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== | ==Cough== | ||
Editor-In-Chief: [[C. Michael Gibson, M.S., M.D.]]; Associate Editor(s)-in-Chief:[[Abiodun Akanmode]] | Editor-In-Chief: [[C. Michael Gibson, M.S., M.D.]]; Associate Editor(s)-in-Chief:[[Abiodun Akanmode]] | ||
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[[Cough]] is a physiologic [[reflex]] action, it serves to rid the [[respiratory tract]] of excessive secretions and other environmental debris such as dust, pollen, and other irritants. | [[Cough]] is a physiologic [[reflex]] action, it serves to rid the [[respiratory tract]] of excessive secretions and other environmental debris such as dust, pollen, and other irritants. | ||
Coughing also referred to as [['tussis']] is associated with the rapid release of air from the lung this is associated with the loud and distinctive sound associated with coughing. [[Cough]] is the most common cause of visits to [[primary care]] doctors and pulmonologist.[[Cough]] is mostly a symptom of an underlying disease, however, establishing the exact cause of [[cough]] can be challenging. | Coughing also referred to as [['tussis']] is associated with the rapid release of air from the lung this is associated with the loud and distinctive sound associated with coughing. [[Cough]] is the most common cause of visits to [[primary care]] doctors and pulmonologist, it accounts for about 40% of outpatient visits.[[Cough]] is mostly a symptom of an underlying disease, however, establishing the exact cause of [[cough]] can be challenging. | ||
While most [[cough]] is ussaully acute due to [[postnasal drip]],[[bronchial asthma]] and [[heartburn]] other more serious causes such as [[chronic obstructive pulmonary disease|COPD]],[[lung cancer]] should be considered when a [[chronic cough]] is suspected. | While most [[cough]] is ussaully acute due to [[postnasal drip]],[[bronchial asthma]] and [[heartburn]] other more serious causes such as [[chronic obstructive pulmonary disease|COPD]],[[lung cancer]] should be considered when a [[chronic cough]] is suspected. | ||
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*Non-productive cough. | *Non-productive cough. | ||
*Productive cough. | *Productive cough. | ||
==Pathophysiology == | |||
The act of cough is a vital one that occurs through the stimulation of the [[cough]] [[reflex]] which is a complex [[relex]] arc. The cough reflex arc is constituted by 3 main components ie | |||
*The Afferent pathway: This made up of [[sensory nerve]] [[fibers]] in the [[ciliated epithelium]] found in the upper airways. The afferent impulses are transmitted into the medulla. | |||
*The efferent pathway: cough impulse3s that is originated from the cough central travels via the [[vagus nerve]],[[phrenic nerve]] and spinal motor nerves to the [[diaphragm]] and abdominal wall muscles. | |||
*Central pathway: This is a central area located within the [[pons]] and [[brainstem]]. It coordinates the cough [[reflex]] arc. | |||
The Afferent sensory nerves:There are 3 manjor classes of afferent [[sensory nerves]],this classification is based on there [[conduction]] velocity(A-fiber, > 3 m/s; C-fiber, < 2 m/s),origin ,myelination,neurochemistry etc.<ref name="pmid22958367">{{cite journal| author=Polverino M, Polverino F, Fasolino M, Andò F, Alfieri A, De Blasio F| title=Anatomy and neuro-pathophysiology of the cough reflex arc. | journal=Multidiscip Respir Med | year= 2012 | volume= 7 | issue= 1 | pages= 5 | pmid=22958367 | doi=10.1186/2049-6958-7-5 | pmc=3415124 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=22958367 }} </ref> | |||
*Rapidly adapting [[receptors]] (RARs) | |||
*Slowly adapting stretch receptors (SARs) | |||
*C-fibres. | |||
The series of mechanical activities that take place during coughing is divided into 3 phases.<ref name="pmid16428691">{{cite journal| author=McCool FD| title=Global physiology and pathophysiology of cough: ACCP evidence-based clinical practice guidelines. | journal=Chest | year= 2006 | volume= 129 | issue= 1 Suppl | pages= 48S-53S | pmid=16428691 | doi=10.1378/chest.129.1_suppl.48S | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=16428691 }} </ref> | |||
*The [[inspiratory]] phase: Here there in [[inhalation]] of an appropriate amount of air needed to produce [[cough]]. | |||
*The [[Compression]] Phase: The contraction of the muscles of the chest wall, [[abdominal wall]], and the [[diaphragm]] against a closed [[larynx]] brings about a rapid increase in [[intrathoracic pressure]]. | |||
*The [[Expiratory]] Phase: At this last phase the glottis is open bringing about a large [[expiratory]] airflow and the unique sound associated with coughing. | |||
==Causes== | |||
The common causes of cough are: | |||
*[[Bronchial asthma]]. | |||
*[[GERD]]. | |||
*[[Postnasal drip]]. | |||
*[[Post viral cough]]. | |||
*[[Allergic rhinitis]]. | |||
Less common causes of cough are: | |||
*'''Drug use''' eg: Abacavir, Abatacept, ABVD, ACE inhibitor, Acetylmorphone, Acyclovir, Adalimumab, Adefovir, Albuterol, Alefacept, Alfuzosin, Aliskiren, Amiodarone, Amlodipine and Benazepril, Amphotericin B, Anagrelide, Anastrozole, Artemether/lumefantrine, Atazanavir, Aztreonam, Benazepril, Bepridil, Bevacizumab, Bitolterol, Bortezomib, Brimonidine, Budesonide, Busulfan, Captopril, Carvedilol, Cetuximab, Cevimeline, Chlorambucil, Ciclesonide, Cladribine, Clobutinol, Clofarabine, Clofedanol, Co-trimoxazole, Conjugated estrogens, crofelemer, Cromolyn Sodium, Cytarabine, Dacarbazine, Dactinomycin, Darbepoetin Alfa, Denileukin diftitox, Desmopressin, Diborane, | |||
* '''Infectious diseases''' eg.Adenoviridae, Aphthovirus, Ascaris infection, Aspergillosis, Blastomycosis, Bordetella pertussis, Byssinosis, Chickenpox, Chlamydophila pneumonia, Cladosporium, CMV Pneumonitis, Coccidioidomycosis, Community-acquired pneumonia, Cryptococcosis, Fasciolosis, Filariasis, Gnathostomiasis, Histoplasmosis, Human ehrlichiosis, Infectious mononucleosis, Influenza, Lady Windermere syndrome, Lassa fever, Legionellosis, Measles, Melioidosis, Miliary tuberculosis, Mucor. | |||
*'''Genetic diseases''': Cystic fibrosis, Juvenile Myelomonocytic Leukemia (JMML) | |||
*'''Environmental agents''' eg: Chronic beryllium disease (CBD), Hay fever, Low humidity, Occupational exposure of irritants Passive smoking, Sick building syndrome, Silicosis, Smoking. | |||
*'''Malignancies''': Cervical mass, Esophageal cancer, Kaposi's sarcoma, Laryngeal cancer, Lymphangitis carcinomatous, Mediastinal tumor, Mesothelioma, Papillomatosis, Thymoma. | |||
==Refrences== | ==Refrences== | ||
Revision as of 15:24, 16 August 2020
Cough
Editor-In-Chief: C. Michael Gibson, M.S., M.D.; Associate Editor(s)-in-Chief:Abiodun Akanmode
Overview
Cough is a physiologic reflex action, it serves to rid the respiratory tract of excessive secretions and other environmental debris such as dust, pollen, and other irritants.
Coughing also referred to as 'tussis' is associated with the rapid release of air from the lung this is associated with the loud and distinctive sound associated with coughing. Cough is the most common cause of visits to primary care doctors and pulmonologist, it accounts for about 40% of outpatient visits.Cough is mostly a symptom of an underlying disease, however, establishing the exact cause of cough can be challenging. While most cough is ussaully acute due to postnasal drip,bronchial asthma and heartburn other more serious causes such as COPD,lung cancer should be considered when a chronic cough is suspected.
Classification
Cough can be classified based on duration i.e[1]
- Acute cough: This type of cough usually presents with a duration of fewer than 3 weeks.
- Sub Acute cough: Last between 3-8weeks.
- Chronic Cough: Chronic cough usually presents for a duration greater than 8weeks.
Cough can also be classified based on sputum production i.e
- Non-productive cough.
- Productive cough.
Pathophysiology
The act of cough is a vital one that occurs through the stimulation of the cough reflex which is a complex relex arc. The cough reflex arc is constituted by 3 main components ie
- The Afferent pathway: This made up of sensory nerve fibers in the ciliated epithelium found in the upper airways. The afferent impulses are transmitted into the medulla.
- The efferent pathway: cough impulse3s that is originated from the cough central travels via the vagus nerve,phrenic nerve and spinal motor nerves to the diaphragm and abdominal wall muscles.
- Central pathway: This is a central area located within the pons and brainstem. It coordinates the cough reflex arc.
The Afferent sensory nerves:There are 3 manjor classes of afferent sensory nerves,this classification is based on there conduction velocity(A-fiber, > 3 m/s; C-fiber, < 2 m/s),origin ,myelination,neurochemistry etc.[2]
- Rapidly adapting receptors (RARs)
- Slowly adapting stretch receptors (SARs)
- C-fibres.
The series of mechanical activities that take place during coughing is divided into 3 phases.[3]
- The inspiratory phase: Here there in inhalation of an appropriate amount of air needed to produce cough.
- The Compression Phase: The contraction of the muscles of the chest wall, abdominal wall, and the diaphragm against a closed larynx brings about a rapid increase in intrathoracic pressure.
- The Expiratory Phase: At this last phase the glottis is open bringing about a large expiratory airflow and the unique sound associated with coughing.
Causes
The common causes of cough are:
Less common causes of cough are:
- Drug use eg: Abacavir, Abatacept, ABVD, ACE inhibitor, Acetylmorphone, Acyclovir, Adalimumab, Adefovir, Albuterol, Alefacept, Alfuzosin, Aliskiren, Amiodarone, Amlodipine and Benazepril, Amphotericin B, Anagrelide, Anastrozole, Artemether/lumefantrine, Atazanavir, Aztreonam, Benazepril, Bepridil, Bevacizumab, Bitolterol, Bortezomib, Brimonidine, Budesonide, Busulfan, Captopril, Carvedilol, Cetuximab, Cevimeline, Chlorambucil, Ciclesonide, Cladribine, Clobutinol, Clofarabine, Clofedanol, Co-trimoxazole, Conjugated estrogens, crofelemer, Cromolyn Sodium, Cytarabine, Dacarbazine, Dactinomycin, Darbepoetin Alfa, Denileukin diftitox, Desmopressin, Diborane,
- Infectious diseases eg.Adenoviridae, Aphthovirus, Ascaris infection, Aspergillosis, Blastomycosis, Bordetella pertussis, Byssinosis, Chickenpox, Chlamydophila pneumonia, Cladosporium, CMV Pneumonitis, Coccidioidomycosis, Community-acquired pneumonia, Cryptococcosis, Fasciolosis, Filariasis, Gnathostomiasis, Histoplasmosis, Human ehrlichiosis, Infectious mononucleosis, Influenza, Lady Windermere syndrome, Lassa fever, Legionellosis, Measles, Melioidosis, Miliary tuberculosis, Mucor.
- Genetic diseases: Cystic fibrosis, Juvenile Myelomonocytic Leukemia (JMML)
- Environmental agents eg: Chronic beryllium disease (CBD), Hay fever, Low humidity, Occupational exposure of irritants Passive smoking, Sick building syndrome, Silicosis, Smoking.
- Malignancies: Cervical mass, Esophageal cancer, Kaposi's sarcoma, Laryngeal cancer, Lymphangitis carcinomatous, Mediastinal tumor, Mesothelioma, Papillomatosis, Thymoma.
Refrences
- ↑ De Blasio F, Virchow JC, Polverino M, Zanasi A, Behrakis PK, Kilinç G; et al. (2011). "Cough management: a practical approach". Cough. 7 (1): 7. doi:10.1186/1745-9974-7-7. PMC 3205006. PMID 21985340.
- ↑ Polverino M, Polverino F, Fasolino M, Andò F, Alfieri A, De Blasio F (2012). "Anatomy and neuro-pathophysiology of the cough reflex arc". Multidiscip Respir Med. 7 (1): 5. doi:10.1186/2049-6958-7-5. PMC 3415124. PMID 22958367.
- ↑ McCool FD (2006). "Global physiology and pathophysiology of cough: ACCP evidence-based clinical practice guidelines". Chest. 129 (1 Suppl): 48S–53S. doi:10.1378/chest.129.1_suppl.48S. PMID 16428691.