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Updated: Mar 6, 2026

An Image Guided Transapical Mitral Valve Leaflet Puncture Model of Controlled Volume Overload from Mitral Regurgitation in the Rat
Published on: May 19, 2020
Prevalence of mitral valve regurgitation in 79 asymptomatic Norfolk terriers
A Bodegård-Westling1, A Tidholm2, J Häggström3
1Anicura Albano Animal Hospital, Rinkebyvägen 21, 18236, Danderyd, Sweden.
Objectives:
To determine the prevalence of mitral valve regurgitation (MR) in asymptomatic Swedish Norfolk terriers.
Animals:
Seventy-nine privately owned Norfolk terriers.
Materials And Methods:
A prospective observational study was conducted where dogs were recruited via the Swedish Norfolk terrier club. All dogs were examined using the same protocol including physical examination and Doppler echocardiography.
Results:
Fifteen dogs (19%) had a murmur at the time of the examination. A total of 35 dogs (44%) had MR, including 23 dogs (29%) with both MR and tricuspid valve regurgitation and 12 dogs (15%) with MR only, identified on Doppler echocardiography. In addition, 7 dogs (9%) had tricuspid valve regurgitation only. The prevalence of MR increased with increasing age (p < 0.0001).
Conclusions:
Mitral valve regurgitation is common in asymptomatic Norfolk terriers with and without murmurs and the prevalence increases with age. The impact of MR in this breed on survival remains to be elucidated by a longitudinal study.
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