Method and apparatus for determining extreme blood pressure values
First Claim
1. A method for obtaining at least one blood pressure value of interest from a non-invasive blood pressure measurement using an oscillometric technique, the blood pressure measurement altering the pressure of an occluder over a measurement time period to vary the extent of occlusion of a blood vessel used for pressure measurement, said method comprising the steps of:
- (a) analyzing the functioning of the heart to obtain physiological data suitable for identifying, in a series of heartbeats in the measurement time period, those heartbeats having blood pressure properties of interest from heartbeats not having blood pressure properties of interest;
(b) obtaining oscillometric blood pressure measurement data for the heartbeats of the series and associating same to the physiological data;
(c) establishing at least one criterion for the physiological data that identifies heartbeats in the series of heartbeats having the blood pressure properties of interest;
(d) applying the criterion to the physiological data to accumulate oscillometric blood pressure measurement data for which the associated physiological data meets the criterion; and
(e) deriving at least one blood pressure value of interest from the accumulated oscillometric blood pressure measurement data.
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Abstract
In a method and apparatus for measuring extreme blood pressure values during a single non-invasive blood measurement, the time intervals between sequential heartbeats are measured for a series of heartbeats in an oscillometric blood pressure measurement time period. Oscillometric blood pressure measurement data for the heartbeats of the series is obtained and associated with the heartbeat time intervals. An average time interval between heartbeats is also determined. A first data bin may be defined for blood pressure data associated with time intervals that are longer as compared to the average time interval. A second data bin is defined for blood pressure data with time intervals that are shorter as compared to the average time interval. The measured oscillometric blood pressure data is sorted into the data bins in accordance with the associated time intervals. The data in the first data bin is used to derive a high systolic blood pressure value and a low diastolic blood pressure value. The data in the second bin is used to derive a low systolic blood pressure value and a high diastolic blood pressure value. A typical blood pressure value may also be determined.
22 Citations
41 Claims
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1. A method for obtaining at least one blood pressure value of interest from a non-invasive blood pressure measurement using an oscillometric technique, the blood pressure measurement altering the pressure of an occluder over a measurement time period to vary the extent of occlusion of a blood vessel used for pressure measurement, said method comprising the steps of:
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(a) analyzing the functioning of the heart to obtain physiological data suitable for identifying, in a series of heartbeats in the measurement time period, those heartbeats having blood pressure properties of interest from heartbeats not having blood pressure properties of interest;
(b) obtaining oscillometric blood pressure measurement data for the heartbeats of the series and associating same to the physiological data;
(c) establishing at least one criterion for the physiological data that identifies heartbeats in the series of heartbeats having the blood pressure properties of interest;
(d) applying the criterion to the physiological data to accumulate oscillometric blood pressure measurement data for which the associated physiological data meets the criterion; and
(e) deriving at least one blood pressure value of interest from the accumulated oscillometric blood pressure measurement data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for obtaining extreme blood pressure values from a single non-invasive blood pressure measurement using an oscillometric technique, the blood pressure measurement altering the pressure of an occluder over a measurement time period to vary the extent of occlusion of a blood vessel used for pressure measurement, said method comprising the steps of:
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(a) measuring the time intervals between sequential heartbeats for a series of heartbeats in the measurement time period;
(b) obtaining oscillometric blood pressure measurement data for the heartbeats of the series and associating same to the heartbeat time intervals;
(c) determining an average time interval between heartbeats from time interval measurements associated with the measurement time period;
(d) defining data bins for measured oscillometric blood pressure data in accordance with predetermined properties of the time intervals associated with the blood pressure data to include at least a first bin for blood pressure data associated with time intervals that are longer as compared to the average time interval and a second bin for blood pressure data with time intervals that are shorter as compared to the average time interval;
(e) sorting the measured oscillometric blood pressure data into the data bins in accordance with the associated time intervals;
(f) deriving at least one of a high systolic blood pressure value and a low diastolic blood pressure value for the blood pressure measurement from the data in a first data bin; and
(g) deriving at least one of a low systolic blood pressure value and a high diastolic blood pressure value for the blood pressure measurement from the data in a second bin. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. Apparatus for obtaining at least one blood pressure value of interest from a non-invasive blood pressure measurement using an oscillometric technique, the blood pressure measurement altering the pressure of an occluder over a measurement time period to vary the extent of occlusion of a blood vessel used for pressure measurement, said apparatus comprising:
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means for obtaining physiological data suitable for identifying, in a series of heartbeats in the measurement period, those heartbeats having blood pressure properties of interest from heartbeats not having blood pressure properties of interest;
means couplable to said occluder for obtaining oscillometric blood pressure measurement data for the heartbeats of the series;
means for associating the oscillometric to the physiological data;
means for establishing at least one criterion blood pressure measurement data for the physiological data that identifies heartbeats in the series having the blood pressure properties of interest;
means for applying the criterion to the physiological data to accumulate oscillometric blood pressure measurement data for which the associated physiological data meets the criteria; and
means for deriving at least one blood pressure value of interest from the accumulated oscillometric blood pressure measurement data. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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Specification