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49 Cards in this Set

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Infectious Disease (definition)
Disorders in which cell injury is caused by a pathogen
Definition of Pathogen, Resident (Normal) Flora
Pathogen = any disease producing microorganism
Resident (normal) Flora = Mocroorganisms that live in or on the host without causing disease. Establish a mutually beneficial relationship with the host, protecting the type of disease produced
Chain of Transmission - Steps (6)
Pathogen -> Reservoir -> Portal of Exit -> Mode of Transmission -> Portal/Mode of Entry -> Susceptible Host
Chain of Transmission - Examples of each step
Pathogen - Bacteria, Viruses, Fungi, Protozoans, Prions, Chlamydia, Rickettsia, Mycoplasmas, Helminths
Reservior - Humans, animals, plants, soil, food, organic substances
Portal of Exit - GI Tract, Genitourinary Tract, Respiratory Tract, Open Lesions
Mode of Transmission - Contact (direct/indirect), airborne, droplet, vehicle (water/food - direct/indirect), vectorborne (insects or animals)
Portal/Mode of Entry - mucous membranes, inhalation, ingestion, percutaneously, transplacentally
Susceptible Host - host characteristics, general health and nuturitional status, living conditions, personal behaviors
Infection (definition)
Infection = Invasion and multiplication of microorganism in body tissues
Subclinical Infection
-Latent Period
-Communicable Period
-Carrier
Subclinical Infection = Signs and symptoms not detectable by clinical exam, but lab tests reveal an immune response and/or the pathogen
Latent Period = Period during which the pathogen is inactive and manifestations of the disease are no longer detectable
Communicable Period - period during which a pathogen is capable of being transmitted
Carrier - individual who harbors the microorganisms of a disease without manifesting symptoms and is capable of transmitting the infection
Clinical Infection
-Incubation period
Clinical Infection = Signs/Symptoms are detectable by clinical examination
Incubation Period = Period between the pathogen entering the host and the appearance of the first signs and symptoms
Inflammation (definition)
Inflammation = A localized nonspecific protective response elicited by injury which serves to eliminate the injurious agent, remove the necrotic tissue, and initiate healing
Immune System Response
A specific response to individual pathogens, as long as the pathogens, as long as the pathogen has antigenic characteristics
Immunodeficiency may be caused by an infection
Bacteria
-Definition
-Growth
-Classified By
-Examples
Bacteria = single-celled prokaryotic microorganisms with cell walls
Grow - independently on artificial media without the need for other cells
Classified By - shape, response to staining, motility, tendency towards capsulation, capacity to form spores, oxygen utilization
Examples - C-diff, pseudomonas, salmonella, staphy, strep
Virues
-Definition
-Requirements
-Classified By
-Examples
Viruses - Subcellular organisms made up only of RNA or DNA contained in protein shell
Require - living cells in which to survive and replicate
Classified By - type of nucleic acid they contain and by shape of thier protein coat
Examples - hepatitis, herpes, HIV, influenza
Fungi (yeasts or molds)
-Definition
-Examples
Fungi = single-celled (oval-shaped) or multi-cellular (filamentous) eukaryotic microorganisms with cell walls
Examples - Candida Albicans, Histoplasmosis
Protozoans
-Definition
-Examples
Protozoans = single-celled eukaryotic microorganisms with cell membranes
Examples - cryptosporidiosis, pneumocystis carinii, toxoplasma gondii
Factors that Influence Host Susceptibility
Demographics
Personal Behaviors
Living Conditions
Host Risk Factors
Malnutrition, Chronic Illness (diabetes mellitus, cancer, heart disease, renal failure), Age (infants, elderly), Immunosuppression (immunodeficiency diseases, drug-induced, stress, splenectomy), Breaches of Bodies Integrity (catheters, tubes)
Pathogenesis depends on?
Capability of hte pathogen to bypass or inactivate the anatomic and physiologic defenses (lines of defense) of the body
Mechanisms of Spread (4)
-Contact and spread rapidly on wet epithelial surfaces (mucous membranes) and slowly on dry epithelial surfaces (skin)
-Microorganisms may not be able to travel beyond the epithelium, only proliferate in the epithelium, or penetrate the epithelium (independently or through an open cut or sore)
-Follow tissue planes of least resistance and the regional lymphatic and vascular anatomy
-Travel in the blood (free or carried by cells) to distant sites
Mechanisms of Injury (3)
-Contact or enter host cells and directly cause cell death
-Release endotoxins or exotoxins that kill cells at a distance and/or release enzymes that degrade tissue components
-Induce host cell responses that may cause additional tissue damage, usually by immune-mediated mechanisms
Clinical Manifestations:
Systemic
Symptoms: Fever, chills, malaise, enlarged lymph nodes
Result from: chemicals (endotoxins, exotoxins, cytokines) released from pathogen and immune system cells
Clinical Manifestations:
Regional - Musculoskeletal
(tendons & bursae, bone, joints, muscle)
Tendons & Bursae - pain, swelling
Bone - pain, swelling
Joints - pain, swelling, decreased ROM
Muscle - pain, swelling, decreased strength
Clinical Manifestations:
Regional - Nervous
(Brain & Meninges, Peripheral Nerves)
Brain & Meninges - Altered mental status and/or consciousness, headache, stiff neck
Peripheral Nerves - sensory, motor, and/or autonomic deficits
Clinical Manifestations: Regional - Skin
Skin Lesions
Purulent drainage from abscess, open wound, or skin lesion
Rash or red streaks
Itching
Clinical Manifestations:
Regional - Cardiovascular
Change in pulse rate, hypotension
Petechial hemorrhages
Clinical Manifestations:
Regional - Pulmonary
Tachypnea, dyspnea, cough, sputum production, chest pain, hoarseness, sore throat, nasal drainage
Diagnosis: Lab Tests and what they detect (3)
1) Cultures - microorganism
2) Microscopic exam of tissue fluids and/or excised tissue - microorganism, evidence of microorganism, immune response to microorganism
3) Immunologic Tests (body fluids, skin) - evidence of microorganism, immune response to microorganism
Treatment: Types (3)
1) Pharmacotherapy
2) Drainage or debridement (enzymatic, hydrotherapy, surgical)
3) Supportive Therapy - addressing the clinical manifestations of the infection
Treatment: Pharmacotherapy
-Types
-Effectiveness
-Antimicrobial or antibiotics
-Effectiveness: depends on etiologic agen and the system affected
-Antibiotic resistant bacteria
Treatment: Antibiotic- Resistant Bacteria (classification, association)
Classified according to the name of the drug and the associated resistant bacterial strain.
Associated with misuse and overuse of antibiotics in the treatment of infections or potential infections, resulting in a "survival of the fittest" bacterial strain
Prognosis
Varies depending on:
Host, etiologic agent, system affected
Rehabilitation Issues
-Receive appropriate immunizations
-Be observant of precautions
-Be aware of the clinical signs and symptoms of infectious pathologies and potential secondary complications
Pulmonary Tuberculosis: Definition
An infectious, inflammatory systemic disease that affects the lungs and may desseminate to involve lymph nodes and other organs
Pulmonary Tuberculosis: Classification - Primary
Initial infection wiht mycobacterium tuberculosis, usually asymptomatic and almost always remains quiet after the development of a hypersensitivity to the microorganism
Pulmonary Tuberculosis: Classifications - Secondary
Develops as a result of either endogenous or exogenous reinfection by mycobacterium tuberculosis. Can occur decades after initial infection, particularly when the immune system is weakened. Most common form of clinical TB
Pulmonary Tuberculosis: Risk Factors
HIV+, Age (>65)
Pulmonary Tuberculosis: At Risk Populations (9)
Economically disadvantaged or homeless, non-white populations, foreign-born individuals, substance abusers, children (< 5 years), current or past prison inmates, peoiple with diabetes mellitus, end-stage renal disease, and immunocompromised
Pulmonary Tuberculosis: Transmission
qInhalation of infected airborne particles
Pulmonary Tuberculosis: Initial Infection
Mycobacterium Tuberculosis establishes itself in alveoli of the lungs
Epithelial cells encapsulate the bacteria
Pulmonary Tuberculosis: Progression in the Presence of an Intact Immune System
Lymphocytes and macrophages form granulomas around the encapsulated bacteria, rendering the infection inactive (latent). +ppd, -CXR
Pulmonary Tuberculosis: Progression if Infection Not Controlled By Immune System
Granulomas become nectrotic and eventually produce fibrosis and calcification of the tissues
Spread to other regions of the body
Pulmonary Tuberculosis: Clinical Manifestations (systemic, regional or pulmonary)
Often occur over 1 year after initial exposure
Systemic - Fever, malaise, anorexia, weight loss
Regional or Pulmonary - Cough, bloody sputum, pleuritic pain
Pulmonary Tuberculosis: Treatment
Pharmacotherapy - Active TB and certain cases of inactive TB - intense 6 months of meds
Surgery - multi drug resistant complications of TB
Pulmonary Tuberculosis: Prognosis
Good if infection is localized to the lungs and is treated
Not as good if multi-drug resistant strain, occurs in the aged, debilitated, or immunocompromised
Untreated - 50-80% fatal
Pulmonary Tuberculosis: Rehabilitation Issues
Perform a thorough chest assessment and musculoskeletal evaluation
Be aware of secondary effects of TB on the musculoskeletal system, such as disuse atrophy and decreased endurance
Viral Hepatitis: Definition & Classification
An acute or chronic inflammation of the liver caused by a virus
Classification: according to etiology, viral (several types), chemical (toxic), alcohol abuse, or autoimmune
Viral Hepatitis: Risk Factors of Hepatitis C (6)
Injection Drug Use, Received Blood Transfusion or Organ Transplant Before July 1992, Evidence of Liver Disease, Liver Transplant Recipient, Infants Born to HCV-Infected Mothers, Long-Term Kidney Dialysis
Hepatitis C: Transmission
Parenteral (inoculations, blood transfusions), Unidentified Exposure
Hepatitis C: Acute
Incuabation Period of 6-12 weeks
Virus establishes itself inside of hepatocytes, replicates, and causes cell injury
Inflammatory response and varying levels of tissue repair
>70% develop chronic Hepatitis (over 6 months)
Hepatitis C: Acute Clinical Manifestations
Malaise, Fatigue, Fever, Nausea, Vomiting, Diarrhea, Anorexia, Right Upper Quadrant Discomfort, Jaundice, Dark-Colored Urine, Light-Colored Stools (75% are subclinical or asymptomatic)
Hepatitis C: Chronic Clinical Manifestations
Fatigue, Malaise, Loss of Appetite, Bouts of Jaundice, Mild Hepatomegaly, Mild Splenomegaly
(May experience sporadic remission, no progression for years, rapid progression)