Congestive heart failure (Canine) — NAVLE Prep

Quick anchor

Trigger

Cough or dyspnea with known heart disease

First step

Reduce respiratory distress first

Left vs right

Pulmonary edema vs effusions / ascites

Trap

Do not flood a CHF dog with fluids

Exam core — read this first

Left-sided CHF → pulmonary edema and respiratory distress

Right-sided CHF → cavitary effusion, hepatomegaly, ascites, jugular changes

Acute stabilization → oxygen + diuresis + calm handling

Board logic → identify the congestive pattern, then choose the appropriate stabilization

Pattern recognition

Core pattern

Cough or dyspneaTachypneaKnown murmur or cardiac disease

Supporting clues

Pulmonary cracklesExercise intoleranceAscites if right-sidedPleural effusion possibleSyncope history sometimes

NAVLE trigger: Boards often ask whether the patient is in left-sided pulmonary edema versus some other cause of respiratory distress.

Decision core — what NAVLE actually asks

Acute dyspneic CHF patient

→ Oxygen, minimize stress, and begin diuresis rather than aggressive fluid loading

Evidence of right-sided congestion

→ Think cavitary fluid / venous congestion rather than primary pulmonary edema

After stabilization

→ Long-term CHF control depends on underlying heart disease and chronic medication planning

Key interpretation

Thorax

Pulmonary edema or effusion

Depends on failure pattern

Respiratory rate

↑ High

Treat the distress

Perfusion

May be okay or poor

Some CHF dogs are not volume depleted

Left-sided clue

Pulmonary edema

Classic radiographic board answer

Right-sided clue

Ascites / pleural effusion

Points away from left-sided edema

Fluid therapy

Use caution

Do not worsen congestion

⚠ In a dyspneic CHF dog, fluids are not the reflex answer. The board often wants oxygen and diuresis instead.

Treatment

Acute

Oxygen + furosemide + minimal stress handling

This is the common stabilization pattern for left-sided CHF with edema.

Chronic

Chronic CHF management tailored to disease type

Pimobendan and diuretics are common board concepts.

Alt.

Drain effusions when indicated

Pleural or pericardial fluid questions may require procedure thinking.

NAVLE traps — where students lose marks

Do not treat dyspneic CHF like hypovolemic shock

Aggressive fluids can worsen congestion.

Left-sided and right-sided CHF do not look identical

Pulmonary edema versus effusion / ascites is a common separator.

Calm handling matters

Stress worsens respiratory distress.

A cough alone is not enough to prove CHF

The exam often asks you to integrate imaging and overall pattern.

Differentials — how to separate these on NAVLE

Fast separator: CHF is congestion from heart disease. The board contrasts it with primary respiratory disease, pericardial disease, and noncardiogenic dyspnea.

Problem	Main issue	Thoracic clue	Key separator
Left-sided CHF	Pulmonary edema	Cardiogenic edema pattern	Diuresis / oxygen logic
Right-sided CHF	Systemic venous congestion	Ascites / pleural effusion	Less about pulmonary edema
Primary pneumonia	Parenchymal inflammation	Infectious lung pattern	Not classic cardiac congestion
Pericardial effusion	Tamponade physiology	Cardiac silhouette / jugular clues	May need pericardiocentesis
Laryngeal disease	Upper airway	No edema pattern	Stridor / airway signs dominate

30-second revision

Left-sided CHFPulmonary edema

Right-sided CHFEffusions / ascites

Acute dyspneaOxygen + diuresis

AvoidReflex fluid loading

Critical trapCough alone ≠ automatic CHF

Practice questions

Pre-built NAVLE-style · Congestive heart failure

0 / 0

Q1Recognition

A dog with known cardiac disease is acutely dyspneic and has radiographic pulmonary edema. Which syndrome best fits?

Q2Next best step

Which immediate approach is most appropriate in acute cardiogenic pulmonary edema?

Q3Pattern separation

Which finding more strongly supports right-sided rather than left-sided CHF?

Q4Trap question

Why should fluid therapy be used cautiously in acute CHF?

Q5Differential

Which feature best separates cardiogenic pulmonary edema from primary pneumonia?