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University of Wisconsin Organ Procurement Organization

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Presentation on theme: "University of Wisconsin Organ Procurement Organization"— Presentation transcript:

1 University of Wisconsin Organ Procurement Organization
Brain Death & Organ Donor Management William Snyder, RN, BSN, CPTC Organ Procurement Coordinator University of Wisconsin Organ Procurement Organization 1-866-UWHC OPO ( )

2 Effective Donor Management
Stabilize the donor – Facilitate brain death exam or DCD Tool. Manage the donor – To optimize the function and viability of all transplantable organs.

3 Effective Donor Management
Requires clinical expertise, vigilance, flexibility, and the ability to address multiple complex clinical issues simultaneously and effectively. Requires collaboration among the OPO, donor hospital critical care staff and consultants, and transplant program staff.

4 Effective Donor Management
Donor care is not usually assumed until after consent for donation has been obtained. It is appropriate to collaborate prior to brain death, consent, etc, to prevent death and keep the option of organ donation open.

5 Effective Donor Management
Revision of existing orders or placement of new medical orders is intended to: D/C medications no longer needed or appropriate (e.g., anticonvulsants, mannitol, sedatives, antipyretics) Continue needed medications, or therapy (e.g., vasoactive drug infusions, IV fluids and vent settings) Create “call orders” that inform bedside personnel of the goals for physiologic parameters and alert OPC of changes in donor status.

6 Diagnosing and Declaring Brain Death

7 Uniform Determination of Death Act
An individual who has sustained either: irreversible cessation of circulatory and respiratory function or (2) irreversible cessation of all functions of the entire brain, including the brain stem, is dead. A determination of death must be made in accordance with accepted medical standards. JAMA Nov 13, 1981 – Vol 246, No. 19

8 Diagnosis of Brain Death
Brain death is a clinical diagnosis. It can be made without confirmatory testing if you are able to establish the etiology, eliminate reversible causes of coma, complete fully the neurologic examination and apnea testing. The diagnosis requires demonstration of the absence of both cortical and brain stem activity, and demonstration of the irreversibility of this state. R. Erff, D.O., Walter Reed Army Medical Center

9 Etiology of Brain Death
Severe head trauma Aneurismal subarachnoid hemorrhage Cerebrovascular injury Hypoxic-ischemic encephalopathy Fulminant hepatic necrosis Prolonged cardiac resuscitation or asphyxia Tumors R. Erff, D.O., Walter Reed Army Medical Center

10 Prerequisites to the Diagnosis
Evidence of acute CNS catastrophe compatible with brain death: Clinical or Neuroimaging Exclusion of reversible medical conditions that can confuse the clinical assessment: Severe electrolyte, acid base and endocrine disturbance Absence of drug intoxication and poisoning Absence of sedation and neuromuscular blockade Hypotension (suppresses EEG activity and CBF) Absence of severe hypothermia (core temp < 35 C)

11 Brain Stem Reflexes Cranial nerve examination:
No pupillary response to light. Pupils midline and dilated 4-6mm. No oculocephalic reflex (Doll’s eyes) – contraindicated in C- spine injury. No oculovestibular reflex (tonic deviation of eyes toward cold stimulus) – contraindicated in ear trauma. Absence of corneal reflexes Absence of gag reflex and cough to tracheal suction.

12 Apnea Testing Once coma and absence of brain stem reflexes have been confirmed  Apnea testing. Verifies loss of most rostral brain stem function Confirmed by PaCO2 > 60mmHg or PaCO2 > 20mmHg over baseline value. Testing can cause hypotension, severe cardiac arrhythmias and elevated ICP. Therefore, apnea testing is performed last in the clinical assessment of brain death. Consider confirmatory tests if apnea test inconclusive.

13 Apnea Testing Following conditions must be met before apnea test can be performed: Core temp > 35.0 C Systolic blood pressure > 90mmHg. Euvolemia Corrected diabetes insipitus Normal PaCO2 ( PaCO mmHg). Preoxygenation (PaO2 > 200mmHg).

14 Brain Death in Children
Clinical exam is same as in adults. Testing criteria depends on age of child. - Neonate < 7 days  Brain death testing is not valid. - 7 days – 2 months - Two clinical exams and two EEG 48 hrs apart. - 2 months – 1 year - Two clinical exams and two EEG 24 hrs apart. - or two clinical exams, EEG and blood flow study. - Age > 1 year to 18 years - Two clinical exams 12 hrs apart, confirmatory study Optional

15 Confirmatory Testing Purely optional when the clinical criteria are met unambiguously. A confirmatory test is needed for patients in whom specific components of clinical testing cannot be reliably evaluated - Incomplete brain stem reflex testing - Incomplete apnea testing - Toxic drug levels - Children younger than 1 year old. - Required by institutional policy R. Erff, D.O., Walter Reed Army Medical Center

16 Confirmatory Tests for Brain Death
Cerebral Blood Flow (CBF) Studies Cerebral Angiography Nuclear Flow Study EEG (when brain scan is not utilized)

17 Cerebral Angiography No Blood Flow Normal Blood Flow

18 Nuclear Flow Study

19 Elements of brain death declaration
Date Time Detailed documentation of Clinical Exam including specifics of Apnea Testing Physician signature Brain death is usually associated with some type of trauma, whether it be a motor vehicle accident or a fall on a patch of ice. As the population ages, however, there are an increasing number of people who have strokes and heart attacks which may also lead to brain death. Most often the patient is an otherwise healthy individual and the process is sudden. Only about 2% of all deaths every year occur in someone who is brain dead.

20 What to expect after brain death

21 Pathophysiology Loss of brain stem function results in systemic physiologic instability: Loss of vasomotor control leads to a hyperdynamic state. Cardiac arrhythmias Loss of respiratory function Loss of temperature regulation  Hypothermia Hormonal imbalance  DI, hypothyroidism

22 Perioperative Management
Following the diagnosis of Brain Death Therapy shifts in emphasis from cerebral resuscitation to optimizing organ fxn for subsequent transplantation. The normal sequelae of brain death results in cardiovascular instability & poor organ perfusion. Medical staff must focus on: - Providing hemodynamic stabilization. - Support of body homeostasis. - Maintenance of adequate cellular oxygenation and donor organ perfusion. Without appropriate intervention brain death is followed by severe injury to most other organ systems. Circulatory collapse will usually occur within 48hrs.

23 Autonomic/Sympathetic Storm
Release of catecholamines from adrenals (Epinephrine and Norepinephrine) results in a hyper-dynamic state: Tachycardia Elevated C.O. Vasoconstriction Hypertension

24 Failure of the Hypothalamus results in:
Impaired temperature regulation - hypothermia or hyperthermia Leads to vasodilation without the ability to vasoconstrict or shiver (loss of vasomotor tone) Leads to problems with the pituitary ...

25 Normal Pituitary Gland
Controlled by the hypothalamus Releases ADH to conserve water Stimulates the release of thyroid hormone

26 Pituitary Failure results in:
ADH ceases to be produced = Diabetes Insipidus Can lead to hypovolemia and electrolyte imbalances Leads to problems with the thyroid gland

27 Normal Thyroid Gland Produces hormones that increase the metabolic rate and sensitivity of the cardiovascular system Levothyroxine (T4) Triiodothyronine (T3)

28 Thyroid Failure Leads to: Cardiac instability Labile blood pressure
Potential coagulation problems

29 Cardiovascular System
Intensive care management “Rules of 100’s” - Maintain SBP > 100mmHG - HR < 100 BPM - UOP > 100ml/hr - PaO2 > 100mmHg Aggressive fluid resuscitative therapy directed at restoring and maintaining intravascular volume. SBP > 90mmHg (MAP > 60mmHg) or CVP ~ 10 mmHg.

30 Neurogenic Pulmonary Edema
Brain death is associated with numerous pulmonary problems The lungs are highly susceptible to injury resulting from the rapid changes that occur during the catecholamine storm Left-sided heart pressures exceed pulmonary pressure, temporarily halting pulmonary blood flow The exposed lung tissue is severely injured, resulting in interstitial edema and alveolar hemorrhage, a state commonly referred to as neurogenic pulmonary edema

31 Release of Plasminogen Activator  DIC
Results from the passage of necrotic brain tissue into the circulation Leads to coagulopathy and sometimes progresses further to DIC DIC may persist despite factor replacement requiring early organ recovery (Also affected by hypothermia, release of catecholamines & hemodilution as a result of fluid resuscitation)

32 Organ Donor Management (in a nutshell)
Hypertension  Hypotension Excessive Urinary Output Impaired Gas Exchange Electrolyte Imbalances Hypothermia

33 Hypotension Management
Fluid Bolus – NS or LR (Followed by MIVF NS or .45 NS) Consider colloids (seriously) Dopamine Neosynephrine Vasopressin Thyroxine (T4 protocol)

34 T4 Protocol Background Brain death leads to sudden reduction in circulating pituitary hormones May be responsible for impairment in myocardial cell metabolism and contractility which leads to myocardial dysfunction Severe dysfunction may lead to extreme hypotension and loss of organs for transplant

35 T4 Protocol Bolus: 15 mg/kg Methylpred Infusion:
20 mcg T4 (Levothyroxine) 20 units of Regular Insulin 1 amp D50W Infusion: 200 mcg T4 in 500 cc NS Run at 25 cc/hr (10 mcg/hr) Titrate to keep SBP >100 Monitor Potassium levels closely!

36 Vasopressin (AVP, Pitressin)
Low dose shown to reduce inotrope use Plays a critical role in restoring vasomotor tone Vasopressin Protocol 4 unit bolus 1- 4 u/hour – titrate to keep SBP >100 or MAP >60

37 Diabetes Insipidus Management
Treatment is aimed at correcting hypovolemia Desmopressin (DDAVP) 1 mcg IV, may repeat x 1 after 1 hour. Replace hourly U.O. on a volume per volume basis with MIVF to avoid volume depletion Leads to electrolyte depletion/instability monitor closely to avoid hypernatremia and hypokalemia

38 Diabetes Insipidus Goal is UOP 1-3 ml/kg/hr
Rule of thumb – 500 ml UOP per hour x 2 hours is DI Severe cases – Notify OPC. Assess clinical situation.

39 Impaired Gas Exchange Management
Maintain PaO2 of >100 and a saturation >95% Monitor ABG’s q2h or as requested by OPO PEEP 5 cm, HOB up 30o Increase ET cuff pressure immediately after BD declaration Aggressive pulmonary toilet (Keep suctioning & turning q2h) CXR (Radiologist to provide measurements & interpretation) OPO may request bronchoscopy CT of chest requested in some cases

40 Correct Impaired Gas Exchange and Maximize Oxygenation!
Most organ donors are referred with: Chest trauma Aspiration Long Hospitalization with bed rest resulting in atelectasis or pneumonia Impending Neurogenic Pulmonary Edema Brain Death contributes to and complicates all of these conditions

41 Impaired Gas Exchange Goals…
Goals are to maintain health of lungs for transplant while optimizing oxygen delivery to other transplantable organs Avoid over-hydration Ventilatory strategies aimed to protect the lung Avoid oxygen toxicity by limiting Fi02 to achieve a Pa02 100mmHg & PIP < 30mmHg.

42 Electrolyte Imbalance Management
Hypokalemia If K+ < 3.4 – Add KCL to MIVF (anticipate low K+ with DI & T4 administration) Hypernatremia If NA+ >155 – Change MIVF to include more free H20, Free H20 boluses down NG tube (this is often the result of dehydration, NA+ administration, and free H20 loss 2o to diuretics or DI) Calcium, Magnesium, and Phosphorus Deficiencies here common…often related to polyuria associated with osmotic diuresis, diuretics & DI.

43 Hypothermia Management
Monitor temperature continuously NO tympanic, axillary or oral temperatures. Central only. Place patient on hypothermia blanket to maintain normal body temperature In severe cases (<95 degrees F) consider: warming lights covering patient’s head with blankets hot packs in the axilla warmed IV fluids warm inspired gas

44 Anemia Hematocrit < 30% must be treated
Transfuse 2 units PRBC’s immediately Reassess 1o after completion of 2nd unit and repeat infusion of 2 units if HCT remains below 30% Assess for source of blood loss and treat accordingly

45 Incidence of pathophysiologic changes following Brain Death:
- Hypotension 81% - Diabetes Insipidus 65% - DIC % - Cardiac arrhythmias 25% - Pulmonary edema 18% - Metabolic acidosis 11% Physiologic changes During Brain Stem Death – Lessons for Management of the Organ Donor. The Journal of Heart & Lung Transplantation Sept 2004 (suppl)

46 Organ Donation Process
Evaluate organ function Labs (& UA) within 6 hours of surgery Type and Screen Consent signed Serology testing Medical Social History Locate potential recipients Manage hemodynamics Arrange operating room

47 The Teams... Your Hospital Abdominal Transplant Team
- Anesthesia - Primary Care Physician or Intensivist (For DCD) Surgical Technician/Scrub Nurse Circulating Nurse Abdominal Transplant Team - Surgeon - Physician Assistant - Surgical Recovery Coordinator Cardiothoracic Team - Surgical Fellow

48 Organ Preservation Time
Heart: 4-6 hours Lungs: 4-6 hours Liver: 12 hours Pancreas: hours Kidneys: 72 hours Small Intestines: 4-6 hours

49


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