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ACUTE RESPIRATORY INFECTIONS
Dr Mallikarjuna DStudy PhysicianDepartment of Community MedicineKMC,Manipal
Learning Objectives• Introduction• Epidemiological determinants• Mode of Transmission• Clinical Assessment• Classification of Illness• Treatment• Prevention of Acute respiratory infections
INTRODUCTION• It causes inflammation of the respiratory tract anywhere
from nose to alveoli with combination of signs and symptoms
It is classified depending upon the site:• Acute Upper Respiratory Infections (AURI)• Acute Lower Respiratory Infections (ALRI)
Introduction…
• AURI includes common cold, pharyngitis and otitis media
• ALRI includes epiglottitis, laryngitis, laryngotracheitis, bronchitis, bronchiolitis and pneumonia.
Burden of ARI
ARI deaths attributable to Undernutrition
Importance
Epidemiological DeterminantsAGENT FACTORS:
The microbial agents that cause ARI are numerous and include bacteria and viruses
• Even within species they show wide diversity of antigenic type
• Severity of illness is determined by whether secondary bacterial infection occurs or not
Bacterial agentsAgent Age groups frequently
affectedCharacteristic clinical features
Bordetella pertusis Infant, young children Paroxysmal cough
Corynebacterium diphtheriae
children Nasal/tonsillar/pharyngeal membraneous exudate, severe toxemia
Streptococcus pneumoniae All ages specifically under 5 children
Lobar and multilobular pneumonia, acute exacerbations of chronic bronchitis
Streptococcus pyogenes All ages Acute pharyngitis and tonsillitis
Staphylococcus pyogenes All ages Lobar and bronchopneumonia, lung abscess
Haemophilus inflenzae children Acute epiglottitis (type B)
Klebsiella pneumoniae Adults Lobar pneumonia , lung abscess
Legionella pneumoniae Adults Pneumonia
Viral agentsAgent Age group frequently
affectedCharacteristic clinical features
Adenovirus endemic types(1,2,5)
Young children LRTI
Epidemic types(3,4,7) Older children , young adults
Pharyngitis , flu like illness
Influenza A, B,C All ages, school children Variable respiratory symptoms, occasional primary pneumonia
Parainfluenza 1,2,3 Young children and infants
Croup
Respiratory syncytial virus
Infants, young children Severe bronchilitis and pneumonia
Rhinovirus All ages Common cold
Corona virus All ages Common cold
Measles Young children Variable respiratory with rash
Host factors• Case fatality rates are higher in young infants and
malnourished children• In developing countries like India, malnutrition and low
birth weight is often a major problem, the rates are highest in those children
• The rates of pharyngitis and otitis media increase from infancy to peak at the age of 5 years
Risk factors• Climatic conditions• Housing• Level of industrialization• Socio economic development• Overcrowded dwellings• Poor nutrition• Low birth weight• Intense indoor smoke pollution
Mode of transmission
• Air borne route
• Chain of transmission is maintained by direct person-person contact
Clinical assessment• History to be elicited:• Age of the child• Since how long the child is coughing• Young infant stopped feeding well (less than 2 months)• The child is able to drink (2 months to 5 years)• H/O fever• Child is excessively drowsy/difficult to wake• Irregular breathing• Convulsions • The child turning blue
Physical examination
• Count the breaths in one minute
• Fast breathing depend upon the age of the child
• It should be seen for 1 full minute looking at the abdominal movement or lower chest when the child is calm
Fast Breathing
Age Fast breathing
Less than 2months 60 breaths /more
2months to 1 year 50 breaths/more
1 to 5 years 40 breaths/more
Look for chest indrawing• The child has chest indrawing if the lower chest wall goes in when the child breathes in
• It occurs when the effort required to breathe in is much greater than normal
Look and listen for stridor
• Stridor makes a harsh noise when the child breaths IN
• It occurs when there is narrowing of the larynx, trachea or epiglottis which interferes with air entering the lungs
• This condition is called croup
Look for wheeze• Wheezing is soft whistling noise when the child breathes
OUT• It is caused by narrowing of air passage in lung• Breathing out phase takes longer than normal and effort• Elicit H/O previous history of wheezing• If so, the child is classified as having recurrent wheeze
Other Signs
• See if the child is abnormally sleepy or difficult to wake
• Feel for fever or lower body temperature
• Cyanosis is a sign of hypoxia, must be checked in good light
Check for severe malnutrition• High risk factor• Case fatality rates are higher in these children• In a severely malnourished children with pneumonia, fast
breathing and chest indrawing may not be as evident • Impaired/absent response to hypoxia and a weak/absent
cough reflex
• These children need careful evaluation and management for pneumonia
Classification of illness
Child aged 2 months – 5 years:• Very severe disease• Severe pneumonia• Pneumonia• No pneumonia
Infants less than 2 months:• Very severe pneumonia• Severe pneumonia• No pneumonia
Child aged 2 months to 5 years
Very severe disease:
•Signs : not able to drink, convulsions, abnormally sleepy or difficult to wake, Stridor in calm child and Severe malnutrition
•Treatment:• Refer urgently to hospital• Give first dose of antibiotic• Treat fever, if present• Treat wheezing ,if present• If cerebral malaria is present, give an antimalarial
Severe pneumonia• Signs : chest indrawing, recurrent wheezing
Treatment:• Refer urgently to hospital• Give first dose of antibiotic• Treat fever, wheezing if present• If referral is not feasible treat with an antibiotic and follow
closely
Pneumonia• Signs : fast breathing and no chest indrawing
Treatment:• Advice mother to give home care• Give an antibiotic• Treat wheezing / fever if present• Advice mother to return with child after 2 days for
reassessment/ earlier if the child is getting worst
Reassessment Re-assess the child after 2 days
Worse same improving
Not able to drink Breathing slower,less Has chest indrawing fever, eating better danger signs
Refer URGENTLY to change antibiotic / refer finish 5 days of Hospital antibiotic
Infants less than 2 years
Very severe pneumonia:• Signs : stopped feeding well, convulsions, abnormally
sleepy, stridor, wheezing, fever or hypothermia
Treatment :• Refer URGENTLY to hospital• Keep young infant warm• Give first dose of an antibiotic
Severe pneumonia• Signs : severe chest indrawing or fast breathing (60
breaths per minute or more)
• Treatment :• Refer URGENTLY to hospital• Keep young infant warm• Give first dose of antibiotic• If referral is not feasible treat with an antibiotic and follow
closely
No pneumonia: cough or cold• Signs : no chest indrawing and no fast breathing
• Treatment :• Advice mother to give the following home care – keep
young infant warm, breast feed frequently, clear nose if it interferes with feeding
• Return if any danger signs- breathing becomes difficult/fast, not feeding, and infant becomes sicker
Treatment - Pneumonia
Age/weight Paediatric tabletSulfamethoxazole 100 mg, Trimethoprim 20 mg
Paediatric syrup5ml –sulfamethoxazole 200mg, trimethoprim 40 mg
<2 months/3-5 kg 1 tablet twice a day Half spoon (2.5 ml) twice a day
2- 12 months/6-9 kg 2 tablets twice a day One spoon (5ml) twice a day
1-5 years/10-19 kg 3 tablets twice a day One and half spoon (7.5ml) twice a day
Treatment of severe pneumoniaAntibiotics Dose Interval ModeA. First 48 hoursBenzyl penicillin OR
50000 IU/kg/dose 6 hourly IM
Ampicillin 50mg/kg/dose 6 hourly IMChloramphenicol 25mg/kg/dose 6 hourly IM
B. If condition IMPROVES
Then for the next 48 hours
Procaine penicillin 50,000 IU/kg once IM
Ampicillin 50mg/kg/dose 6 hourly oralChloramphenicol 25mg/kg/dose 6 hourly oral
Treatment of severe pneumonia…• If there is no improvement ,then for the next 48 hours
change antibiotic
• Provide symptomatic treatment for fever and wheezing
• Monitor fluid and food intake
• Advice mother on home management on discharge
Infants less than 2 monthsAntibiotic Dose Frequency in
age <7daysFrequency in age 7 days to 2 months
Inj.Benzyl penicillin
50000 IU/kg/dose 12 hourly 6 hourly
Inj.Ampicillin 50mg/kg/dose 12 hourly 8 hourly
Inj.Gentamycin 2.5mg/kg/dose 12 hourly 8 hourly
Management of AURI
• DO NOT require treatment with antibiotics
• Causative agents are viruses
• Increase resistant strains and cause side effects
• Symptomatic treatment and care at home
Prevention of ARI
Prevention of ARI• ARI control programme is the part of RCH programme• Improved living conditions• Better nutrition• Reduction of smoke pollution indoors• Better Maternal Child Health care• Immunization• Health promotional activities
Immunization
• Measles vaccine
• HIB vaccine
• Pneumococcal pneumonia vaccine
Pneumococcal Pneumonia vaccine
• PPV23:• It is a polysaccharide, non conjugate vaccine containing
capsular antigens of 23 serotypes, available for children above 2 years and adults
• Single IM / subcutaneous dose is given in deltoid muscle• It should never be mixed with other vaccines in the same
syringe, it can be given at the same time as separate injection in other arm
PCV• Two conjugate vaccines are available PCV10 and PCV 13• Storage temperature : 2-8degrees• It is given in infants as 3 primary doses/2 primary and 1
booster dose• Initiated as early as 6 weeks with an interval of 4-8 weeks• Doses at 6,10,14 weeks/2,4,6 months• One booster dose is given at 9-15 months
PCV…• HIV positive and preterm babies who have received 3
primary doses in 1 year, require booster dose in 2nd year• When primary immunization is initiated with one of
vaccines, it is recommended that remaining doses are administered with the same product
• WHO recommends inclusion of PCVs in UIP worldwide, particularly in countries with high under5 mortalities
Thank you