Dachshund's question about First-Degree Atrioventricular Block

Question

Took my 11 year old dachshund in for teeth cleaning.  After receiving pre-op HR dropped to 40's  Did not continue with medication ---gave atropine.  First time has had this reaction to pre-op.  Will f/u with cardiologist but what do I need to know. 
In reading your information looks like a First Degree Atrioventricular Block but will it progress?

Accepted Answer

It would be best to follow up with a Cardiologist just so you have a better picture of heart health, but without doing an ECG we cannot know for sure what is occurring. An ECG and echocardiogram would be valuable in checking Oscar’s heart and determining if they medical management is required. Regards Dr Callum Turner DVM

First-Degree Atrioventricular Block in Dogs