Chapter 4 Flashcards
A disease capable of being passed from one person to another
Caused by microorganisms
Infectious disease
Infection Control Goals
Karen Kelly, RN, BSN
- Reduce the risk of health care workers (student radiographers) acquiring an infection
- Reduce the incidence of transmitting healthcare worker (student radiographers) flora to patients
- Reduce the transmission of infectious pathogens from patient to patient
Drugs that tend to destroy microbes or prevent their multiplication
Antimicrobial drugs
Soluble substances derived from a mold or bacterium that kills or inhibits growth of other microorganisms
Antibiotics
3 types of infections
Nosocomial infection
Iatrogenic infection (type of nosocomial)
Community-acquired infection
Infections acquired in the course of medical care, hospital, clinic…..
Infections contracted @ birth by infants of infected mother
Nosocomial infection
Nosocomial infection that results from a particular treatment/therapeutic procedure
Iatrogenic infection
A person who enters a HC facility with an infection
Community-acquired infection
Microorganisms in everyone @ all times
Normal flora
Infections that are caused by microorganisms that are not normal flora
Exogenous nosocomial infection
A person acquires an infection in HC setting
Result of an overgrowth of normal flora or treatment w/broad-spectrum antimicrobial drug
Endogenous nosocomial infection
Drug effective against a wide variety of different microorganisms
Broad-spectrum antimicrobial drug
Flora acquired by contact w/object on which they present
Easy to remove from skin
Transient flora
Bacteria living on skin which not result in infection
Resident flora
2 Common sites of nosocomial infection
Bloodstream (venous access devices) Urinary tract (catheters)
Others frequent sites of nosocomial infection
Wounds following surgical procedures
Respiratory tract infections
4 factors that encourage nosocomial infection
- Environment (air)
- Therapeutic regimen (drug)
- Equipment
- Contamination during procedure
8 factors increase potential for nosocomial infection
- Age
- Heredity (genetic)
- Nutritional status (obesity)
- Stress
- Inadequate rest & exercise
- Personal habits (smoking)
- Health history
- Inadequate defenses (broken skin)
Microorganisms
Don’t fit any plant or animal kingdoms (3rd kingdom)
Used in food/drug to destroy waste
3rd kingdom or “Protista kingdom”
Plant or animal kingdom
Formulated by Haeckel
Protista kingdom includes
Bacteria Fungi Protozoa Helminths Viruses Prisons
4 major groups of microorganism produce disease
Bacteria
Fungi
Viruses
Parasites
Microscopic, single-celled organisms Endospores (resisting, allow to survive) Tuberculosis/Strep throat Colorless Minute
Bacteria
Cells require an oxygenated environment to live
Macroscopic or microscopic (mushroom)
Molds
Yeast
Fungi
Smallest microorganism Cannot visualize under any microscope Either DNA or RNA – never both Host cell Viral diseases include: influenza, common cold, mumps, measles, and Hepatitis
Viruses
Microorganisms produce diseases are called
Pathogenic
Pathogen
Pathogenicity
Primary source of material for the production of antibiotic drugs and to flavor various cheeses
Molds
Produce beer/wine; source of vitamins & minerals
Thrush
Yeast
Organisms that live on or in other organisms at the expense of the host organ
Can be a plant or animal
Animal parasites (animal) are pathogenic to humans
Parasites
5 elements needed to transmit infection
- Infectious Agent (human,plant,animal)
- Reservoir or an environment
- Portal of exit (nose/mouth)
- Means of transmission (direct/indirect)
- Portal of entry (equipment)
5 Means of Transmission
- Indirect
- direct
- Vehicle
- Airborne rout
- Vectors
Transfer by touching objects (fomites) that have been contaminated by an infected person (touch the photo of the pt)
Indirect transmission
Contact with infectious secretions that come from the eyes, nose or mouth of a host as they cough, sneeze or talk (nose/mouth/eye/hand)
Direct transmission
Transport infection
Food, water, drugs, contaminated blood (contain microorganism)
Vehicle transmission
Residue from evaporated droplets are suspended in air for long periods of time
Airborne transmission
Insect or animal carriers of disease
Vector transmission
4 stages of Disease Process
- Incubation stage
- Prodromal stage
- Full disease
- Convalescent stage
Stage of enters body & begins produce a diseas
Incubation stage
Stage of microorganism increases
Disease infected
Early symptom
Prodromal stage
Stage of disease full extent increase
Full disease stage
Stage of symptoms/disease diminish disappear
Micro goes to latent phase
Convalescent stage
HIV usually results in AIDS
Retrovirus
Destroys host cell and replicates while infecting other cells
HIV
Retrovirus have an enzyme complex are called
Reverse transcriptinase
5 phases of HIV
Phase 1: enters body & replicates in blood stream
PH 2: flu-like symptoms
PH 3: declining immune function & decrease # lymphocytes
PH4: weight loss, night sweat, rash…
PH5: immunosuppressed
5 RNA viruses
A,B,C,E,G
Inflammation of the liver cells
Viral Hepatitis
Caused by 5 RNA viruses
Virus is transmitted by fecal-oral route
A & E
New form of hepatitis
G
Same as B & C but longer incubation period
Which hepatitis HCWK most often contact from needle-stick injury
B
Hepatitis B & C
Most common blood-borne in US
Blood & sex
2 others nosocomial infection
MRSA
C-difff
Methicillin-resistant staphylococcus aureus (nursing home pt, increase in gym)
Super bug
Nursing home patients, dialysis patients, aged & debilitated, ICU patients, any patient hospitalized for a long period of time
MRSA (infection of skin)
Clostridium difficile
Antibiotics that predispose one by disrupting normal flora of intestinal tract
Frequent cause of nosocomial infections
Spore-forming bacteria that releases toxins into bowel
Resistant to disinfectants; easily spread by hands
C-diff (contact by hand)
Recurrent, chronic disease caused by Mycobacterium tuberculosis
Lungs (can’t affect area)
Pulmonary TB (student 1/year)
Asymptomatic; onset & early stages go unnoticed
Exposure of healthcare workers
Tuberculosis (TB)
MRSA in US
Death more than AIDS
Causes outside hospital
Most causes in gym showers & changing rooms
Reduce the number & spread of microorganisms
Microorganisms have been eliminated through the use of soap, water, friction, and various chemical disinfectants
Medical asepsis
Complete removal of microorganisms
Their spores from the surface of an object
Surgical asepsis
The best means of preventing the spread of microorganisms
Hand washing
How to Wash Your Hands
Wet with water Apply soap Rub at least 15 seconds Cover all surfaces of the hands and fingers Rinse and dry thoroughly Use paper towel to turn off water faucet
What does PPE stand for
Personal Protective Equipment
PPE includes
Gloves Gown Mask Shield To Creates a barrier between the patient and the healthcare worker
Which precaution based on the assumption that every patient has the potential for having an infectious disease.
Standard Precautions
What is Tier-1 precaution
Standard Precautions
Gloves
Used at all times on all patients
What is Tier-2 precaution
Transmission Based Precautions
Used when called for: Airborne, Contact, Droplet
Microbes are spread on evaporated droplets that remain suspended in air
Carried on dust in the air & may be inhaled by persons in the room or air space
TB, Chicken pox, measles
Airborne Isolation
Doors kept closed
Negative pressure isolation room
Patient wears surgical mask (filters expired air)
HCWK wears respiratory mask (N95)(filters inspired air)
Airborne Precaution
Droplets contaminated with pathogenic microorganisms are placed in the air from an infected person with a droplet-borne infection
Sneeze, cough, and talking
3 feet
Rubella, Pneumonia, Mumps, Influenza
Droplet precaution
Private room or a room with another patient infected with same disease
Mask (w/t 3 feet)
Droplet precaution
Private room or a room with another patient infected with same disease
Gloves
Gown
Contact precaution
Reverse/Protective Isolation/(Contact precaution)
Highly susceptible patients
Wash hands before and after
Gown/gloves/mask
No visitors/staff with signs or symptoms of an infection (cold, rash) in room
Teamwork approach
Expanded Precautions/Strict Isolation
Remove pathogenic microorganism from objects or body surface (spores/mechanical chemical process)
Disinfection