Monitoring of a patient that allows the blood pressure to be recorded at regular intervals under normal living and working conditions and is useful to determine to what degree a patient's blood pressure falls at night compared to daytime values: Ambulatory blood pressure monitoring consists of prolonged blood pressure readings that are made while a patient does normal daily activities that will allow quantitative analyses of high blood pressure loads over different times and which can help distinguish between types of hypertensions; as well as, to determine the effectiveness of antihypertensive therapies.