Mitral Valve Replacement with a Mechanical Valve for Severe Mitral Regurgitation in a Small Dog

Taguchi, Daisuke; Kanemoto, Isamu; Yokoyama, Seiji; Mizuno, Masashi; Washizu, Makoto

doi:10.1155/2014/892625

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…We previously performed MVR in a small dog with severe, complicated MR (as in the dog in case 2) that died from thrombosis 2 years and 1 month after the operation. 25 It appears that MVP consisting of CR with ePTFE sutures and semicircular suture AP with Proline sutures improves the long-term durability and usability of repaired valves compared with replaced valves in small dogs. …”

Section: Discussionmentioning

confidence: 96%

Long-term survival of two dogs after mitral valve plasty

Kanemoto¹,

Taguchi

Mihara³

et al. 2017

Vet Sci Develop

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Two small 9-year-old dogs received mitral valve plasty (MVP) for severe mitral regurgitation that could not be controlled via drug administration. MVP consisted of chordal reconstruction using expanded polytetrafluoroethylene (ePTFE) sutures and semicircular suture annuloplasty using polypropylene sutures. In both cases, the clinical signs dramatically improved after MVP, although postoperative echocardiography revealed slight residual mitral regurgitant flow. Both dogs survived for several years after MVP without any signs of cardiac distress; one dog survived for 9 years and 1 month, and the other dog survived for 7 years and 10 months. These findings highlight the durability of ePTFE sutures as artificial chordae and the excellence of semicircular suture annuloplasty in small dogs.

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Section: Discussionmentioning

confidence: 96%

Long-term survival of two dogs after mitral valve plasty

Kanemoto¹,

Taguchi

Mihara³

et al. 2017

Vet Sci Develop

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“…Additionally, the cardioplegic solution volume was decreased to half of the usual volume (20 ml/kg) to avoid more hemodilution, although we used the lowest deep HT (ET 20°C) for cardioplegia. Thereafter, we used a hemoconcentrator to prevent excess hemodilution due to additional cardioplegic solution ( Taguchi et al ., 2014 ; Mihara et al ., 2017 ; Yokoyama et al ., 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Open-heart techniques and mitral valve plasty for mitral regurgitation in toy- and small-breed dogs: A review

2021

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In human medicine, in the past, open-heart techniques for low-bodyweight children and newborn babies with congenital heart disease were more difficult than high-bodyweight adults. In toy- and small-breed dogs with mitral regurgitation (MR), an acquired heart disease, these techniques are more difficult to perform than for congenital heart diseases in young medium-sized or large dogs because of old age and low body weight. Therefore, improved open-heart techniques and mitral valve surgery for severe MR in older toy- and small-breed dogs are essential. Through our surface-cooling hypothermia (sHT) studies, we designed a new, improved open-heart method, namely, “the low-flow cardiopulmonary bypass (CPB) combined with deep sHT in toy- and small-breed dogs (Japan method)”; sHT was later replaced by blood-cooling hypothermia (bHT). At the same time, we devised a new, improved mitral valve plasty (MVP) applicable to severe MR, instead of mitral valve replacement, in toy- and small-breed dogs. This MVP technique was combined with artificial chordal reconstruction, semi-circular suture annuloplasty (AP), and direct scallop-suture valvuloplasty. These MVP techniques are simple, durable, and lead to good long-term quality of life in toy- and small-breed dogs. This review highlights the benefits of our improved CPB and MVP techniques (Japan method) for severe MR in toy-and small-breed dogs, which have led to a high success rate for MVP in severe clinical MR cases in Japan. It may further contribute to the development of more robust techniques for MR in toy- and small-breed dogs. This also represents the first comprehensive review of the history of open-heart surgery, CPB techniques, and MVP methods for MR in toy- and small-breed dogs.

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“…Recently, there have been increased reports of using MVP to treat MR in dogs (Kanemoto et al, 1990(Kanemoto et al, , 2004Boggs et al, 1996;Griffiths et al, 2004;Uechi, 2012). However, there have been few reports of the application of MVP to treat severe MR involving the posterior leaflet (PL) in small dogs (Boggs et al, 1996;Uechi, 2012;Kanemoto et al, 2017), in whom MVR was previously indicated (Orton et al, 2005;Taguchi et al, 2014). Herein, we describe a case of severe MR caused by multiple lesions in the PL in a mixed Chihuahua, who was treated with a combination of the following three MVP techniques: artificial chordal reconstruction (CR) for the anterior leaflet (AL) and the PL, semicircular suture annuloplasty (AP) for a dilated mitral annulus, and valvuloplasty (VP) using newly devised direct scallop sutures for the PL.…”

Section: Introductionmentioning

confidence: 99%

Treatment of severe mitral regurgitation caused by lesions in both leaflets using multiple mitral valve plasty techniques in a small dog

Yokoyama¹,

Kanemoto²,

Mihara³

et al. 2017

Open Vet J.

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Mitral valve plasty (MVP) is preferred over mitral valve replacement (MVR) for mitral regurgitation in humans because of its favorable effect on quality of life. In small dogs, it is difficult to repair multiple lesions in both leaflets using MVP. Herein, we report a case of severe mitral regurgitation caused by multiple severe lesions in the posterior leaflet (PL) in a mixed Chihuahua. Initially, we had planned MVR with an artificial valve. However, MVP combined with artificial chordal reconstruction of both leaflets, semicircular suture annuloplasty, and valvuloplasty using a newly devised direct scallop suture for the PL was attempted in this dog. The dog recovered well and showed no adverse cardiac signs, surviving two major operations. The dog died 4 years and 10 months after the MVP due to noncardiovascular disease. Our additional technique of using a direct scallop suture seemed useful for PL repair involving multiple scallops in a small dog.

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Mitral Valve Replacement with a Mechanical Valve for Severe Mitral Regurgitation in a Small Dog

Cited by 7 publications

References 16 publications

Long-term survival of two dogs after mitral valve plasty

Long-term survival of two dogs after mitral valve plasty

Open-heart techniques and mitral valve plasty for mitral regurgitation in toy- and small-breed dogs: A review

Treatment of severe mitral regurgitation caused by lesions in both leaflets using multiple mitral valve plasty techniques in a small dog

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