Tachycardia can lead to an increase in low blood pressure: firstly, in tachycardia, the heart rate increases, myocardial contractility increases, cardiac conduction velocity increases, and sympathetic tone increases, which causes a rise in blood pressure and an increase in myocardial oxygen consumption. Therefore, for patients with a previous history of hypertension, it is particularly likely to lead to increased low pressure. In addition, when the heart rate increases, there is an imbalance between oxygen supply and demand in the myocardial cells, leading to a series of clinical symptoms such as chest tightness, shortness of breath, palpitations, and discomfort in the precordial area, which can further lead to an increase in blood pressure. In addition, when the heart rate is accelerated, there is also a dysregulation of the neural-fluid-endocrine system, which can lead to a further increase in blood pressure, and there is also an activation of the renin-angiotensin-aldosterone system, which can lead to a rise in the lack of teeth.