immune system asepsis. pretest 1. define nosocomial infection 2. identify what dtp stands for 3....
TRANSCRIPT
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IMMUNE SYSTEMASEPSIS
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PRETEST 1. Define Nosocomial infection 2. Identify what DTP stands for 3. Identify the most common Nsg.
Intervention to prevent infection 4. Define sensory deprivation 5. Give one example of a Nsg.
Procedure that uses surgical asepsis.
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PRETEST ANSWERS 1. Acute care or hospital acquired. 2. Diptheria, Tetanus, Pertussis 3. Handwashing 4. Mental alteration resulting from
severely decreased stimulation 5. Invasive procedures: Starting an
IV, injections, urinary catheterization
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IMMUNITY:DEFINITION
Specific resistance of the body to infectious agents
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SUSCEPTIBILITY:DEFINITION
Degree to which an individual can be affected
likelihood of an organism causing an infection in that person
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CHAIN OF INFECTION6 LINKS
1. Etiologic agent (microorganism) 2. Reservoir (source) 3. Portal of exit from reservoir 4. Method of transmission 5. Portal of entry to the susceptible
host 6. Susceptible host
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ETIOLOGIC AGENT BODY SOURCES (6)
1.Respiratory tract 2.GI tract 3.Urinary tract 4.Reproductive tract (including
genitals) 5.Blood 6.Tissue
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RESERVOIRS & PORTALS OF EXIT (5)
1.Respiratory tract= nose/mouth, Endotracheal tubes or tracheostomies
2.GI tract= Mouth per saliva, vomitus, anus/ostomies: feces, drainage tubes (eg, NG or T-tubes)
3.Urinary tract= Urethral meatus & urinary diversion ostomies
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Con’t 4. Reproductive tract= vagina: vaginal
discharge; may be further transported by urine; urinary meatus: semen, urine
5. Blood= open wound, needle puncture site, any disruption of intact skin or mucous membrane surfaces
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METHODS OF TRANSMISSION (3)
Direct Transmission= 1. Immediate & direct contact
2. Droplet spread if source & host within 3 ft of each other
Indirect Transmission=
1. Vehicle borne = fomites
2. Vector-borne=animal, flying or crawling insect that serves as an intermediate means of transporting agent
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(con’t) Airborne Transmission= droplet
nuclei or residue of evaporated droplets that
may remain in air for long periods of time emitted by infected host or dust particles containing the infectious agent are transmitted by air currents to a suitable portal of entry
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BREAKING THE CHAIN OF
INFECTION
First link broken by use of antiseptics, disinfectants and sterilization
Aim of most isolation precautions & many hospital practices for infection prevention & control is breaking chain during transmission phase of cycle
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ANTISEPTIC AGENTS VS DISINFECTANTS
Antiseptics= agents that inhibit growth of some microorganisms
chemical preparation used on skin or tissue
Disinfectants= agents that destroy pathogens other than spores
chemical preparation used to treat inanimate objects
more concentrated solution=can be toxic & caustic to tissue
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BACTERICIDAL VS BACTERIOSATIC
Bactericidal= destroys bacteria
Bacteriostatic= prevents growth & reproduction of some bacteria
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ANTISEPTICS & DISINFECTANTS
– “Commonly Used Antiseptics and Disinfectants, Effectiveness, and Use
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STERILIZATION Process that destroys all micro org.
including spores & viruses METHODS (4): 1. Moist heat (steam) 2. Boiling water 3. Gas 4. Radiation
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INFECTION RISK FACTORS HOST SUSCEPTIBILITY: age,
heredity, stress level, nutritional status, immunization status, current medical therapy, pre existing disease processes, & some past or recent surgical interventions
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POPULATIONS AT RISK FOR INFECTION
Elderly, the very young poorly nourished individuals individuals with deficiency of serum
immunoglobulins individuals with insufficient immunizations or
existing disease process Individuals with multiple stressors Individuals with certain medical therapies
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MEASURES THAT REDUCE A PERSON’S SUSCEPTIBILITY
Adequate hygiene Administration of immunizations on a
timely basis Nutrition that is balanced and
adequate Fluid intake that is adequate Rest and sleep that are adequate Reduce stress
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STAGES OF AN INFECTIOUS PROCESS (4)
1. Incubation period=time between entry of microorg. Into body & onset of s/s
2. Prodromal Period=time from onset of nonspecific s/s until specific symptoms of infection appear
3. Illness Period=specific s/s develop & become evident: localized s/s & systemic s/s
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(Con’t) 4. Convalescent Period=extends
from time s/s start to abate until person returns to normal state of health
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NORMAL BODY DEFENSES
Nonspecific= intact skin & mucuous membranes, nasal passage cilia, lung alveolar macrophages & phagocytes, oral cavity lactoferrin & shedding, tears, GI pH,vaginal pH, inflammation
Specific= 1. Active: natural vs
artificial 2. Passive: natural
vs Artificial
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STAGES OF INFLAMMATION
1. Vascular & cellular responses 2. Exudate a. Serous b. Purulent c. Hemorrhagic d. Serosanguineous 3. Reparative
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LEUCOCYTOSIS Abnormally high levels of white blood
cells (leukocytes)= inflammation Normal WBC count can go from 4500-
11,000 per cubic millimeter of blood to 20,000 or more
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IMMUNIZATIONS INITIAL
HBV=Hep B-1,Hep B-2=Hep B-3= Hepatitis B= birth
DTP= Diptheria, Tetanus, Pertussis=2,4,6 months
Hib= Haemophilus Influenzae type b=2,4, 6 months
OPV=Oral Poliovirus=2, 4, 6 months MMR= Measles, mumps, rubella=12 mo.
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(Con’t) Varicella Zoster Virus Vaccine= 12-
18 months
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BOOSTER SHOTS HBV= health care workers draw titer &
immunize with each exposure DTP= 12 months, 4-6 yrs; Tetanus
toxoid every 10 years thereafter Hib= 12-15 months (Depending on
type used) OPV= 4-6 yrs MMR= 4-6 yrs or 11-12 yrs
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NOSOCOMIAL INFECTION:DEFINITION
Infections that are associated with the delivery of health care services in a health care facility
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NOSOCOMIAL INFECTION ORIGINS
Endogenous Source= from the clients themselves
Exogenous sources= microorganisms originate from the hospital environment and personnel
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IATROGENIC INFECTIONS Nosocomial infections that are due to
any aspect of medical therapy Example: Bacteremia resulting from
an IV line Other contributing factors: Presence of
compromised hosts, insufficient hand washing or poor healthcare provider compliance with asepsis
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MAJOR SITES FOR NOSOCOMIAL INFECTIONS (4)
1. Respiratory tract 2. Urinary tract 3. Bloodstream 4. Surgical or open wounds
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RISK FACTORS THAT CONTRIBUTE TO NOSOCOMIAL
INFECTION
1. Invasive procedures 2. Medical therapies 3. Existence of large number of
susceptible persons 4. Inappropriate use of antibiotics 5. Insufficient hand washing after
client contact & after contact with body substances
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LOCALIZED vs SYSTEMIC INFECTIONS: DEFINITIONS
Localized: Infectious Process in only the affected body organ or area
Example: abscess of big toe of right foot
Systemic: Infectious process in the entire body
Example: bacteremia
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S/S OF LOCAL VS SYSTEMIC INFECTION
Local infection= localized swelling, localized redness, pain or tenderness with palpation or movement, palpable heat of affected part, loss of function of affected body part, wound drainage
Systemic infection= ^ TPR,lassitude, malaise, loss of energy
anorexia & n/v enlargement &
tenderness of lymph nodes that drain area of infection
see Kozier pg. 641
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LABORATORY DATA ^LEUCOCYTE COUNT
1. ^Neutrophils=acute suppurative infection 2. Neutrophils Decrease=acute bacterial
infection in elderly 3. Lymphocytes=^ in chronic bacterial &
viral infection 4. Monocytes ^ in some protozoal &
rickettsial infections & TB
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(Con’t) 5. Eosinophils= unaltered in infectious
process 6. Basophils= unaltered in fection
process
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^ ERYTHROCYTE SEDIMENTATION RATE (ESR)
Rate increases in presence of an inflammatory process
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CULTURE & SENSITIVITY STUDIES
Specimens of: urine, blood, sputum, or other body drainage= cultures microorganisms in special growth medium to indicate presence of pathogenic microorganisms and chemical substance they are susceptible to
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ASEPSISDEFINITION
Freedom from infection or infectious material
Example: handwashing
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MEDICAL ASEPSIS vs SURGICAL ASEPSIS
All practices intended to confine a specific microorg. To a specific area, limiting the number, growth, & transmission of microorganisms
Example: 2-minute handwashing
Practices that keep an area or objects free of all microorg.; it includes practices that destroy all microorg and spores
Example: Invasive procedures=IV starts, injections urinary cath.
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RELEVANT NANDA NURSING DIAGNOSES
High risk for infection Altered oral mucous membranes High risk for altered body temperature Impaired skin integrity Impaired tissue integrity Impaired physical mobility Altered nutrition: less than body
requirements
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(Cont’) Pain Social isolation Diversional Activity deficit Self-esteem disturbance Anxiety Fear Hopelessness
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NURSING INTERVENTIONS TO PREVENT INFECTION
Discuss risk factors which place pt. at risk for infection
Teach Pt.: purpose of meds, monitoring of health status, drsg. Chges., TCDB, frequent repositioning, isolation precautions
Monitor VS & skin color q shift for s/s of infection
Assess lab values for s/s of infection=CBC, cultures
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(Cont’d) Ask Pt. About presence of subjective clinical
s/s of infection (chills, malaise, lethargy) Assess & document s/s of localized
infection(auscultate lungs & inspect urine, sputum & other drainage for alterations in color & consistency)
Inspect skin for s/s inflammation & impaired tissue integrity
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(Cont’d) Collect wound, sputum, urine & other
specimens as ordered for C & S and report abnormalities
Assess Pt.’s immunization status & life-style practices
Develop & implement plan to teach Pt. About proper nutrition =high-protein, high-vitamin diet, adequate fluid intake, proper hygiene & importance of rest
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Medical asepsis
METHODS OF KILLING OR REDUCING INFECTIOUS
AGENTS
Medical asepsis Surgical asepsis Use of Medications: antibiotics,
antivirals, antifungals
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ANTIBIOTIC:DEFINITION
Natural or synthetic substance that has the capacity to inhibit the growth of or kill other microorganisms
Synonyms: anti-infectives, antimicrobials antibacterials
Several different characteristics may be used to classify antibiotics
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RX CLASSIFICATION CHARACTERISTICS (3)
1. Spectrum of activity=Broad vs narrow spectrum
2. Antimicrobial activity= Bacteriostatic vs bacteriocidal
3. Mechanism of action= (5)=inhibition of bacterial cell wall synthesis, alt. in cell membrane function,
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(con’t) Inhibition of protein synthesis,
inhibition of nucleic acid metabolism, interference with intermediate cell metabolism ( Malseed, et., al. Pharmacology Drug Therapy and Nursing Considerations, 1995 pg.583).
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LIPPINCOTT’S NSG. GUIDEANTIBIOTIC CLASSIFICATION
(9) 1. Penicillins 2. Sulfonamides 3. Tetracyclines 4. Cephalosporins 5. Aminoglycosides 6. Fluoroquinolones 7. Lincosamides
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(Con’t) 8. Macrolides 9. Antibacterials
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ANTIBIOTICS & NSG. 1. Necessity of therapy; Prophylactic
antibiotic use vs Tx of infection 2. Identification of pathogen & sensitivity 3. Dosage & duration of therapy, level
monitoring 4. Hypersensitivity reactions 5. Organ toxicity 6. Superinfection 7. Resistance
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CENTERS FOR DISEASE CONTROL (CDC)
Principal public health agency at the national US level concerned with disease prevention and control
Roles: 1. Develop policy re. Communicable
Diseases 2. Research 3. Educate public and healthcare providers
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(Con’t) 4. Maintain national data bank on
prevalence and incidence of communicable diseases
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ISOLATION:DEFINITION
Measures designed to prevent the spread of infections or potentially infectious microorg. to health personnel, clients & visitors
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DISEASE SPECIFIC ISOLATION PRECAUTIONS
Provide for precautions for specific diseases
Example:pulmonary TB Precautions= Placing Pt. In private room with special ventilation or having Pt. Share a room with other Pt.s who are infected with same organism & use of special masks by staff entering room & gowning only to prevent gross soilage of clothes; no gloves indicated
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CATEGORY-SPECIFIC ISOLATION
PRECAUTIONS Based on 7 categories: 1. Strict isolation 2. Contact isolation 3. Respiratory isolation 4. TB isolation 5. Enteric precautions 6. Drainage/secretions precautions 7. Blood/body fluid precautions
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UNIVERSAL PRECAUTIONS
Apply to those body fluids associated with bloodborne pathogens= Hepatitis B virus, Hepatitis C virus and HIV
Applicable body fluids= blood, semen vaginal secretions cerebrospinal fluid, synovial fluid, pleural fluid,pericardial fluid, peritoneal fluid, amniotic fluid, saliva, body fluids containing blood & body fluids where it is difficult to differentiate among body fluids
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(Con’t) NonApplicable body fluids= any fluid not
mentioned in above list unless they contain visible blood; these fluids are normally not associated with the transmission of bloodborne pathogens
Apply to all Pts to < transmission of unidentified pathogens
see Kozier page 651 CLINICAL GUIDELINES Universal Precautions
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(Con’t) CDC recommends universal
precautions be used in conjunction with disease-specific or category-specific precautions and not replace them
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OSHA STANDARDS BLOODBORNE PATHOGEN
EXPOSURE
Regulations to protect health care workers from occupational exposure to bloodborne pathogens
adapt CDC’s Universal Precautions+avoiding injury due to sharp instruments, measures to take in case of exposure to bloodborne pathogens & communication of biohazards to employees
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BODY SUBSTANCE OR BODY FLUID ISOLATION
Employs generic infection control precautions for all Pts. except those with the few diseases transmitted through air
Purposes:Prevent cross-transmission of microorg. & protect health care worker from microorg. harbored by Pts.
Body substance=blood & body fluids & substance, urine, feces, wound drainage, oral secretions
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(Con’t) When BSI precautions are used,
category-specific & disease-specific precautions are not required
Sufficient for all clients except those who have certain airborne disease= pulmonary TB & varicella or chicken pox
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ISOLATION PRECAUTIONS IN HOSPITALS 1996
Standard precautions= Tier I
apply to all hospital persons
apply to blood, all body fluids, secretions & excretions except sweat, non-intact skin & mucous membranes
Transmission-Based Precautions= Tier II
Used in addition to Standard Precautions for Pts. With known or suspected infection that are spread by any of the following: airborne, droplet or contact
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ISOLATION PRECAUTIONS (con’t)
Standard precautions
combine the major features of UP Universal Precautions & BSI
The three types of transmission-based precautions may be used alone or in combination but always in addition to Standard Precautions
Encompass all conditions or diseases listed in category-specific or disease specific
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AIRBORNE, DROPLET & CONTACT PRECAUTIONS
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BARRIER TECHNIQUE (REVERSE ISOLATION)
Protect compromised Pt.s from microorg. On health care personnel and non sterile items
Pts. with leukemia, extensive skin impairments
Use Standard Precautions and Transmission/Based Precautions
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IMPLEMENTING ISOLATION PRECAUTIONS
Handwashing=Most effective infection control measures: CDC 10 secs using bar soap, granule soap, soap filled tissues or antimicrobial liquid soap
Wash hands: before eating, after using bedpan or toilet, after contact with any body substances, before and after care (even if gloves were used)
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(Con’t) Wash from clean to dirty by holding hands down below elbows Surgical asepsis hands held above
elbows so H2O runs from cleanest to least clean
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FACE MASKS Worn to reduce risk for transmission of
organisms by droplet contact, air-borne routes & splatters of body substances
Wear under following conditions: 1. Only by those close to Pt. If
infection is transmitted by large-particle aerosols (droplets)
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FACE MASK (Con’t) 2. By all persons entering room if
infection is transmitted by small-particle aerosols (droplet nuclei)– CDC recommends using a disposable
dust/mist particulate respirator when caring for any Pt. who has pulmonary TB
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NONDISPOSABLE SURGICAL MASKS
Effective for droplet transmission & splatters but are not effective against airborne microorganisms
CLINICAL GUIDELINES: Using disposable masks
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EYEWEAR Protective eyewear (goggles or
glasses) and masks by be indicated in situations where body substances may splatter the face
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GOWNS Single-use= non
reusable paper gowns
worn during procedures when staff’s uniform is likely to become soiled
Discarded into trash Wash hands after use
Sterile gowns: reusable cloth or paper
use for strict sterile technique
use for barrier technique or reverse isolation
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GLOVES Non-sterile or
clean or rectal used for most
activities no special
technique required for donning
Sterile gloves used when the hands
will come in contact with an open wound or when the hands might introduce microorg. Into a body orifice
require special technique to don
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SOILED EQUIMENT & SUPPLIES
Essential to: 1. Prevent inadvertent exposure of
health care workers to articles contaminated with body substances
2. To prevent contamination of the environment
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PSYCH IMPLICATIONS OF ISOLATION (2)
Result of separation from others & of the special precautions taken in their care
1. Sensory deprivation 2. Decreased self-esteem related to
feelings of inferiority
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SENSORY DEPRIVATION Occurs when the environment lacks
normal stimuli for the client Example: frequent communication
with others S/S: boredom, inactivity, slowness of
thought, daydreaming, increased sleeping, thought disorganization, anxiety, hallucinations and panic
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FEELING OF INFERIORITY Due to the perception of infection itself
or to the required precautions Pt. Feels “soiled”, “contaminated” or
“dirty” and that they are at fault and substandard
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NSG INTERVENTIONS TO < ISOLATION PSYCH PROBLEMS
1. Assess Pt’s.need for stimulation 2. Initiate measures to help meet need for
stimulation= reg. Communication with Pt & diversional activities, stimulate visual sense
3. Explain the infection & associated procedures to help clients & their support persons understand & accept the situation
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(Con’t) 4. Demonstrate warm, accepting
behavior. Avoid conveying to the Pt. Any sense of annoyance about the precautions or any feelings of revulsion about the infection
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WAYS TO ID STERILITY OF ITEMS IN HEALTH CARE
SETTING (3) 1. Ensure that pckg. is clean & dry; if moist
considered contaminated & must be discarded.
2. Check the sterilization expiration dates on pckg. & look for any indications that it has been previously opened
3. Follow agency practice about the disposal of possibly contaminated pckgs.
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PRINCIPLES & PRACTICES OF SURGICAL ASEPSIS (9)
1. All objects used in a sterile field must be sterile
2. Sterile objects become unsterile when touched by unsterile objects
3. Sterile items that are out of vision or below the waist level of the nurse are considered unsterile
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(Con’t) 4. Sterile objects can become unsterile by
prolonged exposure to airborne microorg. 5. Fluids flow in the direction of gravity. 6. Moisture that passes through a sterile
object draws microorg. from unsterile surfaces above or below to the sterile surface by capillary action.
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(Con’t) 7. The edges of a sterile field are
considered unsterile. 8. The skin cannot be sterilized & is
unsterile. 9. Conscientiousness, alertness, &
honesty are essential qualities in maintaining surgical asepsis.
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INFECTION CONTROL NURSE: ROLE IN
HOSPITAL SETTING Infection prevention 1. Education of
staff & pts. 2. Write policy re.
Infection control procedures
Infection Control 1.Surveillance of
prevalence & incidence of infections
2. Reporting to CDC as per guidelines