A normal cardiac rhythm in dogs is a steady, coordinated heartbeat regulated by electrical signals originating from the heart’s natural pacemaker—the sinoatrial (SA) node. This rhythm ensures efficient blood flow to vital organs. When these signals are disrupted, the heart may beat too slow, a condition known as bradyarrhythmia.
Specialist in Veterinary Cardiology, Dr. Samantha Gomart, mentioned that bradyarrhythmias can result from conditions like sick sinus syndrome or atrioventricular (AV) block, where electrical impulses are delayed or blocked. These slow rhythms reduce cardiac output, meaning the heart cannot pump enough blood to meet the body’s needs. As a result, affected dogs may experience weakness, exercise intolerance, or even fainting episodes. Over time, the strain on the heart can lead to congestive heart failure (CHF), where fluid accumulates in the lungs or abdomen, causing coughing and difficulty breathing.
