Method and system for detecting patient-ventilator asynchronies during mechanical ventilation

Abstract

The present invention relates to a method and system for detecting patient-ventilator asynchronies during mechanical ventilation, comprising: providing a display screen (1) with at least one screen portion (2) showing at least a first sequence of curves (3) representing the estimated muscular pressure (Pmus) of a patient over time and a second sequence of curves (4) representing the pressure delivered to the patient by the ventilator over time, wherein the at least first and second sequences of curves (3, 4) are shown adjacently, one above the other; synchronising the display of the at least first and second sequences of curves (3, 4); generating and displaying, in the screen portion (2), a marker (5) at a point corresponding to the start of each curve in the first sequence of curves (3); and generating and displaying, in the screen portion (2), a contrasting line (6) that intersects temporally corresponding points in the first sequence of curves (3) and the second sequence of curves (4).

Description

“METHOD AND SYSTEM FOR CHECKING VENTILATORY ASYNCHRONIES IN A PATIENT BEING VENTILATED BY A LUNGE VENTILATOR” FIELD OF THE INVENTION

[0001] The present invention relates to a method and a system for verifying ventilatory asynchrony in a patient being ventilated by a lung ventilator. BACKGROUND OF THE INVENTION

[0002] In mechanically ventilated patients, knowing the patient's respiratory muscle pressure (Pmus), either measured or estimated, has several advantages. On the one hand, it allows, for example, better adjustment of ventilator operating parameters and improved ventilator-patient synchrony. On the other, it allows calculation of resistance, elastance, and compliance measurements, which, in turn, makes it possible to monitor the performance of the respiratory system, monitor disease progression, and identify complications such as bronchospasm and pulmonary edema.

[0003] Patent document BR112023015812-5 discloses a method and a noninvasive device for estimating the muscle pressure of a patient being ventilated by a lung ventilator. In the technical solution taught in this document, the muscle pressure Pmus can be recorded as a curve, which, when evaluated in conjunction with the ventilator's pressure, flow, and volume measurements, allows for the detection of asynchrony.

[0004] Although this known solution represents an important advance in the correct assessment of the effort of the patient undergoing mechanical ventilation, there is a need for an optimized and efficient way to allow a healthcare professional to immediately identify the need for corrective action in the mechanical ventilation operation. OBJECTIVES OF THE INVENTION

[0005] It is one of the objectives of the present invention to provide a method for immediate verification of ventilatory asynchronies in a patient being ventilated by a lung ventilator.

[0006] It is another objective of the present invention to provide a method for comparing a representation of the muscle pressure of a mechanically ventilated patient and a representation of the pressure delivered to the patient by the pulmonary ventilator.

[0007] It is yet another objective of the present invention to provide a method for representing and immediately verifying the numerical values ​​of muscle pressure of a mechanically ventilated patient and the pressure delivered to the patient by the pulmonary ventilator and the maximum value of the patient's effort during mechanical ventilation.

[0008] It is another objective of the present invention to provide a method for comparing the onset of muscle pressure of a mechanically ventilated patient and the onset of pressure delivered to the patient by the pulmonary ventilator.

[0009] Another objective of the present invention is to provide a method for verifying, over time, the values ​​of ventilatory asynchrony in a patient being ventilated by a pulmonary ventilator.

[0010] It is yet another objective of the present invention to provide a method for representing and immediately verifying the delta value between the muscular pressure of a mechanically ventilated patient and the pressure delivered to the patient by the pulmonary ventilator and the maximum value of the patient's effort during mechanical ventilation. BRIEF DESCRIPTION OF THE INVENTION

[0011] The present invention achieves the above objectives by means of a method for verifying ventilatory asynchronies in a patient being ventilated by a lung ventilator, which comprises:

[0012] providing a display screen having at least a screen portion, the screen portion displaying at least a first sequence of curves representative of a patient's estimated muscle pressure over time instants and a second sequence of curves representative of the pressure delivered to the patient by the ventilator over time instants; wherein the at least first and second sequences of curves are displayed adjacently one above the other of the other;

[0013] synchronize the display of at least the first and second sequences of curves, so that if a given point P1 of the first sequence of curves shows a measurement of muscle pressure at an instant of time t1, a corresponding point P2 of the second sequence of curves vertically adjacent, in a straight line, to point P1 shows the measurement of the pressure delivered to the patient at the same instant of time t1;

[0014] create and display, on the screen portion, a mark at a point corresponding to the beginning of each curve of the first sequence of curves; and

[0015] create and display, on the screen portion, a contrasting line that intersects corresponding points at the same instant in time of the first sequence of curves and the second sequence of curves.

[0016] In one embodiment of the invention, the method further comprises: freezing the display of the first curve sequence and the second curve sequence; and sliding the contrasting line along the first and second curve sequences.

[0017] The method of the present invention may further comprise:

[0018] display, in fixed display positions on the screen portion, the numerical values ​​corresponding to the pressure values ​​delivered by the ventilator and the muscle pressure at a given instant in time; and

[0019] where, by sliding the contrasting line along the first and second sequences of curves, the numerical values ​​displayed correspond to the values ​​of muscle pressure and pressure delivered by the ventilator at the points corresponding to the instant of time at which the constant line crosses the first sequence of curves and the second sequence of curves.

[0020] The numerical values ​​displayed in a fixed position may also include a numerical value corresponding to a maximum muscle pressure.

[0021] The present invention also contemplates a system for verifying ventilatory asynchrony in a patient being ventilated by a pulmonary ventilator, which comprises:

[0022] a display screen having at least a screen portion, the screen portion displaying at least a first sequence of curves representing the estimated muscle pressure of a patient over instants of time and a second sequence of curves representing the pressure delivered to the patient by the ventilator over instants of time; wherein the at least first and second sequences of curves are displayed adjacently one above the other; and

[0023] a processor executing processor-executable instructions that cause the screen to:

[0024] synchronize the display of at least the first and second sequences of curves, so that if a given point P1 of the first sequence of curves shows a measurement of muscle pressure at an instant of time t1, a corresponding point P2 of the second sequence of curves vertically adjacent, in a straight line, to point P1 shows the measured pressure delivered to the patient at the same instant of time t1;

[0025] display, in the screen portion, a marking at a point corresponding to the beginning of each curve of the first sequence of curves; and

[0026] display, on the screen portion, a contrasting line that intersects corresponding points at the same instant of time of the first sequence of curves and the second sequence of curves.

[0027] The system processor of the present invention may further cause the screen to:

[0028] freeze the display of the first curve sequence and the second curve sequence; and

[0029] slide, upon user command, the contrasting line along the first and second sequences of curves.

[0030] The processor can also cause the screen to:

[0031] display, in fixed display positions on the screen portion, the numerical values ​​corresponding to the pressure values ​​delivered by the ventilator and the muscle pressure at a given instant in time; in which, by sliding the contrasting line along the first and second sequences of curves, the values The displayed numeric values ​​correspond to the values ​​of muscle pressure and pressure delivered by the ventilator at the points corresponding to the instant in time at which the constant line intersects the first sequence of curves and the second sequence of curves. The displayed numeric values ​​may also include the display of a numeric value corresponding to a maximum muscle pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be described below in more detail, with reference to the attached drawings, in which:

[0033] Figure 1 is a schematic view of the screen of a mechanical ventilator incorporating the solution according to the present invention; and

[0034] Figure 2 - is a schematic representation of a portion of the screen of a mechanical fan incorporating the solution according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention will be described below based on an embodiment of the invention illustrated in figures 1 and 2.

[0036] Figure 1 shows, schematically, screen 1 of a mechanical ventilator. Screen 1 displays parameters of a ventilator's operation, and the ventilator comprises a processor that executes software to represent the operating parameters.

[0037] To implement the present invention, the muscle pressure curve (Pmus) of a mechanically ventilated patient must be estimated, which can be done, for example, using the method disclosed in patent document BR112023015812-5.

[0038] Screen 1 has a portion 2 intended for representing the Pmus curve 3 and the pressure curve delivered to the patient by the ventilator 4, so that the two curves are represented in proximity to each other. This portion 2 of screen 1 is better illustrated in Figure 2.

[0039] In the embodiment shown in figure 2, the representation comprises a continuous sequence of curves 3 and 4 over a time interval and the sequences of curves 3 and 4 are represented adjacently one above the other. other.

[0040] It should be noted that curves 3 and 4 are formed by the Pmus and pressure values ​​estimated or measured over time, so that the sequences of curves 3 and 4 are dynamic curves over time.

[0041] In order to allow the identification of ventilatory asynchronies, the representation of the Pmus curve is performed so that there is a marking that allows the immediate verification of ventilatory asynchronies in a patient being ventilated by a pulmonary ventilator.

[0042] Thus, the representation software creates a 5 mark at the starting point of the muscle pressure curve (Pmus). This mark allows the healthcare professional to quickly identify the onset of the patient's effort. Immediate identification of such an onset is crucial because the patient's effort should trigger the start of inspiration by the mechanical ventilator. Ventilatory asynchrony occurs when the patient exerts a respiratory effort at a time when the ventilator is not delivering ventilation pressure. In other words, the patient's ventilator effort was in vain.

[0043] The representation software is also capable of synchronizing the display of the sequences of curves 3 and 4, so that if a certain point P1 of curve 3 shows the Pmus measurement at an instant t1, the corresponding point P2 of curve 4 vertically above, in a straight line, from point P1 shows the pressure measurement at the same instant t1.

[0044] Thus, the healthcare professional can promptly identify ventilatory asynchrony by viewing the point on the pressure curve that corresponds to the point on the Pmus curve at the same time. In this sense, screen portion 2, with the sequences of curves 3 and 4 arranged adjacently, one above the other, allows for the immediate visualization of the corresponding points together.

[0045] Furthermore, the representation software is programmed to display a contrast line 6 with the sequences of curves 3 and 4. The contrast line 6 is a straight vertical line that is displayed so that it intersects both the sequence of Pmus curves 3 and the sequence of curves of the pressure delivered to the patient by pulmonary ventilator 4 at corresponding measurement points at the same instant in time.

[0046] Thus, contrasting line 6 helps in the comparison between curves 3 and 4, further facilitating the immediate verification of any ventilatory asynchrony.

[0047] The screen portion 2 further comprises locations for the fixed display of the numerical values ​​of the pressure delivered by the ventilator 7, of the Pmus 8 and of the maximum value of the Pmus 9. In this sense, in one embodiment of the invention, the maximum value of the Pmus displayed is the maximum value per respiratory cycle. Thus, the healthcare professional can quickly check the values ​​being represented by the point of the represented curves.

[0048] Furthermore, the representation software may be programmed to freeze the sequence of curves being displayed on screen portion 2. After freezing the sequence of curves, the healthcare professional may interact with the screen to slide the contrasting vertical line 6 along curves 3 and 4. Such sliding may be performed by touching and dragging line 6 or by pressing a virtual right and left arrow button when screen 1 is a touchscreen, or by pressing a physical dial or push-button. In one embodiment of the invention, a touchscreen and a physical dial or push-button may be used simultaneously.

[0049] When the contrasting vertical line 6 is slid along the curve sequences 3 and 4, the numerical values ​​7, 8, and 9 shown in the screen portion 2 are the values ​​corresponding to the points of the curve sequences 3 and 4 crossed by the vertical line 6. This feature of the present invention allows the healthcare professional to analyze the curve sequences 3 and 4 over time, enabling a better analysis of ventilatory asynchronies and also allowing the healthcare professional to check the delta between the Pmus and the pressure delivered by the ventilator at the point where the vertical line is located. Thus, the healthcare professional can seek an optimal delta, ensuring safe and effective ventilation for the patient.

[0050] Having described an example of a preferred embodiment of the present invention, it should be understood that the scope of the present invention encompasses others possible variations of the inventive concept described, limited only by the content of the claims, including possible equivalents.

Claims

CLAIMS 1. Method for verifying ventilatory asynchronies in a patient being ventilated by a lung ventilator, characterized by the fact that it comprises: providing a display screen (1) with at least one screen portion (2), the screen portion (2) displaying at least a first sequence of curves (3) representative of the muscle pressure (Pmus) of a patient estimated over instants of time and a second sequence of curves (4) representative of the pressure delivered to the patient by the lung ventilator over instants of time; in which the at least first and second sequences of curves (3, 4) are represented adjacently one above the other;synchronizing the display of at least the first and second sequences of curves (3, 4), so that if a given point P1 of the first sequence of curves (3) shows a measurement of muscle pressure at an instant of time t1, a corresponding point P2 of the second sequence of curves (4) vertically adjacent, in a straight line, to point P1 shows the measurement of the pressure delivered to the patient at the same instant of time t1; creating and displaying, in the screen portion (2), a marking (5) at a point corresponding to the beginning of each curve of the first sequence of curves (3); and creating and displaying, in the screen portion (2), a contrasting line (6) that crosses corresponding points at the same instant of time of the first sequence of curves (3) and of the second sequence of curves (4).; 2. Method according to claim 1, characterized in that it further comprises: freezing the display of the first sequence of curves (3) and the second sequence of curves (4); and sliding the contrasting line (6) along the first and second sequences of curves (3, 4).

3. Method according to claim 2, characterized by the fact that it further comprises: displaying, in fixed display positions on the screen portion (2), the numerical values ​​corresponding to the pressure values ​​delivered by the ventilator (7) and the muscle pressure (8) at a given instant in time; and in which, by sliding the contrasting line (6) along the first and second sequences of curves (3, 4), the numerical values ​​displayed correspond to the values ​​of muscle pressure and pressure delivered by the ventilator at the points corresponding to the instant in time in which the constant line crosses the first sequence of curves (3) and the second sequence of curves (4).

4. Method according to claim 3, characterized in that the step of displaying, at fixed display positions on the screen portion (2), the numerical values ​​further comprises displaying a numerical value corresponding to a maximum muscle pressure.

5. System for checking ventilatory asynchronies in a patient being ventilated by a lung ventilator, characterized by the fact that it comprises: a display screen (1) with at least one screen portion (2), the screen portion (2) displaying at least a first sequence of curves (3) representative of the muscle pressure (Pmus) of a patient estimated over instants of time and a second sequence of curves (4) representative of the pressure delivered to the patient by the lung ventilator over instants of time; in which the at least first and second sequences of curves (3, 4) are represented adjacently one above the other;and a processor executing processor-executable instructions that cause the screen (1): to synchronize the display of at least the first and second sequences of curves (3, 4), so that if a given point P1 of the first sequence of curves (3) shows a measurement of muscle pressure at an instant of time t1, a corresponding point P2 of the second sequence of curves (4) vertically adjacent, in a straight line, to point P1 shows the measured pressure delivered to the patient at the same instant of time t1; display, on the screen portion (2), a marking (5) at a point corresponding to the beginning of each curve of the first sequence of curves (3); and display, on the screen portion (2), a contrasting line (6) that crosses corresponding points at the same instant of time of the first sequence of curves (3) and the second sequence of curves (4).

6. System according to claim 5, characterized in that the processor executing processor-executable instructions causes the screen (1): to freeze the display of the first curve sequence (3) and the second curve sequence (4); and to slide, upon a command by the user, the contrasting line (6) along the first and second curve sequences (3, 4).

7. System according to claim 6, characterized in that the processor executing processor-executable instructions causes the screen (1) to display, at fixed display positions in the screen portion (2), numerical values ​​corresponding to the values ​​of pressure delivered by the ventilator (7) and muscle pressure (8) at a given instant of time; and in which, by sliding the contrasting line (6) along the first and second sequences of curves (3, 4), the numerical values ​​displayed correspond to the values ​​of muscle pressure and pressure delivered by the ventilator at the points corresponding to the instant of time in which the constant line crosses the first sequence of curves (3) and the second sequence of curves (4).

8. System according to claim 7, characterized in that the display, at fixed display positions on the screen portion (2), of the numerical values ​​further comprises the display of a numerical value corresponding to a maximum muscle pressure.

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