Archive for the ‘Cats’ Category

What is HCM?

HCM is the most common heart disease in cats and stands for Hypertrophic Cardiomyopathy. Although it has occasionally been reported in dogs, this is very rare.

So what actually is it?

HCM describes a condition where the muscle wall of the heart becomes diseased. The walls grow additional layers of muscle, becoming stronger and stronger (which sounds like a good thing). However, this causes two problems – firstly, the space inside the heart (the lumen) is narrowed, meaning that the volume of blood that can be pumped out with each heartbeat is reduced. The second problem is that the thicker heart wall cannot relax properly – so the heart cannot fill effectively between beats. This means that the cat’s heart rate increases, to maintain their blood pressure – but of course, the harder the heart works, the stronger and thicker the muscle becomes.

What causes HCM?

There are three main causes:

  • Primary HCM occurs in an otherwise healthy cat. It is the most common form and is thought to be a genetic disease. In some high-risk breeds (Maine Coons and Ragdolls) the exact mutations have been discovered and there are DNA tests that can be carried out, but these aren’t available for most cats.
  • Secondary HCM is a response of the heart to another disease process. This may be:
    • Hyperthyroidism (an overactive thyroid), the most common secondary cause.
    • Hypertension (high blood pressure), usually in turn due to kidney failure.

What are the symptoms?

Most affected cats show no symptoms at all in the early stages of the disease. This is because even though the heart is becoming less efficient, the cat’s body can compensate for the disease, masking the symptoms. In this phase, one of our vets may hear a heart murmur when checking your cat over at vaccination, but there usually aren’t any other signs. However, the condition is progressive, and eventually, they won’t be able to mask it any longer. Some cats progressively develop subtle signs that gradually worsen, but many appear absolutely fine until they suddenly collapse, or even drop dead – this is known as an acute decompensation crisis.

There are two different clinical syndromes associated with HCM:

  • Congestive Heart Failure – where the heart can’t pump blood effectively enough, leading to pooling of fluid in the lungs and other organs. Typical symptoms usually appear in more-or-less the following order:
    • Heart murmur
    • Abnormal heart rate or rhythm
    • Increased time spent sleeping
    • Less time being active or playing
    • Increased breathing rate
    • Increased breathing effort
    • Pale or blue gums and cold extremities
    • Collapse or fainting
    • Open-mouth breathing
    • Sudden death
  • Thromboembolism – the failing heart isn’t pumping blood smoothly through its chambers, and as a result, blood clots start to form within the heart. At any stage, bits of these clots can break off and travel round the body. If they come to rest, they will grow and block an artery, and the symptoms will depend on where this occurs:
    • Stroke – where the blood clot blocks blood flow in the brain. Symptoms include fits, collapse, blindness and coma.
    • Pulmonary embolism – occurs in the lungs, resulting in very sudden onset difficulty breathing.
    • Aortic thromboembolism, also known as a saddle thrombus, is the most common form – it is one of the most common presenting symptoms of a cat with HCM. This occurs because a blood clot has cut off ALL circulation to one or both hind legs, causing extreme pain and paralysis, and is often fatal.

How is HCM diagnosed?
There are two ways the condition can be diagnosed; however, the DNA test is not one of them. This is because some cats who have the mutation don’t develop HCM, while many cats without it do.

A better “screening test” is the proBNP blood test – any cat with a raised proBNP level is likely to have some form of heart disease and needs further investigation.

The “gold standard” for diagnosis, however, is echocardiography, where a vet uses ultrasound to look inside your cat’s heart and measure how thick the wall is and how well their heart is working.

It’s important to remember, though, that just because a cat doesn’t have HCM, it doesn’t mean they’ll never develop the disease – it’s a condition that can develop at any age, and so cats in high-risk breeds should be regularly tested.

Is there any treatment?

Sadly, there is no cure for the genetic form of the disease. Affected cats should never be bred from, and if possible, all Maine Coon and Ragdoll cats should undergo DNA testing before they breed, in case they are carriers of the defective gene. Cats with Secondary HCM, however, can sometimes be returned to almost normal heart function if the underlying disease is detected and treated early enough.

In most cases, medical treatment is required. The mainstays of treatment are:

  • Slow down the heart rate – our vets may use drugs such as beta-blockers for this.
  • Help the heart relax between beats – a drug called diltiazem is licensed for this purpose in the UK.
  • Prevent clots from forming – using human drugs such as aspirin or clopidogrel at specific feline doses on prescription.
  • Reduce fluid buildup – ACE-inhbuilduprugs like benazepril and diuretics like frusemide are commonly used to reduce fluid pooling, helping the cat to breathe.

How long can a cat live with HCM?

The prognosis for cats with HCM is very variable – some cats may never develop clinical signs and will live normally for many years. Once symptoms appear, most cats survive less than two years; if the first symptom is a blood clot, the average survival time is only six months. As a result, the best prognosis is thought to be for cats diagnosed early, before symptoms appear!

If your cat is in an at-risk breed, or you are concerned about heart disease, make an appointment to get them checked out by one of our vets. If necessary, they can arrange blood testing or heart scans to see what’s actually going on!

What First Aid can I do for my cat? Part 3

In Part 1 and Part 2 we looked at how to approach an ill or injured cat; in this final part of the series, we will be talking about how to manage specific emergencies and conditions. Remember, this is first aid – it is intended to help you provide emergency care to your cat before you get them to us, not to replace proper treatment! 

What constitutes an emergency?

An emergency is any situation you find your cat in where their life or welfare is unexpectedly threatened. In more practical terms, we need to see them ASAP if…

  • They have open wounds or are unable to take weight on a leg.
  • They have lost consciousness (even if only for a short while) or have had a fit or a seizure.
  • They are collapsed or unable to stand.
  • They are struggling to breathe (in cats, this usually means they are breathing through their mouths or panting – this is deadly serious).
  • They seem to be in pain.
  • They are unable to pass urine or faeces.

Now, to finish off this series, we’ll briefly look at how to manage a range of different common situations, while you wait to get them in to see us.

Road traffic accidents (RTAs)

Cars moving at speed can cause a huge amount of damage to a cat’s body; however, cats are very good at getting out of the way and only then collapsing. This is why cats who have been hit by cars often manage to limp or crawl home, even if they have very serious injuries.

On assessing a cat after an RTA, it is quite likely that the full extent of their injuries won’t be apparent – internal bleeding, diaphragm ruptures and crush injuries can be hard to distinguish from “simple” shock. These cats should be handled and moved as little as possible and brought to us as rapidly as you can – please call ahead so we know you’re coming in and can get set up! Even if the injuries seem minor, we need to see them – some conditions (like lung bruises) seem fine until a few hours later, and can then rapidly become life-threatening without urgent treatment.

Cat fights

Cats are solitary hunters, and if they find a strange cat invading their hunting grounds, are likely to respond violently. Most cat fights result in superficial wounds and scratches, but if a tooth or claw goes deeper under the skin it can set up a “Cat Bite Abscess” which is really quite a nasty thing. Often, you won’t realise that they’ve been in a fight until a few days later when the abscess starts to grow. These aren’t usually life-threatening, but they do need to be seen by one of our vets for the best treatment (antibiotics, pain relief and often drainage of the pus). Make an appointment within the next day or so unless your cat is really sore or unwell in themselves; it is also helpful to bathe any wounds with warm salty water.

Eye injuries

These are most commonly due to cat fights – when quarrelling, cats don’t fight fair, instead, they slash with their claws at their adversary’s weak spots, like the eyes. This often results in “corneal lacerations”, slashes and cuts on the front of the eye. Often, the only symptom is a runny eye that the cat holds closed. These can usually be treated effectively, but eyes are fragile so need seeing as soon as possible.

Breathing difficulties

Open mouth breathing or panting is highly unusual in a cat and often suggests a serious respiratory problem (although it can also occur with diseases like cat-flu). Any difficulty breathing, or altered breathing rate is an emergency. Put the cat in a box, keep it quiet and calm, and get them to us ASAP.

Burns

Most burns are relatively superficial, but they’re really painful, so don’t get hurt yourself! The best treatment, in general, is to run cold water over the burn for at least 5 minutes, then get them to us for treatment. That said, if the burn is really large or deep (with obvious charring around the edges, for example) it may not be painful because the nerves have been burned away. If the burn seems moist or oozy, cover it with cling-film before cooling it (to reduce fluid loss) and then get them to us asap.

They’ve been exposed to something poisonous

Cats are sensitive to a wide range of different poisons, including many plants, most human medicines, and a number of household chemicals like cleaning agents, antifreeze and paint. If your cat is behaving abnormally or seems to be covered in some strange material, call us for advice straight away.

Fits or seizures

Fits are fairly uncommon in cats, and are usually due to poisoning, metabolic diseases (like diabetes mellitus), or injury to the brain (such as a stroke). While your cat is having a fit, it is best to leave them in a quiet, dark place to recover. They can’t “swallow their tongues” so don’t put your fingers in their mouth, don’t try to stroke them or talk to them (it can prolong the seizure), just let them recover. You can bring them in the be checked out once they’re over it. The exception is any seizure lasting more than a couple of minutes, or if they have multiple overlapping fits. These are medical emergencies that need seeing right now if we’re going to save their life.

If your cat is suddenly ill or injured, call us for advice!

What First Aid can I do for my cat? Part 2

In the first part of this blog, we talked about assessing the situation – making sure you aren’t at risk, and assessing the cat to see what you need to do then and there before rushing them in to see us. In this part, we’ll be looking at what you can do – how to resuscitate a cat, stopping bleeding, and transporting them safely to us. 

[Push], [Push], [Push], [Push], staying alive, staying alive… the art of feline CPCR 

CPCR (CardioPulmonary Cerebral Resuscitation) used to be called CPR, and if you want to use that term, feel free! Whatever you call it, it is essentially providing breathing and a heartbeat for a cat who is unable to do so on their own. Any cat who is so severely injured that they require CPCR is unlikely to survive – the TV programmes showing people miraculously reviving after a chest compressions are, sadly, very misleading. However, there are cases every year where rapid CPCR can genuinely save a cat’s life, so it’s always worth a try!

  • Breaths – for a cat who is not breathing on their own, and clearing their airway hasn’t solved the problem. You cannot do mouth-to-mouth with a cat, but you can do mouth-to-nose. Do be careful, however – if the cat wakes up suddenly (or is less unconscious than they appear) they may bite you! In addition, any cat with a nasal discharge or blood in their mouth may conceivably be carrying a disease that you could catch – it is unlikely, but not impossible. If you know the cat and are confident that they are healthy (except for whatever has just happened to them), then you can carry out “rescue breaths” mouth-to-nose, otherwise, use a “spacer” (like the styrofoam cup described below):
    • Form a seal over their nose – for the reasons given above, it’s probably best to use a styrofoam cup with the end knocked out rather than wrapping your lips around their nose, but that is an alternative.
    • Extend their head and neck so the neck is a straight as possible (avoid if they have obvious injuries to their head or neck).
    • Blow gently into their nose until you see the chest rise; then allow the air to flow out again. Ideally, you want to be giving roughly 20 breaths per minute.
  • Compressions – for a cat who has no heartbeat. Note, however, that a cat with severe bleeding may have such a weak heartbeat that you can’t feel it – in this case, stop the bleeding first!
    • Lie the cat on their right side (so their right legs are underneath) – if they seem to have suffered a spinal or head injury it is best to avoid moving them, and chest compressions can be done with them on their left side, but it isn’t as effective.
    • Place your hand around their chest, just behind the elbow, and squeeze the chest so it is compressed by about a third.
    • Repeat approximately 100 times a minute (yes, the song “staying alive” does work for cats!).
    • As you’re probably having to breathe for them as well, give two rescue breaths every 3-5 chest compressions.
  • Know when to stop – if the cat hasn’t made any response in 3 minutes, it’s time to stop. If their heart and breathing haven’t started on their own in this time, they aren’t coming back.

Stopping the Bleeding

If a major artery is cut, a cat can bleed to death in thirty seconds or so. However, most injuries affect smaller vessels and, give half a chance, the blood will clot and the bleeding will either stop or at least slow down enough to give you a chance to get the cat to us.

The key to stopping bleeding is pressure – but once again, make sure you aren’t injured by a miserable cat when you start pressing on a sore spot! It can help to have an assistant to hold the cat still while you try to stop the bleeding, but if not, you can use one hand to restrain them and one to work on them.

Ideally, try and apply a fairly tight pressure bandage – however, this may be difficult one-handed, and it’s important not to cut off circulation to the leg (see tourniquets, below).

If you can’t, or the wound is somewhere you can’t bandage (e.g. around the neck), then apply digital pressure with your fingers through a sterile dressing (if you have one!) or a clean cloth like a handkerchief.

If all else fails, it is possible to apply a tourniquet to a limb – a really tight bandage that will stop all blood-flow to the limb. A tourniquet can only stay on for about 15 minutes, though, or else the limb will die and become gangrenous, so do not try it unless you know how or we tell you to.

Bring them to us!

Although first aid is genuinely vital, it doesn’t usually save lives on its own – what it does is buy time to get the cat to us so we can work on them. However, transporting an ill or injured cat is something of an art form… The trouble is there’s no one single way to do it, it depends on what’s wrong with the cat. In general, however, try to follow these rules:

  • Do not transport cats loose, held or on your lap. However badly injured they are, they need to be transported in a box or basket, to stop them trying to escape en route.
  • Don’t move or bend cats with possible spinal injuries any more than necessary (e.g. weakness or paralysis or obvious injury to the spine or back). These cats should be gently “scooped” off the road or wherever using a rigid board (actually, a shovel is usually pretty good) and transported in whatever position they’re in.
  • If there is an open wound, an “Elizabethan” collar or “cone” is really useful to prevent them from making it worse.

In Part 3 we’ll talk about the management of specific types of injury or illness. If your cat is suddenly ill or injured, call us for advice!

What First Aid can I do for my cat? Part 1

It’s a nightmare scenario, and one that many cat owners don’t like to think about – you find your cat, bleeding, or injured, or otherwise in distress. What do you do? 

Most people who find themselves in this situation panic, and run around for a bit, and then rush their cat down to the vets. However, if you think about it in advance, and plan what you need to do, you can dramatically improve the chances of a good outcome (which can be defined as a happy pet going home with you at the end!). In addition, there are many situations where appropriate first aid at the time can genuinely save lives.

This is the first in a series of three blogs where we’re going to look at first aid in cats. In Part 1, we’ll look at assessing the situation, and how you can respond appropriately. In Part 2 we’ll talk about what you can right away to maximise their chances of survival, and then in Part 3, we’ll look at some of the more common diseases and conditions that you’ll need to know how to deal with.

First of all, assess the situation!
The primary and vital rule of first aid is do not put yourself in danger. If you become a casualty, you aren’t helping your pet (and you are potentially putting others in danger as they try to rescue you). Of course, what constitutes danger will depend on the situation, but the most common ways people put themselves at risk when trying to help cats include:

  • Traffic – running out into traffic because a cat’s been hit isn’t helpful to anyone, as there’s a good chance you’ll be injured! It is better to stop or block the traffic or call the police to do so, before moving into a busy road.
  • Water – cats can, in fact, swim really quite well (although most prefer not to!). If your cat is in difficulty in deep water, don’t jump in yourself, but instead try to fish them out with a net, or a branch, or a floating object that they can cling on to.
  • Fire – do not run into a burning building to rescue your cat. Instead, tell the Fire Brigade that the cat is in there, and allow them to make the rescue. Many fire appliances now carry cat-sized oxygen masks to allow the firefighters to help as well.
  • Electricity – cats do periodically become entangled in electrical wires. If inside the house, if possible make sure that the current is off (for example, by flipping the trip switch or pulling the fuse). If you can’t get to the fuses or the power switch (or either look like they may be unsafe), use a dry, non-conducting object (such as a wooden broomstick – nothing metal!) to untangle them and push the electrical cables away from them. If it is outdoors and is a mains cable (e.g. overhead wires) do NOT approach – call the police and the electrical company immediately.
  • The cats themselves – frightened and painful cats often bite and scratch – it isn’t that they want to hurt you, but they can’t help it when they’re scared or hurting. So make sure you’re not injured while trying to help!

Once you have managed to safely reach the injured puss, your next task is to assess their situation. Are they breathing? Is there severe bleeding? What’s going on? At this point, it is often helpful to call us – one of our vets or nurses will be able to walk you through what you need to do over the phone and can prepare to meet you at the surgery.

The first part of your assessment is the primary survey – this is intended to check whether the cat is at imminent risk of death.

  1. Are they responsive? Are they aware of their surroundings, and (at least semi-) conscious? If yes, move to point 3.
  2. If not, then (just like human first-aiders), we use the “ABC” model to try and work out why:
    1. Airway – can the cat move air? If in doubt, try to extend the head and neck and gently pull the tongue out of their mouth. If there’s anything in the mouth, try and hoick it out (without getting bitten).
    2. Breathing – is the cat breathing? The best way to check this is to hold a clump of fluff in front of their nose and see if it moves. If not, you may need to start CPCR (see Part 2).
    3. Circulation – is the cat’s heart beating? You can check this by feeling behind the elbow on their left-hand side. If not, you will need to carry out CPCR.
  3. Are there any other life-threatening injuries? We’re not generally talking about broken bones here (they’re painful but unlikely to be fatal as long as you’re careful). However, severe bleeding, head trauma, and damage to the chest are all potentially lethal. Of these, the only one you can do anything about in the first aid situation is bleeding – you’ll need to try and stop it, or at least slow it down, and then rush them to us for definitive treatment.

In Part 2 we’ll look at what you can do for your cat in an emergency situation. If your cat is suddenly ill or injured, call us for advice!

Can cats get heart disease?

Many people now are well aware that dogs can get heart disease – heart failure in breeds such as Cavalier King Charles Spaniels, Dobermans or Wolfhounds is fairly well recognised. However, most people aren’t aware that cats can suffer too – because, sadly, yes, cats can and do get heart problems.

What can cause it?

Like any animal, cats can suffer congenital heart problems, where the heart doesn’t form properly in the developing kitten. This is quite rare but is seen occasionally.

The most common heart disease in cats is called hypertrophic cardiomyopathy or HCM; this is a condition where the heart muscle becomes too thick and strong. Now that may sound great, having a nice strong heart – however, in HCM the heart is so thick that the space for the blood becomes narrowed, meaning the pumping action is actually weakened.

In some cats, HCM is caused by a genetic mutation (there is a defect in the gene controlling the muscle thickness, causing double or triple thickness muscle walls to gradually develop over time). This is most common in large breeds such as Maine Coons. In most cats, however, HCM occurs secondary to hyperthyroidism (an overactive thyroid gland). This hormonal condition causes the cat’s heart to overgrow, leading to HCM.

Other causes of heart disease (such as leaking valves, or narrowed arteries) can occur but are fairly uncommon.

What are the symptoms of heart disease in cats?

Unfortunately, most cats show very few symptoms until the condition is very advanced. Typical early signs include intermittent shortness of breath and reduced ability to exercise – but in most cats, these symptoms aren’t easy to recognise, as they are pretty subtle.

As the disease progresses, the cat may go into congestive heart failure, where the heart’s ability to pump is significantly impaired, leading to fluid accumulation. The symptoms include shortness of breath, coughing, and swelling of the abdomen and (occasionally) paws or face. However, most cats manage to hide these signs until they suffer a decompensation crisis where they can no longer cope with the fluid building up in their lungs. This usually presents with sudden onset difficulty in breathing – typically, gasping for air with an open mouth, looking terrified and severely stressed. Cats in this condition need to see one of our vets right away, at any hour if the day or night, as they would soon die without treatment.

Another common sign of advanced heart disease is the development of blood clots – typically a saddle thrombus, where a clot blocks off blood flow to the back legs. This is due to abnormal blood flow in the heart, triggering excessive clotting of the blood, and leads to paralysis of the affected leg or legs, severe pain, often with cold legs, and no detectable pulses. If not treated this is fatal, and sadly, even with treatment, many cats will not recover.

How is heart disease diagnosed?

Our vets can use a wide range of different techniques to diagnose heart disease in cats. A simple physical examination, especially auscultation (listening to the chest with a stethoscope) can often be revealing, but nice loud heart murmurs are rarer than in dogs. X-rays are very useful to assess the state of the heart and lungs but aren’t always suitable for very sick cats.

The most useful single technique is echocardiography, where an ultrasound machine is used to examine the size and shape of the heart and its chambers. Our machines can also be used to detect abnormal blood flow through the heart, and even to quickly assess the lungs of a critically ill cat for fluid build-up.

So what can be done about it?

Fortunately, there are a range of medical treatments available now. Diuretics (“water tablets”) are very important in reducing fluid accumulation; and there are a range of drugs for managing congestive heart failure. Anticoagulants (“blood thinners”) are also invaluable in treating and preventing blood clots from forming.

Unfortunately, most heart diseases cannot be cured yet, but we can usually improve your cat’s quality of life and lifespan if the condition is detected early.

If you think your cat may have a heart or breathing problem, make an appointment to see one of our vets as soon as possible.