Heart failure: left versus right
Failure backs fluid up behind the failing side. Name the chamber, follow the blood backwards, and the assessment findings write themselves. You never have to memorize the lists.
| LEFT-SIDED FAILURE | RIGHT-SIDED FAILURE | |
|---|---|---|
| Where it backs up | Into the pulmonary circulation | Into the systemic venous circulation |
| What you hear | Bilateral crackles, an S3 gallop | Usually a quiet chest |
| What you see | Dyspnea on exertion, orthopnea, paroxysmal nocturnal dyspnea, a persistent dry cough, restlessness, fatigue | Jugular venous distention, dependent pitting edema, ascites, hepatomegaly with right upper quadrant fullness |
| What you measure | Oxygen saturation, work of breathing, sleep position | Daily weight, abdominal girth, edema depth, nocturia pattern |
| The acute face of it | Pink frothy sputum with severe dyspnea: acute pulmonary edema | Progressive weight gain over days |
| What they test | Whether the candidate can place a cue on the correct side | Whether the candidate reports a weight trend before crackles appear |
The crossover note
The most common cause of right-sided failure is left-sided failure. A patient can legitimately present with crackles and ankle edema at the same time, and the exam uses that overlap to see whether the candidate abandons the model. Assign each cue individually; do not force the whole picture onto one side.
The one measurement
- Same scale, same time of day, after voiding, before breakfast, in similar clothing.
- Report a gain of two to three pounds in one day, or five pounds in one week.
- The scale detects retained fluid days before the stethoscope hears it, which is why home weight teaching is a tested intervention rather than a courtesy.
Memory hookLEFT is Lungs. Everything else drains to the right.
Margin notelungs are left; the rest of the body is right.
Watch outpink frothy sputum with severe dyspnea is acute pulmonary edema. Sit the patient upright, apply oxygen, and escalate immediately.
TakeawayThe scale catches decompensation days before the stethoscope does.
→ BOOK 08 · P6 for heart failure staging · → BOOK 07 · P8 for BNP