The decreased heart rate can cause a decreased cardiac output resulting in symptoms such as lightheadedness, dizziness, hypotension, vertigo, and syncope. The slow heart rate may also lead to atrial, junctional, or ventricular ectopic rhythms.<unk>  is not necessarily problematic. People who practice sports may have<unk> , because their trained hearts can pump enough blood in each contraction to allow a low resting heart rate.<unk>  can also be an adaptive advantage; for example, diving seals may have a heart rate as low as 12 beats per minute, helping them to conserve oxygen during long dives.<unk>  is a common condition found in both healthy individuals and those who are considered well-conditioned athletes. Heart rates considered<unk>  vary by species; for example, in the house cat, a rate of under 120 beats per minute is abnormal. Generally, smaller species have higher and larger species lower rates.
Sinus bradycardia
Sinus arrhythmia
Automatic tachycardia
Junctional tachycardia
Hypopyon
Sinus tachycardia
Inappropriate sinus tachycardia
Paroxysmal tachycardia