Final answer:
Sinus arrhythmia is a normal phenomenon in which the heart rate varies depending on the vagal tone and respiratory pattern. It is generally well tolerated by most patients and does not require immediate treatment. However, if symptoms occur, medical evaluation is necessary.
Step-by-step explanation:
A patient diagnosed with sinus arrhythmia may experience a variation in heart rate, which is dependent on vagal tone and respiratory pattern. Sinus arrhythmia is a normal phenomenon in which the heart rate increases during inhalation and decreases during exhalation. This is due to the influence of the parasympathetic nervous system, specifically the vagus nerve.
It is important to note that sinus arrhythmia is generally well tolerated by most patients and does not require immediate treatment to prevent death. In fact, sinus arrhythmia is often considered a benign condition. However, if a patient experiences symptoms such as dizziness, chest pain, or shortness of breath, they should seek medical evaluation.