IMNCI Pneumonia Classification

IMNCI (Integrated Management of Neonatal and Childhood Illness) is the Indian adaptation of the WHO's IMCI strategy. It includes the first 7 days of life in addition to childhood illness management. Pneumonia classification under IMNCI is based entirely on clinical signs - no X-ray or investigations required.

Age Group 1: Children 2 months to 5 years

The classification is based on two key signs: respiratory rate (fast breathing) and chest indrawing.

Fast Breathing Thresholds

Age	Fast Breathing Threshold
2 months up to 12 months	≥ 50 breaths/minute
12 months up to 5 years	≥ 40 breaths/minute

Classification Table (2 months - 5 years)

Signs	Classification	Treatment
Not able to drink OR Convulsions OR Abnormally sleepy/difficult to wake OR Stridor in calm child OR Severe malnutrition	VERY SEVERE DISEASE	Refer URGENTLY to hospital; first dose antibiotic; treat fever/wheezing; antimalarial if cerebral malaria possible
Chest indrawing (± fast breathing)	SEVERE PNEUMONIA	Refer URGENTLY to hospital; first dose antibiotic; treat fever/wheezing (if referral not feasible: treat with antibiotic + follow closely)
Fast breathing (no chest indrawing)	PNEUMONIA (not severe)	Home care; oral antibiotic; treat fever/wheezing; reassess in 2 days or earlier if worse
No chest indrawing AND no fast breathing	NO PNEUMONIA: Cough or Cold	Home care; no antibiotic; if cough >30 days, refer for TB/asthma/pertussis assessment

Key note: A child with chest indrawing + recurrent wheezing - go directly to treat wheezing (likely asthma, not severe pneumonia). Chest indrawing + first episode wheezing = classify as severe pneumonia.

Age Group 2: Young Infants (1 week up to 2 months)

Young infants are a special group - they can deteriorate rapidly, may not cough with pneumonia, and often show only non-specific signs.

Fast Breathing Threshold for Young Infants

≥ 60 breaths/minute = fast breathing

Classification Table (Young Infants < 2 months)

Signs	Classification	Treatment
Stopped feeding well, Convulsions, Abnormally sleepy/difficult to wake, Stridor in calm child, Wheezing, Fever (≥38°C) OR low body temperature	VERY SEVERE DISEASE	Refer URGENTLY; keep warm; first dose antibiotic
Severe chest indrawing OR Fast breathing (≥60/min)	SEVERE PNEUMONIA	Refer URGENTLY; keep warm; first dose antibiotic (if referral not feasible: treat + follow closely)
No severe chest indrawing AND no fast breathing (<60/min)	NO PNEUMONIA: Cough or Cold	Home care: keep warm, frequent breastfeeding, clear nose; return urgently if breathing worsens, feeding fails, or infant becomes sicker

Note for young infants: There is no "pneumonia (not severe)" category - it jumps directly from No Pneumonia to Severe Pneumonia. This is because any fast breathing or chest indrawing in a young infant is treated as severe.

Summary: Key Distinguishing Features

Feature	2 months - 5 years	< 2 months
Fast breathing cut-off	50/min (2-12 mo) or 40/min (1-5 yr)	60/min
"Pneumonia (not severe)" category	Yes	No
Chest indrawing alone	Severe pneumonia	Severe pneumonia
Fever	General danger sign	Sign of very severe disease
Wheezing	Assess recurrent vs first episode	Sign of very severe disease

Treatment Antibiotics (Standard, India)

Pneumonia (not severe), 2 mo - 5 yr: Oral cotrimoxazole (drug of choice); efficacy equivalent to ampicillin/penicillin with cure rates up to 95%
Severe pneumonia (any age): Refer + first-dose injectable antibiotic

Source: Park's Textbook of Preventive and Social Medicine, Chapter on ARI/IMNCI (Tables 2, 3, and 4)

Bronchial vs vesicular breath sounds

Finding Sources

Reading File

Finding Sources

Reading File

Finding Sources

Reading File

Finding Sources

I now have excellent, detailed content from Murray & Nadel's Respiratory Medicine and Harrison's. Here is the full comparison:

Bronchial vs Vesicular Breath Sounds

Important Terminology Note

The term "vesicular" is technically a misnomer - normal breath sounds were once assumed to arise from air entering the alveoli (vesicles), but we now know alveolar filling is a silent, diffusion-based process. The correct modern term is simply "normal breath sounds." However, "vesicular" remains in widespread clinical use and exam syllabi, so both terms are used below.

Side-by-Side Comparison

Feature	Vesicular (Normal) Breath Sounds	Bronchial Breath Sounds
Also called	Normal breath sounds	Tubular breath sounds
Origin	Turbulent airflow in lobar/segmental bronchi (inspiratory) and larger airways (expiratory)	Trachea and large central airways - transmitted peripherally through consolidated lung
Normal location	Entire lung periphery	Trachea, manubrium, over major bronchi only
Abnormal if heard	Absent/decreased = pathological	In the lung periphery = consolidation
Inspiration	Louder, longer	Loud, high-pitched, tubular
Expiration	Softer, shorter (often barely audible)	Equally loud or LOUDER than inspiration
I:E ratio	~3:1 (inspiration longer and louder)	~1:1 or 1:2 (expiration equal or dominant)
Gap between I and E	Continuous, no gap	Clear gap (silent interval) between I and E phases
Pitch/quality	Soft, rustling, low-pitched	High-pitched, hollow, "blowing" or tubular
Intensity	Moderate	Loud

Why Do Bronchial Sounds Appear Over Consolidation?

Normally, the large volume of air-filled alveoli dampens central airway sounds before they reach the chest wall. When lung parenchyma is consolidated (filled with fluid, pus, or blood), it:

Becomes a solid medium that transmits sound more efficiently than air
Removes the normal dampening effect of air-filled alveoli
Allows large-airway (tracheal/bronchial) sounds to transmit directly to the chest wall

This is why bronchial breath sounds at the periphery are a classic sign of consolidation - and importantly, their presence implies the airway to that region is patent (not obstructed).

Causes of Bronchial Breath Sounds in the Periphery

Cause	Mechanism
Lobar pneumonia	Alveolar consolidation with fluid/pus
Pulmonary edema	Alveolar flooding
Pulmonary hemorrhage	Alveolar filling with blood
Lung abscess (if patent airway)	Surrounding consolidation
Large pleural effusion (at upper edge)	Compression atelectasis of lung above effusion

Causes of Decreased/Absent Vesicular Sounds

Any sound barrier between central airways and chest wall attenuates normal transmission:

Cause	Mechanism
Pleural effusion	Fluid barrier
Pneumothorax	Air barrier
Emphysema	Hyperinflation + parenchymal destruction
Peripheral bulla	Air-filled space intercepts sound
Obstructing mass	Distal airway blocked, no airflow
Obesity/thick chest wall	Physical attenuation

Associated Auscultatory Signs (With Bronchial Breathing)

When bronchial breath sounds are present, the same consolidation that transmits them also produces:

Egophony - patient says "EEE," examiner hears "AYY" (bleating quality); sign of consolidation/pneumonia, absent in interstitial fibrosis
Bronchophony - spoken voice heard clearly and loudly through stethoscope
Whispered pectoriloquy - whispered words transmitted clearly (normally whispers are indistinct)
Increased tactile fremitus - palpable vibration increased over consolidation (vs. decreased over effusion)
Dullness to percussion - over consolidated or fluid-filled areas

Memory Aid

"Bronchial = Blowing, Both phases loud, Brief gap between them" "Vesicular = Very soft expiration, Variable with ventilation"

Sources: Murray & Nadel's Textbook of Respiratory Medicine (Table 18.3 and Normal Lung Sounds section); Harrison's Principles of Internal Medicine 22E (Physical Examination of the Chest)

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