|
20
|
IAB Insertion / CARDIOSAVE Operation
|
Cardiac Assist
|
timing Errors
Early Inflation
Inflation of IAB prior to aortic valve
closure.
Waveform characteristics
•
Inflation of IAB prior to dicrotic notch
•
Diastolic augmentation encroaches onto
systole (may be unable to
distinguish)
Physiologic Effects
•
Potential premature closure
of aortic valve
•
Potential increase in
LVEDV/LVEDP/PCWP
•
Increased left ventricular wall
stress or afterload
•
Aortic regurgitation
•
Increased MVO
2
demand
Late Inflation
Inflation of IAB markedly after closure
of aortic valve.
Waveform characteristics
•
Inflation of IAB after dicrotic notch
•
Absence of sharp “V”
•
Sub-optimal diastolic augmentation
Physiologic Effects
•
Sub-optimal coronary artery
perfusion
Unassisted
Systole
Assisted
Systole
Diastolic
Augmentation
Dicrotic
Notch
Unassisted
Systole
Assisted
Systole
Diastolic Augmentation
Dicrotic
Notch
Aortic
Valve
Closure
CARDIOSAVE
OPERATION