Tracheal Collapse

Tracheal collapse is a respiratory condition affecting farm animals characterized by weakening and flattening of the tracheal rings, leading to narrowing or complete obstruction of the airway during breathing. The trachea, commonly known as the windpipe, consists of C-shaped cartilage rings connected by a flexible dorsal membrane that together maintain airway patency during the pressure changes of respiration. When these cartilage rings lose their structural integrity, they can flatten during inspiration or expiration, compromising airflow and causing characteristic respiratory signs. In farm animals, tracheal collapse may occur as a congenital defect, develop secondary to external trauma, or result from infectious or inflammatory conditions affecting tracheal structures.

Tracheal collapse affects various farm animal species with differing presentations and underlying causes. Poultry, particularly rapidly growing broilers and turkeys, are notably susceptible to tracheal problems including collapse associated with infectious laryngotracheitis, Aspergillus infections, and nutritional deficiencies. Cattle may develop tracheal collapse following external trauma to the neck region, as a complication of prolonged intubation during anesthesia, or secondary to tracheal tumors. Small ruminants including sheep and goats occasionally experience tracheal collapse related to improper restraint techniques involving excessive neck pressure or following severe respiratory infections. Pigs may develop tracheal abnormalities as part of broader respiratory disease complexes affecting the upper airways.

The economic and welfare impact of tracheal collapse in farm animals depends largely on the severity and cause of the condition. Mild cases may cause minimal production impact while still compromising animal comfort and welfare through chronic respiratory difficulty. Moderate to severe cases typically result in reduced feed efficiency, decreased growth rates, and exercise intolerance that limits normal activities and social interactions. In breeding animals, respiratory compromise may reduce reproductive performance. Severely affected animals may become non-viable production animals, representing direct economic losses. The condition also causes significant suffering through dyspnea, anxiety associated with breathing difficulty, and reduced quality of life.

Treatability of tracheal collapse in farm animals varies with the underlying cause and severity of structural damage. Cases resulting from reversible inflammation or infection may resolve with appropriate medical management addressing the primary cause. Traumatic cases may heal if the damage is not too severe and appropriate supportive care is provided. However, permanent cartilage damage results in irreversible collapse that can only be managed rather than cured. Surgical intervention, including stent placement, is rarely practical in production farm animals due to cost and technical challenges. Early detection of predisposing factors and prompt treatment of conditions that could damage tracheal structures offers the best opportunity for preventing progression to severe, irreversible collapse.

Primary causes of tracheal collapse in farm animals include congenital cartilage abnormalities, infectious diseases, external trauma, and degenerative changes. Congenital tracheal hypoplasia, characterized by abnormally small or malformed tracheal rings present from birth, predisposes animals to collapse even under normal respiratory pressures. Infectious agents including bacteria, viruses, and fungi can damage tracheal cartilage and supporting tissues directly or through the inflammatory response they provoke. Infectious laryngotracheitis virus in poultry causes severe tracheal inflammation that can result in permanent structural damage. External trauma from improper restraint, collars or chains too tight around the neck, or accidental injury may crush or fracture tracheal cartilage.

Genetic and breed predispositions to tracheal collapse are recognized in some livestock populations, though not as well characterized as in companion animal species. Rapidly growing poultry breeds selected for maximum growth rates may have disproportionate development of body mass relative to respiratory structures, placing increased demands on the trachea. Certain breeding lines within species may carry genetic factors affecting cartilage development or strength. Animals with congenital tracheal abnormalities should not be used for breeding to avoid propagating defective genetics. However, the heritability of tracheal collapse susceptibility in most farm animal species remains poorly defined and requires further research.

Environmental and management factors significantly influence tracheal collapse risk through various mechanisms. Chronic exposure to respiratory irritants including ammonia, dust, and smoke causes ongoing tracheal inflammation that may weaken cartilage over time. Poor air quality in enclosed housing, particularly in poultry and swine operations, contributes to upper respiratory damage. Improper handling and restraint techniques that place excessive pressure on the neck area can cause acute or cumulative trauma to tracheal structures. Housing equipment including neck rails in dairy facilities or improperly fitted collars may create chronic pressure on the trachea. Climate extremes requiring increased respiratory effort can exacerbate underlying tracheal weakness.

Risk factors for tracheal collapse development include young age during critical developmental periods, respiratory infections at any age, obesity, and concurrent conditions affecting respiratory function. Young animals with developing cartilage are more susceptible to permanent damage from trauma or infection. Obese animals have increased respiratory demands and may have fat deposition around the neck affecting airway function. Animals with pre-existing respiratory disease may develop chronic coughing that places repeated stress on tracheal structures. Recovery from severe respiratory infections may leave residual tracheal damage. Repeated or prolonged intubation for surgical procedures can cause tracheal injury leading to subsequent collapse.

The pathophysiology of tracheal collapse involves loss of cartilage rigidity that normally maintains tracheal lumen patency during breathing. Normal tracheal cartilage contains a matrix of glycosaminoglycans and collagen that provides both flexibility and structural support. Damage to chondrocytes, the cells maintaining cartilage, or degradation of the cartilage matrix leads to weakening and loss of shape. During inspiration, negative intraluminal pressure can cause weakened tracheal walls to collapse inward, restricting airflow. During forced expiration or coughing, positive intrathoracic pressure can cause the intrathoracic portion of the trachea to collapse. The dorsal membrane may become lax and bulge into the lumen, further compromising airway diameter. Chronic changes include cartilage degeneration, fibrosis, and inflammation that progressively worsen the condition.

Early warning signs of tracheal collapse in farm animals are often subtle and may be attributed to other causes without careful evaluation. Initial symptoms typically include mild exercise intolerance, with affected animals becoming winded more easily than herd or flock mates during normal activities. A slight increase in respiratory rate or effort may be noticeable, particularly after exertion. Some animals develop an occasional cough, often described as honking or dry in character, that occurs with excitement or exercise. Changes in vocalization, including weak or altered sounds, may occur as the abnormal trachea affects air movement. Careful observation during daily activities reveals these early indicators of developing airway compromise.

Common symptoms by species reflect differences in anatomy, typical causes, and management systems. In cattle, tracheal collapse commonly presents with inspiratory stridor, a harsh breathing sound during inhalation, along with extended neck posture as the animal attempts to straighten and open the airway. Sheep and goats may show exercise intolerance, coughing, and respiratory distress during handling or stress. Poultry with tracheal collapse or related upper airway compromise display gasping, open-mouth breathing, and distinctive respiratory sounds variously described as chirping, squeaking, or gurgling. Affected birds often extend their necks and appear to struggle for breath. Pigs may show abnormal respiratory sounds and reduced tolerance for exercise or thermal stress.

Behavioral changes associated with tracheal collapse reflect the respiratory compromise and associated distress. Affected animals typically show reduced activity levels and avoid exertion that exacerbates breathing difficulty. Feed intake may decrease as respiratory effort takes priority, particularly in severe cases. Animals often position themselves to maximize airway patency, including standing with extended necks and widespread forelegs. Heat intolerance becomes pronounced, with affected animals seeking cool areas and becoming distressed in warm conditions. Social interactions may decrease as animals conserve energy and avoid activities that trigger respiratory symptoms.

Physical signs of tracheal collapse become more apparent as the condition progresses or during episodes of acute deterioration. The characteristic cough is often honking or goose-like in cattle and small ruminants, triggered by excitement, eating, drinking, or pressure on the neck area. Respiratory sounds during breathing range from mild wheezing to pronounced stridor audible without a stethoscope. Cyanosis, a bluish discoloration of mucous membranes indicating inadequate oxygenation, may occur during severe episodes or exertion. In some cases, external observation of the neck area may reveal visible collapse of the trachea during breathing. Chronic cases may develop secondary changes including barrel-chested conformation from chronic respiratory effort.

Symptom progression in untreated or progressive tracheal collapse follows a pattern of increasing respiratory compromise. Initial mild exercise intolerance and occasional cough give way to more frequent symptoms triggered by less intense stimuli. Resting respiratory rate may increase as the animal compensates for reduced airway diameter. Episodes of severe respiratory distress become more frequent and intense. Weight loss occurs from the combined effects of reduced feed intake and increased energy expenditure for breathing. Affected animals become progressively debilitated and may develop secondary complications including aspiration pneumonia from impaired swallowing coordination.

Emergency symptoms requiring immediate veterinary intervention include severe respiratory distress, cyanosis, collapse, and complete airway obstruction. Animals in acute crisis display extreme anxiety, pronounced respiratory effort with abdominal press, open-mouth breathing, and foam or excessive saliva at the mouth. Complete tracheal collapse can occur suddenly, particularly following excitement, exertion, or exposure to heat, creating a life-threatening emergency. Affected animals may lose consciousness from hypoxia within minutes if airflow is not restored. These emergencies require immediate veterinary attention including potential emergency tracheostomy to bypass the collapsed segment and restore breathing.

Clinical examination for suspected tracheal collapse begins with observation of the animal's respiratory pattern, posture, and effort at rest and during mild exertion. The veterinarian evaluates respiratory rate, depth, and character of breath sounds using a stethoscope placed over the trachea and lung fields. Palpation of the trachea along its accessible cervical portion assesses for structural abnormalities, pain, masses, or external compression. Inducing coughing by gentle tracheal pressure may elicit characteristic sounds suggestive of collapse. Assessment of mucous membrane color indicates oxygenation status. Complete physical examination identifies concurrent conditions affecting respiratory function and guides differential diagnosis.

Diagnostic tests for tracheal collapse provide definitive information about the location, severity, and cause of airway compromise. Radiography of the cervical and thoracic regions captures images of the trachea during different respiratory phases to demonstrate dynamic collapse. Inspiratory and expiratory views are essential as collapse may only be apparent during one phase of breathing. Fluoroscopy, when available, enables real-time visualization of tracheal dynamics during normal breathing and coughing. Endoscopy, using a flexible bronchoscope or tracheoscope, allows direct visualization of the tracheal lumen, assessment of collapse severity, and identification of concurrent conditions including inflammation, masses, or foreign bodies. In poultry, postmortem examination often provides the most practical diagnostic approach.

Differential diagnosis for tracheal collapse includes various conditions causing similar respiratory signs. Tracheal foreign bodies may cause acute respiratory obstruction resembling collapse. Tracheal masses, including tumors, granulomas, and abscesses, can obstruct the airway. External compression from enlarged lymph nodes, thyroid masses, or other neck structures may mimic collapse symptoms. Laryngeal paralysis or masses affect the upper airway with overlapping signs. Chronic bronchitis and lower airway disease can cause coughing and respiratory distress. Infectious respiratory diseases may damage the trachea directly or cause signs similar to collapse. Careful diagnostic evaluation distinguishes among these possibilities.

Herd-level diagnostics become relevant when multiple animals show respiratory signs potentially related to tracheal problems. Environmental assessment evaluates air quality factors including ammonia levels, dust, humidity, and temperature that may contribute to respiratory disease. Management practice review identifies handling techniques or equipment that could cause tracheal trauma. Investigation of feed quality and nutritional status addresses potential deficiencies affecting cartilage development and maintenance. In poultry operations experiencing tracheal disease outbreaks, diagnostic testing for infectious laryngotracheitis and other respiratory pathogens is essential. Mortality examination of affected birds provides valuable diagnostic information about tracheal pathology and causative factors.

Emergency treatment of acute tracheal collapse with severe respiratory distress requires immediate intervention to restore adequate breathing. The animal should be kept as calm as possible since excitement worsens respiratory compromise, using gentle handling and minimizing stimulation. Supplemental oxygen can be provided if available and tolerated. Corticosteroids may be administered to reduce inflammation and airway swelling. Sedation with appropriate agents can reduce anxiety and oxygen demand while avoiding respiratory depression. In life-threatening cases where the animal cannot maintain adequate breathing, emergency tracheostomy below the level of collapse creates an alternate airway bypassing the obstruction. This requires immediate veterinary intervention with appropriate equipment and expertise.

Medical management of tracheal collapse focuses on reducing inflammation, controlling cough, and addressing underlying or concurrent conditions. Anti-inflammatory medications, including corticosteroids for acute management and non-steroidal anti-inflammatory drugs for longer-term control, reduce airway edema and inflammation. Cough suppressants may provide relief in cases where frequent coughing worsens the condition, though coughing also serves protective functions that should not be completely eliminated. Bronchodilators can help if lower airway component exists. Antibiotics address secondary bacterial infections that commonly develop in compromised airways. Treatment of any identified underlying cause, such as specific therapy for infectious laryngotracheitis in poultry, is essential for optimal outcomes.

Surgical options for tracheal collapse in farm animals are limited compared to companion animal medicine due to economic and practical constraints. Tracheal stent placement, commonly performed in small animal patients, is rarely practical in large livestock due to cost, technical challenges, and limited stent availability for larger tracheal diameters. Tracheal ring prostheses have been attempted experimentally but are not standard treatments. Surgical reconstruction techniques may be considered in valuable individual animals if the collapsed segment is localized and accessible. Permanent tracheostomy, creation of a surgically maintained opening in the trachea, provides an alternate airway in chronic severe cases but requires ongoing management and has significant complications. For most farm animal patients, surgical intervention beyond emergency tracheostomy is not economically justified.

Supportive care plays an important role in managing tracheal collapse cases. Weight management addresses obesity that increases respiratory demands, with appropriate dietary modification to achieve healthy body condition. Environmental modifications reduce exposure to respiratory irritants including dust, ammonia, and extreme temperatures. Housing should be well-ventilated while avoiding drafts that could trigger increased respiratory effort. Exercise restriction appropriate to severity prevents episodes of acute respiratory distress. Ensuring access to soft, easily consumed feed and water reduces triggers from eating and drinking. Stress reduction through calm handling and stable social environments minimizes respiratory demands.

Herd management protocols address tracheal collapse when it occurs as a recurring problem within a population. Investigation of causative factors identifies management issues contributing to tracheal damage. Correction of handling techniques that may cause trauma, improvement of air quality, and optimization of nutrition for cartilage health form prevention-focused interventions. Animals with confirmed tracheal collapse should be clearly identified to ensure appropriate handling and monitoring. Affected animals should not be used for breeding if a genetic component is suspected. Development of criteria for culling versus continued management guides economic decision-making.

Treatment decisions for tracheal collapse must balance animal welfare with economic realities of farm animal production. Mildly affected animals may continue productive lives with environmental modification and occasional medical management. Moderately affected animals require ongoing investment in management and treatment that may or may not be economically justified depending on individual value. Severely affected animals experiencing frequent respiratory crises face a poor quality of life that may warrant humane euthanasia regardless of economic considerations. For animals retained for treatment or management, proper documentation of any drug administration ensures food safety compliance through appropriate withdrawal time observance.

Recovery timeline for tracheal collapse depends heavily on the underlying cause and extent of structural damage to the trachea. Cases secondary to reversible causes such as inflammation from respiratory infection may show significant improvement within one to three weeks as the primary condition resolves. Traumatic cases with mild cartilage damage may heal over several weeks if appropriate rest and supportive care are provided. However, cases involving permanent cartilage degeneration or severe structural damage do not truly recover in the sense of returning to normal tracheal function. These animals can only be managed to maintain the best possible quality of life and function within the limitations of their condition.

Post-treatment care and monitoring are essential regardless of the degree of expected recovery. Animals that have experienced tracheal collapse episodes require ongoing observation for respiratory signs indicating recurrence or progression. Environmental conditions should be optimized to minimize respiratory stress, with attention to temperature, humidity, and air quality. Gradual return to normal activity levels allows assessment of respiratory tolerance without triggering acute episodes. Regular veterinary reassessment evaluates treatment effectiveness and guides adjustments to management protocols. Body condition monitoring ensures adequate nutrition without excess weight gain that would increase respiratory demands.

Prognosis factors for tracheal collapse include the severity of collapse, underlying cause, response to initial treatment, and available management resources. Mild cases with identifiable reversible causes carry favorable prognosis for functional recovery. Moderate cases may maintain acceptable quality of life with ongoing management but typically do not fully resolve. Severe cases involving extensive cartilage damage or complete tracheal rings have guarded to poor prognosis for meaningful improvement. Young animals may have better healing capacity than older individuals. The availability of appropriate long-term management, including environmental control and veterinary monitoring, influences practical outcomes significantly.

Return to production considerations guide expectations and management for recovered animals. Animals with resolved tracheal inflammation may return to full production following appropriate recovery periods. Those with permanent mild airway compromise may continue in production roles with recognition of reduced performance capacity and increased monitoring needs. Animals requiring ongoing medical management face drug withdrawal considerations if destined for slaughter or milk production. Breeding animals should demonstrate adequate respiratory function to handle the demands of pregnancy, lactation, or breeding activity without compromise. Honest assessment of each animal's functional capacity guides appropriate placement and production expectations.

Vaccination protocols contribute to tracheal collapse prevention by protecting against infectious diseases that damage tracheal structures. Infectious laryngotracheitis vaccination in poultry is particularly important, with modified live and recombinant vaccines available to protect against this significant cause of tracheal damage. Vaccination against other respiratory pathogens including Newcastle disease, infectious bronchitis, and Mycoplasma reduces the overall burden of respiratory disease that may affect tracheal health. In cattle and small ruminants, vaccination against major respiratory pathogens helps prevent severe infections that could cause secondary tracheal damage. Vaccination programs should be developed with veterinary guidance to address specific disease risks for each operation.

Biosecurity measures reduce the introduction and spread of infectious agents that can damage tracheal structures. Quarantine of new animals before introduction to existing populations allows observation for respiratory disease signs. Limiting contact with potential disease sources including wild birds, other farms, and contaminated equipment reduces pathogen exposure. Personnel hygiene practices between animal groups prevent disease transmission. All-in-all-out management in poultry operations breaks disease cycles between flocks. Cleaning and disinfection of housing between groups eliminates environmental pathogen reservoirs. Prompt isolation of animals showing respiratory disease signs prevents spread to susceptible herd or flock mates.

Nutritional prevention strategies support tracheal health through proper cartilage development and maintenance. Adequate protein intake provides amino acids necessary for cartilage matrix synthesis. Trace minerals including manganese, copper, and zinc play roles in cartilage metabolism and should be provided at appropriate levels. Vitamin C, while synthesized by most farm animals, may be supplemented during stress periods to support collagen formation. Vitamin A deficiency can affect epithelial integrity throughout the respiratory tract. Balanced ration formulation ensures all nutrients supporting cartilage health are provided without excesses that could cause other problems.

Management practices significantly influence tracheal collapse risk and can be optimized for prevention. Handling and restraint techniques should avoid pressure on the neck and throat area that could damage tracheal structures. Equipment including collars, halters, and neck rails should fit properly without creating chronic pressure. Ventilation systems should maintain good air quality with low ammonia and dust levels that reduce chronic respiratory irritation. Temperature management prevents extreme heat stress that increases respiratory effort. Appropriate stocking densities reduce competition and stress. In poultry, proper litter management and ventilation are essential for respiratory health. Training farm personnel in proper handling techniques protects animals from accidental injury.

Quarantine and testing protocols provide systematic approaches to preventing tracheal-damaging diseases at the population level. New animal introductions should include health screening and observation periods before joining established groups. Respiratory disease outbreaks should prompt diagnostic investigation to identify causative agents and appropriate control measures. Postmortem examination of animals dying with respiratory signs provides valuable diagnostic information. Environmental monitoring for air quality parameters identifies conditions requiring correction. Regular review of respiratory health records identifies trends or problems requiring intervention. Veterinary consultation helps develop and refine prevention programs appropriate to each operation's specific risks and resources.

Daily management and monitoring of animals with tracheal collapse risk or confirmed disease requires attention to respiratory status as part of routine observation. Handlers should be trained to recognize respiratory distress signs including increased effort, abnormal sounds, extended neck posture, and cyanosis. Monitoring during feeding and watering identifies animals having difficulty with these activities. Observation during any handling or movement reveals exercise intolerance. Temperature and weather conditions should be considered in relation to respiratory status, with increased vigilance during hot, humid conditions. Individual animals with known tracheal problems should be identified and monitored with particular attention.

Housing and environmental management are critically important for animals with tracheal collapse or at-risk populations. Ventilation systems must effectively remove moisture, ammonia, and dust while maintaining comfortable temperatures without drafts. Ammonia levels should be maintained below ten parts per million, with lower targets preferred. Dust control measures include appropriate litter management in poultry, reducing fines in feed, and avoiding dusty bedding materials. Temperature extremes require mitigation through heating, cooling, or ventilation adjustments. Humidity management prevents both overly dry conditions that irritate airways and excessively humid conditions that promote respiratory pathogen growth.

Herd health programs integrate tracheal collapse prevention and management into comprehensive respiratory health strategies. Regular veterinary visits assess overall respiratory health status and identify emerging problems. Vaccination programs address preventable causes of tracheal damage. Parasite control reduces respiratory tract parasites that may affect tracheal health. Environmental monitoring and improvement address modifiable risk factors. Treatment protocols for respiratory disease cases are established in advance for consistent, appropriate responses. Culling criteria guide decisions about animals with progressive or severe tracheal compromise.

Record keeping and monitoring systems track respiratory health indicators and tracheal collapse occurrence. Individual animal records document respiratory problems, treatments, and outcomes. Mortality records with postmortem findings identify tracheal pathology in deceased animals. Environmental monitoring data track air quality parameters over time. Treatment records ensure proper drug withdrawal time calculation and compliance. Analysis of records over time reveals seasonal patterns, management associations, or progression trends. Regular veterinary review of records informs prevention and management program adjustments.

Economic considerations influence management decisions for tracheal collapse at individual and herd levels. Prevention investments in ventilation, handling equipment, and vaccination should be evaluated against expected disease reduction. Treatment costs for affected individuals include veterinary services, medications, and labor for specialized care. Production losses from affected animals impact profitability through reduced growth, feed efficiency, and marketability. Severely affected animals represent total losses of initial investment and ongoing costs without production return. Chronic management of mildly affected animals requires ongoing resource commitment. Cost-benefit analysis guides decisions about prevention investment, treatment intensity, and culling policies to optimize both animal welfare and farm viability.

High-risk breeds and species for tracheal collapse include those with rapid growth characteristics, specific conformational features, or production system factors that increase susceptibility. Commercial broiler chickens and turkeys bred for rapid growth may experience disproportionate development of body mass relative to respiratory structures, creating functional imbalances. Broiler strains reaching market weight very quickly are particularly susceptible to respiratory compromise including tracheal problems. Heavy meat-type poultry breeds have higher tracheal disease rates compared to lighter egg-type breeds. Among cattle, no specific breeds show markedly increased tracheal collapse susceptibility, though any breed may be affected by traumatic or infectious causes.

Production type considerations affect tracheal collapse risk patterns within species. Intensive production systems with high stocking densities may have increased respiratory disease pressure affecting tracheal health. Commercial poultry operations face different challenges than backyard or pastured flocks due to environmental differences. Rapidly grown animals in any species may have tissue development imbalances affecting structural integrity. Animals in high-production phases face increased respiratory demands that may exacerbate underlying tracheal weakness. Confinement housing creates different air quality challenges than extensive outdoor systems.

Genetic selection and testing offer opportunities for reducing tracheal collapse incidence over time. Breeding stock selection should avoid animals with history of tracheal problems or from lines with high respiratory disease rates. In poultry, balanced breeding objectives that include respiratory health alongside growth rate may reduce incidence of growth-related tracheal problems. Avoiding selection for extremely rapid growth without consideration of structural development helps maintain respiratory system integrity. Animals experiencing tracheal collapse should be removed from breeding populations to prevent propagation of susceptible genetics. Future development of genetic markers for tracheal cartilage strength could enable more targeted selection strategies.

Commonly co-occurring conditions with tracheal collapse include other respiratory tract diseases that share causative factors or develop as complications. Chronic bronchitis often accompanies tracheal collapse, with inflammation affecting the entire conducting airway. Laryngeal disease, including paralysis and inflammatory conditions, may occur alongside tracheal pathology. Secondary bacterial pneumonia can develop when compromised upper airways allow pathogen entry to the lungs. Aspiration pneumonia may result from impaired swallowing coordination associated with severe tracheal compromise. Cor pulmonale, right heart failure secondary to chronic respiratory disease, can develop in long-standing cases.

Conditions with similar symptoms requiring differentiation from tracheal collapse include various causes of respiratory distress and coughing. Laryngeal paralysis causes inspiratory stridor that may resemble tracheal collapse sounds. Tracheal foreign body obstruction produces acute respiratory distress. Tracheal masses, including tumors and abscesses, create progressive airway obstruction. External compression of the trachea from enlarged lymph nodes, thyroid enlargement, or other masses mimics collapse signs. Chronic obstructive pulmonary disease affects breathing with coughing and exercise intolerance. Cardiac disease can cause respiratory difficulty and exercise intolerance. Infectious laryngotracheitis in poultry causes severe tracheal signs that may include or progress to collapse.

Complications and sequelae of tracheal collapse can significantly impact affected animals over time. Chronic hypoxia from inadequate ventilation affects all body systems and reduces productivity. Aspiration pneumonia develops when impaired airway function allows feed or water to enter the lower respiratory tract. Secondary bacterial infections colonize the compromised airway. Chronic coughing may exacerbate the collapse and can lead to syncope or collapse episodes. Right heart failure can develop from chronic increased pulmonary vascular resistance. The stress of chronic respiratory difficulty affects immune function and overall health. Quality of life deteriorates progressively in unmanaged cases, eventually necessitating humane euthanasia.