61HeartWare™ HVAD™ System Pump
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Appendix
Reference
Guides
Alarms and
Emergencies
Patient
Management
Surgical
Implant and
Explant
Monitor
Peripherals
and
Accessories
HVAD
®
PumpOverviewIntroduction
3.2 Physiologic Control Algorithms (continued)
3.2.2 [Ventricular Suction Detection] Alarm (continued)
The Suction Response “Alarm” mode must not be turned on if the patient is in a suction
condition. If the mode is turned on during a suction condition, the “Sx On” message will be
displayed on the monitor and the [Ventricular Suction Detection] alarm will be enabled but will
be inaccurate due to the fact that normal baseline parameters could not be established during
a suction condition. The algorithm attempts to establish a baseline detection level to distinguish
abnormal conditions. This is not possible if the patient is experiencing ventricular suction when
the algorithm is initiated. Once the suction condition clears, an accurate baseline will be
obtained automatically and the suction detection will proceed.
If a [Ventricular Suction Detection] alarm is triggered, the clinician should evaluate whether
the alarm was triggered by a transient, reversible condition which corrects itself, or whether the
alarm is more serious and requires intervention. Transient alarms often occur at certain times
during the day and/or under particular circumstances such as bending over or lying on one
side. They usually resolve quickly without problems. If the [Ventricular Suction Detection] alarm
hypotension, or if a [Low Flow] alarm is active, then the patient should be evaluated. This can be
if necessary, by visualizing the left ventricle with echocardiography. The clinician should
attempt to identify and treat the underlying cause of the suction event. If the cause for the
suction event cannot be determined, or if the cause is refractory to treatment, then the
clinician should manually adjust the speed to resolve the suction condition. Manual changes
to the speed will immediately disable the [Ventricular Suction Detection] alarm. An “Sx Off” will
be displayed on the monitor screen below the “Fixed” Mode display. The clinician will have to
reactivate the alarm after adjusting the speed.
CAUTION: Manual changes to the speed will immediately disable the [Ventricular Suction Detection]
alarm. An “Sx Off” will be displayed on the monitor screen below the “Fixed” mode display. The
[Ventricular Suction Detection] alarm will have to be re-activated.
CAUTION:
condition. To optimize operation of the suction detection the patient should be hemodynamically
stable prior to enabling the [Ventricular Suction Detection] alarm.
NOTE: Ventricular suction detection may be activated once the patient’s intravascular volume and
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