18 th TPM course, November 2012 Maastricht Classification of DCD Definition Where I Dead on arrival Spain, France, Italy II Unsuccessful resuscitation III Cardiac arrest awaited after withdrawal of life support in patients who are not brain dead Belgium, United Kingdom, Netherlands, Australia, USA, New Zealand IV Cardiac arrest after brain death MC I, II, uncontrolled MC III, IV: controlled
Maastricht Classification of DCD. MC I, II, uncontrolled MC III, IV: controlled. An Introduction to Maastricht Category III DCD. Dr Paul Murphy National Lead for Organ Donation NHS Blood and Transplant, UK. Controlled DCD – the donation process. Objectives for the session – to understand. - PowerPoint PPT Presentation
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18th TPM course, November 2012
Maastricht Classification of DCD
Definition Where
I Dead on arrivalSpain, France, Italy
II Unsuccessful resuscitation
III Cardiac arrest awaited after withdrawal of life support in patients who are not brain dead
Belgium, United Kingdom, Netherlands, Australia, USA, New ZealandIV Cardiac arrest after brain death
MC I, II, uncontrolled
MC III, IV: controlled
18th TPM course, November 2012
An Introduction to Maastricht Category III DCD
Dr Paul MurphyNational Lead for Organ Donation
NHS Blood and Transplant, UK
18th TPM course, November 2012
Controlled DCD – the donation process
• Definition of category III DCD• Key elements of the category III DCD pathway• Obstacles to DCD donation
– Family approach and conflict of interest– Who can donate: prediction of asystole– Limitation of ischaemic injury– Diagnosis of death and post mortem
interventions
• Outcomes– Contribution to transplantation in UK
Objectives for the session – to understand
18th TPM course, November 2012
The pathway of controlled DCD
The retrieval of organs from patients whose death is diagnosed on cardio-respiratory criteria and which follows the planned withdrawal of life-sustaining treatments.
18th TPM course, November 2012
How is end of life care changed to support DCD?
18th TPM course, November 2012
General overview
DCD as part of end of life careKey considerations
We view DCD as part of the care we give patients when they die – offered, not imposed
• Donation considered before death• Withdrawal delayed by several hours
– Physiological instability• Altered management of death
– ? Withdrawal in anaesthetic room– Diagnosis of death after 5 minutes of asystole– Rapid transfer to theatre
• Organ ischaemia and graft outcomes• Stand down• Substitution
18th TPM course, November 2012
General overview
DCD as part of end of life careKey considerations
• Donation considered before death• Withdrawal delayed by several hours
– Physiological instability• Altered management of death
– ? Withdrawal in anaesthetic room– Diagnosis of death after 5 minutes of
asystole– Rapid transfer to theatre
• Organ ischaemia and graft outcomes• Stand down• Substitution
40% of DCD retrievals in the UK are stood down.
18th TPM course, November 2012
• Decision making around withdrawal of treatments should be transparent and consistent– All ICUs and EDs should have explicit local
policies based upon national guidance
– Multi-disciplinary
• Donation should only be raised after a family have understood and accepted their loss– presented as an end of life care option
Family approach and conflict of interest
“You should be prepared to follow any national
procedures for identifying potential organ donors”
GMC
18th TPM course, November 2012
Ischaemic injury in category III DCD
asystole coldperfusion
transplantreperfusion
withdrawal
cold ischaemia
decision reWLST
warm ischaemia
terminal physiological decline
SBP < 50mmHgSaO2 < 75%
18th TPM course, November 2012
Ischaemic injury
asystole coldperfusion
transplantreperfusion
withdrawal
cold ischaemia
decision reWLST
functional warm
ischaemia
NB: timeline not to scale
agonalperiod
SBP < 50mmHgSaO2 < 75%
18th TPM course, November 2012
Time to asystole
56% die within 60 mins64% die within 2 hours72% die within 4 hours
In the UK, death can be confirmed after 5 minutes of complete and continuous absence of cardio-respiratory function…………
18th TPM course, November 2012
Diagnosis of Death
• Asystole is absence of mechanical cardiac function, not electrical silence on ECG
• It is best diagnosed by
– Invasive arterial pressure monitoring
– Echocardiography
• If invasive pressure monitoring or echocardiography are not available, identify on basis of isoelectric ECG
Death can be diagnosed after five minutes of continuous asystole
18th TPM course, November 2012
Diagnosis of Death
• Death is confirmed by demonstrating the absence of neurological function (respiration, consciousness and brain-stem reflexes) after 5 minutes of continuous asystole
• Any return of cardiac or respiratory function must prompt further 5 minutes of observation
Death is regarded as the simultaneous and irreversible loss of consciousness and
respiration
18th TPM course, November 2012
Diagnosis of death and organ retrieval
• A clear intention not to perform cardio-pulmonary resuscitation
• Confidence that the possibility of spontaneous return of cardiac function has passed
• An absolute prohibition on any intervention that might restore cerebral oxygenation
– Restoration of myocardial contractility
– Extracorporeal oxygenation
The brain remains responsive to restoration of oxygenation of some
minutes
18th TPM course, November 2012
Methods of retrieval
Perfusion in situIntra-peritoneal cooling
Crash laparotomySuper-rapid perfusion
18th TPM course, November 2012
asystole coldperfusion
transplantreperfusionwithdrawal
cold ischaemia
Solutions to ischaemic injuryNormothermic regional perfusion
normothermicregional
perfusion
Normothermic reperfusion serves to restore aerobic conditions prior to cold
perfusion
18th TPM course, November 2012
Reversing organ ischaemia
• Laparotomy, cannulation and perfusion with preservation solutions can begin as soon as death has been confirmed
• Regional normothermic perfusion of abdominal organs with oxygenated blood can take place as soon as the cerebral circulation has been isolated
18th TPM course, November 2012
Lung retrieval from DCD donors
• Re-intubation can take place as soon as death has been confirmed
• Lungs can be re-inflated with a single insufflation after 10 minutes
• Cyclical mechanical ventilation can only begin when the cerebral circulation has been isolated.
DCD donors may become the preferred source of lungs – particularly if assessed