Title: Lung Transplant
1Lung Transplant
2CASE
- You are currently the fellow working at VGH and
as you come in Monday morning the charge nurse
tells you that there are several transplants
going on today including a lung transplant and
that we are holding a bed. You have several
resident working with you that are very excited
and they start firing questions off.
3CASE
- What diseases are currently we doing lung
transplants for? - Alpha1-antitrypsin
- CF
- COPD
- IPF (UIP and occ NSIP)
- IPAH (including Eisenmengers)
- Sarcoidosis
4(No Transcript)
5CASE
- What are the general goals for determining the
appropriateness of a lung transplant in a
individual patient?
6General Principles
- Need to consider the natural history and
prognosis of primary disease and weigh against
projected survival post transplant. - Ultimate goal
- Obtain max mileage from native lung, conferring a
greater overall survival time with new lung. - Avoiding death on the waiting list.
7General Principles
- Consider quality of life while on waiting list
compared to quality of life with new lung. - Traditionally, looked at the median 2-year
posttransplant survival rate and compared this to
projected survival with underlying condition. - When formerlonger.patients are transplant
candidates.
8General Principles
- 2 year survival rate is not arbitrary number. Two
reasons why used. - Average waiting time is around 2 yrs.
- Based on disease the first month mortality varies
greatly. - ..but then the mortality decreases relatively
linearly. This will compensate for this.
9CASE
- Do the survival rates for different diseases vary
post transplant? What is the generally quoted
first month mortality?
10CASE
First month mortality quoted as 7 to 24
11CASE
- Which diseases are thought to have the greatest
survival advantages? Which diseases are
questionable?
12Survival advantage?
- Use of time-dependent, nonproportional hazard
models, equity points, and crossover points. - Survival benefit demonstrated with
- CF
- IPF
- IPAH
- Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004
13Survival advantage?
- However, also raised questions about any survival
benefit for px with - COPD
- Eisenmener syndrome
- But in addition to survival, quality of life also
needs to be taken into consideration. - ie) COPD px changes in quality-adjusted
life-years may be sufficient to justify
transplantation.
14Survival advantage?
15CASE
- What are the indications for lung transplantation
for these various diseases based on the ATS 1998
consensus statement?
16Indications
- COPD
- FEV1lt 25 (without reversibility)
- And/or PaCO2 gt55 and/or elevated PAP with
progressive deterioration - Preference to those px with
- elevated PaCO2 with progressive deterioration
- require long term oxygen therapy.
- Nathan et al. Lung Transplantation
Disease-Specific Considerations for referral.
Chest 20051271006-1016
17Indications
- Interestingthe level of subjective dyspnea my
be a better predictor of mortality than FEV1. - ie) grade IV dyspnea stopping to take a breath
during 100 yrd walk. - - median survival of 3 yrs, which is comparable
to 3 yr posttransplant survival rate (61) - In contrast, FEV1lt35 pred had a median survival
of 5 yrs.
18Indications
- Currently several other models being investigated
which incorporate a number of diff parameters
such as the BODE index. - Body weight, Obstruction, Dyspnea level, Exercise
tolerance. - Score out of 10.
- 7-1080 mort at 52 months (transplant cand)
- lt7 5 yr mort of lt50 (not transplant cand)
19Indications
- IPF
- Divided now into UIP and NSIP
- UIPWhen diagnosed should be referred!!!
- Traditionally, break points at FVC of 60-70 and
DLCO of 50-60 are indicative for poor outcome.
Very inconsistent.
20Indications
- Other models look at DLCO and HRCT scan to help
predict mortality (May see in future!) - Also, one of the most sensitive markers may be
desaturation to less than 89 during a 6 min
walk. - If able to maintain sats may be able to defer
transplant referral.
21Indications
- NSIP
- True NSIP have much better prognosis and majority
will not need transplant. - Subgroup which may require include
- 1) DLCO lt35 and/or a dec in DLCO of gt15 have
shown to have mortality similar to UIP with
median survival of 2 yrs.
22Indications
- CF
- FEV1 lt30 or
- Rapid progressive resp deterioration with FEV1
gt30 (inc hosp, rapid fall in FEV1, massive
hemoptysis, inc cachexia) - Room air PaCO2 gt50 or PaO2 lt55.
- Woman whose condition is deteriorating rapidly.
23Indications
- IPAH
- Medical management has improved greatly.
- 1990 10.5 of all lung transplants.
- 20013.6 of all lung transplants.
- Should exhaust all medical management before
consider transplant.
24Indications
- NYHA class III or IV after 3 months of IV
epoprostenol have 2 yr survival of 46 and should
be considered for transplant. - NYHA class I and II 93 and not candidate.
25Indications
- Sarcoidosis (common disease, rare transplant)
- In 1998 guideline no official recommendation.
- Need to have stage IV. Advanced fibrotic
changes, honey-combing, hilar retraction, bullae,
cysts, and emphysema. - Also reasonable when FVClt50 and/or FEV1 lt40.
26CASE
- After you clearly describe the answers to the
above questions your staff speaks up and asks you
if you are familiar with the Lung Allocation
Score (LAS). - What is the LAS? Why was it designed?
27LAS
- In Canada we determine how organs or allocated
by - Size of patient
- ABO matching (Not HLA matching)
- Time on the list.
- Kozower et al. The impact of the lung allocation
score on short-term transplant outcomes A
multicenter study. J thorac Cardiovasc Surg
2008135166-77
28LAS
- In the US
- Organ procurement and transplantation network
(OPTN) began allocating lungs in 1990 based on
size, blood type and amount of time candidate had
spent on waiting list. - 1995, minor change when 3 months credit given to
IPF px to offset their inc mortality. (Not done
in Canada) - To better list px according to medical urgency
and expected benefit the LAS was developed.
29LAS
- Developed by multivariate modeling and approved
by OPTN in 2004. Implemented in May 2005. - Three main objectives are
- Reduce deaths on transplant list
- Inc transplant benefit for lung recipients
- Ensure efficient and equitable allocation of
organs
30LAS
- Gives a score between 1-100.
- Weighted combination of predicted risk of death
during the following year on the waiting list and
the predicted likelyhood of survival during the
first year after transplant.
31CASE
- Is there any evidence that it is working?
32- First year of implementation compared to previous
year. - 170 in each group.
- Dec in waiting times (680 to 445 days).
- Dec death on waiting list (74 to 5130)
- Determined that there was a switch with inc in
IPF px and dec in COPD and CF. - Inc in primary graft dysfunction (14.1 to 22.9).
- Inc in ICU stay (5.7 to 7.8 days).
- Hosp mort and 1 yr survival were similar.
33- Concluded that the LAS is doing what it was
designed to do. - Reason why inc in PGD is likely due to higher
number of retransplants and IPF which both are
established risk factors for PGD. - When controlled for Dx, the rates of PGD were no
longer different. - This also explains the inc in ICU stay, mech
vent. - Most important..no change in mortality.
34Donor criteria?
- Less than 20 of organ donors possess lungs
suitable for transplantation
35- Age lt40 years (heart-lung), lt50 years (lung)
- Smoking history less than 20 pack-years
- Arterial partial oxygen pressure of 140 mm Hg on
a fraction of inspired oxygen (FIO2) of 40 or
300 mm Hg on an FIO2 of 100 - Normal chest x-ray Sputum free of bacteria,
fungi, or significant numbers of white blood
cells on Gram and fungal staining - Bronchoscopy showing absence of purulent
secretions or signs of aspiration - Absence of thoracic trauma
- Human immunodeficiency virus negative
36CASE
- You learn that the patient is a 58 yo male with
severe COPD. Other PMHx includes a NSTEMI 8 yrs
prev, HTN, hypercholesterolemia. Pre-op ECHO
results show good biventricular fxn with PAS33
mmHg via TRJ. Pre-op cath results show clean
coronaries and right heart cath confirms the
right sided pressures. Preop PFT show a PEV1 of
25 and moderate to severe airtrapping. They are
doing a single right lung transplant and no plan
for bypass.
37CASE
- 8) How is the choice for a single vs a double
lung transplant made? In what situations is a
double lung preferred?
38Single vs Double?
- Based on numerous factors such as
- Disease
- Age
- Comorbidities
- Institutional biases
- Organ availability
- Emergency of procedure
39Single vs Double?
- Majority done in Canada are single lung
transplants. - First isolated single lungs were done for
pulmonary fibrosis and this continues to be the
norm. - COPD originally thought not possible to receive
single lung transplants. - First done in 1989 by Mal and colleagues
- Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004
40Single vs Double?
- Currently a standard throughout the country.
- Specifically, in COPD if px is of shorter stature
and older do better. - Pulmonary HTN single or double but if choose
single expect to have more difficulty in first
few days. Many centers mandate only bilateral. - Bilateral transplants are mandatory for px with
CF and bronchiectasis. - Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004
41Single vs Double?
- Bilateral lung transplants for mycetomas or other
chronic fungal or mycobacterial infections - Many larger centers are now favoring bilateral
transplants. Specifically the Duke University
Medical Center. - Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004
42Single vs Double?
- Feel do not exclude other patient in many cases.
- If single lung is marginal for transplant,
taking both will provide adequate function. - Early post-op management is easier with bilateral
43Single vs Double?
- Additionally, in 225 px who survive 6 months.
- Single lung transplant (as compared to bilateral)
was a significant risk for BOS in multivariate
Cox model (HR2.08, p0.001) - ? If immunologic advantages of bilateral ?
- Hadjiliadis D et. al. Chest 20021221168-1175.
44Single vs Double?
- A recent review of the United Network of Organ
Sharing lung transplant database of 2260
transplants for emphysema compared single vs
double lung transplants. - No difference in 30 day mortality but long term
survival data favored bilateral lung transplants
for individuals lt60 yrs of age. - Bilat were older and more women. ? How to
interpret? - Meyer et al. J heart Lung Transplant
200120935-941.
45Case
- 9) In what situations will a lung transplant be
done on bypass? Why if done on bypass is it
relevant to post-op management?
46Bypass?
- Most adult transplants can be done without CPB.
A number of specific situations will necessitate
CPB. - Primary or secondary pulmonary htn are most
safely done on bypass. - Px with CF likely have such voluminous purulent
secretions that independent ventilation is
impossible. - During bilateral transplant early graft dysfxn of
the first transplanted lung (reperfusion)
preventing single lung vent. - If native lung is unable to sustain patient with
single lung ventilation.
47Bypass?
- Why relevant to post-op care?
- 1) If get significant PGD it is unlikely the
patient can be supported on single lung
ventilation. - 2) Bypass is a significant risk factor for PGD!!
- Most recent large study by Dalibon, which
reviewed 140 LT, confirmed that CPB was
associated with longer MV, more pulm edema, more
transfusions and inc early mortality!! - Dalibon et. al. J Cardiothorac Vasc Anesth
200620668-672.
48CASE
- You hear that the case is finishing up. There
was minimal surgical difficulty the lung was
implanted using continuous 3/0 polypropylene
sutures for the bronchial anastomosis
(end-end-technique), continuous 4/0 polypropylene
sutures for the pulmonary vein to left atrial
anastomosis, and continuous 5/0 polypropylene
sutures for the pulmonary arterial anastomosis.
49CASE
- Unfortunately you hear that they need to do the
case on bypass as they were unable to do the
transplant on single lung ventilation. The
overall ischemia time was 6 hours and 8 minutes
for the lung. The post-transplant bronch looked
pristine and the TEE looked good. The patient is
brought to ICU post-op stable on AC and FIO2 of
100 and quickly weaned to 80. CVP12 CI3.5,
PA40/18. (If the nurse said the PAWP16what
would you say??)
50CASE
- 10) Generally what ventilator settings would you
like post transplant px to be on? What about
this patient? What is your general plan to wean
the ventilator?
51Ventilation?
- Many centers prefer a PC ventilation so as to
limit peak airway pressures (lt40) and prevent
barotrauma to the brochial anastomosis. - Plat pressure should additionally be limited to
less than 30 to 35 mmHg. - Minimize Fio2 as quickly as possible.
- Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004 -
52Ventilation?
- This patient?
- Due to the very compliant native lung with
potential for air trapping and the relatively
stiff transplant lung.need to be aware of
balance. - To begin, as long as oxygenation is not a issue.
Ventilation as if to prevent air trapping in
native lung. - Min PEEP, adequate expiratory phase with PC. Can
still use EEP to determine if airtrapping. - Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004
53Ventilation?
- Generally want to get off the ventilator as soon
as possible. - Use adequate analgesia via epidural or
paravertebral (recent metaanalysis and found
paravertebral block had lower rate of resp
complications and side effects) .wake and wean. - If have standard PS weaning protocol it should be
used as usual. - Plan to have extubated in 24 to 48 hrs ideally!
- Davies et. al. Br J Anaesth 2006 96418-426.
54CASE
- 11) Generally discuss your fluid management post
op. What variables are you balancing with your
fluid management?
55Fluid Management
- Careful fluid management is necessary to avoid
substantial transplant lung edema. - Usually aim for a negative fluid balance from the
get go. Def aim for negative balance in the
first 48hrs. - Minimal fluid and if require volume use colloid
or blood. - Some centers will target a CVP of lt7 mmH20, with
systemic perfusion supported by pressors. - Pilcher et. al. A high CVP is associated with
prolonged mech vent and inc mortality following
lung transplantation. J Thoracic Cardiovasc Surg
2005129912-918.
56Fluid Management
- Retrospective study of 118 px.
- After controlling for CV diz and vasopressors,
CVP was correlated with duration of MV, with a
CVP gt7 also being associated with higher ICU and
hosp mortality. - Unclear whether a strategy aimed at keeping CVP
less than 7 would alter outcome or if a marker of
severity of illness. - Pilcher et. al. A high CVP is associated with
prolonged mech vent and inc mortality following
lung transplantation. J Thoracic Cardiovasc Surg
2005129912-918.
57Fluid Management
- Obviously need to balance against the risk of
renal insufficiency. - Many of these patient my have CRF.specifically
the CF px. (why?). - Additionally cyclosporine or tacrolimus may
impair renal fxn. Watch levels closely post-op.
- Titrate volume to u/o. Previous many centers
still using renal dose dopamine in this
setting. No evidence.
58CASE
- 12)Although our patient remains hemodynamically
stable. Why is shock in these patients need to
be quickly identified and diagnosed?
59CASE
- These patients should not be shocky!!
- NEED TO MAKE DIAGNOSIS (Dr George
Isac) - Bleeding? Anastamosis?(watch CTs and hgb)
- Obstructive? Anastamosis?
- Cardiogenic?
- Infection/sepsis?
60CASE
- Judicious resuscitation (colloid) and
vasopressors - STAT ECHO (TEE)
- Notify the Surgeon
- ? Mobilize ECMO early?
- Is their a benign reason why they may be
requiring increasing vasopressor support?
61CASE
- After initially settling the patient in and
continuing on your rounds the RT approaches you
and states that the FIO2 requirements are back up
to 100 after a brief period at 50 and hypoxia
is becoming an issue. A stat CXR was done.
62CASE
63CASE
- 13) What is your differential for early
respiratory failure in the lung transplant? What
are the risk factors for early respiratory
failure?
64Early Respiratory Failure
- DDx
- Reperfusion injury (55)
- Periop cardiovascular(MI, arrhythmia, CHF)
/haemorrhagic (36) - Anatomic complications
- Infectious (bacterial and CMV)
- Rejection (hyperacuterare and acutecommon)
- Pneumothorax
- PE
- Chatila el. al. Resp failure after lung
transplant. Chest 2003123165-173.
65Early Respiratory Failure
- Risk factors
- Preop pulmonary htn
- Rt vent dysfunction
- Prolonged ischemic time
- CPB
- Chatila el. al. Resp failure after lung
transplant. Chest 2003123165-173.
66CASE
- 14) Briefly describe Reperfusion injury, Primary
Graft failure. What can we do to help prevent
Reperfusion injury before and after the
transplant? How do you manage it? (specifically
in our patient?)
67Ischemia-Reperfusion Injury
- Typically manifests in the first 72 h after
transplant. - Development of airspace disease, progressive
hypoxemia, and inc in pulmonary pressures
(reflective both epithelial and endothelia
injury) - When PaO2/FiO2 ratio below 200, termed primary
graft failure. - Granton, J. Update of early resp failure in the
transplant recipient. Current Opinion in Critical
Care 20061219-24.
68Ischemia-Reperfusion Injury
- Recent 2004 publication identified several risk
factors - CPB
- BMI gt25kg/m2
- Immediate elevated PAS
- Trend in oxygenation index over 24hrs
- Elevated APACHE II
- Sekine et al. J Heart Lung Transplant
20042396-104
69Ischemia-Reperfusion Injury
- Additionally, a review of 7 French transplant
centers and 752 px over 12 yrs. - Found graft ischemic time associated with the
PaO2/FiO2 ration measured at 6 hrs. - 30 day mortality was associated with a lower
PaO2/FiO2 ratio at 6 hrs. - Identified cold ischemic time of 330 min (5.5hr)
as distinguishing between px who had a
uncomplicated course vs those who did not. (Max
accepted is 6-8hrs) - Thabu et al. Am J Respir Crit Care Med
2005171786-791. - Oto et al. J Thorac Cardiovasc Surg
2005130180-186.
70Ischemia-Reperfusion Injury
- Ischemia-Reperfusion Injury also associated with
long-term consequences. - Retrospective cohort study of 255 LT px.
- Christie et al reported a 30 day mort of 63.3
compared to 8.8 in px with and without
reperfusion injury. - Median hosp was longer (47 vs 15 days)
- Mech vent longer (15 vs 1 day)
- Lower exercise capacity as assessed by 6 min walk
distance at 12 months. - Christie et al. Chest 2005127161-165.
71Ischemia-Reperfusion Injury
- Pathogenesis
- Variety of perturbations implicated.
- Factors relating to
- Donor
- Method of graft preservation
- Effects of reperfusion following period of
ischemia
72Ischemia-Reperfusion Injury
- The Lungs may be made susceptible from
cytokine-mediated damage in px with elevated ICP
and compounded following cold preservation of the
grafts. - De Perrot et al. Am J Respir Crit Care Med
2003167490-511
73Ischemia-Reperfusion Injury
- How can we help prevent ischemia-reperfusion
injury? - Can divide into
- Pre-transplant interventions
- Peri-surgical interventions
- Post-surgical interventions
74Ischemia-Reperfusion Injury
75Ischemia-Reperfusion Injury
- Pre-Surgical interventions
- Preservation solutionspecifically a
low-potassium dextran solution provides superior
preservation over high potassium preservation
solutions. - In addition, nitric oxide added to the flush
during harvest provides a preservation advantage.
(not well studied) - Maccherini et al. Transplantation.
199152621-626 - Yamashita et al. Ann thorac Surg. 199662791-797
76Ischemia-Reperfusion Injury
- It is known that lung hyperinflation is a
excellent model of pulmonary edema.therefore
care should be taken to avoid during harvest and
storage.
77Ischemia-Reperfusion Injury
- Peri-Surgical interventions
- Lick and colleagues reported a small series where
using leukocyte-filtered modified perfusate is
pumped through the lung at time of reperfusion.
In case report.no ischemia-reperfusion injury. - Lick et al. Ann Thorac Surg. 200069910-919
78Ischemia-Reperfusion Injury
- Post-surgical interventions
- TP-10 inhibitor
- - One of few randomized trials in lung
transplantation, using soluble complement
receptor-1 inhibitor led to reduction in duration
of mech vent. - - Interestingly, greatest effect in px who
received bypass.
79Ischemia-Reperfusion Injury
- NO
- Early preclinical and uncontrolled reports
suggested that admin of NO either prior to or
shortly after reperfusion injury could dec
severity of disease. - Recent controlled clinical trial failed to show
benefit when inhaled 10 min after reperfusion. - Meade et al. Am J Respir Crit Care Med
20031671483-1489.
80Ischemia-Reperfusion Injury
- NO
- Another recent trial by Perrin.
- RCT in 30 bilateral lung transplants.
- 20 ppm iNO at time of reperfusion vs control.
- Could not identify any reduction in extravasular
lung water (p0.61) or improvement in gas
exchange (p0.61). - Future studies needed.
- Perrin et al. Chest 20061291024-1030
81Ischemia-Reperfusion Injury
- ICU management
- Adoption of lung protective strategy would seem
reasonable. (only one rat study has actually
looked at this). - In refractory hypoxemia use of inhaled NO, HFO
and ECMO may improve gas exchange. - Granton, J. Update of early resp failure in the
transplant recipient. Current Opinion in Critical
Care 20061219-24.
82Ischemia-Reperfusion Injury
- What about our patient??
- In COPD single lung Tx that develop reperfusion
injury.dilemmas may arise. - As px becomes hypoxic and more aggressive
vent/peep strategies are used.may overdistend
native lung. - Cause shunting of blood to dysfunctional
allograft. - Futhermore, if worsens still, mediastinal shift
may result in impaired venous return.
83Ischemia-Reperfusion Injury
- Better to minimize tidal volumes and lowest PEEP
to gain acceptable oxygenation and accepting mild
respiratory acidosis (/- novalung??) - Place px in lateral decubitus with transplant
side up, and aggressive chest physiotherapy. - If this fails.should consider independent lung
ventilation. - Be aware that will be more difficult to clear
secretions and the ease with which the tube may
be dislodged. - Gavazzeni et al. Chest. 1993103297-299.
84Prediction of Independent Lung Vent.
- Prediction of need for single lung ventilation?
- Study looking at 170 px who had single lung
transplant for COPD. - 12 required independent lung ventilation.
- Similar in age, sex, ischemic time, and donor
characteristics to those who required
conventional ventilation. - Pilcher et al. Predictors of independent lung
ventilation an analysis of 170 single-lung
transplantations. Pilcher J Thorac Cardiovasc
Surg. 2007 Apr133(4)1071-7
85Prediction of Independent Lung Vent.
- Patients receiving independent lung ventilation
had a greater degree of - Preoperative airflow limitation (FVC1/FVC)
- More hyperinflation
- Lower postoperative PaO2/fraction of inspired
oxygen ratios - More radiologic mediastinal shift
- More transplant lung infiltrate on the
postoperative chest radiograph.
86Prediction of Independent Lung Vent.
- Multivariate logistic regression analysis showed
that independent lung ventilation was associated
with - Increasing levels of recipient hyperinflation
(percentage total lung capacity compared with
predicted value odds ratio 1.04P .032) - Reduced early postoperative PaO2/fraction of
inspired oxygen ratio (odds ratio 0.96 P .005)
87Prediction of Independent Lung Vent.
- Length of ventilation and intensive care unit
stay and mortality were higher in the independent
lung ventilation group. - Among patients who survived to hospital
discharge, there were no differences in long-term
mortality between the 2 groups.
88Prediction of Independent Lung Vent.
- Conclusions Independent lung ventilation
predicted by the combination of - Increased hyperinflation measured on recipients'
preoperative lung function tests - Low PaO2/fraction of inspired oxygen ratio,
indicating graft dysfunction in the immediate
postoperative period.
89Prediction of Independent Lung Vent.
- Another study looking at predictors of native
lung hyperinflation. - Retrospectively analyzed data from 27 patients
who underwent 31 single lung transplantations for
emphysema. - Two groups
- 12 patients with development of acute or chronic
NLH - 15 patients without development of hyperinflation
- Yonan. Single lung transplantation for emphysema
predictors for native lung hyperinflation. J
Heart Lung Transplant. 1998 Feb17(2)192-201
90Prediction of Independent Lung Vent.
- NLH was defined as
- Radiologic mediastinal shift with
- Flattening of the ipsilateral diaphragm
- Associated with respiratory dysfunction or
hemodynamic instability
91Prediction of Independent Lung Vent.
- No differences between the two groups regarding
- age
- preoperative partial pressure of oxygen
- partial pressure of carbon dioxide
- acid-base status
- donor lung size and physiological structure
- side of transplantation
- primary pathologic condition
- rejection score
- infection episodes and obliterative bronchiolitis
in the transplanted lung after operation.
92Prediction of Independent Lung Vent.
- Patients with NLH had
- Significantly higher preoperative mean pulmonary
artery pressure gt 30 mm Hg. - Lower mean FEV1.
- Higher mean residual volume.
93CASE
- A quick in and out bronch shows no anatomic abn
and on TEE the pulmonary veins look good. After a
short period of time you realize that he is
deteriorating that the hypoxia is quickly
becoming refractory. You quickly mobilize ECMO
and after a short time on ECMO the patient
stabilizes. - 15) Your staff asks you if you know of any
evidence for the use of early ECMO in these
patients?
94ECMO
- Several publications looking at ECMO in this
situation. - In the setting of pulmonary htn (high risk),
early ECMO has been advocated (experience based). - Another review of 17 cases
- ECMO may preserve initial organ function due to
reduction in use of injurious ventilation
strategies. - Dahlberg et al. J Heart Lung Transplant
200423979-984. - Pereszlenyi et al. Eur J Cardiothorac Surg
200221858-863.
95ECMO
- More recent publication by Oto at Alfred Hosp in
Melbourne. - Ten transplant recipients from total of 481
(2.1) were treated with ECMO. - Prior to initiation had TEE to exclude lung
torsion and pulmonary vasc prob, and a
retrospective crossmatch to exclude humoral
rejection.
96(No Transcript)
97ECMO
Initiate 21 days (7-40days)
Initiated after 0-2 days
98ECMO
99(No Transcript)
100CASE
- One of your keen residents asks if there is
anyway this could be acute rejection? Are there
any definitive tests to prove this is not
rejection?
101Biopsy!!
- Patients with acute rejection can also have
alveolar infiltrates, hypoxemia and systemic
inflammatory response syndrome. - To rule out hyperacute rejection can do a
retrospective crossmatch. - For longer term observation pathologic assessment
of multiple transbronchial biopsy specimens has
proven to be the gold standard. - Debate between transbronchial and surgical
biopsy. - Trulock et al. Chest. 19921021049-1054.
102Open Lung Biopsy
- In 2003 Burns et al looked at 41 patients on mech
vent with questionable acute rejection that
received transbronchial and open lung biopsy. - Surgical biopsy inc dx of rejection by 33 and
treatment changes in 15 of the 41. - Currently unresolved debate as previous studies
contradicted this finding. - Burns et al. J Heart Lung Transplant
200322267-275.
103(No Transcript)
104Open Lung Biopsy
- The risk of open lung biopsy must be weighed
against the risk of simple empirical therapy for
rejection after exclusion of infection. - Given the consequences of intensification of
immunosuppression in the intubated, critically
ill px, open lung biopsy may be justifiable.
105CASE
- Now that the possibility of rejection has been
brought up..what are the different types of
rejection? How are they treated?
106Rejection
- Hyperacute- humoral based with preformed
antibodies to the allograft vascular endothelium - - Only anecdotally reported in the literature
with lung transplant. - Cellular immune based rejections
- Acute
- Chronic/bronchiolitis obliterans syndrome (BOS)
107Rejection
- Standard immunosuppressive management
- Triple drug combocyclosporin, imuran,
prednisone. - Methylprednisolone intraop and first 24 hrs. Then
steroids suspended for 2 weeks, based on
experimental and clinical evidence they impede
bronchial anastamotic healing. - Then oral pred started.
- Some evidence tacrolimus/imuran/steroid may be a
better combo. (acute and chronic rejection)
108Rejection
- Acute
- Most common complication following lung
transplantation. - Most recipients experience at least 1 episode in
first year. - It is clear that there is a association between
frequency and severity of acute rejection and
subsequent dev of BOS.
109Rejection
- Thus, early detection and alteration of
immunosuppression may have a significant impact
on subsequent reduction of BOS. - S/S
- Fever
- Dyspnea
- Dec PaO2
- Fall in vital capacity
- Infiltrates.
110Rejection
- After first postop month, CXR freq normal during
episode of acute rejection. - Obviously, infection can present similarly.
- Need to distinguish with transbronch biopsy and
BAL. - Tx
- Methylprednisolone 10-15mg/kg for 3-5 days.
- 2-3 weeks of oral steroid taper.
111Rejection
Some work by Loubeyre et al, that may be able to
use HDCT to Dx acute rejection and avoid TBB (65
sens for rejection, 85 specific for acute lung
complication.
112Rejection
- Maintenance immunosuppression regimen should also
be scrutinized. - First adjustment from maintenance cyclosporine is
a switch to tacrolimus in event of cyclosporin
toxicity or acute rejection episodes despite
adequate cyclosporine dosage. - Newer agents such as sirolimus, leflunomide may
be used more in future.
113Rejection
- Chronic/bronchiolitis obliterans syndrome(BOS)
- 70 of graft recipients are dx by 5th year.
- Usually presents as a late decline in FEV1 from a
post-op baseline. - Pathologic lesion is broncholitis obliterans.
114Rejection
- Risk Factors
- Episodes of acute rejection
- Primary Graft dysfunction
- CMV pneumonia
- Noncompliance with meds
115Rejection
- Causes not totally clear.
- Evidence suggests both alloimmune and
non-alloimmune mech are important (for example
GERD). - There is evidence that fundoplication will lower
BOS scores and even eliminate it in certain
individuals - Cantu et al. Ann THorac Surg 2004781142-51
116Rejection
- Diagnosis- two approaches (definitive proof and
diagnosis of exclusion)
117Rejection
- Treatment (no well established protocol)
- Conversion from cyclosporin to tacrolimus may
stabilize progression. - ?addition of mycophenolate may be benificial.
- ?sirolimus
- ?azithromycin daily is currently being
investigated and may show promise. - Retransplantation?
118CASE
- 17)Could this be infectious? Where in the
complications timeline to infectious etiologies
usually fit? Are there any exceptions?
119Infection post transplant
- Unlikely in this scenario.
- But infection is one of the leading causes of
morbidity and mortality. - Immediate post-op bacterial are the greatest
threat. - But candidia or aspergillus or viral (herpies or
CMV) can also arise. - Lung transplant procedure and postoperateive
management. 2008 Uptodate.com.
120(No Transcript)
121Bacterial
- Most common pathogen are those that colonized the
donor or recipient. - Gram neg such as Pseudomonas, Klebsiella and H.
flu are most common. Gram positives (staph) are
also a frequent cause (head injury). - Most centers use a 7-10 day prophylaxis (eg
vanco, cefepime) or depending on previous
colonization. - We use generally use ceftaz and clox till lines
and drains are out.
122Viral
- CMV is most commonly seen infection post-op
complication (13-75 of transplants). - Most risk obviously in CMV neg recipient
receiving CMV pos donor. - Optimal prophylaxis remains controversial.
- Most centers will supply 12 weeks of IV
gancyclovir (5 mg/kg qd) for D/-R and CMV
immunoglobulin. - If just R get only gancyclovir for 12 weeks.
- If D/-R nothing.
123Viral
- Patients in the community are also susceptible to
other viral infections (eg. RSV, adenovirus,
influenza, parainfluenza). - Several of these have specific treatments so be
aware of them (eg. Aerosolized ribavirin)
124Fungal infections
- Major problem in the long term.
- Aspergillus and Candida account for majority.
- Both can represent colonization but also can be
life-threatening infections. - Aspergillus colonization and infection occur
within first 6 months. - Mortality for pneumonia/disseminated disease
approaches 60. - Critical Care Aspects of Lung Transplantation.
Journal of Intensive Care Med 19(2) 2004
125Fungal infections
- Several antifungal prophylactic strategies used.
- Systemic or inhaled or both.
- However, use of systemic antifungal therapies
limited by lack of in vitro activity against some
infections, drug interactions, significant
treatment limiting toxicities. - Several reports of using inhaled Ampho B lipid
complex.may see used in future.
126Fungal infections
- What do we do?
- Candida prophylaxis nystatin swish and swallow.
- PCP septra or aerosolized pentamidine.
- Aspergillusaerosolized ampho B.
- Toxoplasma neg px pyrimethamine for 6 months.
127Fungal infections
- Although bronchial dehiscence is a rare
complication due to improved surgical tech and
lack of steroids for period of time after OR. - B/c of inherent ischemia occurring at the
anastomosis fungal infections my develop at this
site. - This can lead to life threatening airway
complicatoins. - Careful attention should be paid to this area on
all bronchoscopies.
128Fungal infections
- In one study by Nunley it was found that 46.7
with anastamosis infections had airway
complications where in only 8.7 of patients
without. - These included bronchial stenosis,
bronchomalacia, fatal hemorrhage and dehiscence. - Nunley et al. Chest 20021221185-1191.
129Fungal infections
- If on bronchoscopic inspection have
pseudomembranes should perform biopsy. - Optimal treatment still unknown.
- Suggested expert opinion is that should use
combination of systemic and inhaled antifungal
agents. (eg. Ampho B) - May need bronchoscopic debridement of the tissue.
130Fungal infections
- Treatment of systemic infections.
- Albicans still fluconazol.
- Non-albicans caspofungin.
- Ampho B is classic drug of choice for aspergillus
and fusarium. More utilization of Vori and caspo
in last several years. - Careful with Vori as has extensive interactions
with immunosuppressants. - Nunley et al. Chest 20021221185-1191.
131CASE
- The oxygen delivered via ECMO was adjusted
according to the arterial blood gas results, and
was successfully reduced to 40 within 4 days.
After the first 48 hours, the ECMO flow rate was
maintained at 2.5 L/min, with 3200 RPM. Prior to
discontinuation of ECMO, the patient was relying
on his lung for oxygenation with no oxygen given
through the oxygenator.
132CASE
- Both the cannulae were successfully removed with
application of pressure on the site and without
any problems. The patient did very well there
after and was discharged to the ward within 8
days. - While on the ward several surveillance
bronchoscopies were performed. There were some
pseudomembrains seen near the anastomosis and
they were sampled. They were positive for
candida sp. and treatment initiated with IV
caspofungin. The site looked stable during
repeated bronchoscopy.
133CASE
- On day 15 you are called to the ward for
respiratory decline. He is in respiratory
distress and a CXR is performed.
134(No Transcript)
135CASE
- What is high on your differential for the cause
of the abnormality? - The patient requires reintubation, independent
lung ventilation and is taken to the OR for
repair of his bronchial dehiscence. - Is there any evidence for the outcomes of Lung
transplant patients who require readmission to
the ICU?
136- All lung transplants at Duke University Medical
Center discharged from hosp between March 99 and
Feb 01. - 51/214 px (23.8) required ICU admissions.
- Of those 27/51 (57.5) required MV.
- Dx
- Resp failure (70)
- Sepsis (6.8)
- Pneumothorax, atrial fib, high-risk bronchoscopy,
PE, antibiotic desensitization and cardiac arrest
(2.7 each)
137- 19/51 (37) died during their ICU admission.
- 16/27 (59) receiving MV died.
- Px who died had lower FEV1 to posttransplant best
FEV1 ratio prior to ICU admission. (51 vs 75
p0.001) - Also, had higher APACHE III scores on ICU
admission compared to survivors.
138- Survival rates by Kaplan-Meier
- 1 year 43.1
- 2 year 40.9
139- Conclusions
- ICU admission and mechanical ventilation, is
associated with a poor prognosis in lung
transplant but. - Is appropriate for selected patients with good
allograft function.
140Conclusions
- More immediate ICU complications with IPAH and
IPF. - Beware the patient that required by-pass or that
did poorly on single lung ventilation. - If become shocky.act quickly and look for the
diagnosis. (? Bleeding, STAT TEE, contact
surgeon) - Reperfusion injury is a diagnosis of exclusion
and may require independent lung ventilation or
ECMO.
141Conclusions
- Predictors of need for independent lung
ventilation include preoperative airflow
limitation (FVC1/FVC) and hyperinflation. - Mobilize ECMO early.
- If questioning diagnosis of acute rejection vs
infection use open lung biopsy. - Acute rejection is a marker for future BOS.we
may be able to make a difference. - Patients with post-op good allograft function
should be candidates for readmission to ICU.