Cough Expectoration Zhengcuixia
Cough & Expectoration Zhengcuixia
Concept a protective reflex that can be controlled consciously Remove excessive secretion foreign material from the airway Initiated by miscellaneous stimuli or by voluntary exertion The most common respiratory symptom
Concept • A protective reflex that can be controlled consciously • Remove excessive secretion & foreign material from the airway • Initiated by miscellaneous stimuli or by voluntary exertion. • The most common respiratory symptom
Cough reflex Irritant type: mechanical, chemical inflammation Afferent inform from: larynx, trachea bifurcation of the bronchi Afferent fibers are in the vague nerve cough center
Cough reflex: •Irritant type: mechanical, chemical, inflammation •Afferent inform.from: larynx, trachea, bifurcation of the bronchi. •Afferent fibers are in the vague nerve cough center
Cough reflex Efferent signals larynx muscles of diaphragm, chest wall, abdomen A coordinated series of movement complete the cough. Deep inspiration -expiration effort with glottis closed-glottis open abruptly- high velocity of airflow brings out secretions from airways
Cough reflex • Efferent signals larynx muscles of diaphragm,chest wall, abdomen • A coordinated series of movement complete the cough. Deep inspiration – expiration effort with glottis closed- glottis open abruptly – high velocity of airflow brings out secretions from airways
Influencing factors depressed afferent or efferent nerve function Failed glottis function Diminished muscle force Obstructed airway seen in severe COPD Trachea intubation Chest or abdominal pain limit cough movement
Influencing factors • depressed afferent or efferent nerve function • Failed glottis function • Diminished muscle force • Obstructed airway seen in severe COPD • Trachea intubation • Chest or abdominal pain limit cough movement