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Reverse sneezing, also known as inspiratory paroxysmal respiration, is a clinical event that occurs in dogs and cats. It is possibly caused by a muscle spasm at the back of the animal's mouth, more specifically where the muscle and throat meet. [1] Other hypotheses state that it occurs when the animal's soft palate gets irritated. The irritation causes spasms in the soft palate muscle thus narrowing the trachea. Because the trachea is narrowed, the pet isn't able to inhale a full breath of air, resulting in forceful attempts to inhale through their nose. This causes the pet to experience reverse sneezing. [2]
The clinical symptoms seem to occur more in brachycephalic dog breeds such as Pugs, Brussels Griffons, Boxer, English- and French bulldogs. The specific cause of reverse sneezing is unknown but there could be a link between nasal, pharyngeal or sinus irritation which increases the production of mucus. In attempt to remove this excess mucus, reverse sneezing can be observed. Another hypothesis is based on the overexcitement of the pet which might cause reverse sneezing. [3] Reverse sneezing might also be caused by a previous diagnosis such as tracheal collapse. [3] It can also be a sign of an asthma attack in pets.
During an episode of reverse sneezing, symptoms such as sudden, involuntary respiratory reflex can be noted. As a response to reverse sneezing, the air is sucked in through the nose in a series of rapid and forceful inhalations. [1] An episode of reverse sneezing usually lasts for 30 seconds or less although it might feel longer for the owner. [2] For reverse sneezing, there are no confirmed treatments yet to be found, but there are some commonly used remedies. It’s recommended to have a veterinarian examine your pet regardless of severity.
Reverse sneezing oftentimes occurs when the pet is asleep or immediately after a long nap. It can also be experienced following play, exercise or meals. Other pets experience it whilst inhaling dust but the episodes of reverse sneezing typically occur randomly. The pet's size does not have a direct impact on reverse sneezing. However, smaller breeds have shown to be more susceptible to reverse sneezing. In addition, research shows that brachycephalic dogs and cats are more prone to develop reverse sneezing than other dog or cat breeds.
Reverse sneezing is characterized by rapid and long inhalations, extending from the head and neck. In most cases, the pet stands still during an episode. A snorting or gagging sound can be observed as a result of a pet inhaling their sneezes.
The pet undergoes reverse sneezing to expel an irritating agent. Normally, a regular sneeze helps by expelling the irritating agent in the nasal cavity. Coughing will make the irritating agent move further down in the trachea. Reverse sneezing is a way of the pet's body to expel an irritating agent slightly further down at the nasopharynx or the area near the soft palate. Some examples of possible causes of irritation that result in reverse sneezing include: allergies, nasal mites, exercise intolerance and elongated soft palate. An elongated soft palate mostly occurs in dogs or cats of brachycephalic breeds. [2]
A pet that experiences reverse sneezing, appears to be normal after an episode of reverse sneezing. Most pets who are prone to developing the condition will experience reverse sneezing repeatedly throughout their lives. The reverse sneezing might be distressing for the animal but it is not known to be harmful.
It is common for reverse sneezing to be a symptom of another condition or diagnosis, meaning reverse sneezing might lead to the discovery of an underlying condition. A pet which was diagnosed with nasal eucoleosis was experiencing symptoms of reverse sneezing amongst other clinical symptoms. [4]
The treatment of reverse sneezing does not specifically require medication. Studies have proven that medication such as antihistamines and steroids may be effective if the reverse sneezing is serious, chronic or allergy-related. In case of chronic episodes or other respiratory issues, a clinical diagnosis made by a veterinarian is recommended. [1] In severe cases of reverse sneezing, rhinoscopy can be used to determine possible causes for the reverse sneezing. [2]
Although a great deal of research has been done in order to determine the clinical cause of reverse sneezing, any specific origin for reverse sneezing has yet been found. [1] [2] [3] [4]
The uvula, also known as the palatine uvula or staphyle, is a conic projection from the back edge of the middle of the soft palate, composed of connective tissue containing a number of racemose glands, and some muscular fibers. It also contains many serous glands, which produce thin saliva. It is only found in humans.
A cough is a sudden expulsion of air through the large breathing passages which can help clear them of fluids, irritants, foreign particles and microbes. As a protective reflex, coughing can be repetitive with the cough reflex following three phases: an inhalation, a forced exhalation against a closed glottis, and a violent release of air from the lungs following opening of the glottis, usually accompanied by a distinctive sound.
A hiatal hernia or hiatus hernia is a type of hernia in which abdominal organs slip through the diaphragm into the middle compartment of the chest. This may result in gastroesophageal reflux disease (GERD) or laryngopharyngeal reflux (LPR) with symptoms such as a taste of acid in the back of the mouth or heartburn. Other symptoms may include trouble swallowing and chest pains. Complications may include iron deficiency anemia, volvulus, or bowel obstruction.
A sneeze is a semi-autonomous, convulsive expulsion of air from the lungs through the nose and mouth, usually caused by foreign particles irritating the nasal mucosa. A sneeze expels air forcibly from the mouth and nose in an explosive, spasmodic involuntary action. This action allows for mucus to escape through the nasal cavity and saliva to escape from the oral cavity. Sneezing is possibly linked to sudden exposure to bright light, sudden change (drop) in temperature, breeze of cold air, a particularly full stomach, exposure to allergens, or viral infection. Because sneezes can spread disease through infectious aerosol droplets, it is recommended to cover one's mouth and nose with the forearm, the inside of the elbow, a tissue or a handkerchief while sneezing. In addition to covering the mouth, looking down is also recommended to change the direction of the droplets spread and avoid high concentration in the human breathing heights.
Irritation, in biology and physiology, is a state of inflammation or painful reaction to allergy or cell-lining damage. A stimulus or agent which induces the state of irritation is an irritant. Irritants are typically thought of as chemical agents but mechanical, thermal (heat), and radiative stimuli can also be irritants. Irritation also has non-clinical usages referring to bothersome physical or psychological pain or discomfort.
Rhinitis, also known as coryza, is irritation and inflammation of the mucous membrane inside the nose. Common symptoms are a stuffy nose, runny nose, sneezing, and post-nasal drip.
Rhinorrhea, also spelled rhinorrhoea or rhinorrhœa, or informally runny nose is the free discharge of a thin mucus fluid from the nose; it is a common condition. It is a common symptom of allergies or certain viral infections, such as the common cold or COVID-19. It can be a side effect of crying, exposure to cold temperatures, cocaine abuse, or drug withdrawal, such as from methadone or other opioids. Treatment for rhinorrhea may be aimed at reducing symptoms or treating underlying causes. Rhinorrhea usually resolves without intervention, but may require treatment by a doctor if symptoms last more than 10 days or if symptoms are the result of foreign bodies in the nose.
Entropion is a medical condition in which the eyelid folds inward. It is very uncomfortable, as the eyelashes continuously rub against the cornea causing irritation. Entropion is usually caused by genetic factors. This is different from when an extra fold of skin on the lower eyelid causes lashes to turn in towards the eye (epiblepharon). In epiblepharons, the eyelid margin itself is in the correct position, but the extra fold of skin causes the lashes to be misdirected. Entropion can also create secondary pain of the eye. The upper or lower eyelid can be involved, and one or both eyes may be affected. When entropion occurs in both eyes, this is known as "bilateral entropion". Repeated cases of trachoma infection may cause scarring of the inner eyelid, which may cause entropion. In human cases, this condition is most common to people over 60 years of age.
Pneumonia is an irritation of the lungs caused by different sources. It is characterized by an inflammation of the deep lung tissues and the bronchi. Pneumonia can be acute or chronic. This life-threatening illness is more common in cats than in dogs and the complication “Kennel Cough” can occur in young pets.
Laryngospasm is an uncontrolled or involuntary muscular contraction (spasm) of the vocal folds. It may be triggered when the vocal cords or the area of the trachea below the vocal folds detects the entry of water, mucus, blood, or other substance. It may be associated with stridor or retractions.
Feline asthma is a common allergic respiratory disease in cats, affecting at least one percent of all adult cats worldwide. It is a chronic progressive disease for which there is no cure. Common symptoms include wheezing, coughing, labored breathing and potentially life-threatening bronchoconstriction. There is conjecture that the disease has become more common due to increased exposure to industrial pollutants. Feline asthma can also be attributed to lung damage caused by long-term exposure to second-hand smoke.
Allergies to cats, a type of animal allergy, are one of the most common allergies experienced by humans. Among the eight known cat allergens, the most prominent allergen is secretoglobin Fel d 1, which is produced in the anal glands, salivary glands, and, mainly, in sebaceous glands of cats, and is ubiquitous in the United States, even in households without cats. The second most common is Fel d 2, this type is triggered by the cats dead skin flakes (dander) that are floating in the air as well as in the smell of cat urine.
A sniffle is the instinctive action of inhaling quickly in order to prevent mucus from flowing from one's nasal cavity, as an alternative to blowing the nose.
Vocal cord dysfunction (VCD) is a condition affecting the vocal cords. It is characterized by abnormal closure of the vocal folds, which can result in significant difficulties and distress during breathing, particularly during inhalation.
Dogs are susceptible to allergies much like their human companions. Most allergies occur in dogs over 6 months old. A dog that is repeatedly exposed to a particular allergen becomes sensitized to it, and the immune system overreacts to a subsequent exposure, most commonly manifesting in the form of skin irritation. Some of the signs are redness, itching, hair loss, and recurring skin infections from the irritation. The dog may be more prone to scratching and licking at the irritated site, further exacerbating the problem.
The laryngeal saccules are soft tissue masses that are extensions of the laryngeal ventricles in the larynx. Their function is not well understood, but they may lubricate the vocal cords, and increase the resonance of vocalisation. They may be involved in airway disease and airway obstruction. They may be surgically removed using a laryngeal sacculectomy.
Throat irritation can refer to a dry cough, a scratchy feeling at the back of the throat, a sensation of a lumpy feeling, something stuck at the back of the throat, or possibly a feeling of dust in the throat. The symptoms are unpleasant and usually temporary, but occasionally signifies a more serious health issue, such as laryngitis.
Brachycephalic obstructive airway syndrome (BOAS), also known as brachycephalic airway obstructive syndrome (BAOS), brachycephalic airway syndrome (BAS), and brachycephalic syndrome (BS), is a pathological condition affecting short nosed dogs and cats which can lead to severe respiratory distress. There are four different anatomical abnormalities that contribute to the disease, all of which occur more commonly in brachycephalic breeds: an elongated soft palate, stenotic nares, a hypoplastic trachea, and everted laryngeal saccules. Because all of these components make it more difficult to breathe in situations of exercise, stress, or heat, an animal with these abnormalities may be unable to take deep or fast enough breaths to blow off carbon dioxide. This leads to distress and further increases respiratory rate and heart rate, creating a vicious cycle that can quickly lead to a life-threatening situation.
An elongated soft palate is a congenital hereditary disorder that negatively affect dogs and cats' breathing and eating. A soft palate is considered elongated when it extends past the top of the epiglottis and/or past the middle of the tonsillar crypts. The soft palate is made up of muscle and connective tissue located in the posterior portion on the roof of the mouth. The soft palate creates a barrier between the mouth and nose. This continuation between the cavities makes it possible to chew and breathe at the same time. The soft palate only blocks the nasal cavity while swallowing. At rest the soft palate should only stretch caudally from the hard palate to the tip of the epiglottis leaving an opening between the nasal and oral cavities. When the soft palate is elongated, it partially blocks the throat thereby creating breathing and feeding-related issues. The elongation and other accompanying symptoms occur in breeds characterized with “smooshed faces” such as pugs, bulldogs, and Persian cats. This condition is a congenital, meaning it is present when the animal is born. The “smooshed” characteristics is the result of a genetic mutation. The animal’s genetic code causes the bones in their skull to grow to a smaller size. Because the bones are smaller, muscles and other tissues that surround the bones of the skull are out of proportion. These animals are often referred to as brachycephalic, derived from the Greek words for “short” and “head”. An elongated soft palate is a symptom of Brachycephalic Obstructive Airway Syndrome (BOAS) and is common in brachycephalic dog breeds and has been reported in brachycephalic cat breeds as well. Some of the other BOAS related symptoms include stenotic nares, everted laryngeal saccules, and laryngeal collapse.