autogenic drainage

AUTOGENIC AUTOGENIC DRAINAGEDRAINAGE

AUTOGENIC AUTOGENIC DRAINAGEDRAINAGE

• Autogenic drainage (Self Drainage) is a breathing technique that uses expiratory airflow to mobilize bronchial seretions, usually done in sitting position.

• It consists of 3 phases.

• 1.UNSTICKING PHASE:Breathing at low lung volume to

unstuck the peripheral secretions.• 2.COLLECTING PHASE:

Breathing at low to mid lung volume(tidal volume) to collect the mucus in the middle airways.

• 3. EVACUATING PHASE:Breathing at mid to high lung

volumes to evacuate the mucus from the central airways.

PHYSIOLOGY OF AD:(Explained eloquently by

SHONI-1989).

1.UNSTICKING PHASE:This phase starts with an

inspiration, followed by a breath hold (to ensure equal filling of lung segments by collateral filling) and then a deep exhalation in to the expiratory reserve volume range.

• By lowering mid tidal volume below functional residual capacity level, secretions from peripheral lung regions are mobilized by compression of peripheral alveolar ducts(mid expiratory tidal volume is lowered in the range of normal expiratory reserve volume)

2.COLLECTING PHASE:• It consists of tidal volume

breathing so that breathing is changed from expiratory residual volume in to the inspiratory residual volume range to mobilize the secretions from the apical parts of the lung.

3. EVACUATING PHASE:

• It consists of deeper inspiration in to the inspiratory reserve volume with huffing often used to help in evacuating the mobilized secretions.

• Control of airflow during this final phase is essential to avoid uncontrolled, unproductive coughing.

Equipments required for AD:

• Self technique• Patient and therapist possess good

proprioceptive, tactile and auditory perception of the mucus moving.

Preparation for Autogenic Drainage:

• Upright sitting with back support.• Physiotherapist should be seated

to the side and slightly behind the patient so that he can hear the patients breathing.