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Heartworm Disease in Domestic Cats
by Kadirvelu Senthilkumar
Heartworm in cat is caused by Dirofilaria immitis is another vector borne helminthes infection of Zoonotic significance. The adults remain in the right ventricle, pulmonary artery and vena cava. Microfilaria can be detected in any tissue particularly blood, kidneys and lungs. Mortality due to heartworm disease is rare.
Incidence Dirofilariasis is widespread in tropical/subtropical countries and temperate areas, which favor rapid breeding of fly population. The heartworm in cats is noticeable among the 3-6 years old ones.
CausesDirlofilaria immitis is a long slender roundworm measuring about 300 mm in length, which can be readily recognized in right ventricle of heart, pulmonary artery and vena cava and occasionally in lungs in heavy infections.
Microfilaria measuring about 286-349 millimicrons in length can also be identified in both dry and wet blood smears in clinically affected animals. Periodicity of microfilaria particularly at nighttime has been reported.
TransmissionThe life cycle of heartworm in cat is indirect. In hot and humid climate, the disease is transmitted through bite of mosquitoes and lice where the microfilaria develops into infective stage.
Clinical SignsNo clinical have been reported during the life and the disease usually occurs as in apparent infection. Other signs include-
Occasional coughing
Asthma-like symptoms
Anorexia
Lethargy
Vomiting
Incre respiratory effort
PathologyThe parasites are generally noticed at necropsy as an incidental finding. Similarly microfilariae are also observed during routine screening of blood smears of felids having apparently normal health in endemic areas.
In heavy infection of heartworm disease, the pulmonary artery and vena cava may be occluded with parasites causing mechanical obstruction, passive hyperaemia and occasional initial damage.
DiagnosisThe disease in the domestic cats is usually detected on necropsy examination. The disease can also be diagnosed by examination of blood smears and demonstration of characteristic microfilaria. Confirmative diagnosis can be performed with the help of X-rays. The heartworm disease in domestic cats should be differentiated from Feline asthma and other pulmonary diseases.
TreatmentIn endemic areas of heartworm disease, Diethyl carbamazine citrate (3mg/kg) may be tried after discussing with your vet. The effectiveness of acetarasamide for adulticidal action and levamisole and ivermectin (24 ug/kg) for antimicrobial action is yet to be assessed perfectly.
Prevention and controlApart from vigorous fly and lice control measures, periodic treatment followed by serological monitoring and blood screening for microfilaria will be helpful in controlling heartworm in domestic cats in endemic areas.
About the Author
Kadirvelu Senthilkumar is a regular contributor to Cat Health Care, a section of Cat Health Care Guide, a site focusing on conventional and natural treatments of feline health concerns.
What a 49cm/20 in snow fall looks like
This is outside our house in Ottawa March 8, 2008 after the biggest snowfall I have ever seen and I am 62 years of age
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