Abstract: A physiological information processing apparatus includes a calculator configured to calculate a moving average value of a pulse wave transit time of a subject, and a hemodynamic parameter of the subject, using the calculated moving average value. The calculator is configured to switch a calculation target between a first hemodynamic parameter and a second hemodynamic parameter. The first hemodynamic parameter is calculated using the moving average value of a first pulse wave transit time. The second hemodynamic parameter is calculated using the moving average value of a second pulse wave transit time that is shorter than the moving average time of the first pulse wave transit time.

Abstract: A first input interface receives measured values of non-invasive blood pressure of a subject intermittently at a first frequency. A second input interface receives measured values of pulse wave transit time of the subject at a second frequency higher than the first frequency. A processor executes regression analysis processing based on the measured values received until when a measured value acquired by Nth (N is an integer that is no less than 2) measurement of the non-invasive blood pressure is received to acquire a regression equation in which the measured value is set as an explanatory variable. An information presenting device visibly presents estimated values of the non-invasive blood pressure calculated with the regression equation and the measured values, until a measured value acquired by (N+1)th measurement of the non-invasive blood pressure is received.

Abstract: A physiological information processing method includes: acquiring electrocardiogram data of a subject; acquiring pulse wave data of the subject; measuring the heart rate based on the electrocardiogram data; measuring the pulse wave transit time based on the electrocardiogram data and the pulse wave data; calculating a cardiac output based on the pulse wave transit time and heart rate which have been measured; calculating the systemic vascular resistance; and correcting the calculated cardiac output based on the systemic vascular resistance.

Abstract: A physiological information processing method includes a step of acquiring a parameter related to an amount of blood delivered from a heart of a subject or stiffness of a blood vessel of the subject; a step of displaying a trend graph indicating a change over time in the parameter in a graph display region; a step of determining a reference value of the parameter in accordance with an input operation of a user; and a step of displaying a reference guideline indicating the reference value of the parameter in the graph display region.

Abstract: A physiological information processing method includes: acquiring electrocardiogram data from a subject; acquiring pulse wave data from the subject; measuring a plurality of RR intervals based on the acquired electrocardiogram data; measuring a plurality of pulse wave transit times based on the acquired electrocardiogram data and the acquired pulse wave data; calculating, based on the measured RR intervals and the measured pulse wave transit times during a given time period, a parameter related to correlation between the measured RR intervals and the measured pulse wave transit times; and outputting the calculated parameter.

Abstract: A method includes: acquiring electrocardiogram data of a subject; acquiring pulse wave data of the subject; calculating RR intervals in a predetermined time interval based on the electro-cardiogram data; calculating pulse wave transit times (PWTT) in the predetermined time interval based on the electrocardiogram data and the pulse wave data; calculating a pulse wave transit time variation (PWTTV) in the predetermined time interval based on the PWTT in the predetermined time interval; determining whether the PWTTV in the predetermined time interval satisfies a predetermined condition associated with previously calculated PWTTV or not; calculating corrected values (PWTT?) of the PWTT based on the PWTT and the RR intervals in a case where the PWTTV does not satisfy the predetermined condition; and determining candidate values (PWTT) of the PWTT based on the PWTT and PWTT?.

Abstract: An apparatus for measuring hemodynamic parameters that can measure information relating to a cardiac contraction function of a subject with a higher accuracy and with a light burden of the subject is provided. An apparatus for measuring hemodynamic parameters includes: an electrocardiogram acquiring interface that acquires an electrocardiogram of a subject; a pulse wave acquiring interface that acquires a pulse wave of the cranio-cervical region of the subject; and a calculator that calculates information relating to cardiac functions of the subject, based on a pulse wave transit time obtained from the electrocardiogram and the pulse wave.

Abstract: A physiological information measurement method includes the steps of: measuring a first pulse wave in a first portion of a subject; measuring a second pulse wave in a second portion of the subject; acquiring a corrected waveform data set that is based on the first and second waveforms, in which at least one of the corrected waveform data set is a waveform that is corrected at least one of the first and second waveforms based on a phase difference between a first waveform corresponding to the first pulse wave, and a second waveform corresponding to the second pulse wave; and outputting a Lissajous figure based on the corrected waveform data set.

Abstract: A physiological information processing method includes: acquiring electrocardiogram data from a subject; acquiring pulse wave data from the subject; measuring a plurality of RR intervals based on the acquired electrocardiogram data; measuring a plurality of pulse wave transit times based on the acquired electrocardiogram data and the acquired pulse wave data; calculating, based on the measured RR intervals and the measured pulse wave transit times during a given time period, a parameter related to correlation between the measured RR intervals and the measured pulse wave transit times; and outputting the calculated parameter.

Abstract: A physiological information processing method includes: acquiring electrocardiogram data of a subject; acquiring pulse wave data of the subject; measuring the heart rate based on the electrocardiogram data; measuring the pulse wave transit time based on the electrocardiogram data and the pulse wave data; calculating a cardiac output based on the pulse wave transit time and heart rate which have been measured; calculating the systemic vascular resistance; and correcting the calculated cardiac output based on the systemic vascular resistance.

Abstract: Method for measuring a blood volume is provided. At least two types of respiratory variation data; for instance, data pertinent to respiratory variations in stroke volume (SVV) data, data pertinent to respiratory variations in an amplitude of a pulse wave (PAV), a pulse wave transit time (PWTT) in a respiratory cycle, and a heart rate (HR) in a predetermined time, are measured, and patient's inherent coefficients ?, ?, and K are calculated, whereby a cardiac output can be determined by an equation CO=K (?*PWTT+?)*HR.

Abstract: A biological information monitor includes: a first measuring unit which measures a pulse wave propagation time of a patient; a second measuring unit which measures a blood pressure of the patient; a calculating unit which calculates an estimated blood pressure value of the patient based on the pulse wave propagation time of the patient; a setting unit which sets a threshold; and a determining unit which compares the estimated blood pressure value with the threshold. The second measuring unit is activated to measure the blood pressure of the patient at least one of at time intervals and at a time when an operator operates the second measuring unit, and the second measuring unit is activated to measure the blood pressure of the patient by the determining unit based on the comparison result.

Abstract: A blood volume measuring method, apparatus and program for removing an artifact when used in an apparatus for analyzing respiratory variation of the stroke volume of a patient in order to determine the fluid response of the patient or adequately set artificial ventilation is provided.

Abstract: Method for measuring a blood volume is provided. At least two types of respiratory variation data; for instance, data pertinent to respiratory variations in stroke volume (SVV) data, data pertinent to respiratory variations in an amplitude of a pulse wave (PAV), a pulse wave transit time (PWTT) in a respiratory cycle, and a heart rate (HR) in a predetermined time, are measured, and patient's inherent coefficients ?, ?, and K are calculated, whereby a cardiac output can be determined by an equation CO=K(?*PWTT+?)*HR.

Abstract: In order to measure a pulse rate and an oxygen saturation of a subject who is in an exercised state, each of two pulse wave signals obtained from the subject is separated into a signal component and a noise component. A frequency spectrum of the signal component and a frequency spectrum of the noise component are obtained. It is judged whether a body motion of the subject is occurred based on the frequency spectrum of the signal component and the frequency spectrum of the noise component. A pulsation frequency is determined based on the judgment as to the body motion. The pulse rate is calculated based on the pulsation frequency. The oxygen saturation is calculated based on a ratio of spectra of the two pulse wave signals corresponding to the pulsation frequency.

Abstract: A method of measuring a blood volume, includes: reading individual specific information of a patient; estimating oxygen metabolism relating to a cardiac output of the patient; and acquiring the cardiac output based on the estimated oxygen metabolism.

Abstract: An apparatus for measuring a blood volume, includes: a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and a second calculator which calculates a second blood volume by using information on oxygen metabolism of the subject.

Abstract: A blood volume measuring method includes: acquiring data of stroke volume variation at each respiratory rate, and storing the acquired data in a first buffer; reading an N1 number of the data stored in the first buffer, from the first buffer, and storing the N1 number of the data in a second buffer; excluding a part of the data stored in the second buffer, a value of each of which exceeds a first upper limit or falls below a first lower limit, from the data stored in the second buffer, and storing the other of the data stored in the second buffer, in a third buffer; acquiring a deviation of each of the data stored in the third buffer, from a median value of the data stored in the third buffer, excluding a part of the data stored in the third buffer, the deviation of each of which exceeds a second upper limit or falls below a second lower limit, from the data stored in the third buffer, and storing the other of the data stored in the third buffer, in a fourth buffer; determining whether N2/N1 is within an allo

Abstract: A biological information monitor includes: a first measuring unit which measures a pulse wave propagation time of a patient; a second measuring unit which measures a blood pressure of the patient; a calculating unit which calculates an estimated blood pressure value of the patient based on the pulse wave propagation time of the patient; a setting unit which sets a threshold; and a determining unit which compares the estimated blood pressure value with the threshold. The second measuring unit is activated to measure the blood pressure of the patient at least one of at time intervals and at a time when an operator operates the second measuring unit, and the second measuring unit is activated to measure the blood pressure of the patient by the determining unit based on the comparison result.

Abstract: An apparatus for measuring a blood volume, includes: a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and a second calculator which calculates a second blood volume by using information on oxygen metabolism of the subject.