Topic 10: VAD part 2

Question 1

Heartmate XVE

• • inner surface? which promotes what? limits what?
• • anitcoagulation?

Answer 1

Textured inner surface
Circulatory assistance without anticoagulation except an antiplatelet agent
Promotes pseudointimal layer
Limits thrombogenesis

Question 2

Heartmate XVE textured inner surface con?

Answer 2

CON: Immunologically active
Limit transplant candidacy due to increase in
immunologic reactivity.

Question 3

Heartmate XVE - is what type of pump? and how is it powered?

Answer 3

Positive displacement pump
Made of titanium with a polyurethane diaphragm and a pusher plate actuator (which is responsible for producing mechanical energy).
Powered pneumatically (emergency) or electrically

Question 4

Heartmate XVE - how do they cannulate?

Answer 4

Cannulate LV Apex (apical cannula)
Dacron conduit with 25mm porcine valve
Cannulate ascending aorta
20mm Dacron outflow graft with porcine valve

Question 5

Heartmate XVE
SV mL?
modes?

Answer 5

Stroke Volume–83mL

Fixed and Auto Modes

Question 6

Heartmate XVE

Auto mode?

Answer 6

Auto-SV maintained at 97% full

Flow–4-10 Lpm

Question 7

Heartmate XVE

Fixed mode?

Answer 7

Fixed–stroke volume depends upon filling
Rate is adjusted manually to keep stroke
volume between 70-80mL

Question 8

Heartmate XVE - Pneumatic (emergency)?

uses what? how?

Answer 8

Uses 9kg driver console
Small emergency hand pump
Actuates pusher plate via drive line

Question 9

Heartmate XVE - Electric Motor
how does it work?
vent?
when hand pump/pneumatic driver plugs in?

Answer 9

Rotates and displaces pusher plate
Air that is displaced by the diaphragm is vented to the atomosphere
Where the hand pump/ pneumatic driver plugs in.
Vent filter in place with electric motor operation.

Question 10

Heartmate XVE - battery power ?

Answer 10

4-7 hours - 2 batteries

external controller

Question 11

Heartmate XVE - Psuedointima

made of what and what does it do for the body?

Answer 11

Titanium microspheres and fibrillar textured surface
Promotes pseudointima
—-Composed of cellular elements, collagen, and cells derived from circulating progenitor cells.
—-Thin layer of biologic matrix that resists
thrombogenesis
—-Immunologically active microenvironment
(Heightened susceptibility to opportunistic
infections)