Cardiac Surgery Team, Chayagasaka Animal Hospital, Nagoya, Aichi, Japan.
Heart-Will Animal Hospital, Kita-Kyushu, Hukuoka, Japan.
Open Vet J. 2024 Feb;14(2):743-749. doi: 10.5455/OVJ.2024.v14.i2.15. Epub 2024 Feb 29.
Cardiac myxomas are benign tumours 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.
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 tumour was histopathologically identified as a myxoma. The dog survived with no cardiac complications for 11 years after surgery.
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.
心脏黏液瘤是一种良性肿瘤，可发生在心脏的任何腔室或瓣膜。它们在狗中极为罕见。我们报告了一个新的病例，涉及一只小型犬的左心室流出道（LVOT）中的心脏黏液瘤和室间隔缺损（VSD）。
一只雌性迷你腊肠犬（年龄，7 个月；体重，2.88 千克）表现出生长不良、嗜睡和心脏杂音。超声心动图显示 LVOT 有一个小息肉状肿块和膜性 VSD。同时进行了手术，使用表面冷却低温体外循环和逆行心脏停搏进行切除肿块（升主动脉切开术）和关闭 VSD（右心房切开术）。肿瘤的组织病理学诊断为黏液瘤。手术后，这只狗在没有心脏并发症的情况下存活了 11 年。
据我们所知，这是首例报告在小型犬中经生前诊断并同时手术修复阻塞 LVOT 的心脏黏液瘤和 VSD 的病例。除了描述这个复杂病例外，本报告还首次报道了在小型犬的心脏直视手术中使用逆行心脏停搏。
