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

Acute Dyspnea

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In one line

·When someone suddenly cannot breathe, give oxygen right away, then figure out why.

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Normal physiology

·Breathing moves air in and out through open airways—your windpipe (trachea) and the branching tubes (bronchi and bronchioles) inside your lungs. Blood flows through tiny vessels (capillaries) wrapped around millions of tiny air sacs (alveoli) deep in your lungs. Gas exchange—oxygen jumping into the blood, carbon dioxide jumping out—happens across the thin walls between air sacs and capillaries. A control center in your brainstem (the medulla, the breathing control center at the base of your brain) watches oxygen and carbon dioxide levels in your blood and adjusts how fast and how deep you breathe to keep them balanced. Picture this: air flows in, oxygen hops into the blood, carbon dioxide hops out, and air flows out—all automatic, all the time. Keep this picture in mind, because every abnormal finding in acute trouble breathing (dyspnea) (sudden trouble breathing) is a break in one of these jobs.

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What goes wrong

·One thing breaks upstream, and every abnormal finding you see downstream points back to that one break. The job is to read the clues backward to find it.

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Hallmark signs

·Fast breathing (Tachypnea) (breathing faster than 20 breaths per minute in adults)
·Accessory muscle use (you can see neck, shoulder, or belly muscles working hard during breathing)
·Intercostal or supraclavicular retractions (skin sucks in between the ribs or above the collarbone when you breathe in)
·Inability to speak full sentences (can only get out 2 to 3 words per breath)
·A high-pitched noise on breathing in (Stridor) (a loud, high-pitched squeaky sound when breathing in)
·Wheezing (a musical, whistling sound when breathing out)
·Crackles or crackles in the lungs (rales) (popping or crackling sounds when breathing in)
·Silent chest (very quiet or no breath sounds even though the person is trying hard to breathe)

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Red flags · escalate now

·Silent chest (no breath sounds) in someone struggling to breathe or having an asthma or COPD attack—means almost no air is moving and breathing may stop completely any second.
·Confusion, drowsiness, or not responding—means the brain isn't getting enough oxygen or carbon dioxide is building up dangerously high in the blood.
·Can only speak 2 to 3 words per breath—means breathing is taking every bit of energy and the person is in severe respiratory distress.
·A high-pitched noise on breathing in (Stridor) (high-pitched squeaky sound when breathing in)—means the upper airway is blocked or swelling shut and could close off completely, cutting off all air.
·Blue lips, tongue, or nail beds even with oxygen being given—means oxygen levels are dangerously low (usually below 85 percent) and the lungs can't deliver enough oxygen to the blood.

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Workup

·Pulse oximetry (oxygen saturation measurement)
·Arterial blood gas (ABG)
·Chest X-ray
·B-type natriuretic peptide (BNP or NT-proBNP)
·Cardiac troponin (I or T)
·D-dimer
·CT pulmonary angiography (CTPA, computed tomography scan with contrast dye to see lung blood vessels) or ventilation-blood flow (perfusion) (V/Q) scan
·Electrocardiogram (ECG, heart tracing showing electrical rhythm)

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Treatment

·Supplemental oxygen titrated to target saturation (88–92% for COPD, 94–98% for all others)
·Epinephrine intramuscular (0.3–0.5 mg in thigh) for anaphylaxis, or nebulized albuterol (2.5–5 mg) plus ipratropium (0.5 mg) for asthma or COPD flare-up
·Systemic corticosteroids (methylprednisolone 125 mg IV, or prednisone 40–60 mg by mouth, or dexamethasone 6–12 mg IV or by mouth) for asthma flare-up, COPD flare-up, or anaphylaxis
·Loop diuretic (furosemide 40–80 mg IV) plus nitroglycerin (sublingual 0.4 mg or IV starting 5–10 mcg/min) plus noninvasive positive pressure ventilation (NIPPV: BiPAP or CPAP) for acute cardiogenic pulmonary edema (fluid flooding the lungs)
·Needle decompression (14- or 16-gauge catheter at 2nd rib space midclavicular line or 5th rib space front of armpit line) or chest tube (thoracostomy) for tension pneumothorax
·Anticoagulation (unfractionated heparin 80 units/kg IV bolus then 18 units/kg/hour drip targeting aPTT 1.5–2.5 times control, or low-molecular-weight heparin such as enoxaparin 1 mg/kg subcutaneously twice daily, or direct oral anticoagulant such as apixaban 10 mg twice daily for 7 days then 5 mg twice daily) plus thrombolytic therapy (alteplase 100 mg IV over 2 hours) if massive or high-risk PE with hemodynamic instability (systolic BP below 90 mmHg or signs of shock)
·Antibiotics (ceftriaxone 1–2 g IV daily plus azithromycin 500 mg IV or by mouth daily, or levofloxacin 750 mg IV or by mouth daily) for community-acquired pneumonia causing acute trouble breathing (dyspnea)

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NCLEX trap

·In acute trouble breathing (dyspnea) with low oxygen saturation (below the target for that patient), oxygen is always the first step. Correct the life-threatening low oxygen immediately, then investigate the cause and give targeted therapy. Treating the underlying disease before correcting low oxygen in the blood (hypoxemia) (too little oxygen in the blood) puts the patient at risk for cardiac arrest (the heart stops) or brain injury (brain cells die without oxygen).
·In severe asthma, a silent chest means airflow is so blocked that almost no air is moving—this is a sign the patient is about to stop breathing, not a sign of improvement. A silent chest is a red flag that requires immediate escalation: continuous albuterol (a medicine that opens airways by relaxing the smooth muscle wrapped around them), intravenous magnesium sulfate (relaxes airway smooth muscle), intravenous corticosteroids (reduce airway swelling), and preparation for intubation (inserting a breathing tube through the mouth into the windpipe).
·In acute trouble breathing (dyspnea), look at the whole picture: breathing rate, work of breathing (using accessory muscles like those in the neck and shoulders, flaring nostrils, skin sucking in between ribs), ability to speak, mental status, skin color and warmth, and oxygen saturation. A patient with normal oxygen saturation but extreme effort to breathe is at high risk for respiratory failure (the breathing muscles get tired and stop working). Clinical assessment—not just the oxygen number—guides decisions about noninvasive ventilation (machines that push air in through a mask) and intubation.
·In acute trouble breathing (dyspnea), young age does not exclude pulmonary embolism (a clot lodging in a lung artery) (a blood clot in the lung), spontaneous pneumothorax (collapsed lung), anaphylaxis (severe allergic reaction), or pneumonia (lung infection). Perform a focused physical exam: listen for decreased breath sounds on one side (pneumothorax), check for one-leg swelling or calf tenderness (deep vein clot formation (thrombosis) suggesting PE), look for hives or swollen lips or tongue (allergic reaction), and check for fever and cough with coughed-up mucus (sputum) (pneumonia). Obtain vital signs, oxygen saturation, and if indicated, D-dimer (a blood test that helps rule out clots), chest X-ray, and electrocardiogram before assuming the symptoms are from anxiety.
·In acute trouble breathing (dyspnea), clinical deterioration despite initial bronchodilator therapy (breathing treatment) means the patient is progressing toward respiratory failure. Escalate immediately: start continuous nebulized albuterol (breathing treatment running nonstop), give intravenous corticosteroids and magnesium sulfate (for asthma), start noninvasive positive-pressure ventilation (a machine that pushes air in through a mask) if the patient can still protect their airway, call for respiratory therapy and physician backup, and prepare for endotracheal intubation (inserting a breathing tube). Do not wait for the next scheduled treatment when work of breathing is increasing or the patient is becoming confused or sleepy.

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