Textbook of Urgent Care Medicine, Chapter 19, Acute Exacerbations of Chronic Bronchitis

Published on October 26, 2026

Original author: Rasai L. Ernst

Originally published in 2014. Substantially updated and clinically reviewed in 2026 to reflect current evidence, guidelines, and urgent care practice.

INTRODUCTION

Acute exacerbation of chronic bronchitis is a common reason for visiting an urgent care center, especially in patients who use tobacco.

Current COPD guidance generally uses the term exacerbation of chronic obstructive pulmonary disease (ECOPD) rather than acute exacerbation of chronic bronchitis. An ECOPD is an acute worsening of dyspnea and/or cough and sputum over several days, usually no longer than 14 days, and may be associated with infection, pollution, or another insult to the lungs.

PRESENTATION

• Shortness of breath
• Cough
• Wheezing
• Changes in characteristics of sputum
• Tachypnea
• Cyanosis
• Symptoms that are worse than the patient’s usual baseline
• Increased sputum volume or purulence
• Fatigue, reduced exercise tolerance, or difficulty speaking because of dyspnea

TRIAGE PEARLS

Assess for signs of hypoxia or imminent respiratory compromise, such as

• Increased work of breathing
• Use of accessory muscles
• Decreased oxygen saturation level
• Tachypnea
• Cyanosis
• Audible wheezing
• Altered mental status, drowsiness, inability to speak in full sentences, severe fatigue, a silent chest, unstable vital signs, or rapidly worsening dyspnea should prompt immediate escalation.
• Compare oxygen saturation with the patient’s known baseline or usual oxygen prescription when available. A significant fall from baseline may be more important than a single number.
• Patients with suspected acute respiratory failure should be stabilized without delaying EMS transfer for testing that can be completed in the emergency department.

HISTORY PEARLS

Patients with a history of chronic obstructive pulmonary disease (COPD) will often report an increase in dyspnea from baseline.

Those with chronic bronchitis will report increasing amounts of sputum that may change in color from white or clear to yellow or green.

Patients may report a low-grade fever; however, fevers of >38.5 C (101.3 F) should prompt consideration of an alternate diagnosis of pneumonia.

Ask about any triggers such as a recent infection or exposure to an environmental irritant.

Adherence to prescribed dosing of controller medication can give clues to whether medication nonadherence is the likely underlying cause.

The number of previous admissions for exacerbations can be useful in assessing severity.

Baseline oxygen saturation is an important part of the history because many patients with COPD have compensated to low saturations at their baseline. Deviations from baseline are more important than the actual number.

Weight gain and edema may indicate congestive heart failure.

The presence of chest pain should alert the provider to alternative diagnoses such as acute coronary syndrome and pulmonary embolus.

• Ask about previous ICU care, noninvasive ventilation or intubation, frequent exacerbations, recent hospitalization, recent antibiotics, and prior sputum cultures.
• Ask about the patient’s usual inhalers, home oxygen prescription, smoking and vaping, and whether a rescue inhaler has been used more frequently than usual.
• Purulent sputum is useful when deciding whether antibiotics may be beneficial, but sputum color alone does not establish pneumonia.

PHYSICAL EXAM PEARLS

Observe the patient for any signs of respiratory failure: tachypnea, chest retractions, accessory muscle use, cyanosis, and paradoxical movements of the abdomen. Get a full set of readings for vital signs, including pulse oximetry.

It is common to observe pursed-lip breathing. Severity of exacerbation can also be assessed by how many words the patient is able to speak before becoming dyspneic.

Cardiac exam: Patients with long-standing COPD may show signs of cor pulmonale, or right heart failure, which includes jugular venous pressure, peripheral edema, and relative hypotension.

Pulmonary exam: Wheezing and rhonchi are commonly heard. If wheezing is not appreciated and decreased breath sounds are present, a severe exacerbation should be considered.

Skin exam: Cyanosis indicates hypoxemia.

• Document mental status, work of breathing, air entry, speech, oxygen saturation, and response to initial bronchodilator treatment.
• Focal crackles, asymmetric breath sounds, new edema, fever, or pleuritic chest pain should increase suspicion for pneumonia, pneumothorax, heart failure, or pulmonary embolism rather than uncomplicated ECOPD.

TESTING PEARLS

Arterial blood gas (ABG)

• ABGs can be used in patients with moderate to severe exacerbations.
• When ABGs are available, comparison of baseline findings for acute respiratory acidosis and hypercapnia is key.

Blood gas testing is not routinely needed for a mild exacerbation managed in urgent care. Suspected acute hypercapnic respiratory failure, new confusion or drowsiness, severe respiratory distress, or failure of initial treatment should prompt ED transfer for blood gas assessment and ventilatory support rather than delay transfer.

Basic metabolic panel (consisting of tests for blood urea nitrogen, CO2, creatinine, glucose, serum chloride, serum potassium, and serum sodium levels)

• An increase in bicarbonate is commonly seen in patients with chronic hypercapnia and may provide a clue to chronic CO2 retention.
• Obtain additional laboratory testing only when the history, comorbidities, dehydration, medication use, or illness severity makes the result likely to change management.

Chest radiography is helpful for excluding an alternate diagnosis such as pneumonia, pneumothorax, pleural effusion, or heart failure when the history or exam is atypical. Routine radiography is not required for every mild, typical exacerbation that responds as expected.

An electrocardiogram should be obtained for patients reporting chest discomfort, palpitations, syncope, or when a cardiac cause of dyspnea is a reasonable concern.

Sputum culture and Gram staining are not routinely needed for uncomplicated outpatient exacerbations. Consider culture in patients with frequent exacerbations, severe airflow obstruction, prior resistant organisms or Pseudomonas, recent antibiotic exposure, or illness severe enough to require hospital-level care.

D-dimer should not be ordered simply because a patient with COPD is dyspneic. If pulmonary embolism is a consideration, first estimate pretest probability and use a validated PE pathway; COPD and inflammation may increase false-positive D-dimer results.

• Respiratory viral testing may be useful when results affect antiviral treatment, isolation, outbreak management, or the differential diagnosis.
• Do not delay transfer of a patient with respiratory failure to complete testing that can be performed at a higher level of care.

DIAGNOSIS PEARLS

Consider:

• Congestive heart failure: Look for other signs of heart failure such as peripheral edema and elevated jugular venous pressure.
• Pneumonia: Consider when fever, focal lung findings, pleuritic pain, marked systemic illness, or imaging suggests an infiltrate.
• Pneumothorax: Consider with sudden dyspnea, pleuritic chest pain, or unilateral/decreased breath sounds.
• Pleural effusion: Consider when there is dullness to percussion or decreased breath sounds.
• Pulmonary embolism (PE): Use a validated pretest-probability pathway; patients who cannot be safely excluded in urgent care require ED evaluation and definitive imaging.

Heart failure, pneumonia, pulmonary embolism, and pneumothorax are common mimics or contributors to apparent COPD exacerbations. More than one problem may be present at the same time.

TABLE 1. PRACTICAL SEVERITY ASSESSMENT OF ECOPD IN URGENT CARE

Severity	Clinical features	Urgent care implication
Mild	Dyspnea is limited; respiratory rate <24/min; heart rate <95/min; resting SaO2 is at least 92% on room air or usual oxygen and near baseline.	May be appropriate for outpatient treatment if there are no red flags, serious comorbidities, or concerning alternate diagnoses.
Moderate	Several features are abnormal, such as more intense dyspnea, respiratory rate at least 24/min, heart rate at least 95/min, or SaO2 <92% or >3% below known baseline.	Treat promptly and reassess. Lower threshold for imaging, additional testing, or ED transfer based on response and comorbidities.
Severe	Clinical features of a moderate exacerbation plus acute hypercapnia with acidosis when blood gas is obtained, or obvious acute respiratory failure.	Requires ED/hospital-level care; use EMS when respiratory failure, unstable vital signs, altered mental status, or ventilatory support may be needed.

The Rome classification also includes dyspnea intensity and C-reactive protein when available. In urgent care, respiratory rate, heart rate, oxygen saturation, baseline change, work of breathing, mental status, and response to initial treatment are often the most immediately useful variables.

TREATMENT PEARLS

Always follow advanced life support protocols for patients in respiratory arrest.

Give supplemental oxygen when the patient is hypoxemic, but use controlled oxygen. A reasonable acute target for patients with COPD at risk for hypercapnia is an oxygen saturation of approximately 88% to 92%, with escalation for blood gas assessment if hypercapnia or acidosis is suspected. Oxygen should not be withheld because of the outdated concept that it simply eliminates a patient’s respiratory drive.

Administer a short-acting beta2-agonist (SABA) by metered-dose inhaler with spacer or nebulizer. A short-acting anticholinergic may be added, especially for a moderate or severe exacerbation.

TABLE 2. COMMON INITIAL BRONCHODILATOR OPTIONS

Medication	Typical adult urgent care use	Comments
Albuterol by pMDI with spacer	1-2 puffs; may repeat about hourly for the first 2-3 doses, then every 2-4 hours according to response.	pMDI plus spacer and nebulization have similar bronchodilator efficacy when technique and drug delivery are adequate.
Albuterol nebulized	Commonly 2.5 mg per treatment; may repeat for the first 2-3 doses according to severity and response.	Nebulization may be easier for a sicker patient who cannot coordinate an inhaler. Avoid unnecessary high cumulative doses.
Ipratropium	May be combined with SABA for moderate/severe exacerbations; follow product/formulary dosing.	Short-acting anticholinergic therapy is an adjunct, not a substitute for assessment of respiratory failure.
Albuterol-ipratropium combination	May be used by pMDI or nebulizer according to product dosing.	Useful when both short-acting bronchodilator classes are indicated.

Corticosteroids should be administered as an adjunct to inhaled treatments for a clinically significant moderate or severe exacerbation.

• Prednisone 40 mg orally once daily for 5 days is a common adult regimen.
• Oral corticosteroids are preferred when the patient can take oral medication; they are as effective as intravenous therapy for most exacerbations.
• A routine taper is not needed after a 5-day course.
• Use caution in patients with diabetes, infection risk, or other conditions that may be worsened by systemic corticosteroids.

Many exacerbations are triggered by viral infection or environmental exposure. Antibiotics should not be automatic.

• Consider antibiotics when sputum purulence accompanies increased dyspnea and/or increased sputum volume, when there is a prior positive sputum culture relevant to the current episode, or when ventilatory support is required.
• For outpatient treatment when antibiotics are indicated, GOLD recommends a short course, generally no more than 5 days. Choice should reflect local resistance, allergies, recent antibiotics, and prior culture results.
• Common empiric outpatient options include amoxicillin-clavulanate, doxycycline, or a macrolide when appropriate. Fluoroquinolones should be reserved for selected patients rather than used routinely.
• Frequent exacerbations, severe airflow obstruction, prior Pseudomonas or resistant organisms, or recent hospitalization should lower the threshold for culture and hospital-level evaluation.

TABLE 3. EXAMPLE OUTPATIENT ANTIBIOTIC OPTIONS WHEN INDICATED

Medication	Example adult regimen	Important considerations
Amoxicillin-clavulanate	875/125 mg orally twice daily for 5 days.	Useful broad outpatient option; adjust for renal function and allergy.
Doxycycline	100 mg orally twice daily for 5 days.	Avoid in pregnancy; consider interactions and esophagitis counseling.
Azithromycin	500 mg orally on day 1, then 250 mg once daily on days 2-5.	Use only when appropriate for local resistance and patient-specific QT/drug-interaction risk.
Respiratory fluoroquinolone	Reserve for selected patients when other options are unsuitable or resistant organisms are a concern.	Adverse-effect profile and stewardship concerns make routine use undesirable; severe or resistant disease may warrant ED/hospital evaluation.

Antibiotic selection and dosing should be adjusted to renal function, allergies, recent antibiotic exposure, local susceptibility patterns, and prior cultures.

The original ABCD mnemonic remains useful as a quick reminder:

• A = Anticholinergic
• B = beta2-agonist
• C = Corticosteroid
• D = Do you need antibiotics?

Continue the patient’s maintenance inhalers when feasible. After an exacerbation, the long-term COPD regimen and exacerbation-prevention plan should be reviewed by the clinician who manages the patient’s chronic disease.

Noninvasive ventilation is the preferred initial ventilatory support for many patients with acute hypercapnic respiratory failure when no contraindication is present; this requires ED/hospital-level care and should not delay EMS transfer from urgent care.

DISPOSITION PEARLS

TABLE 4. REFERRAL AND FOLLOW-UP GUIDANCE

Disposition	Clinical features
EMS / emergency department	Acute respiratory failure; confusion or drowsiness; cyanosis; severe or rapidly worsening resting dyspnea; inability to speak normally; unstable vital signs; suspected pneumothorax, PE, ACS, pneumonia with sepsis, or acute heart failure; need for noninvasive ventilation; or failure to improve after initial treatment.
ED evaluation / hospital assessment	New oxygen requirement beyond the patient’s usual baseline; significant comorbidity; recurrent/frequent exacerbations; serious new physical findings; inadequate home support; or uncertain diagnosis that cannot be resolved safely in urgent care.
Outpatient urgent care management	Mild or improving exacerbation with stable vital signs, adequate oxygenation at or near baseline, safe ambulation, no concerning alternate diagnosis, ability to use medications correctly, and reliable follow-up.
Follow-up	Arrange early reassessment for patients treated as outpatients, particularly those with moderate symptoms, recent exacerbations, medication changes, or significant comorbidity. Long-term inhaler therapy, smoking cessation, vaccination, and prevention strategies should be reviewed in ongoing COPD care.

MEDICOLEGAL PEARLS

Patients with chronic COPD can be very fragile and may live near the edge of hypoxia and hypercapnia. Even small amounts of sedation can tip the balance and cause significant morbidity and mortality.

Always consider the possibility of spontaneous pneumothorax in the differential diagnosis.

Consider infection and sepsis when the clinical picture warrants it, but do not assume that every COPD exacerbation requires antibiotics.

Document and address abnormal vital signs before discharging the patient.

• Document the patient’s baseline oxygen requirement when known, presenting oxygen saturation, work of breathing, mental status, response to bronchodilator therapy, and rationale for outpatient care versus ED transfer.
• If oxygen is administered, document the target saturation and response rather than giving uncontrolled oxygen without reassessment.
• When PE, pneumonia, ACS, heart failure, or pneumothorax remains a meaningful alternative diagnosis, document the evaluation and disposition decision.

REFERENCES

1. Global Initiative for Chronic Obstructive Lung Disease. Global Strategy for Prevention, Diagnosis and Management of COPD: 2026 Report. GOLD; 2026.
2. Agusti A, Vila M, Siso-Almirall A, et al. Key recommendations for primary care from the 2026 GOLD update. npj Prim Care Respir Med. 2026. doi:10.1038/s41533-026-00544-z.
3. Wedzicha JA, Miravitlles M, Hurst JR, et al. Management of COPD exacerbations: an ERS/ATS guideline. Eur Respir J. 2017;49:1600791.
4. Celli BR, Fabbri LM, Aaron SD, et al. An updated definition and severity classification of chronic obstructive pulmonary disease exacerbations: the Rome proposal. Am J Respir Crit Care Med. 2021;204(11):1251-1258.
5. Leuppi JD, Schuetz P, Bingisser R, et al. Short-term vs conventional glucocorticoid therapy in acute exacerbations of chronic obstructive pulmonary disease: the REDUCE randomized clinical trial. JAMA. 2013;309(21):2223-2231.
6. Austin MA, Wills KE, Blizzard L, et al. Effect of high flow oxygen on mortality in chronic obstructive pulmonary disease patients in prehospital setting: randomized controlled trial. BMJ. 2010;341:c5462.
7. Ernst RL. Acute Exacerbations of Chronic Bronchitis. In: Urgent Care Textbook. 2014. Chapter 19, pp. 241-248.