Heart failure syndrome: left- and right-sided signs !

Syndrome

When the heart cannot pump well, fluid builds up behind it: in the lungs if the left side fails, in the body if the right side fails.

Updated 2026-11-01

See it in 3D: Left ventricle · Right ventricle · Internal jugular vein · Liver

What it is

Heart failure is a syndrome: the heart cannot maintain output without raising its filling pressures. The signs make sense as congestion behind the failing ventricle. The most common cause of right-sided failure is left-sided failure.

Key findings

Left-sided: exertional dyspnea, orthopnea, paroxysmal nocturnal dyspnea, basal crackles, S3, displaced apex, tachycardia, pleural effusion, pulsus alternans.
Right-sided: raised jugular pressure, positive hepatojugular reflux, tender hepatomegaly, ascites, bilateral dependent pitting edema.
Framingham criteria: the clinical diagnosis needs two major, or one major and two minor.
Framingham major: paroxysmal nocturnal dyspnea, jugular distension, crackles, cardiomegaly, acute pulmonary edema, S3, hepatojugular reflux.
For nursing: daily weight at the same time, fluid balance, orthopnea (number of pillows), edema and new dyspnea are charted and reported.

Pathophysiology

Left-sided failure: pressure rises in the left atrium and pulmonary veins, fluid moves into the interstitium and alveoli: dyspnea, orthopnea, paroxysmal nocturnal dyspnea, crackles.
Right-sided failure: systemic venous pressure rises: distended neck veins, congested liver, leg edema, ascites.
Low output: fatigue, cool extremities, oliguria, confusion, hypotension in advanced stages.
Activation of the renin–angiotensin–aldosterone and sympathetic systems retains salt and water and worsens congestion.

Common causes

Ischemic heart disease and hypertension: the most common causes.
Valve disease, especially rheumatic in Colombia and the region; Chagas cardiomyopathy in endemic areas; dilated cardiomyopathy.
Isolated right-sided failure: pulmonary hypertension, COPD (cor pulmonale), pulmonary embolism, right ventricular infarction.
Triggers of decompensation: infection, atrial fibrillation, ischemia, excess salt or fluid, stopping treatment, nonsteroidal anti-inflammatory drugs.

Tests that confirm it

Natriuretic peptides (BNP or NT-proBNP): high values support the diagnosis; normal values make it unlikely.
Echocardiography: ejection fraction, chamber size, valves.
Chest X-ray: cardiomegaly, vascular redistribution, Kerley B lines, effusion. ECG: ischemia, arrhythmias.

Test yourself

Think of the answer, then tap the question to see it.

Which signs point to congestion from left ventricular failure?

Exertional dyspnea, orthopnea, paroxysmal nocturnal dyspnea, basal crackles and S3.

What is the most common cause of right-sided heart failure?

Left-sided heart failure, which raises pulmonary pressures and overloads the right ventricle.

Which cardiomyopathy should be considered in a patient from an endemic rural area of Colombia with heart failure and conduction blocks on the ECG?

Chagas cardiomyopathy, caused by Trypanosoma cruzi.

Which simple nursing record best detects fluid retention?

Daily weight, at the same time on the same scale, together with fluid balance.

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See it in 3D

The structures of Durgical's 3D anatomy where it is found.

← All of the clinical exam

Educational content on the clinical exam; it is learned and practised under supervision. It does not replace assessment by a health professional and is not for self-diagnosis.

Sources: Heart failure: MedlinePlus Medical Encyclopedia (MedlinePlus, U.S. National Library of Medicine, 2026); 24.3 Nursing Assessment - Clinical Nursing Skills | OpenStax (OpenStax (Rice University), 2024); 18.2 Cardiovascular System - Clinical Nursing Skills | OpenStax (OpenStax (Rice University), 2024).

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Representative model, for educational purposes only.