In hypotension, what is the definition of low systolic blood pressure?

In the context of hypotension, low systolic blood pressure is defined as a reading of less than 90 mmHg. This measurement is crucial because it indicates the pressure in the arteries during the contraction of the heart, which is significant for assessing overall cardiovascular health. When systolic blood pressure falls below 90 mmHg, it may lead to insufficient blood flow to vital organs, thereby potentially causing symptoms such as dizziness, fainting, or even shock. This cutoff helps healthcare professionals identify instances where intervention may be necessary to restore adequate blood pressure and ensure proper organ perfusion. The other values presented in the choices are not standardized thresholds for defining hypotension, which is why they are considered incorrect in this context.