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Canine and feline caval syndrome

K N Strickland1

  • 1Louisiana State University, School of Veterinary Medicine, Baton Rouge 70803, USA.

Clinical Techniques in Small Animal Practice
|October 1, 1998
PubMed

Insights

Caval syndrome, a severe heartworm complication in dogs and cats, involves adult worms migrating to the heart, causing critical organ dysfunction and high mortality. Prompt removal of heartworms is crucial for survival.

Area of Science:

  • Veterinary Medicine
  • Parasitology
  • Cardiology

Background:

  • Caval syndrome is a life-threatening complication of Dirofilaria immitis infection in dogs and cats.
  • It arises from adult heartworms migrating from pulmonary arteries into the right heart chambers and vena cavae.
  • This migration causes severe clinical signs and organ damage.

Purpose of the Study:

  • To describe the pathophysiology, clinical presentation, and therapeutic interventions for caval syndrome in companion animals.
  • To highlight the critical nature and poor prognosis associated with this condition.

Main Methods:

  • Review of clinical cases and existing literature on Dirofilaria immitis-induced caval syndrome.
  • Pathophysiological analysis of worm migration and its impact on cardiovascular and organ function.

Main Results:

  • Caval syndrome presents with anorexia, respiratory distress, anemia, hemoglobinuria, and hepatic/renal dysfunction.
  • Adult heartworms in the right heart disrupt the tricuspid valve, leading to insufficiency and pulmonary hypertension.
  • Hemolysis occurs due to red blood cell trauma within the worm mass, contributing to anemia.

Conclusions:

  • Caval syndrome is a grave complication of heartworm disease with high mortality.
  • Therapy focuses on supportive care and surgical removal of the heartworm burden.
  • Prognosis is guarded to poor, emphasizing the importance of heartworm prevention.

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