Cardiovascular · Topic 11 of 34
Acute Pulmonary Edema (ADHF)
The patient who was stable on their heart failure regimen this morning is now sitting bolt upright, pink frothy sputum at their lips — what you do in the next 10 minutes determines survival.
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Acute Pulmonary Edema (ADHF)
A weak left ventricle backs fluid into the lungs. Sit up, oxygen, IV furosemide.
The failing left ventricle cannot pump blood forward. Pressure backs up into the capillaries of the lungs and pushes fluid into the alveoli, which flood and froth: acute pulmonary edema. The SpO2 falls.
- The weak left ventricle can't pump forwardNurse seessevere dyspnea, orthopnea, anxiety, diaphoresisNurse doessit bolt upright, legs down (not if BP is low)
- Pressure backs up into the lung capillariesNurse seescrackles that coughing won't clear; JVD, S3Nurse doesoxygen to keep SpO₂ above 92%
- Fluid floods the alveoli: pink frothNurse seespink frothy sputum, SpO₂ fallingNurse doesget help now; IV furosemide; CPAP/BiPAP if it persists
High Fowler's: less blood returns to the heart and breathing eases · avoid legs-down if the BP is low
If distress or low SpO₂ persists: CPAP or BiPAP — it cuts the need for intubation
A loop diuretic · diuresis starts within about 5 minutes, peaks within 30 · expect brisk urine
Common triggers
Ask what changedMost flares follow a skipped pill, a salty meal or a new heart problem
What you'll see
SignsLab clue
BNPA BNP scale in pg/mL. Under 100, heart failure is unlikely; over 400 points to the heart. BNP sits at 60. The overfilled left ventricle stretches and releases BNP, and the level climbs past 400 to 720: the dyspnea is cardiac.
- The overfilled ventricle stretchesNurse seessudden dyspnea: heart or lungs?
- BNP climbs past 400: the heartNurse seesBNP over 400 pg/mLNurse doestreat it as cardiac: upright, oxygen, diuretic
Red flags
Act nowTreatment: sit up, oxygen, furosemide
In this orderUpright, oxygen, IV furosemide — nitroglycerin when the BP is high
A loop diuretic. Diuresis starts within about 5 minutes and peaks within 30.
Scant urine and no easier breathing: notifyLowers preload (and afterload at higher doses) — it fits pulmonary edema with a high BP.
Hold if systolic BP is under 90Noninvasive ventilation when oxygen alone is not enough — it cuts the need for intubation.
Used cautiously, if at all: it can depress breathing and drop the BP.
Diuretics and nitrates come firstMore detail
Nursing priorities
In orderPulmonary edema or cardiogenic shock?
Don't confuseBoth come from a failing left ventricle: edema is fluid backing up, shock is forward flow failing
| Blood pressure | Often high |
|---|---|
| Skin | Diaphoresis |
| Urine | Brisk after IV furosemide |
| Mind | Anxious |
| Position | Bolt upright, legs down |
| Drugs | IV furosemide, nitroglycerin |
Teach your patient
Before dischargePink frothy sputum means the lungs are flooding. Sit them up, oxygen on, furosemide in — and get help now.
Sources · Heart Failure — Medical-Surgical Nursing 12.3 (OpenStax) · Cardiogenic Pulmonary Edema (StatPearls, NCBI Bookshelf) · Congestive Heart Failure and Pulmonary Edema (StatPearls, NCBI Bookshelf; archived 2022) · Heart Failure (StatPearls, NCBI Bookshelf; updated 2025) · Furosemide injection label (DailyMed) · Nitrates — Pharmacology for Nurses 18.7 (OpenStax) · Morphine in the Setting of Acute Heart Failure: Do the Risks Outweigh the Benefits? (Cardiac Failure Review 2020; PMC) · Natriuretic Peptide B Type Test (StatPearls, NCBI Bookshelf) · Heart Failure — Pharmacology for Nurses 19.1 (OpenStax) · Films: the NurseSavvy learning-flow visuals. Follow your facility's protocol.
Acute Pulmonary Edema (ADHF)
The patient who was stable on their heart failure regimen this morning is now sitting bolt upright, pink frothy sputum at their lips — what you do in the next 10 minutes determines survival.
Acute decompensated heart failure (ADHF) is a rapid worsening of HF symptoms requiring urgent intervention. Pulmonary edema — its most dangerous presentation — occurs when the left ventricle can no longer move blood forward, causing fluid to back up into the pulmonary capillaries and flood the alveoli. The hallmark triad is severe dyspnea, orthopnea, and pink frothy sputum. You'll hear crackles (rales) that don't clear with coughing, often bilateral from the bases upward. SpO₂ drops rapidly. The patient is anxious, diaphoretic, tachycardic, and often hypertensive from sympathetic activation. Immediate nursing actions follow the mnemonic LMNOP: Lasix (IV furosemide 20–80 mg), Morphine (if ordered — causes venodilation and anxiolysis, used cautiously now), Nitroglycerin (sublingual or IV to reduce preload and, at higher doses, afterload), Oxygen (high-flow, non-rebreather or BiPAP if SpO₂ < 90%), and Position (high Fowler's with legs dangling to pool blood peripherally and reduce venous return). Continuous cardiac monitoring and frequent VS are mandatory. Strict I&O with an indwelling catheter tracks diuretic response — expect urine output within 15–30 minutes of IV furosemide. Weight is the most reliable indicator of fluid loss.
Key Distinctions
Don't confuse ADHF pulmonary edema (acute dyspnea, pink frothy sputum, bilateral crackles) with pneumonia (fever, productive colored sputum, often unilateral). Students mistake BiPAP for mechanical ventilation — BiPAP is noninvasive positive pressure that keeps alveoli open and is a first-line respiratory support in ADHF. Morphine was once standard but is now used cautiously due to hypotension and respiratory depression risk — current guidelines favor nitroglycerin and diuretics first.
Clinical Pearl
LMNOP saves lives: Lasix, Morphine (cautiously), Nitro, Oxygen, Position upright with legs dangling — preload reduction is the entire game in flash pulmonary edema.
Knowledge Check
3 quick questions on the must-knows for this topic.
Which finding is a hallmark of acute pulmonary edema?
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