Vet Blog

02/20/09

Why do Elderly Cats Suffer From Chronic Sinus Congestion?
Dr. Eric Barchas, DVM

593255_1185602848.jpgWhat does it mean when a cat is congested all the
time? Our Cat is 17 years old. She always sounds
like she has a cold.

Leigh
Bradford, ON, Canada

Chronic sinus congestion in cats has several causes. Some of them are very benign. For instance, breeds with short noses such as Persians have irregular sinus anatomy. This can cause chronic wheezing, snorting, or sniffling as air moves through convoluted passages in the flattened nose.

Another relatively harmless cause of nasal stuffiness is a previous, severe sinus infection. Such infections can lead to changes in anatomy that cause congestion after the infection has resolved.

You should be aware that medical conditions also can lead to sinus congestion. Active respiratory infections are very common. In some pets, especially the very young and very elderly, these infections may linger for weeks or months. Nasal discharge is a common consequence of respiratory infections.

Sinus infections are more serious than respiratory infections. They will cause nasal congestion, often with discharge. Dental infections are common causes of sinus infections and sinus congestion.

I hate to bring it up, but in older cats nasal or oral tumors sometimes cause sinus congestion.

Less common causes of the symptoms you describe include fungal infections of the nose or sinuses (a fungus called Cryptococcus is especially prone to growing in the nose), a syndrome mediated by the immune system called sinusitis or foreign objects such as foxtails or blades of grass in the nose.

Allergies, a leading cause of nasal problems in humans, rarely cause the same symptoms in cats. Cats with allergies are more likely to suffer skin trouble.

You probably saw this coming: I recommend that you take your cat to the vet. Together you can work to determine whether her symptoms represent a serious problem.

Photo: Juniper’s nose looks healthy.

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01/09/09

JAVMA Reports on Efficacy of New Injectable Antibiotic
Dr. Eric Barchas, DVM

226px-insulinowka.jpgA few months ago I wrote about a new antibiotic called Convenia. The medicine is available by injection and lasts for a week or longer, eliminating the need to give daily (or, in many cases, twice daily) doses of pills or liquids.

In my original post I mentioned a few reservations I had about prescribing the drug. One of my (not explicitly mentioned) reservations was that there were few independent clinical efficacy and safety studies published in peer-reviewed journals.

That is beginning to change. A study released in the January 1, 2009 Journal of the American Veterinary Medical Association (JAVMA) compared Convenia to a commonly used conventional antibiotic in cats. Here are the results.

Effectiveness of [Convenia] in the treatment of cats with abscesses and infected wounds was similar to that of [the conventional antibiotic]. There were no serious adverse events or deaths related to treatment. (J Am Vet Med Assoc 2009;234:81-87)

This study does not address the long term concerns about injection-site tumors in cats that I mentioned in the original post. But it, combined with my personal experience with the medication (which has been highly favorable), makes me feel better about using Convenia in cats who refuse to take oral medications.

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08/09/08

New Antibiotic May Prove to be Convenient for Pets and Their People
Dr. Eric Barchas, DVM

syringe2.jpgWhen I diagnose an infection in a patient, I must prescribe antibiotics. For the person who lives with the pet, that can mean a week or more of giving pills (or a liquid formulation) at home. Under the best circumstances, giving medicine to pets is inconvenient. In the worst cases, it is impossible.

However, a new antibiotic has been approved for use in cats and dogs. It may eliminate the need to give pills at home when pets are diagnosed with certain types of infections.

The antibiotic, called Convenia, was released earlier this year by Pfizer. It is given by injection at the vet’s office. Each injection is effective for up to two weeks. Pets that receive Convenia do not need to take antibiotics at home.

Convenia has two other advantages over conventional antibiotics. First, studies have shown that side effects occur less often with Convenia than with comparable oral antibiotics.

Second, antibiotic-resistant strains of bacteria may be less likely to develop when pets are treated with Convenia. Improper dosing (skipping doses or stopping the medication too soon) is a leading factor in the evolution of antibiotic resistance. Pets that receive Convenia are virtually assured of proper dosing.

So, are vets going to stop stocking other types of antibiotics now that Convenia has hit the market? No. There are two sides to every coin, and I can see a few potential disadvantages to the new medicine.

First, Convenia is not effective against all types of infections. It is labeled for skin infections, wounds and abscesses only.

Also, when a pet develops side effects from oral antibiotics, the medicine can be stopped. Side effects from Convenia are rare. However, if they develop there is no way to discontinue treatment or remove the drug from the pet’s body.

Finally, as a veterinarian I am wary of giving too many injections to cats. This stems from the link between some vaccines and certain types of tumors. Convenia has not been linked to tumors in cats. Nonetheless, I plan to be cautious until the drug has been on the market for a while longer.

The bottom line is that Convenia isn’t perfect. But no medicine is. Convenia may prove to be very useful indeed.

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