A method for monitoring blood pressure of a patient, comprising - using a volume clamp method, continuously measuring a patient's arterial blood pressure with a continuous first arterial blood pressure measurement system; - calibrating the continuous first arterial blood pressure measurement system using a second arterial blood pressure measurement system measuring systolic arterial blood pressure of the patient, the calibrating comprising the consecutive steps of: - placing around a finger of the patient a finger cuff that includes an inflatable bladder and a pulsatility sensor that detects arterial pulsatility in the finger of the patient; - inflating the bladder of the finger cuff until the finger cuff applies a first pressure to the finger, the first pressure being greater than the systolic pressure to be measured; - deflating the bladder of the finger cuff until the finger cuff applies a second pressure to the finger, the second pressure being less than the systolic pressure to be measured; - monitoring the arterial pulsatility in the finger with the pulsatility sensor; and - obtaining a measurement of the systolic arterial blood pressure based on pressure applied to the finger by the finger cuff and the arterial pulsatility in the finger; the method further comprising: - using the measurement of the systolic arterial blood pressure obtained to calibrate the first arterial blood pressure measurement system; and - the first arterial blood pressure measurement system and the second arterial blood pressure measurement system either using two different finger cuffs (612, 622) to continuously measure the patient's arterial blood pressure and to measure the systolic arterial blood pressure or using a single finger cuff, switching between two modes to continuously measure the patient's arterial blood pressure or to measure the systolic arterial blood pressure. - using a volume clamp method, continuously measuring a patient's arterial blood pressure with a continuous first arterial blood pressure measurement system; - calibrating the continuous first arterial blood pressure measurement system using a second arterial blood pressure measurement system measuring systolic arterial blood pressure of the patient, the calibrating comprising the consecutive steps of: - placing around a finger of the patient a finger cuff that includes an inflatable bladder and a pulsatility sensor that detects arterial pulsatility in the finger of the patient; - inflating the bladder of the finger cuff until the finger cuff applies a first pressure to the finger, the first pressure being greater than the systolic pressure to be measured; - deflating the bladder of the finger cuff until the finger cuff applies a second pressure to the finger, the second pressure being less than the systolic pressure to be measured; - monitoring the arterial pulsatility in the finger with the pulsatility sensor; and - obtaining a measurement of the systolic arterial blood pressure based on pressure applied to the finger by the finger cuff and the arterial pulsatility in the finger; the method further comprising: - using the measurement of the systolic arterial blood pressure obtained to calibrate the first arterial blood pressure measurement system; and - the first arterial blood pressure measurement system and the second arterial blood pressure measurement system either using two different finger cuffs (612, 622) to continuously measure the patient's arterial blood pressure and to measure the systolic arterial blood pressure or using a single finger cuff, switching between two modes to continuously measure the patient's arterial blood pressure or to measure the systolic arterial blood pressure. - placing around a finger of the patient a finger cuff that includes an inflatable bladder and a pulsatility sensor that detects arterial pulsatility in the finger of the patient; - inflating the bladder of the finger cuff until the finger cuff applies a first pressure to the finger, the first pressure being greater than the systolic pressure to be measured; - deflating the bladder of the finger cuff until the finger cuff applies a second pressure to the finger, the second pressure being less than the systolic pressure to be measured; - monitoring the arterial pulsatility in the finger with the pulsatility sensor; and - obtaining a measurement of the systolic arterial blood pressure based on pressure applied to the finger by the finger cuff and the arterial pulsatility in the finger; the method further comprising: - using the measurement of the systolic arterial blood pressure obtained to calibrate the first arterial blood pressure measurement system; and - the first arterial blood pressure measurement system and the second arterial blood pressure measurement system either using two different finger cuffs (612, 622) to continuously measure the patient's arterial blood pressure and to measure the systolic arterial blood pressure or using a single finger cuff, switching between two modes to continuously measure the patient's arterial blood pressure or to measure the systolic arterial blood pressure.