2. Environmental andEnvironmental and
Nutritional PathologyNutritional Pathology
Environment and DiseaseEnvironment and Disease
Common ExposuresCommon Exposures
EnvironmentalEnvironmental
OccupationalOccupational
NutritionNutrition and Diseaseand Disease
3. Reported Occupational DiseasesReported Occupational Diseases
DiseaseDisease NumberNumber PercentagePercentage
Repeated traumaRepeated trauma 276,600276,600 6464
Skin disordersSkin disorders 57,90057,900 1313
Lung conditions due toLung conditions due to
toxic exposurestoxic exposures
20,30020,300 55
Physical injuryPhysical injury 16,60016,600 44
PoisoningPoisoning 5,1005,100 11
Lung disease due toLung disease due to
dustsdusts
2,9002,900 11
All other illnessesAll other illnesses 50,60050,600 1212
TotalTotal 430,000430,000 100100
4. Mechanisms of ToxicityMechanisms of Toxicity
Threshold effectThreshold effect
Absorption at portals of entryAbsorption at portals of entry
ingestioningestion
inhalationinhalation
skin contactskin contact
Distribution within the bodyDistribution within the body
Metabolism and ExcretionMetabolism and Excretion
Toxic effectsToxic effects
5. Xenobiotic Mechanisms
Phase I Reactions (Smooth ER), makes them
less lipophilic by adding a direct polar group
Cytochrome P-450-dependent monooxygenase
system
Flavin-containing monooxygenase system
Peroxidase-dependent cooxidation
Phase II Reactions, combines them with other
polar substances
Glucuronidation
Biomethylation
Glutathione conjugation
6.
7. Contents of Toxic Waste Dumps
Acetone DDT, DDE, DDD
Aldrin/Dieldrin 1,1 and 1,2-Dichloroethane
Arsenic Lead
Barium Mercury
Benzene Methylene chloride
2-Butanone Nickel
Cadmium Pentachlorophenol
Carbon tetrachloride Polychlorinated biphenyls
Chlordane Tri- and Tetrachloroethylene
Chloroform Toluene
Chromium Vinyl Chloride
Cyanide Zinc
9. CommonCommon ExposuresExposures
PersonalPersonal
MedicationsMedications
Outdoor Air PollutionOutdoor Air Pollution
Indoor Air PollutionIndoor Air Pollution
Industrial ExposuresIndustrial Exposures
Agricultural HazardsAgricultural Hazards
Natural ToxinsNatural Toxins
Radiation InjuryRadiation Injury
Physical InjuryPhysical Injury
10. TobaccoTobacco
440,000 premature deaths/year in USA440,000 premature deaths/year in USA
cancercancer
cardiovascular diseasecardiovascular disease
respiratory diseaserespiratory disease
cerebrovascular diseasecerebrovascular disease
$150 billion in health related costs$150 billion in health related costs
By farBy far the most preventable causethe most preventable cause
of death in the United Statesof death in the United States
12. Organ-Specific Carcinogens in Tobacco Smoke
Organ Carcinogen
Lung, larynx Polycyclic aromatic hydrocarbons
4-(Methylnitrosoamino)-1-(3-pyridyl)-1-buta-none
(NNK)
Polonium 210
Esophagus N'-Nitrosonornicotine (NNN)
Pancreas NNK (?)
Bladder 4-Aminobiphenyl, 2-naphthylamine
Oral cavity (smoking) Polycyclic aromatic hydrocarbons, NNK, NNN
Oral cavity (snuff) NNK, NNN, polonium 210
Data from Szczesny LB, Holbrook JH: Cigarette smoking. In Rom WH (ed): Environmental
and Occupational Medicine, 2nd ed. Boston, Little, Brown, 1992, p. 1211.
13. Relative Risks for Current Smokers of CigarettesRelative Risks for Current Smokers of Cigarettes
Disease or Condition MalesMales FemalesFemales
Coronary heart diseaseCoronary heart disease
Age 35–64Age 35–64 2.82.8 3.13.1
Age ≥ 65Age ≥ 65 1.51.5 1.61.6
Cerebrovascular lesionsCerebrovascular lesions
Age 35–64Age 35–64 3.33.3 44
Age ≥ 65Age ≥ 65 1.61.6 1.51.5
Aortic aneurysmAortic aneurysm 6.26.2 7.17.1
Chronic airways obstructionChronic airways obstruction 10.610.6 13.113.1
CancerCancer
Lip, oral cavity, pharynxLip, oral cavity, pharynx 10.910.9 5.15.1
EsophagusEsophagus 6.86.8 7.87.8
StomachStomach 22 1.41.4
PancreasPancreas 2.32.3 2.32.3
LarynxLarynx 14.614.6 1313
LungLung 23.323.3 12.712.7
CervixCervix 1.61.6
KidneyKidney 2.72.7 1.31.3
Bladder, other urinary organsBladder, other urinary organs 3.33.3 2.22.2
14. Cigarettes And The WorkplaceCigarettes And The Workplace
Similar to asbestos exposure, cigarette smoke isSimilar to asbestos exposure, cigarette smoke is
synergistic with radon decay products in causingsynergistic with radon decay products in causing
lung cancerlung cancer
Cigarette smoke exacerbates bronchitis, asthma,Cigarette smoke exacerbates bronchitis, asthma,
and pneumoconiosis associated with exposureand pneumoconiosis associated with exposure
to silica, coal dust, grain dust, cotton dust, andto silica, coal dust, grain dust, cotton dust, and
welding fumeswelding fumes
15. AlcoholAlcohol
15 to 20 million alcoholics in the USA15 to 20 million alcoholics in the USA
100,000 deaths/year due to alcohol100,000 deaths/year due to alcohol
abuseabuse
Economic losses of $100 to $130Economic losses of $100 to $130
billion/yearbillion/year
One to two drinks/day reducesOne to two drinks/day reduces
incidence of coronary artery disease*incidence of coronary artery disease*
* What kind of person would put this kind of bullet on a
powerpoint?
A. Drinker? B) Non-Drinker?
17. Effects of Blood Alcohol Levels in the Absence of ToleranceEffects of Blood Alcohol Levels in the Absence of Tolerance
Blood Level, mg/dLBlood Level, mg/dL Usual EffectUsual Effect
2020 Decreased inhibitions, a slightDecreased inhibitions, a slight
feeling of intoxicationfeeling of intoxication
8080 Decrease in complex cognitiveDecrease in complex cognitive
functions and motor performancefunctions and motor performance
200200 Obvious slurred speech, motorObvious slurred speech, motor
incoordination, irritability, andincoordination, irritability, and
poor judgmentpoor judgment
300300 Light coma and depressed vitalLight coma and depressed vital
signssigns
400400 DeathDeath
Harrison Internal Med, 16th
Ed
21. Widmark EquationWidmark Equation
C = A / (W * r)C = A / (W * r)
C = concentration of EtOH in mg/dlC = concentration of EtOH in mg/dl
A = mass of alcohol ingested in gramsA = mass of alcohol ingested in grams
density of ethanol = 0.8density of ethanol = 0.8
W = body weight in gramsW = body weight in grams
r = Widmark distribution for ethanolr = Widmark distribution for ethanol
0.55 mL/ g body weight for females0.55 mL/ g body weight for females
0.68 mL / g body weight for males0.68 mL / g body weight for males
Elimination of ethanol = 0.015%/h (15mg/dl/h)Elimination of ethanol = 0.015%/h (15mg/dl/h)
zero order kineticszero order kinetics
Medical measurements use mg/dl in plasma, whereasMedical measurements use mg/dl in plasma, whereas
legal definitions use percentage (mass/volume) in wholelegal definitions use percentage (mass/volume) in whole
bloodblood
to estimate the alcohol level in whole blood using the alcoholto estimate the alcohol level in whole blood using the alcohol
level in blood plasma, divide by 1.16level in blood plasma, divide by 1.16
22. Alcohol and the LiverAlcohol and the Liver
Fatty ChangeFatty Change
present in over 90% of binge and chronic drinkerspresent in over 90% of binge and chronic drinkers
liver is enlarged but patient is asymptomaticliver is enlarged but patient is asymptomatic
changes are reversible with cessation of drinkingchanges are reversible with cessation of drinking
macrosteatosis w/o inflammation or necrosismacrosteatosis w/o inflammation or necrosis
Alcohol hepatitisAlcohol hepatitis
only between 10 - 15% of alcoholics will developonly between 10 - 15% of alcoholics will develop
alcoholic hepatitisalcoholic hepatitis
may have systemic symptoms and jaundicemay have systemic symptoms and jaundice
hepatocellular necrosis with Mallory bodies and PMNshepatocellular necrosis with Mallory bodies and PMNs
(central hyaline sclerosis)(central hyaline sclerosis)
thought to be a precursor of cirrhosisthought to be a precursor of cirrhosis
Alcoholic cirrhosisAlcoholic cirrhosis
shrunken nodular liver with uniform small nodulesshrunken nodular liver with uniform small nodules
(micronodular cirrhosis)(micronodular cirrhosis)
23. Fatty Change BiochemistryFatty Change Biochemistry
Catabolism of fat by peripheral tissues isCatabolism of fat by peripheral tissues is
increased, and there is increased delivery ofincreased, and there is increased delivery of
free fatty acids to the liverfree fatty acids to the liver
An excess of NADH over NAD stimulatesAn excess of NADH over NAD stimulates
lipid biosynthesislipid biosynthesis
Oxidation of fatty acids by mitochondria isOxidation of fatty acids by mitochondria is
decreaseddecreased
Acetaldehyde forms adducts with tubulin andAcetaldehyde forms adducts with tubulin and
impairs function of microtubules, resulting inimpairs function of microtubules, resulting in
decreased transport of lipoproteins from thedecreased transport of lipoproteins from the
liverliver
24.
25.
26.
27.
28. Neurologic Manifestations of AlcoholismNeurologic Manifestations of Alcoholism
Wernicke syndromeWernicke syndrome
confusion, ataxia, and diplopia fromconfusion, ataxia, and diplopia from
ophthalmoplegiaophthalmoplegia
damage to mammillary bodies, cerebellum anddamage to mammillary bodies, cerebellum and
periaqueductal gray matterperiaqueductal gray matter of the midbrainof the midbrain
due to thiamine deficiencydue to thiamine deficiency
may respond to prompt thiamine replacementmay respond to prompt thiamine replacement
Korsakov syndromeKorsakov syndrome
memory loss and confabulationmemory loss and confabulation
results from thiamine deficiency and directresults from thiamine deficiency and direct
toxicitytoxicity
29.
30. Mechanisms of Disease Caused by Ethanol Abuse
Organ System Lesion Mechanism
Liver Fatty change Toxicity
Acute hepatitis
Alcoholic cirrhosis
Nervous system Wernicke syndrome Thiamine deficiency
Korsakoff syndrome Toxicity and thiamine
deficiency
Cerebellar degeneration Nutritional deficiency
Peripheral neuropathy Thiamine deficiency
Cardiovascular
system
Cardiomyopathy Toxicity
Hypertension Vasopressor
31. Mechanisms of Disease Caused by Ethanol Abuse
Organ System Lesion Mechanism
Gastrointestinal
tract
Gastritis Toxicity
Pancreatitis Toxicity
Skeletal muscle Rhabdomyolysis Toxicity
Reproductive
system
Testicular atrophy ?
Spontaneous
abortion
?
Fetal alcohol
syndrome
Growth retardation Toxicity
Mental retardation
Birth defects
33. Oral Contraceptives (BCPs)Oral Contraceptives (BCPs)
Breast cancer and other cancersBreast cancer and other cancers
no increase in breast cancerno increase in breast cancer
decrease endometrial and ovarian cancersdecrease endometrial and ovarian cancers
increase in cervical cancer (?lifestyle induced)increase in cervical cancer (?lifestyle induced)
Thromboembolic eventsThromboembolic events
DVT and Pulmonary Embolism increasedDVT and Pulmonary Embolism increased
adds to other risk factors (e.g. Factor V Leiden)adds to other risk factors (e.g. Factor V Leiden)
Cardiovascular diseaseCardiovascular disease
with current low estrogen pills, risk of MI andwith current low estrogen pills, risk of MI and
atherosclerosis not increased in non-smoking women < 45 yatherosclerosis not increased in non-smoking women < 45 y
ischemic stroke increased regardless of age or smokingischemic stroke increased regardless of age or smoking
Liver tumorsLiver tumors
benign hepatic adenomasbenign hepatic adenomas
older women with prolonged useolder women with prolonged use
may rupture and cause intra-abdominal bleedingmay rupture and cause intra-abdominal bleeding
34. Hormone Replacement Therapy (HRT)Hormone Replacement Therapy (HRT)
CancerCancer
in women with a uterus combined estrogen andin women with a uterus combined estrogen and
progestin Rx necessary to reduce endometrial cancerprogestin Rx necessary to reduce endometrial cancer
WHI showed increased risk of breast cancer in womenWHI showed increased risk of breast cancer in women
who used HRT combined therapy for 5 yearswho used HRT combined therapy for 5 years
Thromboembolic eventsThromboembolic events
elevated approximated twofold in HRT users, especiallyelevated approximated twofold in HRT users, especially
within the first 2 yearswithin the first 2 years
Cardiovascular diseaseCardiovascular disease
WHI reported 29% increased risk of myocardialWHI reported 29% increased risk of myocardial
infarction, especially during the first year of combinedinfarction, especially during the first year of combined
HRT useHRT use
35. Acetaminophen (Tylenol)Acetaminophen (Tylenol)
Does not affect cyclooxygenase so bleedingDoes not affect cyclooxygenase so bleeding
associated with aspirin does not occurassociated with aspirin does not occur
Has analgesic and antipyretic actions but noHas analgesic and antipyretic actions but no
anti-inflammatory actionanti-inflammatory action
Large doses may produce hepatic necrosisLarge doses may produce hepatic necrosis
patients should not exceed recommended dosepatients should not exceed recommended dose
(4 grams/day)(4 grams/day)
toxic dose in adults is 15 to 25 gmtoxic dose in adults is 15 to 25 gm
dose should be reduced in children with fever ordose should be reduced in children with fever or
dehydrationdehydration
36. AspirinAspirin
OverdoseOverdose
respiratory alkalosis followed by metabolic acidosis thatrespiratory alkalosis followed by metabolic acidosis that
may be fatalmay be fatal
Chronic aspirin toxicity (salicylism)Chronic aspirin toxicity (salicylism)
headache, dizziness, ringing in the ears (tinnitus),headache, dizziness, ringing in the ears (tinnitus),
mental confusion, drowsiness, nausea, vomiting, andmental confusion, drowsiness, nausea, vomiting, and
diarrheadiarrhea
Inhibits cyclooxygenase (COX 1 & 2)Inhibits cyclooxygenase (COX 1 & 2)
Erosive gastritis is a major cause of GI bleedingErosive gastritis is a major cause of GI bleeding
May be implicated in Reye syndrome (fatty liverMay be implicated in Reye syndrome (fatty liver
with encephalopathy) in children < 15 years old,with encephalopathy) in children < 15 years old,
especially with influenza and chicken poxespecially with influenza and chicken pox
37. Cox-1 and Cox-2 InhibitorsCox-1 and Cox-2 Inhibitors
Cyclooxygenase 1Cyclooxygenase 1
constitutively expressed and active in theconstitutively expressed and active in the
normal platelet (thromboxane A2)normal platelet (thromboxane A2)
involved in synthesis of gastro-protectiveinvolved in synthesis of gastro-protective
prostaglandinsprostaglandins
Cyclooxygenase 2Cyclooxygenase 2
induced, especially in inflamed tissueinduced, especially in inflamed tissue
in vessel wall produces prostacyclin (PGIin vessel wall produces prostacyclin (PGI22))
Aspirin and other nonselective NSAIDSAspirin and other nonselective NSAIDS
inhibit both COX-1 and COX-2inhibit both COX-1 and COX-2
39. Indoor Air PollutionIndoor Air Pollution
Carbon Monoxide COCarbon Monoxide CO
Nitrogen Dioxide NONitrogen Dioxide NO22
Wood SmokeWood Smoke
FormaldehydeFormaldehyde
RadonRadon
Manufactured Mineral FibersManufactured Mineral Fibers
BioaerosolsBioaerosols
40. RadonRadon
Radon is a radioactive gas and a decayRadon is a radioactive gas and a decay
product of uraniumproduct of uranium
It is widely distributed in the soil and isIt is widely distributed in the soil and is
prevalent in homes (especially in basements)prevalent in homes (especially in basements)
Radon decay products are alpha emittersRadon decay products are alpha emitters
10% of US homes have levels associated with10% of US homes have levels associated with
an increased risk of lung cancer and anan increased risk of lung cancer and an
estimated 10,000 lung cancers per year in theestimated 10,000 lung cancers per year in the
United States are due to radon. SmokingUnited States are due to radon. Smoking
elevates risk.elevates risk.
Proper venting reduces the exposureProper venting reduces the exposure
41. LeadLead
lead is classified as a heavy metal (otherslead is classified as a heavy metal (others
include mercury, arsenic, and cadmium)include mercury, arsenic, and cadmium)
Source of exposureSource of exposure
lead paintlead paint
lead solder in plumbing (older houses)lead solder in plumbing (older houses)
lead-glazed ceramicslead-glazed ceramics
industrial exposureindustrial exposure
Route of exposureRoute of exposure
inhalation with industrial exposureinhalation with industrial exposure
ingestion with household exposureingestion with household exposure
42. Lead Distribution and ExcretionLead Distribution and Excretion
Lead is a divalent cation that is taken up byLead is a divalent cation that is taken up by
bone and developing teeth in children (80%bone and developing teeth in children (80%
to 85%)to 85%)
Half-life of lead in bone is 30 yearsHalf-life of lead in bone is 30 years
Blood accumulates 5% to 10% of lead, butBlood accumulates 5% to 10% of lead, but
lead is rapidly cleared from the bloodlead is rapidly cleared from the blood
lead in blood indicates recent exposurelead in blood indicates recent exposure
blood level does not allow the determination ofblood level does not allow the determination of
total body burdentotal body burden
Remainder is distributed in the soft tissuesRemainder is distributed in the soft tissues
Excretion is via the kidneysExcretion is via the kidneys
43. Effects of LeadEffects of Lead
High affinity for sulfhydryl groupsHigh affinity for sulfhydryl groups
inhibition of heme biosynthesis with hypochromicinhibition of heme biosynthesis with hypochromic
anemia and basophillic stippling of erythrocytesanemia and basophillic stippling of erythrocytes
Competition with calcium ionsCompetition with calcium ions
As a divalent cation, lead competes with calcium and isAs a divalent cation, lead competes with calcium and is
stored in bone.stored in bone.
It also interferes with nerve transmission and brainIt also interferes with nerve transmission and brain
development.development.
Inhibition of membrane-associated enzymesInhibition of membrane-associated enzymes
Lead inhibits 5'-nucleotidase activity and sodium-Lead inhibits 5'-nucleotidase activity and sodium-
potassium ion pumps, leading to decreased survival ofpotassium ion pumps, leading to decreased survival of
red blood cells (hemolysis), renal damage, andred blood cells (hemolysis), renal damage, and
hypertension.hypertension.
47. “RADIATION” T ½
Curie vs. Becqerel
IONIZING vs. NON-IONIZING
PARTICULATE vs. NON-PARTICULATE
(Photons)
ENERGY: Kev, Mev (~Wavelength)
Linear Energy Transfer (LET), Relative
Biologic Effect (RBE)
LD50@60d
48. This is the single most
RADIOSENSITIVE CELL
In your body
49. Radiation DosimetryRadiation Dosimetry
Roentgen:Roentgen: unit of charge produced by x-rays or gammaunit of charge produced by x-rays or gamma
rays that ionize a specific volume of airrays that ionize a specific volume of air
RADRAD (radiation absorbed dose):(radiation absorbed dose): the dose of radiationthe dose of radiation
that will produce absorption of 100 ergs of energy per gramthat will produce absorption of 100 ergs of energy per gram
of tissue; 1 gm of tissue exposed to 1 roentgen of gammaof tissue; 1 gm of tissue exposed to 1 roentgen of gamma
rays is equal to 93 ergsrays is equal to 93 ergs
GrayGray (Gy): the dose of radiation that will produce(Gy): the dose of radiation that will produce
absorption of 1 joule of energy per kilogram of tissue; 1 Gyabsorption of 1 joule of energy per kilogram of tissue; 1 Gy
corresponds to 100 rad (SI unit for absorbed dose)corresponds to 100 rad (SI unit for absorbed dose)
REMREM (radiation equivalent man):(radiation equivalent man): the dose of radiation thatthe dose of radiation that
causes a biologic effect equivalent to 1 rad of x-rays orcauses a biologic effect equivalent to 1 rad of x-rays or
gamma raysgamma rays
SievertSievert (Sv): the dose of radiation that causes a biologic(Sv): the dose of radiation that causes a biologic
effect equivalent to 1 Gy of x-rays or gamma rays; 1 Sveffect equivalent to 1 Gy of x-rays or gamma rays; 1 Sv
corresponds to 100 rem (SI unit)corresponds to 100 rem (SI unit)
50. Acute Effects of Ionizing RadiationAcute Effects of Ionizing Radiation
Free radical generationFree radical generation
Ionizing radiation + HIonizing radiation + H220 → H0 → H3300++
+ OH·+ OH·
DNA DamageDNA Damage
double-stranded DNA breaks needed to kill celldouble-stranded DNA breaks needed to kill cell
(mammalian cells can repair single stranded(mammalian cells can repair single stranded
breaks)breaks)
cross-linking of DNA strands, cleavage of sugar-cross-linking of DNA strands, cleavage of sugar-
phosphate bondsphosphate bonds
Tumor-suppressor geneTumor-suppressor gene p53p53 activationactivation
cell cycle arrest in presence of damaged DNAcell cycle arrest in presence of damaged DNA
repair of DNA damage or apoptosisrepair of DNA damage or apoptosis
51. Acute Whole Body RadiationAcute Whole Body Radiation
LD50 @ 6 wks 2.5 to 4.0 Gy (250 to 400 rad)LD50 @ 6 wks 2.5 to 4.0 Gy (250 to 400 rad)
HematopoieticHematopoietic
200–600 REM200–600 REM
Maximum neutrophil and platelet depression in 2 wkMaximum neutrophil and platelet depression in 2 wk
GastrointestinalGastrointestinal
600–1000 REM600–1000 REM
Nausea, vomiting, diarrheaNausea, vomiting, diarrhea
Hemorrhage and infection in 1–3 wkHemorrhage and infection in 1–3 wk
Central nervous systemCentral nervous system
>1000 REM>1000 REM
Intractable nausea and vomitingIntractable nausea and vomiting
Confusion, somnolence, convulsionsConfusion, somnolence, convulsions
death in 14–36 hrdeath in 14–36 hr
52. Therapeutic RadiationTherapeutic Radiation
External radiation is delivered to malignantExternal radiation is delivered to malignant
neoplasms at fractionated doses up to 40 toneoplasms at fractionated doses up to 40 to
70 Gy (4000 to 7000 rad), with shielding of70 Gy (4000 to 7000 rad), with shielding of
adjacent normal tissuesadjacent normal tissues
Therapeutic radiation alone seems to addTherapeutic radiation alone seems to add
little risk of AML but can increase the risk inlittle risk of AML but can increase the risk in
people exposed to alkylating agentspeople exposed to alkylating agents
Fatigue, nausea and vomiting frequentFatigue, nausea and vomiting frequent
Bone marrow suppression may occurBone marrow suppression may occur
especially with chest or abdominal radiationespecially with chest or abdominal radiation
53. Delayed Radiation InjuryDelayed Radiation Injury
Carcinogenesis (atom bomb survivors)Carcinogenesis (atom bomb survivors)
myeloid leukemias peak 5 to 7 years after exposuremyeloid leukemias peak 5 to 7 years after exposure
breast and thyroid cancers may show greater latencybreast and thyroid cancers may show greater latency
no germline mutations noted in progeny of survivorsno germline mutations noted in progeny of survivors
Vascular effectsVascular effects
endothelial necrosis followed by intimal and medialendothelial necrosis followed by intimal and medial
fibrosisfibrosis
capillaries may become thrombosed and obliterated orcapillaries may become thrombosed and obliterated or
ectaticectatic
Parenchymal atrophy and fibrosisParenchymal atrophy and fibrosis
55. Physical InjuryPhysical Injury
AbrasionAbrasion
basically a scrapebasically a scrape
superficial epidermis is torn off by friction or forcesuperficial epidermis is torn off by friction or force
regeneration without scarring usually occursregeneration without scarring usually occurs
Laceration vs. IncisionLaceration vs. Incision
a laceration is an irregular tear in the skin produced bya laceration is an irregular tear in the skin produced by
overstretching. The wound margins are frequently hemorrhagicoverstretching. The wound margins are frequently hemorrhagic
and traumatizedand traumatized
an incision is made by a sharp cutting object. The margins ofan incision is made by a sharp cutting object. The margins of
the incision are usually relatively cleanthe incision are usually relatively clean
ContusionContusion
an injury caused by a blunt force that damages small bloodan injury caused by a blunt force that damages small blood
vessels and causes interstitial bleeding, usually withoutvessels and causes interstitial bleeding, usually without
disruption of the continuity of the tissue (disruption of the continuity of the tissue (cfcf ecchymosis)ecchymosis)
56.
57. Adult Mortality Rates in the United States, Ages 25–44, in 1998
Rate per 100,000 population
Cause Hispanic Black White
Unintentional injuries 33.4 40.1 31.6
Cancer 16.8 38.0 25.3
Homicide 13.1 36.2 4.7
Human immunodeficiency virus 12.1 43.3 4.8
Heart disease 10.3 43.5 18.3
Suicide 7.8 — 17.0
Total 130.2 303.7 139.4
Data from CDC Fact Book, 2000/2001, Department of Health and Human Services,
Centers for Disease Control and Prevention.
59. BURNS 1st
, 2nd
, 3rd
, 4th
“Degree”
FULL vs. PARTIAL Thickness
Survival
PERCENT of body using the rule of NINES
DEGREE (i.e., Depth)
Respiratory Tract Involvement
AGE
Speed of access to Burn Unit
Immune System (Pseudomonas, S. aureus,
Candida)
60. HYPER-THERMIA
HEAT
CRAMPS: Electrolyte loss via sweat
EXHAUSTION: Water depletion and lack
of cardiovascular compensation
“STROKE”: Extensive peripheral
vasodilatation, i.e., “shocky”, very serious,
T>106º, over 110º have been reported, high
mortality.
61. HYPO-THERMIA
Often in setting of
homelessness or alcoholism
or both
< 90º often fatal, assoc. w.
BRADYCARDIA
ATRIAL FIBRILLATION
64. ALTITUDE ILLNESS
Caused by LOW Oxygen Tension
HIGH ALTITUDES (>4000 m)
OBTUNDATION
INCREASED CAPILLARY PERMEABILITY
ACUTE PULMONARY EDEMA (HAPE)
Q: What is the name of the base camp at Mt. Everest
A: Pulmonary Edema
65. BLAST INJURIES
RELATED TO RAPID ATMOSPHERIC
PRESSURE CHANGES
LUNGS
VISCERA, especially GAS filled viscera
Rupture, Hemorrhage, etc.
IMMERSION BLAST also possible,
causing more of a total body compression
syndrome
66. DECOMPRESSION
Related to GAS SOLUBILITY in divers
ascending rapidly, especially the more
NON-SOLUBLE gasses, like NITROGEN,
and, to a lesser extent, XENON
AIR EMBOLISM is the common pathology
ACUTE:
“BENDS” (peri-articular), acute
“CHOKES” (lungs), acute
“STAGGERS” (inner ear), acute
CHRONIC:
ASEPTIC NECROSIS: humeri, femurs
67. NUTRITIONNUTRITION & DISEASE& DISEASE
Food SafetyFood Safety
AdditivesAdditives
ContaminantsContaminants
Nutritional DeficienciesNutritional Deficiencies
VitaminsVitamins
MineralsMinerals
ObesityObesity
Diet and DiseaseDiet and Disease
Chemoprevention of CancerChemoprevention of Cancer
68. Vitamin Deficiency and ExcessVitamin Deficiency and Excess
Fat soluble vitaminsFat soluble vitamins
A, D, E, KA, D, E, K
readily stored in body fatreadily stored in body fat
poorly absorbed in digestive disorders involvingpoorly absorbed in digestive disorders involving
malabsorbtion of fatmalabsorbtion of fat
Water soluble vitaminsWater soluble vitamins
remaining vitaminsremaining vitamins
readily excreted in urinereadily excreted in urine
Vitamin storesVitamin stores
vitamins B-12 and A: stores sufficient for 1 yearvitamins B-12 and A: stores sufficient for 1 year
folate and thiamine may become depletedfolate and thiamine may become depleted
within weeks when eating a deficient dietwithin weeks when eating a deficient diet
69. Vitamin D MetabolismVitamin D Metabolism
Absorption of vitamin D in the gut orAbsorption of vitamin D in the gut or
synthesis from precursors in the skinsynthesis from precursors in the skin
Binding to a plasma α1 -globulin (D-Binding to a plasma α1 -globulin (D-
binding protein) and transport to liverbinding protein) and transport to liver
Conversion to 25-hydroxyvitamin D,Conversion to 25-hydroxyvitamin D,
25(OH)D (calcidol) by 25-hydroxylase in25(OH)D (calcidol) by 25-hydroxylase in
the liverthe liver
Conversion of 25(OH)D to 1,25(OH)Conversion of 25(OH)D to 1,25(OH)22 DD
(calcitrol, Vitamin D3) by α1-hydroxylase(calcitrol, Vitamin D3) by α1-hydroxylase
in the kidney;in the kidney; biologically this is the mostbiologically this is the most
active form of vitamin Dactive form of vitamin D..
70. Functions of Vitamin DFunctions of Vitamin D
Stimulates intestinal absorption of calciumStimulates intestinal absorption of calcium
and phosphorusand phosphorus
Collaborates with PTH in the mobilizationCollaborates with PTH in the mobilization
of calcium from boneof calcium from bone
Stimulates the PTH-dependent reabsorptionStimulates the PTH-dependent reabsorption
of calcium in the distal renal tubulesof calcium in the distal renal tubules
1,25(OH)1,25(OH)22 D, the biologically active form ofD, the biologically active form of
vitamin D, is best regarded as a steroidvitamin D, is best regarded as a steroid
hormone which acts by binding to a high-hormone which acts by binding to a high-
affinity receptoraffinity receptor
71.
72. Vitamin D DeficiencyVitamin D Deficiency
Holick et al (2005) reported the results of aHolick et al (2005) reported the results of a
large North American study that assessedlarge North American study that assessed
the vitamin D status of postmenopausalthe vitamin D status of postmenopausal
women receiving therapy to treat or preventwomen receiving therapy to treat or prevent
osteoporosisosteoporosis
52% of 1536 women had inadequate52% of 1536 women had inadequate
[25(OH)D] levels (<30 ng/mL)[25(OH)D] levels (<30 ng/mL)
36% and 18% had levels less than 25 and 2036% and 18% had levels less than 25 and 20
ng/mL, respectively.ng/mL, respectively.
Holick MF et al: J Clin Endocrinol Metab 90:3215, 2005
73.
74. Vitamin D DeficiencyVitamin D Deficiency
Childhood: RicketsChildhood: Rickets
epiphyses are openepiphyses are open
cartilage overgrowthcartilage overgrowth
Adults:Adults: osteomalaciaosteomalacia
bone matrix is not calcifiedbone matrix is not calcified
vs osteoporosis (matrix reduced)vs osteoporosis (matrix reduced)
ADULTS
CHILDREN
(RICKETS)
OSTEOMALACIA
1) Bone fractures that happen
with very little injury
2) Muscle weakness
3) Widespread bone pain,
especially in the hips
75. Vitamin KVitamin K
Clotting factors VII, IX, and X andClotting factors VII, IX, and X and
prothrombin (II) all require carboxylation ofprothrombin (II) all require carboxylation of
glutamate residues for functional activityglutamate residues for functional activity
anticoagulant coumadin is a Vitamin Kanticoagulant coumadin is a Vitamin K
antagonistantagonist
Activation of anticoagulant proteins C and SActivation of anticoagulant proteins C and S
also requires glutamate carboxylationalso requires glutamate carboxylation
SourcesSources
endogenous intestinal bacterial floraendogenous intestinal bacterial flora
dietdiet
76. Vitamin K DeficiencyVitamin K Deficiency
CausesCauses
fat malabsorptionfat malabsorption
reduced gut bacterial florareduced gut bacterial flora
administration of wide specturm antibioticsadministration of wide specturm antibiotics
neonatal period before gut is colonizedneonatal period before gut is colonized
liver disease with reduced recycling of vitamin Kliver disease with reduced recycling of vitamin K
Effects of vitamin K deficiencyEffects of vitamin K deficiency
bleeding diathesisbleeding diathesis
estimated 3% prevalence of vitamin K-estimated 3% prevalence of vitamin K-
dependent bleeding diathesis among neonatesdependent bleeding diathesis among neonates
warrants routine prophylactic vitamin K therapywarrants routine prophylactic vitamin K therapy
for all newbornsfor all newborns
Notas del editor
A xenobiotic is a chemical which is found in an organism but which is not normally produced or expected to be present in it.
One of the most common Phase I reaction is hydroxylation catalysed by the cytochrome P-450-dependent mixed-function oxidase system. These enzyme complexes act to incorporate an atom of oxygen into nonactivated hydrocarbons.
In subsequent phase II reactions, these activated xenobiotic metabolites are conjugated with charged species such as glutathione (GSH), sulfate, glycine, or glucuronic acid.
Some sources will add Phase III as the final excretion stage.
This is actually not a bad diagram, fairly logical.
The threshold is the dose at which toxic effects are noted clinically. Below this dose, no adverse effects are noted (sub threshold). This is a basic Pharm 101 graph.
Just in case you need, at parties, to rattle of specific tar chemicals proven to be carcinogens.
The asterisk represents one of my favorite rants. The only fucking thing ONE or TWO drinks per day ever led to was THREE or FOUR.
Many people living in denial (i.e., alcoholics) are violently opposed to defining alcoholism at &gt;2* drinks per day, so probably the TRUEST definition of alcoholism is subjective but involves impairment and degradation of family and social relationships. Most alcoholics living in denial devote most of their brilliant brain power proving to themselves and the world that they are NOT alcoholic.
*2 beers, 2 wines, 2 shots
At clinically important alcohol concentrations, microsomal and ADH enzymes are saturated and show zero order kinetics, i.e. metabolism proceeds at a constant rate and is independent of alcohol concentration.
Note: Robbins states 8 bottles of beer is needed to reach legal limit for intoxication, a dangerous overestimation
Medical measurements use mg/dl in plasma, whereas legal definitions use percentage (volume/volume) in whole blood
To estimate the alcohol level in whole blood using the alcohol level in blood plasma, divide by 1.16
What is “a drink”? Ans: “A drink” is 1.5 oz of 80 proof (i.e. 40%) ethanol, a 12 oz. can of beer, or a 5 oz. glass of wine.
Remember this number if you drive.
Widmark took all the logical factors contributing to alcohol concentration in the blood and put them into an equation:
N = the number of drinks consumed
W = body weight in ounces
r = volume of distribution (a constant relating the
distribution of water in the body in L/Kg)
Ct = the blood alcohol concentration (BAC) in Kg/L
β = the alcohol elimination rate in Kg/L/hr
t = time since the first drink in hours
z = the fluid ounces of alcohol per drink
0.8 = the density of ethanol (0.8 oz. per fluid ounce)
Factors of fatty change.
Liver with extensive macrovessicular fat. Nearly all of the hepatocytes in this field are filled with a large clear lipid vacuole. The vacule is clear because the fat has been removed in tissue processing.
If you estimate that 50% of the histologic cross area of this slide is “clear”, i.e., “fat”, and the liver weighs, say 2000 gm. (normal = 1400-1800), then you can say 1000 gms are fat, right? Ans:YES
Point out the microvesicular and macrovescicular fat.
Liver with alcoholic hyaline (Mallory bodies), fatty change, and focal hepatocyte necrosis and inflamation.
They are highly eosinophilic and thus appear pink on H&E stain. The bodies themselves are made up of intermediate keratin filament proteins that have been ubiquinated, or bound by other proteins such as heat shock proteins, or p62.
There are nodules of regenerated hepatocytes (R)surrounded by fibrous bands (F). This pattern of regeneration and repair results from a previous episode or episodes of hepatocellular necrosis which destroyed liver heptocytes and their architectural framework. Alternatively there may have been chronic and ongoing necrosis of hepatocytes. Residual hepatocytes eventually regenerate in nodules surrounded by fibrosis.
Previous teaching was that estrogen had a cardio-protective effect since it raises high density lipoproteins (HDL, good cholesterol). This is an example of how the use of a surrogate marker can be misleading.
Indoor air pollution is increased by current construction methods in which the house is sealed from the outside for energy efficiency
Basophilic stippling is RIBOSOMES, gingival “lead” lines are at tooth-gingiva brder, x-ray “lead” lines are the densities at the metaphyses
What is pica? ANS: It is NOT a type of typewriter font, NOT a genus of magpie, or a city in Chile or England.
Pica is a medical disorder characterized by an appetite for substances largely non-nutritive (e.g., clay, coal, soil, feces, chalk, paper, soap,mucus, ash, gum etc.)
The cells that “turn over” the most rapidly are generally those most sensitive to radiation, e.g., bone marrow, GI mucosa.
Vascular damage and parenchymal atrophy are seen with therapeutic radiation. A whole body exposure sufficient to cause these changes would be lethal before these changes could appear.
Injuries can be considered as “exposures” too, to keep in tune with the rest of this chapter.
Look at the amazing black/white differences in HIV and Homicide for USA people &lt;44
Historically in the USA, young adults do not die from medical diseases, but that is changing, with HIV and cancer.
Nothing gives me more pleasure than to show this slide to prove that crime deductions are a very miniscule part of REAL PATHOLOGY, not the majority of it, like most TV heads suspect.
First Degree----erythema (redness), epidermal damage only
Second Degree---(blisters), superficial (papillary) and deep (reticular) dermis involved
Third Degree----charring, subcutis (hypodermis) involved
Fourth Degree---- (FULL thickness), tendons, etc., involved.