osce learning points
It is loud, hollow, and high pitch
Expiratory phase is longer than inspiratory phase
There is distinct pause between inspiration and expiration due to absent alveolar phase
Vesicular breathsounds
Soft, low pitched, and rustling in quality
a) Inspiratory phase remains longer than the expiratory phase
b) Inspiration is higher pitch than expiration
c) No pause between inspiration and expiration
What are crepitations? How they occur ?
Crepitations are adventitious breath sounds.
Crepitations are made either by air passages and alveoli (air sacs) opening up during inspiration or by air bubbling through fluid. They are not normally heard in healthy lungs.
During expiration alveoli stick together while during inspiration the alveolar walls are seperated with difficulty and only at the end of inspiration
Crepitations is silight crackling sound that can be imitated by rubbing a strand of hair.
Ventilator weaning criteria
Subjective assesment
Adequate cough
No neuromuscular blocking agents
Absence of extra tracheobronchial secretions
Reversal of underlying cause for respiratory failure
No continous sedative infusion
Objective measurments
Stable cardiovascular status
Heart rate <140 beat/min
No active myocardial ischemia
Adequate hemoglobin level >8g/dl
Systolic blood pressure 90-160mmHg
Afebrile
Adequate oxygenation
Tidal volume >5ml/kg
Vital capacity >10ml/kg
Proper inspiratory effort
Respiratory rate <35/min.
Pao2 >60 and paCo2<60mmHg
No significant respiratory acidosis pH>7.30
O2 saturation >90%on FIO2<0.4
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