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Basics of Treatment of Victims of Radiation Terrorism or Accidents Niel Wald, M.D. Dept. of Environmental and Occupational Health University of Pittsburgh.

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Presentation on theme: "Basics of Treatment of Victims of Radiation Terrorism or Accidents Niel Wald, M.D. Dept. of Environmental and Occupational Health University of Pittsburgh."— Presentation transcript:

1 Basics of Treatment of Victims of Radiation Terrorism or Accidents Niel Wald, M.D. Dept. of Environmental and Occupational Health University of Pittsburgh

2 Medical Radiation Problems External Radiation Source: –Local Radiation Injury –Acute Radiation Syndrome Radionuclide Contamination : –External –Localized in Wound –Internal

3 LOCAL RADIATION INJURY: RADIODERMATITIS TypeManifestation IErythema IITransepidermal Injury IIIDermal Radionecrosis IVChronic Radiodermatitis

4 Local Injury: Transepidermal (Beta Radiation + Thermal Burns)

5 Local Radiation Injury PXD14

6 Local Radiation Injury PXD 22

7 Local Radiation Injury PXD 90

8 Local Radiation Injury Therapy AMPUTATION STAGES Upper Extremities 5 mo 4 mo 5 mo 6 mo 5 mo 7 mo 7 mo 10 mo 17 mo 12 mo RightLeft

9 Arteriole (post-irradiation)

10 Local Radiation Injury PXD22

11 Local Radiation Injury PXD 29

12 Local Radiation Injury PXD 92

13 Local Radiation Injury Diagnosis Inspection: Erythema Blood Flow: Thermography; Isotope scanning ( 201 Tl scintigraphy); Skin laser Doppler. Tissue Density and Hydration: MRI; CT; 67 Ga scintigraphy; 111 In-labeled anti-myosin antibody scan..

14 Useful Steps in Clinical Care of Local Radiation Injury History and Physical Examination Serial Blood Counts Chromosome Analysis Re-enactment of Accident Frequent Color Photographs Baseline Extremity X-rays Ophthalmologic Slit Lamp Examination Sperm Counts Surgical Consult

15 Local Radiation Injury Therapy Analgesics, Antipruritics Anti-inflammatories Antibiotics as needed Skin Growth Factors Synthetic Occlusive Dressings Surgical Intervention: –Debridement –Excision and Grafting –Amputation

16 Diagnostic X-Ray Injury

17 Diagnostic X-ray Injury: Repaired

18 Acute Radiation Syndromes and Their Management Key underlying pathophysiology at the cell and organ level Description of syndromes Diagnostic procedures Clinical care 589-1

19 Acute Radiation Syndromes Underlying Cellular Radiation Effects –Mitotic inhibition –Cell killing –Organ malfunction –Vascular reactions Clinical Manifestations –Hematological –Gastrointestinal –Neurovascular –Pulmonary

20 Three Stage Kinetic Model

21 Prodromal Symptoms & Signs Neurogenic Vascular Anorexia Conjunctivitis Nausea Skin Erythema Vomiting Diarrhea Fever Weakness

22 Radiation Erythema (PXD 10)

23 Radiation Epilation (PXD 23)

24 ARS: 45 Days post-Epilation

25 ARS: Hematopoietic Form 38-C

26 ARS: Hematologic Course

27 Hematopoietic Syndrome Systemic Effects Immunodysfunction –Increased Infectious Complications Hemorrhage –Anemia Impaired Wound Healing

28 ARS: Gastrointestinal Form 38-D

29 Mechanism of GI Syndrome (Gunter-Smith Hypothesis) 627-1

30 GI Syndrome Systemic Effects Malabsorption Ileus –Vomiting –Abdominal distention Fluid and Electrolyte Shifts –Dehydration –Acute renal failure –Cardiovascular GI Bleeding Sepsis

31 ARS: Neurovascular Form 38-E EXCITATION PHASE

32 Autonomic Nervous System 49-B

33 HYPOTHALAMIC SYSTEM 322-1

34 Neurovascular Syndrome Systemic Effects Vomiting and Diarrhea within Minutes Confusion and Disorientation Severe Hypotension Hyperpyrexia Cerebral Edema Convulsions - Coma Fatal within 24 to 48 Hours

35 ARS- Pulmonary Form (pre-exposure)

36 ARS- Pulmonary Form (exudative stage)

37 ARS- Pulmonary Form (fibrotic stage)

38 Pulmonary Syndrome Systemic Effects Early Phase –Dyspnea –Cough –Pulmonary Edema –Acute Respiratory Distress Syndrome Late Phase –Interstitial Fibrosis –Interstitial Pneumonitis –Chronic Respiratory Distress Syndrome

39 Acute Radiation Syndrome Psychological Stress Infection –Bacterial, viral, fungal, CMV, herpes Hemorrhage Radiation Enterocolitis Radiation Pneumonitis Combined Injuries –Radiation plus trauma, burns, etc. Clinical Management Problems 648-4

40 General Treatment Plan for External Exposure Provide Psychological Support –Professional –Family –Clergy Use Symptomatic Treatment –Antiemetics –Analgesics Prevent Infection and Hemorrhage –Reverse Isolation –Antibiotics –Blood Products

41 General Treatment Plan (cont.) Maintain Hydration and Nutrition –Fluids –Electrolytes –Nutrients Encourage Cell Renewal –Growth Factors –Stem Cells Control Inflammatory Response –Steroids –Vasodilators

42 Psychological Stress Reducers One Responsible Decision-Maker Realistic Appraisal of Problem and Clear Communication Credible Action Plan and Adequate Resources Pre-Emergency Education

43 Infection Problems Secondary to Radiation Pancytopenia Invasion and colonization of rectal or colonic wall by normal flora Activation of latent infections Opportunistic infections –Gram Negative –Staphylococcus Aureus 56-J

44 General Anti-Infection Measures in Radiation Pancytopenia Control Bacterial and Fungal Flora of –Naso-Oro-Pharyngeal Tract –Gastrointestinal Tract Avoid Disruption of Skin and Mucosa Introduce Environmental Control Use Optimal Regimen vs. Overt Infection

45 Selective Bacterial Decontamination Some Oral Agents that have been used: Nasopharyngeal Tract: –B-Lactam Resistant Penicillins p.o. and Bacitracin to nares Gastrointestinal Tract: –Trimethoprim-Sulfamethoxazole or Polymixin + above, or Polymixin + Nalidixic Acid and Amphotericin or Nystatin p.o. –CONSULT INFECTIOUS DISEASE, TRANSPLANT, or HEMATOLOGY/ONCOLOGY SPECIALISTS for BEST CURRENT THERAPY for IMMUNOSUPPRESSED PATIENTS

46 Environmental Control in Radiation Pancytopenia Air Filtration and Positive Pressure Reverse Isolation Procedures Dietary Considerations Special Precautions for Skin Punctures Limitation of Attending Personnel

47 ARS: Environmental Control

48 Bedside Debriding of Local Radiation Injury

49 Preparation For Hematologic Complications In Radiation Pancytopenia Transfusions:Erythrocytes Platelets Growth Factors:GSF, GMCF, IL2, etc. Stem Cell Transplants:Autografts (Marrow, cord, PB)Isografts Homografts Xenografts (?)

50 Infection Therapy in Radiation Pancytopenia Aminoglycosides (Gentamicin,etc.) –most effective Ureido-Penicillins (Ticarcillin,etc.) –synergistic vs. gram-negative Monobactams –effective vs. gram-negative & no renal toxicity B-Lactam Resistant Penicillins (Methicillin,etc.) –effective vs. S.aureus CONSULT INFECTIOUS DISEASE, TRANSPLANT, or HEMATOLOGY/ ONCOLOGY SPECIALISTS for BEST CURRENT THERAPY for IMMUNOSUPPRESSED PATIENTS Some Systemic Agents that have been used: 434-2

51 Uses of Hematopoietic Growth Factors Mobilize peripheral-blood progenitor cells Expand hematopoietic cell population Speed and enhance hematopoietic recovery Early hematopoietic recovery will reduce nonhematological toxicity (infection, mucositis, pneumonia, etc.) Augment transplant using smaller number of hematopoietic cells 583-3

52 Marrow Transplantation Procedure (after E.D. Thomas and C.D. Buckner) Donor: –Compatability matching. –General anesthesia. –100 sites aspirated in sternum, ant. & post. Iliac crests. Marrow: –4cc aspirates into TC ,000 U Connaught preservative-free heparin. –9 X 10 9 marrow cells in 400cc passed through 300u and 200u S.S. screens. Recipient: –Given marrow I.V. rapidly from Fenwall bag. 58-D

53 ARS: Hematologic Response to Stem Cells

54 ARS: Current Treatment Challenges - Gastrointestinal Syndrome Therapy 5HT3 (5-hydroxytriptamine) receptor antagonist Radioprotectants (WR-2721) Cytokines (IL-1, G-CSF) Prostaglandin antagonists Sucralfate Gut microbial and fungal suppression Vasopressin Elemental Diet (amino acids, sucrose, limited fat) Glutamine

55 ARS: Current Treatment Challenge -Pulmonary 679-8

56 Combined Injury: A-Bomb Patients Type of Injury % Died Before 20 px-days % Alive at 20 or more px-days Radiation Severe Rad Sx Thermal burns Mechanical Trauma

57 ARS: General Therapeutic Approach Provide Psychological Support Use Symptomatic Treatment Prevent Infection and Hemorrhage Maintain Hydration and Nutrition Encourage Cell Renewal Control Inflammatory Response

58 ARS: Therapy Summary 583-7

59 Radiation Accident Management Type of Accident Worst Consequence Preparation _ Time___ External Exposure Death in 0-6 Weeks 1-2 Weeks After Accident Internal Contamination Cancer in 5-25 Years Months-Years before Accident

60 Internal Exposure Variables Routes of Entry: –Inhalation, Ingestion, Injection and Absorption Decay Rates and energies Chemical Compounds, Solubility, Particle Size, etc. Time and Duration Radionuclides and Forms Metabolic Behavior –Deposition, Retention, Elimination and Critical Organs

61 Initial Management of the Externally Contaminated Patient FIRST AID prn. for SHOCK, BLEEDING and ACUTE RESPIRATORY DISTRESS Gross Decontamination Removal of Contaminated Clothing –Washing and removal of Contaminated Hair –Removal of Gross Wound Contamination Intermediate Stage (at clean location,if necessary) –Removal of Contaminated Clothing –Further Local Decontamination, Swabs of Body Orifices Final Stage –Patient Discharged with Fresh Clothing –More Definitive Decontamination (surgical) and Other Therapy at Dispensary or Hospital

62 Decontaminating Agents Soap and Water Abrasive Soap and Water Detergents –(10%) Dreft, Tide; Phisohex, Hemosol Oxidizers –Chlorox (20%), KMnO 4 Complexers –Citric Acid (1%) Chelators –Versene (1%) EDTA, DTPA

63 Early Treatment For Radionuclide Inhalation Irrigate Nose, Mouth and Pharynx No Effective Medical Means to enhance lung clearance Consider Bronchopulmonary Lavage for Major Long-Lived High- Hazard Lung Contamination

64 Early Treatment For Radionuclide Ingestion Irrigate Nose, Mouth and Pharynx Remove Gastric Contents Give Purgative (10gm MgSO 4 in 100 ml water) Give Chemical Antidote for Blocking, Diluting or Chelating

65 Early Treatment For Contaminated Wounds Irrigate Wound –Saline –Water Decontaminate Skin (But Do Not Injure) –Detergent Continue Wound Irrigation Until Radiation Level Is Zero or Constant Treat Wound as Usual –Consider Excision of Embedded Long- Lived High-Hazard Contaminants

66 Pu-Contaminated Lacerations

67 Pu-Contaminated Wound Monitoring

68 Plutonium in Scar Tissue

69 Treatment of Internal Contamination Reduce G.I. Absorption Hasten Excretion Use Blocking or Diluting Agents When Appropriate Use Mobilizing Agents Use Chelating Agents If Available

70 Therapy For Isotope Decorporation Dilution – 3 H: Water – 32 P: Phosphorus (Neutraphos) Blocking – 137 Cs: Prussian Blue – 131 I, 99 Tc: KI (Lugol’s) – 90 Sr, 85 Sr: Na-Alginate (Gaviscon), Al-Phosphate or Hydroxide Gel (Phosphajel or Amphojel)

71 Therapy For Isotope Decorporation (cont.) Mobilization – 86 Rb: Chlorthalidone (Hygroton) Chelation – 252 Cf, 242 Cm, 241 Am, 239 Pu, 144 Ce, Rare Earths, 143 Pm, 140 La, 90 Y, 65 Zn, 46 Sc: DTPA – 210 Pb: EDTA, Penicillamine – 210 Po: Dimercaprol (BAL) – 203 Hg, 60 Co: Penicillamine

72 Prevention of Health Effects in Radionuclide Contamination Event Physical: –Shelter –Evacuation Biomedical: –Thyroid Blocking –Personal Decontamination –Control of Intake

73 Bibliography The Medical Basis for Radiation-Accident Preparedness: The Clinical Care of Victims. Ricks, R.C., Berger, M.E. and O’Hara, Jr., F.M.,Editors. Parthenon Publishing Group, New York, Medical Management of Radiation Accidents. Gusev, I.A., Guskova, A.K. and Mettler Jr., F.A., Editors, CRC Press, Boca Raton, FL, NCRP Report No Management of Terrorist Events Involving Radioactivity. National Council on Radiation Protection and Measurements Committee 46-14, John W. Poston, Sr. Chairman; NCRP, Washington, DC, 2001.

74 Advances in the Biosciences: Advances in the Treatment of Radiation Injuries. MacVittie, T.J., Weiss, J.F., and Browne, D., Pergamon Press, New York, Medical Effects of Ionizing Radiation. 2 nd Edition. Mettler, F.A.Jr, and Upton, A.C., W.B. Saunders, Philadelphia, PA, NCRP Report No. 65, Management of Persons Accidentally Contaminated with Radionuclides. National Council on Radiation Protection and Measurements Committee, George L. Voelz, Chairman; NCRP, Washington, DC, 1980.


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