JP7130228B2 - typology discriminator - Google Patents

Description

The present invention relates to a technique for discriminating types of nocturnal hypoxemia.

The number of practitioners who receive home oxygen therapy (HOT), which is a treatment method in which oxygen is inhaled at home, is increasing year by year. For example, patients with chronic obstructive pulmonary disease (COPD), aftereffects of pulmonary tuberculosis, interstitial pneumonia, heart disease, thoracic/spinal column disease, neuromuscular disease, etc. may receive this home oxygen therapy.

Patients receiving home oxygen therapy may develop hypoxemia, which is a state in which oxygen in arterial blood is insufficient during sleep, such as at night. Oxygen therapy is often used as a response during sleep. Specifically, a pulse oximeter is attached to a fingertip or ear to measure the pulse rate and percutaneous arterial oxygen saturation (SpO ₂ ). According to the value of percutaneous arterial blood oxygen saturation obtained, the amount and concentration of oxygen to be supplied are determined, and oxygen concentrators and oxygen cylinders are used to supply the determined value of concentrated oxygen to the patient. It has been subjected.

Although we believe that there are no related publications, Patent Document 1 discloses a device that detects the occurrence of Cheyne-Stokes respiration by detecting a respiratory pattern from a respiratory signal and calculating a frequency spectrum.

Japanese translation of PCT publication No. 2008-525060

However, there are cases in which the patient's symptoms are not appropriately treated. Specifically, this is the case where a patient who needs oxygen therapy with a constant oxygen flow rate during the day is receiving oxygen therapy with a constant oxygen flow rate at night.

Although there are multiple types of nocturnal hypoxemia, this is complicated because one patient may include multiple types. Therefore, there is a limit to distinguishing the type of nocturnal hypoxemia based only on gross evaluation of findings by the examining physician. In addition, it is desirable to change the treatment method flexibly depending on the state of hypoxemia, but it is very difficult for doctors and nurses to constantly monitor the measurement results.

In addition, when trying to discriminate the type of nocturnal hypoxemia with a device, it is conceivable to make a comprehensive judgment by sensing not only oxygen saturation but also brain waves and eyeball movements. There are also concerns about the burden on patients at times and the inability to obtain accurate data.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a type discriminating apparatus capable of discriminating the type of nocturnal hypoxemia based only on information on oxygen saturation.

In order to achieve the above object, a type discriminating apparatus as one aspect of the present invention provides oxygen saturation information that acquires oxygen saturation information, which is information about temporal changes in arterial blood oxygen saturation during sleep of a subject. an acquisition unit, a conversion unit that frequency-converts oxygen saturation information within a predetermined first period, a power extraction unit that extracts power within a predetermined frequency range based on the data converted by the conversion unit; a time calculation unit for calculating an excess period that is the total time during which the power extracted by the power extraction unit exceeds the first threshold in a predetermined second period longer than one period, and the excess period calculated by the time calculation unit is A judgment unit that judges that the type is the intermittent type when it is equal to or greater than a second threshold, and a notification unit that informs the result of the judgment unit.

According to this, it is possible to determine whether the subject's nocturnal hypoxemia is of the intermittent type or non-intermittent type only by acquiring the change in arterial blood oxygen saturation over time.

Also, a baseline extraction unit for extracting a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit, and a third threshold or less for the extracted baseline oxygen saturation and a period measuring unit that measures a duration that is the period detected by the detecting unit, and the determining unit determines that, if the duration is equal to or greater than a fifth threshold, the continuous type You may judge that it is a type.

According to this, it is possible to determine whether the type of nocturnal hypoxemia of the subject is persistent or non-persistent.

Also, a baseline extraction unit for extracting a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit, and a third threshold or less for the extracted baseline oxygen saturation and a period measurement unit that measures a duration that is the period detected by the detection unit, and the determination unit measures the duration that is greater than or equal to a sixth threshold and less than a seventh threshold. However, if it occurs the number of times equal to or greater than the ninth threshold with an interval equal to or greater than the eighth threshold, it may be determined that the type is an irregular type.

According to this, it is possible to determine whether the type of nocturnal hypoxemia of the subject is irregular or non-irregular.

Further, the oxygen saturation information acquisition unit may acquire the oxygen saturation information from a pulse oximeter attached to the subject.

According to this, oxygen saturation information can be acquired only by attaching a lightweight device to the fingertip or ear, and the burden on the subject can be reduced.

The determination unit may determine the type based on oxygen saturation information from a predetermined period of time to the present, and the notification unit may immediately notify the result of the determination unit.

According to this, the determination result can be reported in real time, and the treatment policy can be changed immediately in response to the occurrence of symptoms.

It should be noted that executing a program for causing a computer to realize each process executed by the type discrimination device also corresponds to the implementation of the present invention. Of course, carrying out the recording medium on which the program is recorded also corresponds to carrying out the present invention.

The type of nocturnal hypoxemia can be determined only by obtaining oxygen saturation information, which is information about temporal changes in arterial blood oxygen saturation during sleep of the subject.

It is a block diagram which shows the functional structure of a type discrimination|determination apparatus with a mechanism structure. It is a flowchart which shows operation|movement of a type discrimination apparatus. 4 is a graph showing oxygen saturation data and the analysis state of the data in multiple stages. FIG. 11 is a graph showing another analysis state of oxygen saturation data; FIG.

The inventor acquires percutaneous arterial blood oxygen saturation waveform data for target patients at the hospital or related facilities where the inventor works, analyzes the data, and increases the N number of target patients. We have found a causal relationship between the treatment judged by the doctor and the analysis results.

As a result, conventionally, simple percutaneous treatment can be applied to target patients in cases where treatment during sleep, such as at night, was uniformly performed, and there were cases where treatment effects were not obtained for the patient. We found that better treatment can be given to each patient by acquiring data on arterial blood oxygen saturation and mechanical analysis.

Furthermore, when subject patients acquire percutaneous arterial blood oxygen saturation waveform data for a long period of time and analyze them at regular time intervals, it is possible to determine the type of nocturnal hypoxemia accurately and with high reproducibility. I found it possible.

Next, an embodiment of a type discriminating device according to the present invention will be described with reference to the drawings. It should be noted that the embodiments described below are all comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in independent claims representing the highest concept will be described as arbitrary constituent elements.

In addition, the drawings are schematic diagrams in which emphasis, omissions, and ratios are appropriately adjusted in order to illustrate the present invention, and may differ from actual shapes, positional relationships, and ratios.

FIG. 1 is a block diagram showing the functional configuration of the type discriminating device together with the mechanical configuration. As shown in the figure, the type discriminating device 100 is a device for discriminating the type of nocturnal hypoxemia from the temporal change in arterial blood oxygen saturation during sleep of the subject, and causes a processor to execute a program. A plurality of processing units are provided. The type discrimination device 100 includes an oxygen saturation information acquisition section 110, a conversion section 120, a power extraction section 130, a time calculation section 140, a determination section 150, and a notification section 160 as processing sections. Further, in the case of the present embodiment, the type discrimination device 100 further includes a baseline calculation unit 170 , a detection unit 180 and a period measurement unit 190 . A pulse oximeter 200 , a display device 210 , and a storage device 220 are connected to the type discrimination device 100 .

The oxygen saturation information acquisition unit 110 is a processing unit that acquires oxygen saturation information, which is information about temporal changes in arterial blood oxygen saturation during sleep of the subject. The information acquisition method of the oxygen saturation information acquisition unit 110 is not particularly limited. For example, a method of acquiring information via a network such as the Internet or a LAN, or a method of acquiring information by reading information recorded on a recording medium. Methods and the like can be exemplified. In the case of the present embodiment, the oxygen saturation information acquisition unit 110 is communicably connected to the pulse oximeter 200, and obtains the oxygen saturation acquired from the pulse oximeter 200 in real time as oxygen saturation information together with time-lapse information. Store in storage device 220 .

Here, the oxygen saturation information measured by the pulse oximeter 200 is information on the percutaneous arterial blood oxygen saturation, which substantially matches the arterial blood oxygen saturation. The data output from 200 is processed as arterial blood oxygen saturation. A pulse oximeter 200 is preferred because it can provide an approximation of arterial oxygen saturation in real time.

The conversion unit 120 is a processing unit that frequency-converts oxygen saturation information within a predetermined first period. The method of frequency conversion is not particularly limited, and conversion to frequency domain information by a parametric method using an AR model can be exemplified. In the case of the present embodiment, the conversion unit 120 performs Fourier transform on the oxygen saturation information within the first period using fast Fourier transform to convert it into frequency domain information.

Although the first period is not particularly limited, it is preferable to set it to a period in which significant results can be derived in consideration of a person's sleep time. In addition, since a certain amount of data is required for fast Fourier transform, the first period is preferably about 600 seconds, for example. Note that the first period corresponds to the window width for fast Fourier transform.

The power extraction unit 130 is a processing unit that extracts power within a predetermined frequency range based on the data converted by the conversion unit 120 .

Although the frequency range is not particularly limited, it is preferable to extract power in a frequency range that can derive significant results in consideration of human respiration. In the case of the present embodiment, the frequency range ΔF is 0.7/60 Hz or more and 1.5/60 Hz or less, and the maximum power in this range is extracted as the power.

The time calculation unit 140 is a processing unit that calculates an excess period, which is the total time during which the power calculated by the power extraction unit 130 exceeds the first threshold in a predetermined second period longer than the first period. The second period is not particularly limited, but is preferably set to a period in which significant results can be derived in consideration of the change time of human symptoms. For example, the second period is preferably about 3600 seconds. In the case of the present embodiment, the first period and the second period end at the same time, and the first period is included in the second period. Also, the times at which the first period and the second period end are the times when the oxygen saturation is acquired from the pulse oximeter 200 . Thereby, the accumulated nocturnal hypoxemia can be determined in real time.

The first threshold is not particularly limited, but is preferably set to a value that allows significant determination of the type of intermittent nocturnal hypoxemia. In this embodiment, the first threshold is set to Pth (2.0).

The determination unit 150 is a processing unit that determines that the type is the intermittent type when the time calculated by the time calculation unit 140 is equal to or greater than the second threshold.

The second threshold is not particularly limited, but is preferably set to a value that allows significant determination of the type of intermittent nocturnal hypoxemia. In this embodiment, the second threshold is set to 1300 seconds.

Therefore, in the case of the present embodiment, the determination unit 150 determines that it is the intermittent type when the time calculated by the time calculation unit 140 exceeds 1300 seconds.

The notification unit 160 is a processing unit that notifies the result of the determination unit. The notification method of the determination result by the notification unit 160 is not particularly limited, and the occurrence of the intermittent type may be notified to the person by sound, light, image, vibration, or the like. Alternatively, the information may be notified by transmitting it to another computer, terminal, or the like. Furthermore, it may be transmitted as a message such as an e-mail.

In the case of the present embodiment, the notification unit 160 is communicably connected to the display device 210 such as a liquid crystal display, and based on the determination result of the determination unit 150, intermittently displays characters, symbols, images, etc. that can be recognized by humans. is notified by displaying on the display device 210 that the type of

The baseline calculation unit 170 is a processing unit that calculates a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit 110 .

The baseline is the oxygen saturation level when the waveform of the oxygen saturation information has remained substantially constant without any significant change for a predetermined period of time before the waveform drops below the third threshold with respect to the baseline. It is a moving average of values.

The detection unit 180 is a processing unit that detects that the oxygen saturation has become equal to or less than the third threshold and that the oxygen saturation has become equal to or less than the fourth threshold with respect to the calculated baseline.

The third threshold is not particularly limited, but is preferably set to a value that allows significant determination of the type of persistent nocturnal hypoxemia. In the case of this embodiment, the third threshold is set to -3% from the baseline value at the detection time. Therefore, since the baseline fluctuates slowly, the third threshold fluctuates as well.

For example, when the baseline value at the detection time is 97%, the third threshold is 94.1%, and the detection unit 180 detects that the oxygen saturation has become 94.1% or less.

Although the third threshold and the fourth threshold do not necessarily have the same value, in the case of this embodiment, the third threshold and the fourth threshold have the same value.

The period measurement unit 190 is a processing unit that measures the duration, which is the period detected by the detection unit 180 . Specifically, if the baseline did not vary significantly at 97%, the third threshold remains constant at 94%. In this case, the detection unit 180 detects that the oxygen saturation has become 94% or less, and the period measurement unit 190 measures the time during which the detection unit 180 continues detection as the duration.

If the duration acquired from the duration measuring unit 190 is equal to or greater than the fifth threshold, the determining unit 150 determines that the type is the persistent type, and the reporting unit 160 reports to that effect. In addition, the determination unit 150 determines that the pattern is an irregular type when the duration of the sixth threshold or more and less than the seventh threshold occurs the number of times equal to or more than the ninth threshold with an interval equal to or more than the eighth threshold. The notification unit 160 makes a determination and notifies that effect.

The fifth threshold is not particularly limited, but is preferably set to a value that allows significant determination of the type of persistent nocturnal hypoxemia. In this embodiment, the fifth threshold is set as 655 seconds.

For example, when the duration measuring unit 190 measures a duration of 655 seconds (fifth threshold) or longer, the determination unit 150 notifies that there is a persistent type.

The sixth threshold and the seventh threshold are not particularly limited, but the sixth threshold is less than the seventh threshold and is set to a value that can significantly determine the type of irregular type in nocturnal hypoxemia. is preferred. Moreover, the seventh threshold is preferably equal to or less than the fifth threshold, and in the case of this embodiment, the fifth threshold and the seventh threshold are the same. Specifically, the sixth threshold is 30 seconds and the seventh threshold is 655 seconds.

The eighth threshold is not particularly limited, but is preferably set to a value that allows significant determination of the type of irregular nocturnal hypoxemia. Moreover, it is preferable that the eighth threshold is equal to or higher than the sixth threshold. As a specific example, the eighth threshold is 90 seconds.

The ninth threshold is not particularly limited, but is preferably set to a value that allows significant determination of the type of irregular nocturnal hypoxemia. The ninth threshold is an integer of 2 or more. In the case of this embodiment, the ninth threshold is set to twice.

In the case of the present embodiment, the determination unit 150 determines that the duration measurement unit 190 measures a duration of 30 seconds (sixth threshold) or more and less than 655 seconds (seventh threshold), and measures a duration of 90 seconds (eighth threshold) or more. When the period measurement unit 190 measures the duration of 30 seconds (sixth threshold value) or more and less than 655 seconds (seventh threshold value) again after an interval of , the determination unit 150 determines that the type is an irregular type. , the notification unit 160 notifies that effect.

Next, the operation of the type discrimination device 100 will be described. FIG. 2 is a flow chart showing the operation of the type discriminating device. The oxygen saturation information acquisition unit 110 of the type discrimination device 100 acquires oxygen saturation data that changes over time (see, for example, the stage of (a) in FIG. 3) (S101). As for the data acquisition method, the already logged oxygen saturation data may be acquired collectively. 110 and the oxygen saturation information acquired by the oxygen saturation information acquisition unit 110 are linked to the time information and registered in the storage device 220 .

Next, the transformation unit 120 executes a fast Fourier transform on the data from the past to the present in the first period to perform frequency transformation (S102). In the case of this embodiment, a fast Fourier transform is performed on the data in the first period 301 (see graph (a) in FIG. 3), specifically, for example, the data within the window from the current time 300 to 600 seconds. As a result of frequency conversion, a graph as shown in graph (b) of FIG. 3 is obtained. Next, based on the result of the Fourier transform, the power extracting unit 130 extracts the maximum power in a predetermined frequency range (the horizontal dashed line range commonly shown in graphs (b) and (c) of FIG. 3) ( S103). The Fourier transform and the extraction of the maximum power are performed by the moving calculation of the first period 301 . Graph (c) of FIG. 3 shows the power for each frequency at the current point 300 . Graph (d) in FIG. 3 is a graph in which the maximum powers are arranged in time series.

As shown in the graph (d) of FIG. 3, the time calculation unit 140 sequentially acquires the calculated maximum power, After the power is acquired, the time is measured until the maximum power below the first threshold is acquired, and the time measured within the second period 302 (in the case of the present embodiment, the second period 302 is 3600 seconds) is calculated as the excess period (S104). Graph (e) in FIG. 3 is a graph in which the overtime is arranged in chronological order.

The determining unit 150 compares the calculated excess period with the second threshold 312 (in the case of the present embodiment, the second threshold 312 is 1300 seconds) (S105). When the excess period exceeds the second threshold value 302, the determination unit 150 determines that there is an intermittent type (S105: Yes). On the other hand, the determination unit 150 determines that the oxygen saturation level information acquisition unit 110 has acquired the data until the acquisition of the data is completed, that is, until the processing of all the data in one sleep of the subject is completed. If the excess period does not exceed the second threshold in between, then flag as "normal".

On the other hand, the baseline calculation unit 170 calculates the baseline 303 (see graph (f) in FIG. 4) based on the data (graph (a) in FIG. 3) acquired by the oxygen saturation information acquisition unit 110 (S106). . The baseline 303 is calculated based on a moving average over a predetermined period (for example, 3600 seconds) in principle, but if the predetermined period has not elapsed since the start of data acquisition, the baseline 303 is calculated based on the acquired data.

The detection unit 180 detects a case where the data acquired by the oxygen saturation level information acquisition unit 110 is less than or equal to the third threshold 313 (same for the fourth threshold) with respect to the calculated baseline 303 (S107). In this embodiment, the third threshold 313 is -3% of the baseline.

The period measurement unit 190 detects that the data acquired by the oxygen saturation information acquisition unit 110 is less than or equal to the third threshold 313 with respect to the baseline. A duration is measured (S108). In the graph (f) of FIG. 4, the duration is indicated by a hatched band.

The determination unit 150 determines whether or not the measured result, that is, the width of the hatched band in the graph (f) of FIG. S109), if not exceeded, a "normal" flag is set. Further, when the fifth threshold (655 seconds in the case of the present embodiment) is exceeded (the darkest hatched band in the graph (f) of FIG. 4) (S110: Yes), the determination unit 150 is a continuous type I judge. On the other hand, if the fifth threshold is not exceeded (S110, No), the determination unit 150 determines the time until the next duration of the sixth threshold or more and less than the seventh threshold (same as the fifth threshold) is measured ( For example, the period 304 shown in FIG. 4) is measured, and the time is equal to or greater than the eighth threshold (90 seconds in the present embodiment) and the tenth threshold (3600 seconds in the present embodiment). If the duration of the sixth threshold value or more and less than the seventh threshold value is measured a ninth threshold value (in the case of the present embodiment, two times), it is determined to be an irregular type. Although the tenth threshold is not particularly limited, it can be, for example, the same period as the period for calculating the baseline.

When determining unit 150 determines any one of the intermittent type, the irregular type, and the continuous type, reporting unit 160 may report to that effect through display device 210 or the like. In this case, it is possible for doctors and nurses who recognize the reported information to take appropriate measures based on the determined type.

The above processing is performed until the subject wakes up (S112: Yes). Alternatively, it is performed based on the data from when the subject falls asleep until he wakes up.

Next, the notification unit 160 sums up the contents determined based on the data from the subject falling asleep to waking up, and sums up the results of normal, intermittent, persistent, irregular, mixed type 1 (persistent + irregular). Regular type + intermittent type), mixed type 2 (persistent type + irregular type), mixed type 3 (persistent type + intermittent type), and mixed type 4 (irregular type + intermittent type) Information on whether or not to

By using the nocturnal hypoxemia type discrimination device 100 described above, it is possible to provide highly accurate information with high reproducibility that contributes to the doctor's treatment policy decision. can play a role. In particular, it is possible to accurately provide information on complex symptoms that even specialists may overlook. It should be noted that the determination result obtained by analyzing the oxygen saturation data obtained from 48 subjects during sleep by 10 doctors, and the first threshold value shown in the present embodiment Based on the specific numerical values of the to tenth threshold values, the matching rate of the results determined by the type determination device 100 was 66.7%. The data only specifically shows the usefulness of the result determined by the type determination device 100 based on an example of the threshold, and does not indicate the intention to limit each threshold of the present invention to the above specific numerical values. .

In addition, by using the type discriminating device 100, a general therapist or an assistant who assists the therapist can implement a treatment method suitable for the condition of the therapist.

Furthermore, based on the information reported by the reporting unit 160, the therapeutic device can appropriately change the therapeutic conditions such as oxygen concentration, oxygen flow rate, and air pressure. Specifically, for example, when it is determined to be the intermittent type, nasal continuous positive airway pressure (CPAP) can be selected as a therapeutic method. If it is determined to be of the irregular type, both adjustment of at least one of the oxygen amount corresponding to the oxygen saturation and the oxygen concentration can be selected. In addition, when it is determined to be a continuous type, it is possible to select a treatment in which a constant oxygen flow rate is applied. It is also possible to combine these therapies when reported as a combined type.

It should be noted that the present invention is not limited to the above embodiments. For example, another embodiment realized by arbitrarily combining the constituent elements described in this specification or omitting some of the constituent elements may be an embodiment of the present invention. The present invention also includes modifications obtained by making various modifications to the above-described embodiment within the scope of the gist of the present invention, that is, the meaning of the words described in the claims, which a person skilled in the art can think of. be

For example, in the above embodiment, the case of determining the type of nocturnal hypoxemia was explained using percutaneous arterial oxygen saturation measurement data obtained by a pulse oximeter. The type of nocturnal hypoxemia may be determined using the measured data on saturation.

In addition, the case where the information determined by the determination unit is notified in real time has been described, but the result of determination based on the data accumulated during one or more sleeps of the subject is not reported in real time. I don't mind if you let me know.

Also, the type discriminating device, the pulse oximeter, the display device, and the storage device have been described as separate units, but some of them may be combined into one unit.

Moreover, the type discrimination device may be realized by executing software using a general-purpose device such as a smartphone, a tablet terminal, or a computer.

It can be used to discriminate types of nocturnal hypoxemia. Specifically, it is used in screening tests for patients with chronic obstructive pulmonary disease, pulmonary tuberculosis sequelae, pulmonary fibrosis, collagen interstitial pneumonia, heart disease, thoracic and spinal column disease, and neuromuscular disease. It is possible.

100 type discriminating device 110 oxygen saturation information acquisition unit 120 conversion unit 130 power extraction unit 140 time calculation unit 150 determination unit 160 notification unit 170 baseline calculation unit 180 detection unit 190 period measurement unit 200 pulse oximeter 210 display device 220 storage device

Claims (7)

an oxygen saturation information acquisition unit that acquires oxygen saturation information, which is information about temporal changes in arterial blood oxygen saturation during sleep of the subject;
a conversion unit that frequency-converts oxygen saturation information within a predetermined first period;
a power extraction unit that extracts power within a predetermined frequency range based on the data converted by the conversion unit;
measuring the time when the power extracted by the power extracting unit exceeds the first threshold value by calculating the movement of the first period; longer than the first periodincluding the first periodin the prescribed second periodof the measured timea time calculation unit that calculates the total excess period;
a determination unit that determines that the type is an intermittent type when the excess period calculated by the time calculation unit is equal to or greater than the second threshold;
a notification unit that notifies the result of the determination unit;
A typology discriminator comprising a A baseline calculation unit that calculates a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit;
A detection unit that detects that the oxygen saturation has become equal to or lower than a third threshold with respect to the calculated baseline;
a period measuring unit that measures a duration that is the period detected by the detecting unit;
The determination unit
2. The type discriminating device according to claim 1, wherein when the duration is equal to or greater than a fifth threshold, the type is determined to be a persistent type. A baseline calculation unit that calculates a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit;
A detection unit that detects that the oxygen saturation has become equal to or lower than a fourth threshold with respect to the calculated baseline;
a period measuring unit that measures a duration that is the period detected by the detecting unit;
The determination unit
2. If the duration of the sixth threshold or more and less than the seventh threshold occurs a number of times equal to or more than a ninth threshold with a time interval equal to or more than an eighth threshold, the pattern is determined to be an irregular type. A typing device as described. A baseline calculation unit that calculates a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit;
A detection unit that detects that the oxygen saturation has become equal to or lower than a third threshold with respect to the calculated baseline;
a period measuring unit that measures a duration that is the period detected by the detecting unit;
The determination unit
If the duration is greater than or equal to the fifth threshold, it is determined to be a persistent type,
2. If the duration of the sixth threshold or more and less than the seventh threshold occurs a number of times equal to or more than a ninth threshold with a time interval equal to or more than an eighth threshold, the pattern is determined to be an irregular type. A typing device as described. A baseline calculation unit that calculates a baseline of oxygen saturation from the oxygen saturation information acquired by the oxygen saturation information acquisition unit;
A detection unit that detects that the oxygen saturation has become equal to or lower than a third threshold with respect to the calculated baseline;
a period measuring unit that measures a duration that is the period detected by the detecting unit;
If the determination unit determines that the type is not the intermittent type and the duration is equal to or greater than a fifth threshold, the determination unit determines that the type is the persistent type,
2. If the duration of the sixth threshold or more and less than the seventh threshold occurs a number of times equal to or more than a ninth threshold with a time interval equal to or more than an eighth threshold, the pattern is determined to be an irregular type. A typing device as described. The type discrimination device according to any one of claims 1 to 5, wherein the oxygen saturation information acquisition unit acquires oxygen saturation information from a pulse oximeter attached to the subject. The determination unit determines the type based on oxygen saturation information from before a predetermined period to the present,
The type discrimination device according to any one of claims 1 to 6, wherein the notification unit immediately reports the result of the determination unit.

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