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What is Rapid Heart Rate?

These valves separate oxygenated blood from un-oxygenated blood and complete the blood exchange through the body, but in order for the blood to move, the heart muscle needs to contract. The sinoatrial node is the electric impulse that triggers the heart to pump blood through each of the heart’s valves and chambers. The sinoatrial node or pacemaker, is what we feel as the cat’s heartbeat and can measure the number of times the electric impulse triggers the heart to pump over a minute’s time, giving us the feline’s general heart rate. The average heart rate for a feline is roughly 140-220 bpm (beats per minute), depending on the size of the cat, but complications with a feline’s sinoatrial node can make the heart beat over 240 bpm. A rapid heart rate in cats is a heart rate greater than 220 bpm and is known as tachycardia.

The heart of a cat is composed of four chambers; the right and left atria make up the top two chambers of the heart, while the right and left ventricles make up the bottom portion of the heart. In order to circulate the blood to each chamber and to the body, the heart has an assortment of valves that temporarily open to allow blood to pass through. The tricuspid valve is located between the right atrium and the right ventricle. The mitral valve is located between the left atrium and the left ventricle. The pulmonary valve is located between the right ventricle and the main pulmonary artery. Finally, the aortic valve is located between the left ventricle to the main artery of the body, the aorta.

Symptoms of Rapid Heart Rate in Cats

A cat with a rapid heart rate may have little to no present symptoms, as a rapid heart rate is a symptom in itself and not the definition of a disease. Congestive heart failure is the common cause of a rapid heart rate in cats, therefore, a feline may present disease-related symptoms, such as:

  • Cyanosis (blue discoloration of the mucous membranes)
  • Dyspnea (difficulty breathing) 
  • Cough

Additional symptoms a cat may display with a rapid heart rate may include: 

  • Heart murmur 
  • Weak pulse
  • Tachycardia (rapid heart rate) 
  • Sudden death
  • Exercise intolerance
  • Overall weakness
  • Syncope (fainting)

Causes of Rapid Heart Rate in Cats

There is a number of physiological and pathologic reasons a feline could develop a rapid heart rate. A cat could experience a temporarily elevated heart rate due to fear, excitement, rage, restraint, and exercise, but a prolonged rapid heart rate could be caused by a serious health condition including: 

  • Pancreatitis 
  • Cancer 
  • Heart tumor
  • Digitalis toxicity (heart medication poisoning) 
  • Myocarditis 
  • Gastric dilation
  • Chronic heart-valve disease
  • Cardiomyopathy 
  • Congenital heart defect
  • Anemia (low red blood cell count)
  • Shock
  • Thromboembolic disease 
  • Hypovolemia
  • Hypothyroidism
  • Metabolic disease
  • Pain
  • Fever
  • Stress

Diagnosis of Rapid Heart Rate in Cats

Diagnosis of a rapid heart rate in a cat can be completed simply through listening to the heart with a stethoscope, but to pinpoint the underlying cause for a cat’s heart to pump faster than it needs to, a thorough veterinary examination will be required. The veterinarian will need to take a look at your cat’s medical records, current medications, and past medical problems, as past complications could be linked the feline’s current health problem. Blood work is likely to be done in order to detect any abnormalities within the blood itself or the function of the body’s organs. 


An ECG or electrocardiogram is a non-invasive test that uses sensory attachments to detect the electric impulses produced by the heart. An ECG can determine the feline’s electrical activity and heart rhythm. 


Auscultation is the listening of heart sounds through the use of a stethoscope. This examination tool can help the veterinarian detect a heart murmur and arrhythmias (irregular heart beat). 

Radiography (x-ray)

A thoracic radiograph, or x-ray of the chest, can provide valuable information to assess a feline with a rapid heart rate. The veterinarian will be able to detect an enlarged portion of the heart, indicating one of the values is not working properly as blood is pooling into one heart chamber. Tumors that have grown within the heart tissues can also be detected on an x-ray and aid the doctor in proper treatment.

Treatment of Rapid Heart Rate in Cats

The treatment of a rapid heart rate in cats depends on the overall condition causing the heart to pump faster than it needs to. If the feline is unstable, he or she will need to be hospitalized until the cat is once again stable and the proper medications can be given. There is no treatment for a rapid heart rate in cats by itself.

Recovery of Rapid Heart Rate in Cats

If the overall cause of the cat’s rapid heart rate is determined to be a metabolic condition, the prognosis is generally good. However, heart disease, cancer, and congenital problems could worsen over time, increasing the chance for sudden death. The veterinarian will likely have your feline complete routine veterinary check-ups and may even have the feline wear a Holter monitoring device. The Holter monitor is a portable ECG that will monitor your cat’s heart rate over several hours.

Rapid Heart Rate Questions and Advice from Veterinary Professionals

1 Year
Critical condition
-1 found helpful
Critical condition

Has Symptoms

High sodium, seizures

My cat had a rapid heart rate and was jumping up walls and running furiously into walls. Vet said she was constipated and may have eaten something bad. She ended up dying with no real diagnosis and it's driving me crazy.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2985 Recommendations
When a loved one passes, it is normal to ask questions but it is not possible for me to say what the cause of death was without performing a necropsy; high sodium levels may be related but again I cannot comment, I wish I could offer some closure. Regards Dr Callum Turner DVM

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15 Years
Serious condition
0 found helpful
Serious condition

Has Symptoms

Loss Of Consciousness
Loss of Balance
Breathing Difficulty
Heavy Breathing
Loss of Appetite

My cat is 15 years old and a few years back was diagnosed with an overactive thyroid. She has always been quite skinny but is seeming a lot more bony these days. Just recently my cat seems to be showing signs of breathing difficulties such as heavy breathing, breathing with her mouth open and her chest moving back and forth when breathing. She is sleeping a lot and has also experienced epsiosdes where she loses all balance and seems very disoriented for a short time plus her head seems to shake. After taking her to the vets today I have been told there is nothing they can do as her heart muscles have grown inwards due to her overactive thyroid and she can barely breath without struggle when doing simple things such as walking. Ultimate they wanted to put her down but I have brought her home as I couldn’t make the decision as such haste. They only examined her breifly and checked her heart rate. I am obviously devastated so I’d like to make sure there is nothing else that can be done to help her even just have another year. Thank you

Dr. Michele King, DVM
Dr. Michele King, DVM
1402 Recommendations
Hyperthyroid disease is a progressive disease, and will affect the heart eventually. Without seeing Biscuit, I can't examine her or comment on her health, but your veterinarian has her best interest at heart, and not being able to breathe is not a good existence.

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2 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms


My cat has been coughing a lot, almost like he is trying to cough up a hairball. We took him to the vet today and they said it might be takycardia. I am so scared for my baby, what are the chabces that he will be okay?

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2985 Recommendations
Tachycardia (increased heart rate) is a symptom and not a diagnosis as such since there are many different causes for the heart rate to be increased; it is important to determine why the heart is beating fast which may be due to many different causes (electrical disturbances, infections, anaemia, fluid in the lungs just to name a few). A thorough examination which may include echocardiography (to check heart size, structure and function) would be useful in helping to narrow down a specific cause. Regards Dr Callum Turner DVM

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9 Months
Serious condition
0 found helpful
Serious condition

Has Symptoms

Not purring
Rapid Heartbeat
Low Energy
low appetit

My cat is lethargic and his heart is racing. He eats a little bit and plays slightly with our two younger kittens, but he seems overly sleepy. Also he's not feverish. The vets aren't open until Monday and we don't have an emergency animal clinic on my island. What can I do in the mean time? He has an existing injury, his left back leg was once dislocated and still hasn't full healed.

Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2985 Recommendations
An increase in heart rate and a reduction in movement may be attributable to pain from the previous injury, however without more information or examining him I cannot give you much constructive advice. Restrict movement and ensure that Toothless is eating, drinking, defecating and urinating, visit your Veterinarian when they open on Monday morning. Regards Dr Callum Turner DVM

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