Transplants- Exam 2 Flashcards Preview

CV Perf Tech III > Transplants- Exam 2 > Flashcards

Flashcards in Transplants- Exam 2 Deck (82)
Loading flashcards...
1

What are the 3 types of transplants that perfusion is involvedin?

Heart transplants
Lung transplants
Liver transplants

2

Transplants can be performed individually or in combination often with what organ?

Kidney

3

Who described the first heterotropic transplant of a donor heart into the neck of a dog? When?

1905; Carrel and Guthrie

4

Describe the first heterotropic transplant of a donor heart into the neck of a dog.

Not a functional model, functioned together with the recipients heart; heart was not capable of supporting circulation, lasted 2 hours before the chambers clotted

5

Who won the Nobel Prize in Medicine and Physiology for work in this area? What year?

Carrell, 1912

6

What institution did Carrel and Guthrie create innovative surgical technique for vascular anastomoses?

University of Chicago

7

Describe the "Working Model" of the heterotopic transplant with circulatory unloading of the RV.

1933- Mann, et al. at Mayo Clinic
Lasted 4 days
Observed- failure of the transplanted heart was not always caused by faulty surgical technique but to "some biologic factor which is probably identical to that which prevents survival of other homotransplanted tissues and organs"; described acute allograft rejection

8

1960- Lower and Shumway

Orthotopic heart transplant in dogs with CPB and topical hypothermia for donor heart preservation; survived 6-21 days; died of rejection

9

When was Pharmcologic immunosuppression introduced?

1960s

10

What happened not long after pharmacologic immunosuppresion was introduced?

first clinical transplantation occured (kidney)

11

When was the first human heart transplant? Where?

1967, South Africa; followed shortly by Shumway and colleagues at Stanford in 1968

12

Many centers initially rushed to perform transplants. How come this didn't continue?

Realized post operative survival was limited
lots of opportunistic infections
graft rejections

13

When did most center discontinue doing transplants ?

in the 1970's

14

When did cyclosporine based immunosuppresion get introduced?

1980's; interest in transplantation re-emerged around this time

15

What patients are selected to get transplants?

Have to be in end stage CHF
Must be able to benefit from a transplant

16

How to determine end stage CHF?

NYHA function class III or IV
symptomatic refractory to management with medications, electrophysiology devices (pacemakers/AICD) and surgical intervention
LVEF < 35%
Cardiogenic shock (acute MI, acute myocarditis)
ischemic heart disease

17

Contraindications of transplants?

Advanced age (should be less than 65 y/o)
Irreversible pulmonary hypertension
Active infection and malignancy
Obesity
Diabetes
Pulmonary fibrosis, emphysema, hepatic and renal dysfunction, cerebral vascular disease, peripheral vascular disease (relative)

18

Contrainidications of transplants: Age

Should be less than 65 y/o
Can be done in older patients
physiologic age is a better indicator than chronologic age

19

Contraindications of transplants: Pulmonary HTN

complication of CHF with elevated LVEDP
Can create irreversible changes to pulmonary vasculature
could cause RV failure in new organ
PA systolic above 50-60 mmHg is not good
Give inhaled nitric oxide to prevent pulmonary htn

20

Contraindications of transplants: Active Infection and malignancy

infections are exacerbated by immunosuppression required after transplanation
Hepatits B, C, HIV not usually done
Non-melanoma cutaneous cancers, primary cardiac tumors restricted to the heart, low grade prostate cancers

21

Contraindications: Obesity

Impacts infection rates, wound healing, and have an increased incidence of acute rejection
BMI less than 30 kg/m2

22

Contraindication: Diabetes

Relative contraindication
Control of blood sugars on steroids and immunosuppressants
Wound healing

23

Contraindications: Psychosocial

Substance abuse (tobacco, alcohol)
Compliance with medications
Frequency of social support

24

What is done prior to performing a transplant?

Lots of tests/ workups are done prior to transplantation
Must be approved by several committees and departments prior to listing the patient

25

What is looked at for organ matching?

ABO Blood Compatibility
Overall body size (must be within 20% of body weight)
HLA Cross match
Priority on UNOS Registry
Geographic distance from donor

26

HLA Cross match

some patients are sensitized to antigen due to pregnancy, prior transplant, or blood transfusion

27

Waiting List Criteria

Status code and time within the status code
Highest medical urgency and lowest short term survival are assigned higher codes

28

How Wait List Works?

Offered to local status 1 patients first, status 1A before Status 1B.
No match? Offered to Status 1 patients within 500 mile radius.
No match? Offered to Status 2 local patients.
Repeat at 1000 mile radius and 1500 mile radius.

29

Going out for Procurement

Donor heart is arrested with cardioplegia/ preservation solution
Atria are transected at the midatrial level (leave multiple pulmonary venous connections to the LA intact)
Transect the aorta and PA just above the semilunar valves
Heart is cooled topically

30

What is the ischemic time?

3-4 hours!! can do up for 5-6 hours- not idea