A method for determining a calibrated aortic pressure waveform with cardiovascular waveform features preserved, the method comprising the steps: providing an inflatable brachial cuff having a pressure sensor to measure pressure within the brachial cuff, said pressure sensor being adapted to output an analog signal; providing a digital signal processor that is adapted to receive the analog signal from the pressure sensor and to output a digital brachial cuff signal representing the patient's brachial cuff volumetric displacement waveform, wherein the output digital brachial cuff signal is a low pass and high pass filtered signal that preserves the cardiovascular waveform features of the patient's brachial cuff volumetric displacement waveform; measuring at least the patient's brachial systolic pressure (SP B) and brachial diastolic pressure (DP B) using the brachial cuff in an oscillometric mode; inflating the brachial cuff around a patient's upper arm to a pressure within a predetermined pressure range, wherein the predetermined pressure range is selected from a range that is one of less than the measured DP B, between the measured DP B and the measured SP B, and above the measured SP B; maintaining the brachial cuff at said pressure and recording the patient's brachial cuff volumetric displacement waveform using the digital signal processor; using at least two of systolic pressure (SP B), mean pressure (MP B) and diastolic pressure (DP B) to calibrate the recorded brachial cuff waveform; and using one or more generalized transfer functions to convert the recorded and calibrated brachial cuff volumetric displacement waveform with its cardiovascular waveform features preserved to a calibrated aortic pressure waveform with its cardiovascular waveform features preserved; wherein said one or more generalized transfer functions represent the harmonic ratio in amplitude and phase between the brachial cuff displacement waveform and the aortic pressure waveform to transform the calibrated brachial cuff volumetric displacement waveform to a calibrated aortic pressure waveform; the used one or more generalized transfer functions being specific for the selected predetermined pressure range. providing an inflatable brachial cuff having a pressure sensor to measure pressure within the brachial cuff, said pressure sensor being adapted to output an analog signal; providing a digital signal processor that is adapted to receive the analog signal from the pressure sensor and to output a digital brachial cuff signal representing the patient's brachial cuff volumetric displacement waveform, wherein the output digital brachial cuff signal is a low pass and high pass filtered signal that preserves the cardiovascular waveform features of the patient's brachial cuff volumetric displacement waveform; measuring at least the patient's brachial systolic pressure (SP B) and brachial diastolic pressure (DP B) using the brachial cuff in an oscillometric mode; inflating the brachial cuff around a patient's upper arm to a pressure within a predetermined pressure range, wherein the predetermined pressure range is selected from a range that is one of less than the measured DP B, between the measured DP B and the measured SP B, and above the measured SP B; maintaining the brachial cuff at said pressure and recording the patient's brachial cuff volumetric displacement waveform using the digital signal processor; using at least two of systolic pressure (SP B), mean pressure (MP B) and diastolic pressure (DP B) to calibrate the recorded brachial cuff waveform; and using one or more generalized transfer functions to convert the recorded and calibrated brachial cuff volumetric displacement waveform with its cardiovascular waveform features preserved to a calibrated aortic pressure waveform with its cardiovascular waveform features preserved; maintaining the brachial cuff at said pressure and recording the patient's brachial cuff volumetric displacement waveform using the digital signal processor; using at least two of systolic pressure (SP B), mean pressure (MP B) and diastolic pressure (DP B) to calibrate the recorded brachial cuff waveform; and using one or more generalized transfer functions to convert the recorded and calibrated brachial cuff volumetric displacement waveform with its cardiovascular waveform features preserved to a calibrated aortic pressure waveform with its cardiovascular waveform features preserved; wherein said one or more generalized transfer functions represent the harmonic ratio in amplitude and phase between the brachial cuff displacement waveform and the aortic pressure waveform to transform the calibrated brachial cuff volumetric displacement waveform to a calibrated aortic pressure waveform; the used one or more generalized transfer functions being specific for the selected predetermined pressure range.