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Case Report


Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog

Kippei Mihara, Isamu Kanemoto, Takanori Ando, Koudai Kawase, Kazuhito Iguchi, Satoko Yokoyama, Atsushi Asai, Katsuichiro Hoshi.


Abstract
Background:
Cardiac myxomas are benign tumors that can occur in any heart chamber or valve. They are extremely rare in dogs. We present a novel case involving a cardiac myxoma in the left ventricular outflow tract (LVOT) and a ventricular septal defect (VSD) in a small dog.
Case Description:
A female miniature dachshund (age, 7 months; weight, 2.88 kg) presented with growth insufficiency, lethargy, and a cardiac murmur. Echocardiography revealed a small polypoid mass in the LVOT and a membranous VSD. Simultaneous surgeries were performed to resect the mass (aortotomy) and close the VSD (right atriotomy) using low-flow cardiopulmonary bypass with surface-cooling hypothermia and retrograde cardioplegia. The tumor was histopathologically identified as a myxoma. The dog survived with no cardiac complications for 11 years after surgery.
Conclusion:
To our knowledge, this is the first report of ante-mortem diagnosis and simultaneous surgical repair of a cardiac myxoma obstructing the LVOT and a VSD in a small-breed dog. In addition to describing this complicated case, this report presents what we believe is the first reported use of retrograde cardioplegia during open-heart surgery in a small-breed dog.

Key words: Cardiac myxoma, Left ventricular outflow tract obstruction, Retrograde cardioplegia, Small-breed dog, Ventricular septal defect


 
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How to Cite this Article
Pubmed Style

Mihara K, Kanemoto I, Ando T, Kawase K, Iguchi K, Yokoyama S, Asai A, Hoshi K. Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. Open Vet J. 2024; 14(2): 743-749. doi:10.5455/OVJ.2024.v14.i2.15

Web Style

Mihara K, Kanemoto I, Ando T, Kawase K, Iguchi K, Yokoyama S, Asai A, Hoshi K. Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. https://www.openveterinaryjournal.com/?mno=171570 [Access: April 22, 2024]. doi:10.5455/OVJ.2024.v14.i2.15

AMA (American Medical Association) Style

Mihara K, Kanemoto I, Ando T, Kawase K, Iguchi K, Yokoyama S, Asai A, Hoshi K. Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. Open Vet J. 2024; 14(2): 743-749. doi:10.5455/OVJ.2024.v14.i2.15


Vancouver/ICMJE Style

Mihara K, Kanemoto I, Ando T, Kawase K, Iguchi K, Yokoyama S, Asai A, Hoshi K. Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. Open Vet J. (2024), [cited April 22, 2024]; 14(2): 743-749. doi:10.5455/OVJ.2024.v14.i2.15


Harvard Style

Mihara, K., Kanemoto, . I., Ando, . T., Kawase, . K., Iguchi, . K., Yokoyama, . S., Asai, . A. & Hoshi, . K. (2024) Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. Open Vet J, 14 (2), 743-749. doi:10.5455/OVJ.2024.v14.i2.15


Turabian Style

Mihara, Kippei, Isamu Kanemoto, Takanori Ando, Koudai Kawase, Kazuhito Iguchi, Satoko Yokoyama, Atsushi Asai, and Katsuichiro Hoshi. 2024. Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. Open Veterinary Journal, 14 (2), 743-749. doi:10.5455/OVJ.2024.v14.i2.15


Chicago Style

Mihara, Kippei, Isamu Kanemoto, Takanori Ando, Koudai Kawase, Kazuhito Iguchi, Satoko Yokoyama, Atsushi Asai, and Katsuichiro Hoshi. "Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog." Open Veterinary Journal 14 (2024), 743-749. doi:10.5455/OVJ.2024.v14.i2.15


MLA (The Modern Language Association) Style

Mihara, Kippei, Isamu Kanemoto, Takanori Ando, Koudai Kawase, Kazuhito Iguchi, Satoko Yokoyama, Atsushi Asai, and Katsuichiro Hoshi. "Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog." Open Veterinary Journal 14.2 (2024), 743-749. Print. doi:10.5455/OVJ.2024.v14.i2.15


APA (American Psychological Association) Style

Mihara, K., Kanemoto, . I., Ando, . T., Kawase, . K., Iguchi, . K., Yokoyama, . S., Asai, . A. & Hoshi, . K. (2024) Simultaneous surgical repair of a cardiac myxoma causing left ventricular outflow tract obstruction and a ventricular septal defect in a small dog. Open Veterinary Journal, 14 (2), 743-749. doi:10.5455/OVJ.2024.v14.i2.15


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