• Advertisement

Common Cause of Respiratory Distress in dogs and cats

有病治病,沒病強身

Common Cause of Respiratory Distress in dogs and cats

Postby admin » Sun Mar 20, 2016 6:39 pm

http://criticalcaredvm.com/pleural-space-disease/

Respiratory distress in dogs and cats is always scary and often frustrating. A common cause is pleural space disease, the accumulation of fluid and/or air between the body wall and the lungs. This week I review this medical condition so pet parents have some familiarity with it. Please consider sharing it with other pet parents so we can spread the word. Happy reading!

Pleural Space Disease – What is it?

The pleural cavity is a potential space between the body wall and the lungs. Under normal circumstances, there is nothing in this cavity. The lungs lay directly against the body wall. Certain diseases cause air and/or fluid to accumulate in the pleural cavity. The name of the condition varies depending on what accumulates in the pleural cavity. Pneumothorax is the term used to describe the accumulation of air within the pleural cavity. Potential reasons for air to accumulate in the pleural cavity include trauma, cancer, and rupture of abnormal lung structures called bullae.

pleural space
An illustration showing the location of the potential pleural space between the lungs and the body wall


Several diseases can cause fluid to accumulate in the pleural cavity – this is called pleural effusion. Veterinarians categorize the fluid based on protein concentration and cellular components. Categories include

Transudate – this fluid has a low protein concentration and cell composition
Modified transudate – this fluid contains a moderate amount of protein and cells
Exudate – this fluid can be infected (septic) or non-infected (non-septic); a septic exudate is commonly called a pyothorax
Hemorrhage – this fluid contains protein and cells in similar concentrations as those found in blood; this condition is called a hemothorax
Chyle – this is fluid that flow through the lymphatic system, and contains a moderate amount of protein with a low-to-moderate cell count; this condition is called a chylothorax
pleural space
The appearance some different pleural effusions in dogs and cats. #1 chylothorax; #2 & #8 traumatic effusion; #3, #6, &#7 cancerous effusion; #4 & #5 feline infectious peritonitis (FIP)


Conditions associated with pleural effusion are:

Congestive heart failure
Lung lobe torsion
Diaphragmatic hernia
Pancreatitis
Pulmonary thromboembolism
Cancers (e.g.: lymphoma, thymoma, mesothelioma, primary lung tumors, metastatic cancers)
Anticoagulation rat poisons
Inflammation of blood vessels
Feline infectious peritonitis (FIP)
Low albumin level secondary to kidney and/or gastrointestinal diseases
Lymph vessel obstruction
Pleural Space Disease – What are the clinical signs?

Regardless of whether air or fluid is present in the pleural cavity, patients with pleural space disease typically have the same clinical signs. Most pets develop sudden respiratory distress. The abnormally accumulating fluid and/or air prevents the lungs from properly expanding during inhalation (breathing in). Consequently, affected pets take shallow and rapid breaths. Other signs of pleural space disease include:

Lethargy
Reduced (or loss of) appetite
Exercise intolerance
A veterinarian will thoroughly evaluate patients with suspected pleural space disease. Common physical examination findings include the previously mentioned shallow rapid breathing, as well as anxiety/distress, panting, blue/grey gums and tongue, and muffled heart and lung sounds.

Pleural Space Disease – How is it diagnosed?

A patient’s cumulative history and physical examination findings frequently provide veterinarians with enough information to have a very high index of suspicion that a patient is living with pleural space disease. Radiographs (x-rays) readily show air and/or fluid in the pleural cavity. Ultimately a minimally invasive procedure called a thoracocentesis (also called a pleurocentesis or a chest tap) must be performed to remove fluid and/or air from the pleural cavity.

Radiographs (x-rays) showing pleural effusion in a patient. Photo courtesy of Dr. O'Meara
Radiographs (x-rays) showing pleural effusion in a patient. Photo courtesy of Dr. O’Meara


Your family veterinarian may recommend evaluation by a board-certified veterinary internal medicine specialist or board-certified veterinary emergency and critical care specialist to help determine the cause of your pet’s pleural space disease and to develop an appropriate treatment plan. However, patients in respiratory distress should be stabilized prior to transport to a referral/specialty hospital. While family veterinarians may be logically inclined to refer your pet immediately, transporting an unstable patient in respiratory distress can be lethal. Thus your family veterinarian will perform a thoracocentesis to stabilize an unstable pet before transport to a referral/specialty hospital.

pleural space
A veterinarian removes pleural effusion from a dog
Pleural Space Disease – How is it treated?

The initial treatment for a patient with pleural space disease is removing air and/or fluid from the pleural cavity. As mentioned earlier, the pleural cavity is evacuated via a minimally invasive procedure called a thoracocentesis; thus this procedure is both diagnostic and therapeutic. After performing a thoracocentesis, chest radiographs (x-rays) are reevaluated to look for an underlying cause since the lungs are now better able to expand. Some patients require more than one thoracocentesis, and those who require multiple chest taps often benefit from the placement of a thoracostomy tube (also called a chest tube).

Veterinarians can look at pleural fluid under the microscope before submitting it for
Veterinarians can look at pleural fluid under the microscope before submitting it for evaluation by a board-certified veterinary clinical pathologist


Any fluid should be evaluated for protein content and cell composition. Initially evaluating pleural effusion under the microscope in the hospital is helpful, but a sample should also be sent to a reference veterinary laboratory for evaluation by a board-certified veterinary clinical pathologist. Patients are provided supplemental oxygen to help them breathe with improved comfort. Additional therapies should be tailored to the underlying cause of the fluid and/or air accumulation in the pleural cavity. Some diseases are more treatable than others, and the key to maximizing a positive outcome is evaluation by a veterinarian as soon as possible.

The take-away message about pleural space disease…

In normal dogs and cats, there is nothing between the lungs and the body wall. However, a variety of diseases cause fluid and/or air to build up in this location called the pleural space. Patients with pleural space disease often experience marked respiratory distress and are at risk for sudden death. Timely and efficient diagnostic investigation and therapeutic intervention are absolutely essential for maximizing the likelihood of a positive outcome.
  • 0

Share/分享:
懶得有理_____難得有你
think unique,be special
admin
Site Admin
Site Admin
 
Posts: 3361
Joined: Sat May 22, 2010 7:54 pm
Reputation: 0

Return to 奇狗雜症

Who is online

Users browsing this forum: No registered users and 1 guest

cron
Reputation System ©'