26
a
Multiple shocks could demonstrate clinical deterioration or be ineffective.
Managing Alerts
Figure 7. Red and Yellow Alerts for PMs and ICDs
Red (critical) alerts
ICD Alerts
Device
Integrity
Alerts
Device
• Ventricular fibrillation
(VF) detection therapy off
• End of service/low battery
voltage
• Device reset/safety mode
• Long charge time
Lead
• Shock impedance out of
range
• RV pacing impedance out
of range
• Noise episode
Clinical
Alerts
Therapy
• Multiple shocks (≥2) delivered
a
Red (critical) alerts
Pacemaker
Alerts
Device
Integrity
Alerts
Device
• In PM-dependent
patients:
▶ Low battery voltage
▶ Device reset or in safety
mode
Lead
• In PM-dependent
patients:
▶ RV pacing impedance
out of range
▶ Noise episode
Clinical
Alerts
None
Red (critical) alerts
ILR Alerts
Device
Integrity
Alerts
None
Clinical
Alerts
Bradycardia
• HR ≤ 30 beats per minute
(bpm) (with complete
heart block)
• Asystole/pause ≥ 6 seconds
Tachycardia
• 30 beats > 231 bpm
Arrhythmias
• AF > 6 minutes in
cryptogenic stroke patients
