Providing Oxygen for a Cat With Congestive Heart Failure: Options and Considerations

Managing Comfort in Feline Congestive Heart Failure

Reader Usha writes: “I have a 10-pound Sphynx cat who is 14 years old, and she was recently diagnosed with congestive heart failure (CHF). What kind of oxygen cage and concentrator can be used at home when she needs help breathing or to transfer her to the veterinary clinic? The clinic is 60 minutes away.”

Caring for a Cat With CHF

In the early stages of CHF, most cats require only stress reduction and routine medical treatment, which includes diuretics to prevent fluid accumulation in the lungs. As fluid builds up, breathing becomes increasingly labored; nevertheless, many cats will need oxygen therapy. Since your cat may have already experienced this difficulty by the time she saw the veterinarian, it is wise to consider oxygen therapy now rather than later.

If the condition progresses but your cat still enjoys a good quality of life and requires only mild support, you might consider purchasing an inhalation tank to keep her in for about an hour daily or during long car trips.

Is an Oxygen Tank the Best Option?

Based on how cats with CHF respond in a tank compared to other methods, the answer is no. Research indicates that these devices often do not deliver sufficient oxygen to cats with acute heart failure and low blood oxygen levels, and it can take 20 to 30 minutes to raise the oxygen concentration above 35 percent inside the cage—a level high enough to assist a hypoxic cat.

When oxygen levels inside the cage exceed 50 percent, there is a fire risk, which is why the National Fire Association does not recommend them; even a tiny spark could ignite a fire.

Superior alternatives for oxygen delivery exist. Cats that do not improve with an oxygen tank often respond to high-flow oxygen therapy, where an oxygen tube is placed into the nostrils. This is the same type of oxygen delivery system used in hospitalized humans and may be the only way to save a cat with severe hypoxia. (1)

If you choose to buy a tank, you can calculate the required oxygen flow based on your cat's weight. The formula is milliliters per kilogram per minute, so for a 7-pound cat, the regulator flow rate should be about 0.7. It is advisable to set the oxygen in the cage to a higher level (2 or 3) for 15 to 20 minutes before placing your cat inside.

Should you decide to get an oxygen tank for home treatment and transport to your vet, you will need to purchase oxygen locally. Rent at least two tanks so that when one runs out, you have a backup canister if needed.

You can also ask the oxygen tank rental company if there are oxygen monitors available in your area.

If the tank is only used for a 1-hour car ride, you do not need to worry about humidifying the oxygen. However, if it will be used more frequently during the day, you must moisturize the oxygen to prevent irritation to your cat’s lungs and reduce the risk of respiratory infection.

Minimizing stress is one of the most important things you can do for a cat with CHF. I do not know your cat's personality, but if you find that being placed in the cage and not sitting on your lap during the car ride stresses her out, it may be better not to use the oxygen cage. If this is an issue, ask your vet about fitting an e-collar to your cat so you can administer oxygen during the car trip while she remains on your lap.

Reference

(1) Pouzot-Nevoret C, Hocine L, Allaouchiche B, Her J. Use of high-flow oxygen therapy in a cat with cardiogenic pulmonary edema. JFMS Open Rep. 2023 Oct 5;9(2):20551169231195767. doi: 10.1177/20551169231195767. PMID: 37810576; PMCID: PMC10559714. i.nlm.nih.gov/37810576/

This article is not meant to substitute for diagnosis, prognosis, treatment, prescription, or formal and individualized advice from your veterinarian. Animals exhibiting signs and symptoms of distress should be seen by a veterinarian immediately.

© 2023 Mark dos Anjos, DVM