SLOW HEART RATE (BRADYCARDIA) — ENDOCRINE LINK
WHAT THIS SYMPTOM USUALLY MEANS
A slow heart rate may occur with hypothyroidism, Addison’s disease, or severe metabolic imbalance.
MOST COMMON CAUSES
MILD
• Athletic conditioning
• Deep sleep
MEDICAL
• Hypothyroidism
• Addison’s disease
• High potassium (hyperkalemia)
• Heart disease
• Neurological disease
EMERGENCY
• Addisonian crisis
• Severe hyperkalemia
• Heart block
RED FLAGS
• Collapse
• Vomiting + weakness
• Pale gums
• Slow heart rate + dehydration
• If you’re unsure, treat it as urgent.
AT-HOME CARE
• Keep pet warm
• Avoid strenuous activity
These do not replace urgent care.
WHAT A VETERINARIAN WILL CHECK
• ECG
• Electrolytes
• Thyroid panel
• Cortisol
• Blood pressure
MOST LIKELY DIAGNOSES
• Hypothyroidism
• Addison’s
• Hyperkalemia
• Heart conduction disease
WHEN TO SCHEDULE
• Immediately: collapse or severe weakness
• 24 hrs: persistent low heart rate
LONGEVITY IMPACT
Endocrine-driven bradycardia is a correctable longevity threat if caught early.
LONGEVITY CONSULT
Recommended for all endocrine-related cardiovascular signs.