Voluntary cough

Camner P, Mossberg B, Philipson K, Strandberg K. 1979. Elimination of test particles from the human tracheobronchial tract by voluntary coughing . Scand. J. Resp. Dis. 60 56-62. 

Voluntary cough, under conscious control that is abolished with general anaesthesia. 

Simonyan K, Saad ZS et al (2007) Functional neuroanatomy of human voluntary cough and sniff production. Neuroimage 37 401 09... 

Simonyan K, Saad ZS, Loucks TM, Poletto CJ, Ludlow CL (2007) Eunctional neuroanatomy of human voluntary cough and sniff production. Neuroimage 37 401 09 Smith J, Owen E, Earis J, Woodcock A (2006) Effect of codeine on objective measurement of cough in chronic obstmctive pulmonary disease. J AUergy CUn Immunol 117 831-835 Smith MB, Eeldman W (1993) Over-the-counter cold medications. A critical review of clinical trials between 1950 and 1991. J Am Med Assoc 269 2258-2263... 

Smith Hammond CA, Goldstein LB, Zajac DJ, et al. Assessment of aspiration risk in stroke patients with quantification of voluntary cough. Neurology 2001 56 502-506. 

In normal conditions, secretion production is small and voluntary coughing is unproductive. However, when disease is present (such as in acute bronchitis), the molecular components change, production increases considerably, and sputum is formed from mucus, inflammatory cells, cell debris, and bacteria. Disruption of normal secretion or mucociliary clearance impairs pulmonary function and lung defense and increases risk of infection (14). However, it is not clear whether hypersecretion is only a marker of inflammation or a cause of pathological changes. There is even some evidence that stasis of mucus protects against inhaled material (15). 

Camner P. Studies on the removal of inhaled particles from the lungs by voluntary coughing. Chest 1981 80 824-827. 

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