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Dilated Cardiomyopathy in Great Danes in the United Kingdom
Great Danes (GD) are predisposed to dilated cardiomyopathy (DCM), but little is known about progression, clinical manifestations, or inheritance in dogs in the UK. For echocardiographic screening, breed-specific reference intervals (RI) are required.
The aim of this study was to document the prevalence, clinical manifestations, and inheritance of DCM in UK GD as well as to establish RI for Doppler echocardiography (ECHO) in GD. The results are alarming - every third dog showed DCM!


107 client-owned GDs were included in this Echocardiographic screening study.

Dogs were scored on ECHO and ECG variables and classified as normal (NORM), equivocal (EQUIV), or affected (AFX).

Forty NORM dogs were used to determine RI for ECHO. Pedigrees from all dogs were examined for mode of inheritance.

Results: The prevalence of DCM in this population, based on score, was 35.6%.

Significant differences in M mode left ventricular dimensions (MMLVD) were identified between male and female dogs (P < .011).

RI for MMLVD and transformed MMLVD (allometric scaling) were lower than previously suggested. When dogs were reclassified using amended RI for MMLVD, prevalence increased to 47%.

End-systolic volume index more reliably identified AFX dogs than other systolic function indices.

Ventricular arrhythmias (VA) were commonly identified, with the highest prevalence in AFX dogs (54%).

Pedigree analysis suggested an autosomal dominant mode of inheritance.

Conclusions and Clinical Importance: The prevalence of DCM in UK GD is higher than previously reported and autosomal dominant inheritance is likely.

Sex or body weight-dependent RI should be used for ECHO in GD and current RI might underestimate ESVI in GD. VA might play an important role in GD with DCM.


Source: Stephenson, H.M., Fonfara, S., López-Alvarez, J., Cripps, P. and Dukes-McEwan, J. (2012), Screening for Dilated Cardiomyopathy in Great Danes in the United Kingdom. Journal of Veterinary Internal Medicine, 26: 1140–1147. doi: 10.1111/j.1939-1676.2012.00987.x




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SMALL ANIMAL PRACTICE

Reference intervals for blood parameters in Shetland Sheepdogsmembers
Several breeds have physiological peculiarities that induce variations in reference intervals (RIs) compared with the general canine population. Shetland sheepdogs (SSs) are reported to be more predisposed to different diseases (eg, hyperlipidemia, gallbladder mucocele, and hypothyroidism). Consequently, a breed‐specific approach is more often required. Thus, the aim of this study was to determine whether the RIs of the general canine population could be applied to that of SSs, and to generate breed‐specific RIs, where appropriate.

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