12 results about "Fluid responsiveness" patented technology

The invention relates to an apparatus for determining an indicator, which is representative for a physiological parameter of a patient like a fluid responsiveness parameter, based on a pulse signal. The apparatus determines a) a respiratory pulse variation signal (r0) corresponding to pulse variations caused by ventilation or respiration induced heart-lung interaction based on the pulse signal and b) a systolic part of the respiratory pulse variation signal, which corresponds to a time period in which an increasing or decreasing applied pressure passed the systolic arterial pressure of the patient and which therefore is prone to comprising an artifact. Moreover, the respiratory pulse variation signal is modified such that the determined systolic part of the respiratory pulse variation signal is corrected, wherein the indicator is determined based on the measured pulse signal and the modified respiratory pulse variation signal. This procedure allows for a more accurate determination of the indicator.

A system for determining fluid responsiveness of a patient includes a hemodynamic sensor that produces, on an ongoing basis, a hemodynamic sensor signal representative of a right ventricular pressure (RVP) waveform of the patient and an integrated hardware unit. The integrated hardware unit includes a processor, a memory, and a display including a user interface. The memory includes instructions that, when executed by the processor, cause the system to receive the hemodynamic sensor signal representative of the RVP waveform of the patient, convert the RVP waveform of the patient into an estimate of a blood flow waveform of the patient, determine a stroke volume variation (SVV) of the patient based on the estimate of the blood flow waveform of the patient to generate a determined SVV, and output, to the display, an indication of a fluid responsiveness status of the patient that is based on the determined SVV.

A system and method for determining a patient's fluid-dependent hemodynamic responsiveness. The system comprises a processor configured to receive one or more of: one or more patient characteristics, one or more surgery characteristics, or one or more measured patient blood parameters. The processor is further configured to receive fluid challenge characteristics for a fluid challenge administered intravenously to the patient, and one or more measurements indicative of the patient heart function before and after the administration of the fluid challenge. The processor determines the patient blood volume (BV) within the patient's central blood compartment, before and after the administration of the fluid challenge, based on the received fluid challenge characteristics and the received one or more of: one or more patient characteristics, one or more surgery characteristics, or one or more measured patient blood parameters. The processor then calculates the relationship between the change in patient blood volume (ABV) and the change in patient heart function.

A method for monitoring a patient and providing a fluid responsiveness indicator of the patient includes receiving, by a hemodynamic monitor, sensed hemodynamic data representative of an arterial pressure waveform of the patient; performing, by the hemodynamic monitor, waveform analysis of the hemodynamic data to determine a plurality of hemodynamic parameters; and determining, by the hemodynamic monitor based on the plurality of parameters, an indicator representing fluid responsiveness status for the patient.

The invention discloses a hydration-induced shrinkage medical dressing and a preparation method and application thereof, the design is ingenious, a hydration-induced shrinkage film is adopted as a composite framework of a driving layer and a polyacrylic acid-N-hydroxysuccinimide ester (PAA-NHS ester) adhesion layer, functional modularization and synergism are achieved, and the application range is wide. The hydration-induced shrinkage medical dressing has excellent mechanical properties, intelligent fluid responsiveness and strong wet tissue adhesion, can intelligently respond to wound exudate and spontaneously generate physical shrinkage, can actively promote wound closure, remarkably improves the wound repair effect, and has a good application prospect. And active mechanical closing of the wound surface is realized without external source energy driving.

A method for deriving a measure of PPG variability which is indicative of fluid responsiveness. The PPG signal is processed with an adaptive re-sampling algorithm which re-samples the signal with a sampling density which is a function of instantaneous pulse rate. When the PPG signal is subsequently transformed with a discrete frequency-domain transform such as an FFT, the resulting frequency spectrum reflects a variability of the sample in which the FM contribution is largely eliminated. This provides variability information which is more reflective of the AM contribution which is the dominant contribution associated with respiration.

A system (100) for determining a fluid responsiveness parameter, FRP, for a patient is presented, wherein the determined fluid responsiveness parameter is a systolic pressure variation (SPV) or a pulse pressure variation (PPV) that comprises units (101, 102, 103) for providing a respiratory rate, a heart rate and a measured blood pulsation signal indicative of a series of blood pulses of a patient. The system further comprises a unit (104) for determining, a first processed signal (env_up) based on the blood pulsation signal, wherein the first processed signal is indicative of an upper envelope of the blood pulsation signal, and a second processed signal (env_down) based on the blood pulsation signal, wherein the second processed signal is indicative of a lower envelope of the blood pulsation signal, and a unit (105) for determining the FRP by a) identifying, based on the first and second processed signals, first FRP determination signals (baseline_up, baseline_down) corresponding to the first and second processed signals in a spectral range up to the respiratory rate, and second FRP determination signals (ripple_up, ripple_down) corresponding to the first and second processed signals at the respiratory rate and any of its harmonics up to the heart rate, and b) determining the FRP based on the first and the second FRP determination signals.

Techniques for predicting fluid responsiveness or fluid unresponsiveness are described. A processor can determine a first prediction of fluid responsiveness or unresponsiveness based on a plethysmograph variability parameter associated with a plethysmograph waveform, and can determine a second prediction of fluid responsiveness or unresponsiveness based on a fluid responsiveness parameter that is associated with an elevation of one or more limbs of the patient. The processor can determine an overall prediction of fluid responsiveness or unresponsiveness based on the first and / or second predictions. Based on overall prediction, the processor can cause administration of fluids and / or termination of administration of fluids.

The present disclosure relates to a method for assessing fluid responsiveness of a patient (3) connected to a breathing apparatus (2) providing mechanical ventilation to the patient (3). The method comprises the steps of monitoring a respiratory pressure of the patient (3), controlling a pneumatic unit (17) of the breathing apparatus (3) to provide baseline ventilation of the patient (3) with alternating inspiration phases and expiration phases during a period of baseline ventilation, monitoring at least one hemodynamic parameter related to fluid responsiveness of the patient (3), aborting baseline ventilation and initiating an end-expiratory fluid responsiveness assessment [EEFRA] period at an end of an expiration phase, and determining a degree of fluid responsiveness of the patient (3) based on a change in the at least one monitored hemodynamic parameter between the period of baseline ventilation and the EEFRA period. The method further comprises the step of dynamically controlling the pneumatic unit (17) during the EEFRA period based on the monitored respiratory pressure to counteract a change in an intrathoracic pressure of the patient (3) during spontaneous respiratory efforts by the patient (3).

The disclosure relates to a method for assessing fluid responsiveness of a patient (3) connected to a breathing apparatus (2) providing mechanical ventilation to the patient (3). The method comprises the steps of initiating a fluid responsiveness assessment [FRA] period for assessing a degree of fluid responsiveness of the patient (3), determining a pulse pressure variation [PPV] and / or a stroke volume variation [SVV] of the patient (3) during the FRA period, and presenting information indicative of the fluid responsiveness of the patient (3) to an operator of the breathing apparatus (1) based on the determined PPV and / or SVV. The method further comprises the steps of determining a heartrate [HR] or pulse rate [PR] of the patient (3) during baseline ventilation of the patient (3) prior to the FRA period, calculating recommended FRA ventilation settings for the FRA period based on the determined HR and / or PR, wherein the recommended FRA ventilation settings comprises a recommended respiratory rate [RRFRA] and / or a recommended inspiratory-expiratory ratio [I:EFRA], and ventilating the patient (3) using the recommended FRA ventilation settings during the FRA period.

Techniques for predicting fluid responsiveness or fluid unresponsiveness are described. A processor can determine a first prediction of fluid responsiveness or unresponsiveness based on a plethysmograph variability parameter associated with a plethysmograph waveform, and can determine a second prediction of fluid responsiveness or unresponsiveness based on a fluid responsiveness parameter that is associated with an elevation of one or more limbs of the patient. The processor can determine an overall prediction of fluid responsiveness or unresponsiveness based on the first and / or second predictions. Based on overall prediction, the processor can cause administration of fluids and / or termination of administration of fluids.

A liquid reactivity detection device and method. The liquid reactivity detection device includes: a breathing signal acquisition module, a hemodynamic signal acquisition module and a liquid reactivity detection module. The breathing signal acquisition module and the hemodynamic signal acquisition module work in cases where the subject is in any one of the following breathing modes: a spontaneous breathing mode, a spontaneous breathing combined with mechanical ventilation mode, and a mechanical ventilation mode. The hemodynamic signal acquisition module is configured to acquire at least one hemodynamic signal of the subject. The breathing signal acquisition module is configured to acquire at least one breathing signal of the subject. The liquid reactivity detection module is configured to determine the liquid reactivity of the subject according to the breathing signal and the hemodynamic signal.