Yes, lyme disease COULD cause bradycardia...a slow heart rate. This disease impacts the electrolytes (potassium, sodium, calcium and magnesium) and most definitely the thyroid.So...keep the above in mind and do NOT "expect the worse" when reading the following. It is LIKELY a potassium problem (can be corrected) or a hypothyroid problem (also can be addressed).
Okay? Now for the "documentation":
"Underlying conditions list: The list of possible underlying conditions mentioned in various sources for Bradycardia includes:
Athlete - a slow heart rate can be normal in very physically fit athletes.
Heart conditions
Arrhythmias
Sinus node disease
Bradycardias
Damaged heart
Heart block
*Hypothyroidism
Hashimoto's Thyroiditis - a common form of hypothyroidism
*Hypothermia
Heat exhaustion
Anorexia nervosa
*Malnutrition
Certain medications
See also causes of slow heart beat, palpitations and bradycardia"
http://www.wrongdiagnosis.com/b/bradycardia/underly.htm
"In symptomatic patients the keys to proper decision making are correlation of symptoms to bradycardia and reversibility of causative factors (see table of causes of bradycardia).
Causes of Bradycardia Table
Causes of Bradycardia Table
Intrinsic Causes
Idiopathic degeneration (aging)
Infarction or ischemia (heart attack or reduced coronary arterial blood flow)
Infiltrative diseases
Sarcoidosis: the development of granulomatous lesions (cause unknown) in the heart, bones, lungs, etc
Amyloidosis: deposition of a near transparent waxy material due to degeneration of body tissues in chronic disease (see figures 73a, 73b, 74, 76, 77).
Hemochromatosis: deposition of iron into tissue
Collagen vascular disease (arteritis, periarteritis nodosa, etc.)
Systemic lupus erythematosis: chronic disease involving multiple organs like the skin, connective tissue, kidneys, spleen, heart, gastro intestinal tract, etc.
Rheumatoid arthritis: chronic inflammation of the joints and some organs, of unknown cause, possibly related to abnormal immune mechanisms.
Scleraderma: chronic inflammatory process causing severe increase in connective tissue in organs, skin, etc., cause unknown.
Myotonic muscular dystrophy (abnormal, inherited disease of muscles, with faulty development of degeneration of muscles)
Surgical trauma
Valve replacement
Correction of congenital heart disease
Heart transplantation
Familial diseases (inherited)
*Infectious diseases
Chagas' disease: a chronic wasting disease caused by a parasite (Trypanosoma Cruzi), prevalent in Central and South America.
Endocarditus: secondary to dental procedures causing infection in the blood stream, illicit drug injections into veins, etc.
Extrinsic Causes
Autonomically mediated syndromes (i.e. vomiting, sleeping, etc.)
Neurocardiac syncope (that's fainting)
Carotid-sinus hypersensitivity: from vagus innervation hypertonicity
Situational disturbances: coughing, micturition, defecation, vomiting
Drugs
B-Adrenergic blockers: inderal, atenolol, etc.
Calcium-channel blockers: procardia, verapamil, diliatezern
Clonidine: for hypertension
Digoxin: for heart failure, atrial fibrillation, etc.
Antiarrhythmic agents: pronestyl, quinidine, etc.
*Hypothyroidism (abnormally low thyroid hormone in the blood stream)
*Hypothermia
Neurologic disorders (affecting autonomic nervous system)
*Electrolyte imbalances
*Hypokalemia: low potassium
Hyperkalemia: high potassium "
http://www.rjmatthewsmd.com/Definitions/pop/tablefig.htm
IMO...likely hypothyroid problem or electrolyte imbalance.
P.S.
Doctors don't like to be told what to do (like most of us ;-) so...
You could say to your doctor, ``Do you think I might have low potassium?''
Then...
He would likely order a blood electrolyte test to rule that out. (Starting point.)
From there, if negative, you might want to explore the thyroid possiblity.
Men have slower (lower) pulse rates/heart beats than women...normally. My dad's was low (like yours) for MANY years, so don't freak.