Final answer:
A patient with sinus arrhythmia and a very low heart rate will experience bradycardia, which is a resting heart rate below 60 beats per minute.
Step-by-step explanation:
If your patient has sinus arrhythmia and their heart rate (HR) drops very low, they will experience bradycardia. Bradycardia is defined as a condition when the resting heart rate drops below 60 beats per minute. It is important to note that if a patient experiences symptoms such as weakness, dizziness, or chest pain along with bradycardia, it may indicate that the heart is not providing sufficient oxygenated blood to the tissues, which could require medical intervention such as a pacemaker or supplemental oxygen, depending on the underlying cause of the condition.