Health Care Associated Infections (Nosocomial infections)

By

Dr.Sabah M.A.AbdelkaderAssist. Prof. of Public Health

Objectives By the end of this lecture, students

should be able to: Define NCIs correctly. Recognize categories of NCIs. Discuss descriptive epidemiology of NCIs Identify components of NCIs control. Analyze effective control programs.

Introduction HAIs is cross infection of one patient by

another or by doctors, nurses and other hospital staff while in hospital.

A high frequency of NCIs is evidence of poor quality of health service delivery.

Many factors contribute to frequency of NCIs.

NCIs may be endemic or epidemic. Changes in health care delivery have

resulted in shorter hospital stay and increased outpatient care.

Definition Health Care Associated Infections

(HAIs) or nosocomial infections (NCIs) are infections that acquired in patients during or associated with delivery of health care which are not present at admission.

Infections occurring more than 48 hours after admission are considered NCIs.

Categories of HAIs Certain sites are particularly common: 1-Urinary Tract Infections: The most

common infection (30%) of HAIs is mainly due to use of catheters.

2-Surgical Wound Infections: The second most common HAIs.

Cont. 3-Lower Respiratory Infections: Pneumonias

are responsible for 15% of HAIs. The most common fatal HAIs( case fatality rate

of about 30%). Endotracheal intubations is a risk factor for

pneumonia. 4-Bloodstream Infections: It is the most

common site of HAIs among neonates in high-risk nurseries.

5- Diseases transmitted parentrally or through unscreened blood transfusion such as HIV, HBV, HCV, HDV, malaria and syphilis

Descriptive Epidemiology. I – Person II – Place III - Time

I - Person 1- Age: Newborn babies and elderly are

at a higher risk of HAIs. 2- Malnourished patients are more likely

to acquire nosocomial infections. 3-Comorbidities:chronic debilitating

diseases and severity of underlying diseases.

Cont. 4-Use of invasive procedures , potent

immunosuppressive, chemotherapeutic agents. These drugs affect the host’s normal colonizing flora, cause skin and mucous membrane breakdown and impair the function of the immune system.

5- Prolonged hospitalization. 6- Other personal characteristics :

marital status, sex & socioeconomic status may reflect the type of hospital attended and the level of health care provided.

II - Place The frequency of HAIs differs between

hospitals and even between different units within the same hospital. This difference is attributed to

- The level of infection control program. - The nature of the procedure carried. - The characteristic and the type of

patients attended.

Cont. Examples: The frequency of HAIs is

higher in the secondary health care facilities than that in the primary health care ones.

The frequency of the HAIs is greater in intensive care units (ICU) burn units, urology units than that in the other units.

III - Time

Outbreaks of HAIs may occur particularly those related to parenteral injection and surgery if medical staffs are not adequately trained.

Sources of infection I – Patients. II – Staff. III – Environment.

I - Patients Viral infections e.g measles, influenza. Skin infections e.g. discharging wounds. Respiratory infections e.g pneumonia. Urinary tract infection e.g B coli infection.

II - Staff Doctors, nurses, ward boys who come in

close contact with patients. Staph aureus carried in nose or skin. Hemolytic strept carried in the throat. Salmonella carried in GIT.

III - Environment Hospital environment (through hospital

dust, linen, bed clothes, furniture, basins, door handles) is laden with microorganisms forming an important source of infection.

Routes of infection Direct contact from hands of a nurse or

doctor to a susceptible patient. Droplet infection through cough or

sneezing. Air-borne infection e.g TB Release of hospital dust into the air. Various hospital procedures e.g IV,

catheters, infected cat gut, dressings, bed pans, sputum cups.

Recipients All patients in hospitals are potential

recipients. Some are more susceptible than others. NCIs are more in ICU, urological,

geriatric wards and special baby care units.

Components of effective health care associated Infections control Program.

I- Surveillance. II-Control Measures. III-Available qualified well trained personnel: A- Infection Control Practitioner. b- Hospital Epidemiologist.

I-Surveillance It should be conducted prospectively before

patients are discharged. Data collected during surveillance of HAIs are: 1- Infection rates by site, pathogen, specialty

service and patient care area, surgeon-specific wound infection rates, and procedure-specific rates should be calculated monthly and reported to hospital staff.

Cont. 2-Data related to the practices provided

to the patients to ensure the implementation of infection control measures (Such as aseptic technique during invasive procedures)

3- Data related to environmental practices that control the microbiological agents such as sterilization and disinfection procedures.

II-Control Measures 1- Isolation: infectious patients must be

isolated. Patients susceptible to infection should not be placed near source of infection.

2- Hospital staff suffering from skin diseases, sore throat, common cold, ear infection, diarrhea, dysentery should be kept away from work until complete cure.

Cont. 3-Hand hygiene: Wash hand after

touching blood, secretions, excretions and contaminated articles and after removing gloves. Use plain soap for routine hand washing and antimicrobial agent for specific circumstances.

4-Personal protective equipment (PPE).These include gloves, splash shields and eye protection and are used whenever there is a risk of exposure to blood or other infective material.

Cont. 5-Aseptic techniques: Surgical scrub and

gloving, sterile field and using good surgical technique.

6-Reprocessing of used instruments and sterile devices: Ensure that reusable equipment is not used for the care of another patient until it has been cleaned and reprocessed properly.

Cont. 7- Environmental cleaning: Cleaning and

disinfection of environmental surfaces should be routinely done.

8- Proper sharps and waste disposal: Take care to prevent injuries when using needles, scalpels and other sharp instruments and devices.

III-Available qualified well trained personnel

A-Infection control practitioner: At least one full-time infection control

practitioner (ICP) for every 250 hospital beds is required. The main duties of ICP are:

-Collecting and analyzing surveillance data. -Assisting in development of IC

procedures. -Education and consultation to other staff.

B-Hospital epidemiologist: -Supervises the IC practitioners. -Provides liaison with other members of

medical staff. -Provides advice about surveillance. -Conducting epidemiologic studies

required investigating outbreaks of HAI. -Development of infection control

measures.

Routine precautions Health workers are at risk of acquiring

infection through occupational exposure. Employee’s health should be reviewed at

recruitment: immunization, previous exposure, serological tests: AIDS, hepatitis A-B-C, TB.

Thank you