강아지 횡격막 탈장 자주 묻는 질문 Q&A — 보호자가 꼭 알아야 할 핵심

Dog Diaphragmatic Hernia FAQ — Key Information Pet Owners Must Know

RespiratoryQ&AMeongsiljang Veterinary Advisory Board

A diaphragmatic hernia in dogs is a serious respiratory condition that can occur after trauma. We’ve compiled the key information pet owners need to know in a Q&A format.

What is a diaphragmatic hernia in dogs?

The condition in which abdominal organs have shifted into the thoracic cavity due to a diaphragmatic hernia

A diaphragmatic hernia in dogs occurs when the diaphragm, which separates the chest and abdomen, ruptures, allowing abdominal organs to shift into the thoracic cavity. The key issue is not just the break in the diaphragm’s continuity, but the displacement of organs, which can cause respiratory and overall health problems. Most cases occur after blunt trauma, such as car accidents or falls, and can happen in any part of the diaphragm, regardless of breed or body type. If you notice breathing difficulties after an injury, seek veterinary care immediately. - Diaphragmatic rupture: Trauma can damage the diaphragm, allowing abdominal organs to move into the chest cavity. - Difficulty breathing: Your dog may struggle to take deep breaths or breathe with its mouth open. - Multiple factors contributing to breathing issues: Shock, chest wall injuries, lung contusions, and fluid in the chest can all combine to make breathing difficult. - Quick recognition is crucial: If symptoms appear, visit a vet right away. Stabilize your dog’s condition first, then proceed with treatment at the appropriate time.

What causes a diaphragmatic hernia?

The primary cause of diaphragmatic hernia is trauma. The diaphragm can be suddenly damaged and rupture due to vehicle accidents, falls, or strong compression. Diaphragmatic hernias are classified as either congenital or acquired, with acquired cases being the most common and frequently occurring after blunt trauma. Traumatic diaphragmatic hernias can occur in dogs of any breed or body type and can develop in any part of the diaphragm. If symptoms appear, immediate examination is necessary. - Post-trauma monitoring: Complications such as pulmonary contusion or arrhythmias may not become apparent until 24–48 hours after the trauma, so careful observation is essential. - Risk factors: For dogs that have suffered trauma, it is advisable to consider the possibility of a hernia and undergo examination, even if their breathing appears normal. - Importance of early detection: While early diagnosis is beneficial, surgery is often performed only after other traumatic injuries, such as shock, have been stabilized.

A dog suspected of having a diaphragmatic hernia following trauma

What are the main symptoms?

The most common symptom of a diaphragmatic hernia is difficulty breathing. Your pet may struggle to take deep breaths and may breathe rapidly with an open mouth. In severe cases, a lack of oxygen can cause cyanosis, where the lips or tongue turn blue, along with a rapid pulse and potential shock. However, breathing difficulties often result from multiple factors acting together, including the hernia itself, shock, chest wall injuries, lung contusions, or pleural effusion. - Difficulty breathing: Your pet may breathe rapidly or show excessive chest movement. - Cyanosis: The lips or tongue may turn blue due to insufficient oxygen supply. - Signs of shock: A rapid pulse and lethargy may occur, potentially leading to shock. - Lethargy and collapse: Your pet may suddenly lose strength and become unable to move. - Immediate veterinary care required: If you notice these symptoms, consult a veterinarian immediately.

A puppy experiencing breathing difficulties due to a diaphragmatic hernia

Signs requiring immediate veterinary visit

If your dog suddenly starts panting heavily, their mouth turns blue, or they collapse and become unresponsive, you need to go to the vet immediately. This is a life-threatening emergency. If their breathing and heart rate increase, the vet needs to take immediate action. Delaying treatment can lead to organ damage or death.

How is it diagnosed?

Diaphragmatic hernias are primarily diagnosed through X-rays. If the diaphragm line is not visible, the heart's outline appears blurred, or abdominal organs filled with gas or contents are seen within the thoracic cavity, a hernia is suspected. When an X-ray suggests a hernia, an ultrasound is used for further confirmation; one study found that ultrasounds successfully diagnosed the condition in about 95% of cats. If respiratory issues arise after trauma, immediate imaging is recommended. - X-ray Examination: The most fundamental diagnostic method, used to check if abdominal organs are visible within the thoracic cavity. - Ultrasound Examination: Helps confirm the presence of a hernia when suspected on an X-ray. - Additional Evaluations, Such as Blood Tests: Assess the overall condition, especially if accompanied by trauma. - Thoracocentesis: May be necessary to remove air or fluid from the thoracic cavity if it causes breathing difficulties. - Importance of Prompt Diagnosis: While early diagnosis is beneficial, the timing of surgery depends on the patient's condition.

Chest X-rays for diagnosing diaphragmatic hernia

What are the treatment options?

Diaphragmatic hernias are most commonly treated with surgery. The procedure involves suturing the torn diaphragm and returning any organs that have shifted into the chest cavity back into the abdomen. However, surgery is often performed only after stabilizing other trauma-related issues, such as shock. Immediate surgery is required if gastric dilation (bloating) is present. During anesthesia, positive-pressure ventilation (artificial respiration) is provided. Postoperatively, pain management, respiratory support, and activity restriction are essential. - Surgical Treatment: The key steps are suturing the diaphragm and repositioning displaced organs. - Timing of Surgery: Surgery is typically delayed until other injuries, such as shock, are stabilized, but it is performed immediately if gastric dilation is present. - Pre- and Postoperative Care: Vital signs are stabilized through oxygen supplementation and intravenous fluids. - Pain Management: Medication is administered to control severe pain. - Respiratory Care: Supplemental oxygen and respiratory support are provided as needed. - Activity Restriction: Walking and running should be avoided during the recovery period.

A puppy recovering from diaphragmatic hernia surgery

Mild vs. Severe vs. Emergency Situations Comparison

Item	Symptom	Breathing Status	Consciousness Status	Emergency Response
Mild	Slight shortness of breath	Slightly faster	Normal	Schedule a hospital visit
Severe	Severe shortness of breath, cough	Very fast	Lethargic	Immediate hospital visit
Emergency	Blue mouth, collapse	Risk of stopping	Loss of consciousness	Visit the emergency room

If symptoms worsen, an immediate hospital visit is needed. Delay increases the threat to life.

Small Breeds Are at Higher Risk

Diaphragmatic hernias can occur in any dog that has suffered trauma, regardless of breed or body type. If your dog shows rapid or abnormal breathing after an injury, it’s essential to have them examined by a veterinarian. To help prevent this, always secure your dog safely when traveling in a vehicle.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can a diaphragmatic hernia be treated?

Yes, most cases can be treated with surgery. However, surgery is typically performed only after stabilizing the patient from traumatic injuries such as shock, whereas gastric dilation requires immediate surgical intervention. Postoperative recovery varies from patient to patient.

How long does the recovery period after surgery take?

Recovery time varies depending on the patient’s condition and the extent of the surgery. During the recovery period, activity restriction and regular check-ups are necessary, so please be sure to follow your veterinarian’s instructions.

Can a diaphragmatic hernia recur?

While there is a possibility of recurrence, it can be reduced with appropriate surgery and care. After surgery, it is important to prevent trauma.

Can it be prevented?

The most important thing is to prevent injuries from car accidents or falls. When traveling in a car, it's best to secure your dog safely with a seatbelt or in a crate.

Can a veterinarian miss a hernia?

In the early stages, it may be difficult to confirm the condition with X-rays alone. In such cases, additional tests like ultrasound may be used for confirmation. If symptoms persist, please return to the clinic for a follow-up examination.

7 Key Management Strategies for Feline Asthma and Product Selection Criteria Highlighted by Veterinarians

Best Recommendations and Selection Criteria for Monitoring Your Cat’s Respiratory Rate (RR) During Sleep for Heart Care

Top Recommended Products for Managing Canine Viral Upper Respiratory Infections and Selection Criteria

What Is Feline Hepatic Fibrosis and Cirrhosis? — Key Q&A on Symptoms to Prognosis

What is Feline Triaditis (Liver-Pancreas-Intestine)? — Key Summary from Symptoms to Treatment

Elevated Liver Enzymes (ALT/ALP) in Cats: Causes and Necessary Tests

When Common Drugs and Toxins Damage a Cat’s Liver — Warning Signs of Liver Injury and When to Act

My Cat Keeps Vomiting — Is It a Warning Sign of Cholecystitis? Q&A on Abdominal Pain and Vomiting Management

If Your Cat Has Jaundice — Key Q&A on the Causes and Treatment of Cholangiohepatitis

My Cat’s Eyes Have Turned Yellow — Bile Duct Obstruction: Is It an Emergency? Q&A on When to Visit the Vet

References

[1] Plumb's Veterinary Drug Handbook, 9th Edition, 2022

[2] Clinical Medicine of the Dog and Cat, 4th Edition, 2020

[3] Veterinary Surgery: Small Animal, 2nd Edition, 2019