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Cough: Defense Mechanism and Symptom. Karen A. Fagan, MD Associate Professor of Medicine Chief of Pulmonary and Critical Care Medicine John and Alice Chair of Pulmonary Medicine University of South Alabama. Disclosure. No financial relationships relevant to this presentation or content

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cough defense mechanism and symptom

Cough:Defense Mechanism and Symptom

Karen A. Fagan, MD

Associate Professor of Medicine

Chief of Pulmonary and Critical Care Medicine

John and Alice Chair of Pulmonary Medicine

University of South Alabama

disclosure
Disclosure
  • No financial relationships relevant to this presentation or content
  • Any off label use of medications will be identified during the lecture
objectives
Objectives
  • Understand the function and physiological mechanisms of cough.
  • Classify cough according to its duration.
  • Know the most common causes of acute cough in adults.
  • Know the symptoms, signs, and empiric treatment for the 4 most common causes of chronic cough in adults.
case study d b
Case Study- D.B.

47 y/o Caucasian woman, accountant, c/o cough for 3 years. 30 pack-year smoking history, quit in 2001. Traveled to China to adopt baby girl in 2002, caught “bad chest cold”. Recovered, but had “bronchitis” (phlegm, cough) ≥ 8 times/year thereafter. Episodes of “bronchitis” start suddenly, with a sore throat. Antibiotics and prednisone reduce symptoms, but incompletely. Coughs day and night. Told “you’re just getting a lot of colds from your daughter”. Frustrated. Worried about “weird infection.” Demoted at work because of days missed due to illness.

case study d b5
Case Study- D.B.
  • Review of Systems:

+ Mildly hoarse

+ Several sinus infections since 2002

- Heartburn, regurgitation

- Cardiac disease

- Neuromuscular disease

  • Physical Exam:

Normal vital signs

Looks depressed

Otherwise, normal

cough is 1
Cough is #1
  • The #1 chief complaint in primary care physicians’ offices is cough
  • Most-- but not all-- cough seen by PCP’s is acute cough related to viral upper and lower respiratory tract infections
  • Chronic cough is one of the most common reasons for consultation with a pulmonologist
  • Health care costs for cough exceed several billion dollars annually
cough what s it good for
Cough: What’s it good for?
  • Attract attention
  • Signal displeasure
  • Protect the airway from pathogens, particulates, food, other foreign bodies
  • Clear the airways of accumulated secretions, particles
cough reflex afferent pathway
Cough Reflex: Afferent Pathway
  • Vagus nerve is major afferent pathway
  • Stimuli arise from:
    • Ear
    • Pharynx
    • Larynx
    • Lungs
    • Tracheobronchial tree
    • Heart
    • Pericardium
    • Esophagus
cough reflex afferent pathway11
Cough Reflex: Afferent Pathway

Mechanical stimuli:

  • Rapidly adapting receptors (RARs)
  • Slowly adapting stretch receptors (SARs)
  • Chemical stimuli:
    • C-fibers
efferent pathway 4 phases
Efferent Pathway: 4 Phases

1. Inspiratory Phase

2. Compressive Phase

3. Expiratory Phase

4. Relaxation Phase

impaired cough who s at risk
Impaired Cough: Who’s at risk?
  • Interruption of afferent and/or efferent pathways of cough reflex impairs cough
  • Altered sensorium- anesthesia, narcotics, sedatives, alcohol, coma, stroke, seizure, SLEEP
  • Laryngeal/ upper airway disorders
  • Tracheostomy tube
  • Restrictive and obstructive lung diseases
  • Neuromuscular diseases
  • Supine in hospital bed
impaired cough consequences
Impaired Cough: Consequences
  • Aspiration of oropharyngeal or stomach contents (bacteria, food, other)
  • Acute airway obstruction
  • Pneumonia
  • Lung abscess
  • Respiratory failure/ ARDS
  • Bronchiectasis
  • Pulmonary fibrosis
complications of cough16
Complications of Cough
  • Result primarily from marked increase in intrathoracic pressure (> 300 mmHg) during cough
  • Affect nearly every other organ system
  • See Table 1 (handout) for PARTIAL list
  • Disruption of surgical wounds
  • Negative impact on quality of life, particularly in chronic cough
complications of cough17
Complications of Cough
  • Scares away big game!

“The Silencer is a real hunt saver for:

Spontaneous morning coughs

Cold

Flu and Allergy sufferers

Asthma suffers

Those on high blood pressure

medications

Excellent for Smoker's cough”

www.biggameproshop.com

american college of physicians 2006 cough guidelines
American College of Physicians 2006 Cough Guidelines
  • Evidence-based
  • Includes guidelines for pediatric cough
  • Should be used in conjunction with “clinical judgment”
  • Divides cough in adults by duration: acute, subacute, chronic
acute cough in adults
Acute Cough in Adults

Cough lasting less than 3 weeks

Key questions:

1. Is it life-threatening?

2. Are antibiotics needed?

slide20

Acute Cough

History, Examination, Investigations

Life-threatening Dx

Non-life-threatening Dx

Infectious

Exacerbation of pre-existing condition

Environmental or Occupational

Pneumonia, severe exacerbation of asthma or COPD, PE, Heart Failure, other serious disease

URTI

LRTI

Asthma

Bronchiectasis

UACS

COPD

Figure 1: The acute cough algorithm for the management of patients aged ≥ 15

years with cough lasting < 3 weeks. For diagnosis and treatment recommendations

refer to the section indicated in the algorithm. PE = pulmonary embolism; Dx =

diagnosis; Rx = treatment. For other abbreviations, see handout.

acute cough life threatening
Acute Cough: Life-Threatening
  • Congestive heart failure
  • Pneumonia
  • Asthma Exac.
  • COPD Exac.
  • Pulmonary Embolism
  • Other
acute cough non life threatening
Acute Cough: Non-Life-Threatening
  • Upper respiratory tract infection (URTI or URI)-- “The Common Cold”
    • Caused by viruses, e.g. rhinoviruses
    • Nasal congestion, drainage
    • Post-nasal drainage irritates larynx
    • Inflammatory mediators increase sensitivity of sensory afferents
    • Antibiotics are NOT indicated
    • Decongestants, cough suppressants of questionable value
acute cough non life threatening23
Acute Cough: Non-Life-Threatening
  • Lower respiratory tract infection-- “Acute Bronchitis”
    • Cough, with or without phlegm
    • Most bronchitis in otherwise healthy adults is caused by viruses (rhinovirus, adenovirus, RSV)
    • If it’s likely viral in origin, do not prescribe antibiotics
    • Bacterial causes to consider:
      • Mycoplasma pneumoniae, chlamydophila pneumoniae
      • Bordetella pertussis (whooping cough)
    • Make sure it’s not pneumonia
acute cough non life threatening24
Acute Cough: Non-Life-Threatening
  • Exacerbation of pre-existing condition
    • COPD: always consider bacterial infection
    • Asthma: try to identify the underlying cause (exposure, viral URTI, viral LRTI, other)
    • Bronchiectasis: always consider bacterial infection (gram negative rods, staph. aureus, organisms resistant to antibiotics)
    • Upper airway cough syndrome (UACS)
  • Environmental or occupational exposure: allergens, irritants
subacute cough in adults
Subacute Cough in Adults

Key questions:

1. Is it post-infectious?

2. If post-infectious, are antibiotics needed?

Cough lasting 3-8 weeks

slide26

Subacute Cough

History and Physical Exam

Post-infectious

Non-postinfectious

Workup same as chronic cough

Pneumonia and other serious diseases

New onset or exacerbation of pre-existing condition

Pertussis

UACS

Asthma

GERD

Bronchitis

Bronchitis

NAEB

AECB

Figure 2: Subacute cough algorithm for the management of patients aged ≥ 15 years

with cough lasting 3 to 8 weeks. For diagnosis and treatment recommendations refer

to section indicated in algorithm. AECB = acute exacerbation of chronic bronchitis.

For other abbreviations, please see syllabus.

chronic cough in adults
Chronic Cough in Adults
  • Cough lasting longer than 8 weeks
  • Top 4 in immunocompetent patient with normal CXR:
    • Upper airway cough syndrome
    • Asthma
    • Gastroesophageal reflux disease
    • Non-asthmatic eosinophilic bronchitis
  • Cough may have more than one cause-- a diagnostic challenge!
upper airway cough syndrome uacs
Upper Airway Cough Syndrome (UACS)
  • Also called “Post-nasal drip syndrome” (PNDS)
  • Mechanism: secretions from nose/sinuses stimulate upper airway cough receptors; inflammation increases receptor sensitivity
  • Classic symptoms: “tickle” in throat; throat clearing, hoarseness, nasal congestion
  • Cough may be the only symptom in ~ 20%
upper airway cough syndrome uacs31
Upper Airway Cough Syndrome (UACS)
  • Signs(may be absent): inflamed nasal mucosa, secretions in posterior oropharynx
  • Consider underlying causes: allergies, chronic sinusitis, overuse of alpha-agonist nasal sprays
  • Diagnostic/Therapeutic trial: 1st generation anti-histamine/decongestant combination medication for 2 weeks
asthma
Asthma
  • Mechanism: inflammatory mediators, mucus, bronchoconstriction stimulate cough receptors
  • Classic symptoms: intermittent wheeze
  • Cough may be the only symptom in 7-57% patients (depends on study)-- “Cough-variant asthma”
  • Signs (often absent): expiratory wheezing on chest exam
asthma33
Asthma
  • Diagnostic tests:
    • Spirometry, before and after bronchodilator: partially reversible airflow obstruction
    • Methacholine inhalation challenge: positive
  • Diagnostic/
  • Therapeutic trial: inhaled corticosteroid + bronchodilator for
  • ≥ 8 weeks
a vicious cycle
A Vicious Cycle

COUGH

REFLUX

INCREASED ABDOMINAL PRESSURE

gastroesophageal reflux disease gerd
Gastroesophageal Reflux Disease (GERD)
  • Classic symptoms: heartburn, sour taste in mouth
  • Cough may be only symptom in 75% patients with chronic cough
  • Diagnostic tests:
    • 24-hour esophageal pH probe (best)
    • Esophagram
gastroesophageal reflux disease gerd37
Gastroesophageal Reflux Disease (GERD)
  • Diagnostic/Therapeutic trial: gastric acid suppression with proton pump inhibitor (e.g. omeprazole) for ≥ 2 months, combined with diet and lifestyle modification
non asthmatic eosinophilic bronchitis naeb
Non-Asthmatic Eosinophilic Bronchitis (NAEB)
  • Eosinophilic airway inflammation WITHOUT variable airflow obstruction or airway hyperresponsiveness
  • Diagnostic tests:
    • Spirometry: normal
    • Methacholine challenge:
    • normal
    • Induced sputum: >3% eosinophils
  • Diagnostic/Therapeutic trial: inhaled corticosteroid for ≥ 4 weeks
slide39

Case Study: C.F

A 67 y/o man, life-long non-smoker, complains of 12 weeks of non-productive cough. He’s had a couple of “colds” this winter. He has no current nasal or sinus symptoms, rarely has heartburn, and never wheezes. He’s on no meds. Vitals and physical exam are normal. Your next step would be:

  • Prescribe a 1st generation antihistamine/decongestant
  • Prescribe an inhaled corticosteroid for asthma
  • Order an induced sputum to look for eosinophils
  • Order a chest x-ray
  • All of the above
ace inhibitor therapy
ACE-inhibitor therapy
  • Angiotensin converting enzyme (ACE) inhibitors (enalapril, captopril, lisinopril, ramipril, etc.)
  • Dry cough in 3-30% patients
  • Begins 1 week to 6 months after drug started
  • Usually resolves 1-7 days after stopping therapy, but can take 4 weeks
slide49

Bronchiectasis in patient with

Common Variable Immunoglobulin Deficiency

case study d b53
Case Study- D.B.

47 y/o Caucasian woman, accountant, c/o cough for 3 years. 30 pack-year smoking history, quit in 2001. Traveled to China to adopt baby girl in 2002, caught “bad chest cold”. Recovered, but had “bronchitis” (phlegm, cough) ≥ 8 times/year thereafter. Episodes of “bronchitis” start suddenly, with a sore throat. Antibiotics and prednisone reduce symptoms, but incompletely. Coughs day and night. Told “you’re just getting a lot of colds from your daughter”. Frustrated. Worried about “weird infection.” Demoted at work because of days missed due to illness.

case study d b54
Case Study- D.B.
  • Diagnostic Test Data:
    • PFTs: consistent with asthma
    • Methacholine challenge: positive
    • CXR / Chest CT: mild emphysema
    • Sinus CT: normal
    • pH probe: couldn’t place-- too much coughing
    • Esophagram: severe GERD
    • Laryngoscopy: interarytenoid erythema, c/w reflux
    • PPD: negative
case study d b55
Case Study- D.B.
  • Diagnosis: Chronic cough related to asthma, early COPD, GERD
  • Treatment: inhaled corticosteroid/bronchodilator, proton pump inhibitor
  • Outcome: at 2 months, cough significantly better, no urgent visits to PCP for cough, no need for corticosteroids or antibiotics