Compare conditions

Put any two — or three — conditions side by side, adult or pediatric, to spot the look-alike differences fast, row by row.

COPD · Chronic Obstructive Pulmonary Disease

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In one line

·Air goes in but cannot come back out.

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Normal physiology

·Breathing in takes muscle work. Your diaphragm (the big sheet of muscle under your lungs) pulls down and your chest opens so air rushes in. Breathing out is easy: the diaphragm relaxes, the lungs spring back like a rubber band, and air flows out without any effort. Airways stay open because the stretchy lung tissue around them holds them up like tent stakes.

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What goes wrong

·Years of breathing in cigarette smoke, air pollution, or chemical fumes damage the lungs in two big ways. First, the airways get swollen and irritated on the inside, the walls get thick, and they make extra sticky mucus that clogs them (chronic bronchitis). Second, the stretchy lung tissue breaks down (that is emphysema), so the airways lose their support and collapse shut when you try to breathe out. Air gets trapped inside. A flare-up (exacerbation) happens when something pushes you over the edge — a cold, the flu, breathing in dust or smoke, or missing your inhaler medicine.

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Hallmark signs

·Breathing out slowly through pursed lips (like blowing out a candle)
·Neck and shoulder muscles working hard to breathe
·Barrel chest (the chest looks round and fat, like a barrel)
·Sitting leaning forward with hands on knees (tripod position)
·Chronic cough that brings up mucus (sputum), especially in the morning
·Shortness of breath that gets worse with activity
·Wheezing (a whistling sound when breathing out)
·Unintended weight loss and muscle wasting

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Red flags · escalate now

·New confusion, drowsiness, or difficulty staying awake (sign of carbon dioxide building up and respiratory failure)
·Blue or gray lips, tongue, or fingernails (sign of dangerously low oxygen)
·Chest pain or coughing up blood (may mean infection has spread, a clot in the lung, or lung tissue tearing)
·Sudden worsening shortness of breath at rest or inability to speak in full sentences (sign of severe flare-up or collapsed lung)
·Swelling in the ankles and legs with a bloated belly (sign the right side of the heart is failing from lung strain)

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Workup

·Arterial blood gas (ABG)
·Chest X-ray
·Spirometry (breathing test with forced expiration)
·Oxygen saturation (pulse oximetry or ABG)
·B-type natriuretic peptide (BNP) or NT-proBNP
·Coughed-up mucus (Sputum) culture (if coughed-up mucus is thick, colored, or patient is very sick)

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Treatment

·Short-acting bronchodilators (albuterol nebulized plus ipratropium)
·Systemic corticosteroids (prednisone 40 mg by mouth daily or methylprednisolone IV) for 5 days
·Controlled supplemental oxygen to keep oxygen saturation at 88 to 92 percent
·Bilevel positive airway pressure (BiPAP or noninvasive ventilation) if CO2 rises above 50 mmHg and drowsiness starts
·Antibiotics (azithromycin, amoxicillin-clavulanate, or doxycycline) if coughed-up mucus (sputum) is pus-filled (purulent) or patient is very sick
·Remove the trigger (stop smoking, restart home inhalers, treat infection, move away from dust or fumes)
·Pulmonary rehabilitation and vaccination (influenza yearly, pneumococcal, COVID-19) after acute crisis

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NCLEX trap

·In COPD, use controlled oxygen to aim for 88–92% oxygen saturation. High-flow oxygen can shut off the patient's main drive to breathe (which runs on low oxygen signals) and let CO₂ build up to dangerous, brain-poisoning levels. This is called hypercapnic respiratory failure.
·A falling breathing rate in a struggling COPD patient means their breathing muscles are exhausted and giving up—not that they're improving. This is a red flag for impending respiratory failure. Get ready to support their breathing with BiPAP or a breathing tube.
·COPD flare-up (exacerbation) needs short-acting bronchodilators first (albuterol and ipratropium) to open the airways, plus systemic steroids to shrink airway swelling. Add antibiotics only if the patient has thick, colored coughed-up mucus (sputum) or clear signs of bacterial infection (fever, elevated white count). Treat the airway blockage before chasing infection.
·In stable COPD, CO₂ is often chronically high (the patient has adapted over time). If CO₂ suddenly drops during an flare-up (exacerbation), it may mean the patient is hyperventilating in panic or exhaustion and is about to crash. Low CO₂ in acute COPD is not reassuring—it's a warning sign.
·Non-invasive ventilation (BiPAP) for hypercapnic (high CO₂) respiratory failure in COPD cuts the need for intubation by half and reduces death. Try BiPAP first before putting a breathing tube down, unless the patient cannot protect their airway or is in cardiac arrest.
·Drowsiness in a COPD patient with breathing trouble is CO₂ narcosis—the brain is being poisoned by trapped carbon dioxide. This is a medical emergency. The patient needs urgent help getting CO₂ out (BiPAP or intubation), not sedation or sleep.

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