Table 1.

Pragmatic approach at VF and VT detection and ATP treatment in the broad ICD/CRT-D population (primary and secondary prevention of sudden death), based on evidence stemming from several clinical studies.^{8,10,12–18,31,33,34}

Primary and secondary prevention, ALL ICD types
Clinical setting	VT zone	VF zone	Detection duration	Discrimination	ATP for VT zone	ATP for VF zone
No structural heart disease, No VT substrate No fast SVTs		≥200 bpm	9–12 s (30–40 intervals)	None, apart Medtronic and NayaMed		During the charge or before charging 8 pulses, 85–88% RR interval
No structural heart disease, No VT substrate Known fast SVTs	200–250 bpm	≥250 bpm Setting as previous for Medtronic & NayaMed	9–12 s (30–40 intervals)	VT zone up to 230 bpm for Medtronic & NayaMed, SQICD	Single ATP 8 pulses, 85–88% RR interval	Debatable clinical usefulness, but possible during charge in Medtronic, NayaMed, Biotronik, St Jude Medical
Structural Heart disease, Possible VT substrate	170–200 bpm	≥200 bpm	9–12 s (30–40 intervals) VT detection>12 s	VT zone up to 230 bpm for Medtronic & NayaMed, SQICD	2 ATP burst*, 20 ms scan 8 pulses, 85–88% RR interval Single ATP ramp* 8 pulses 81% RR interval	During the charge or before charging* 8 pulses, 85–88% RR interval
Structural heart disease, VT < 170 bpm unresponsive to ablation/drugs	Dual VT 170–200 bpm 140–170 bpm	≥200 bpm	9–12 s (30–40 intervals) VT detection>12 s Slow VT > 60 s	VT zone up to 230 bpm for Medtronic & NayaMed, SQICD	Same as above for VT * 170–200 bpm Multiple individualized * ATP schemes for slow VT	During the charge or before charging* 8 pulses, 85–88% RR interval

* BIV ATP in CRT-D with ischemic heart disease.