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What is Pericardial Window?

A pericardial window is a surgical procedure that involves removing a small portion, usually four to five centimeters, of the pericardium, the fibrous sac that protects the heart. This is done to resolve pericardial effusion, or the buildup of fluid in the pericardium. It is a quicker and less invasive procedure compared to other cardiac procedures.

This procedure should not be confused with pericardiectomy, which is the total removal of the pericardium. However, a pericardial window may also be made in dogs undergoing partial pericardiectomy.

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Pericardial Window Procedure in Dogs

A thoracoscope, which is a specialized camera used to visualize the heart, is used to guide this procedure. This means that the surgeon will not open the heart. However, if severe complications occur during surgery, the surgeon may need to perform an open thoracotomy. The procedure steps for creating a pericardial window are detailed below.

  1. A veterinarian will take blood tests prior to surgery to ensure anesthetization is safe for the dog.
  2. An ECG will be taken before general anesthesia is administered.
  3. If the pericardial effusion is significant enough to decrease visualization, some of the fluid may be removed through pericardiocentesis. This procedure involves removing the fluid using a special needle.
  4. The operative area is shaved, cleaned, and clipped.
  5. The surgeon will create at least three ports, which are small incisions into the chest, through which the camera and other surgical instruments are inserted.
  6. The camera is placed into one of the ports.
  7. Endoscopic graspers, used to grip the pericardium, are inserted through one of the ports. Maintaining a firm grasp on the pericardium may take a few moments, since the heart is always beating.
  8. The pericardium is pulled away from the heart
  9. Endoscopic scissors are used to cut the selected portion of pericardium.
  10. This will release the fluid, which will be collected via suction.
  11. The portion of pericardium is then removed with endoscopic scissors.
  12. A catheter is put in place while the port incisions are sutured. The catheter is removed after closure.
  13. The dog will be hospitalized for approximately twenty-four hours, or according to surgeon instructions. The removed pericardium and fluid are sent to a laboratory for analysis.

Efficacy of Pericardial Window in Dogs

Pericardial window is considered effective in resolving pericardial effusion. The buildup of fluid almost always recurs in dogs that do not receive a pericardial window. It is also less invasive than other procedures, and dogs are often released from the hospital as quickly as one day after surgery. Some dogs return to normal activity within three months after surgery. Unfortunately, pericardial window is often a palliative treatment – that is, done to relieve pain rather than cure the underlying condition – in dogs diagnosed with cardiac cancers.

Pericardial Window Recovery in Dogs

Owners should follow their surgeon’s recovery instructions very carefully. Analgesics and antibiotics are administered to prevent postoperative infection and manage pain. Dogs should rest, not engaging in any exercise, for up to six weeks after surgery, or as instructed by the surgeon. A bandage will be applied to the surgery site until the sutures are removed within fourteen days. This should be kept clean and dry to prevent infection. Upon changing the bandage, owners should inspect the suture site to ensure no swelling, drainage, or bleeding has occurred. If this occurs, owners need to contact their veterinarian immediately. A follow-up appointment will take place two weeks after surgery to evaluate cardiac function and remove sutures. Follow-up appointments will be scheduled as needed to conduct additional ECGs and monitor cardiac function.

Cost of Pericardial Window in Dogs

The cost of pericardial window will vary based on standards of living and additional treatment costs. On average, the price of pericardial window ranges from $500 to $1,000.

Dog Pericardial Window Considerations

Thoracoscopic cardiac procedures decrease the risk of intraoperative soft tissue trauma. It also causes less pain than open procedures, and provides better visualization of the heart and pericardium. Dogs recover quickly from the procedure and are allowed to go home soon after surgery. It also carries a lower morbidity rate compared to open heart surgery.

Although pericardial window is less invasive and more effective in resolving pericardial effusion than other cardiac procedures, complications are possible, and may include:

  • Herniation of the heart through the window, particularly if the window is large
  • Closure of the window over time

If the window closes, a second surgery will be required. This may involve creating a new window, or removing part of all of the pericardium. Additionally, thoracoscopic equipment is expensive, and may not be available at all veterinary hospitals.

Pericardial Window Prevention in Dogs

Cardiac conditions are often difficult to prevent, particularly cancer and idiopathic pericardial effusion. Owners should make sure their dogs do not engage in activities that may cause traumatic injury to the heart. If owners notice signs of bacterial or fungal infection, they should seek immediate veterinary attention.

Pericardial Window Questions and Advice from Veterinary Professionals

Staffordshire Bull Terrier Cross
9 Years Plus
Moderate condition
0 found helpful
Moderate condition

Has Symptoms

See description

Medication Used

Antibiotics and Pain killers

Hi ,

Cassie has had a fenestration done as we have found she has pericardial effusion. This was done down the centre of her chest instead of via the side. This was so the Vet could see what was going on properly as nothing showing on X-rays or ultrasound.
A small bit of tissue that looked sick was removed and had been sent to the lab to see if it is cancerous.

My question is since Cassie has had the procedure she has been breathing short sharp and sometimes quite strong breaths. Is this normal due to being cut open down the centre of her chest?

The vet has done 1 check up on her already and seemed happy with her but just want to put my partner and my minds at rest.

She also has very heavy bruising around the stitches but I expected this.

If you could give my any feedback or advice or tips that would be very much appreciated.


Dr. Callum Turner, DVM
Dr. Callum Turner, DVM
2478 Recommendations
It is not unusual for breathing to be uncomfortable after this level of surgery and a dog will adjust their breathing accordingly to what they feel is more comfortable; also as you suspect, bruising is going to be normal especially given the type of surgery performed. If you Veterinarian is happy with Cassie when she went in for her check up I wouldn’t be too concerned, but keep an eye on her and keep her rested for the time being. Regards Dr Callum Turner DVM

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