The physical presence of the heartworms irritates vessel and heart walls and, depending upon the number present, occlude vessels, causing the heart to pump harder against increased resistence to blood flow. (uvma.org)
The physical presence of the heartworms irritates the vessel and heart walls, and, depending on the number present, occlude vessels, causing the heart to pump harder against increased resistance to blood flow. (bethayresveterinary.com)
Complete blood counts and blood tests for kidney and liver function may give an indirect indication of the presence of heartworm disease. (chai-online.org)