 3 3 0 ▁ms