NIBP trigger in response to detected heart rate variability
First Claim
1. An automated sphygmomanometer apparatus, comprising:
- a blood pressure measurement apparatus which measures a patient'"'"'s blood pressure using a noninvasive blood pressure cuff;
a heart rate variability monitor which monitors variations in the patient'"'"'s heart rate without inflating said blood pressure cuff; and
control means for initiating a blood pressure measurement by said blood pressure measurement apparatus when said heart rate variability monitor indicates that the patient'"'"'s heart rate has varied a predetermined amount over a predetermined period of time, said predetermined amount of heart rate variability correlating to a predetermined percentage chance in the patient'"'"'s blood pressure.
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Accused Products
Abstract
An automated sphygmomanometer which triggers a blood pressure determination upon detection of a significant change in the patient'"'"'s heart rate variability (HRV). The HRV can be measured directly from the NIBP signal or, when a multiparameter monitor is used, the HRV can be measured from the ECG signal or the NIBP signal. HRV is continuously monitored and the baseline HRV is correlated with baseline blood pressure values. Changes in HRV are displayed continuously on a display so that the clinician can determine whether to initiate an NIBP measurement or, on the other hand, the NIBP measurement can be triggered automatically in response to a change in HRV without any intervention by the clinician. Alternatively, the patient monitor can "learn" the correlation between HRV and blood pressure changes and only alert the clinician when a significant change in HRV has taken place. The technique of the invention allows the clinician to monitor NIBP at less frequent intervals without the concern of missing physiologically significant changes in blood pressure and without the requirement of "check inflates" in a guard mode.
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Citations
15 Claims
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1. An automated sphygmomanometer apparatus, comprising:
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a blood pressure measurement apparatus which measures a patient'"'"'s blood pressure using a noninvasive blood pressure cuff; a heart rate variability monitor which monitors variations in the patient'"'"'s heart rate without inflating said blood pressure cuff; and control means for initiating a blood pressure measurement by said blood pressure measurement apparatus when said heart rate variability monitor indicates that the patient'"'"'s heart rate has varied a predetermined amount over a predetermined period of time, said predetermined amount of heart rate variability correlating to a predetermined percentage chance in the patient'"'"'s blood pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An automatic oscillometric blood pressure monitor comprising:
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a pressurized cuff; means for inflating and deflating said cuff; means for measuring arterial pressure oscillation complexes through measurement of time varying pressures within said cuff; means for determining the patient'"'"'s blood pressure at predetermined intervals by instructing said inflating and deflating means to inflate said cuff about an artery of a patient until said cuff is at a pressure level above the patient'"'"'s estimated systolic pressure and to deflate said cuff by predetermined pressure decrements, by searching for arterial pressure oscillation complexes at each pressure level, and by determining, from said arterial pressure oscillation complexes, parameters representative of at least a portion of an oscillometric envelope of the patient; means for detecting variations in the patient'"'"'s heart rate without inflating said cuff; and means responsive to said heart rate variations detecting means for immediately initiating a blood pressure determination by said blood pressure determining means prior to the expiration of any of said predetermined intervals if said detecting means detects variations in the patient'"'"'s heart rate which correlate to a predetermined percentage change in the patient'"'"'s blood pressure. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method of monitoring a patient'"'"'s blood pressure, comprising the steps of:
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determining, at predetermined intervals, the patient'"'"'s blood pressure using a noninvasive blood pressure cuff; continuously determining the patient'"'"'s heart rate and continuously monitoring variations in said heart rate without inflating said cuff; correlating variations in the patient'"'"'s heart rate with changes in the patient'"'"'s blood pressure; and initiating a blood pressure determination prior to the expiration of any of said predetermined intervals if variations in the patient'"'"'s heart rate are determined in said correlating step to correlate to a predetermined percentage change in the patient'"'"'s blood pressure.
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15. In an automatic oscillometric blood pressure monitor comprising a pressurized cuff, means for inflating and deflating said cuff, means for measuring arterial pressure oscillation complexes through measurement of time varying pressures within said cuff, and means for determining a patient'"'"'s blood pressure at predetermined intervals by instructing said inflating and deflating means to inflate said cuff about an artery of the patient until said cuff is at a pressure level above the patient'"'"'s estimated systolic pressure and to deflate said cuff by predetermined pressure decrements, by searching for arterial pressure oscillation complexes at each pressure level, and by determining, from said arterial pressure oscillation complexes an oscillometric envelope of the patient, a method of monitoring a patient'"'"'s blood pressure comprising the steps of:
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determining the patient'"'"'s heart rate without inflating said cuff; monitoring variations in said heart rate; correlating variations in said heart rate with variations in the patient'"'"'s blood pressure; and initiating a blood pressure determination by said oscillometric blood pressure monitor prior to the expiration of any of said predetermined intervals if variations in the patient'"'"'s heart rate correlate to a predetermined percentage change in the patient'"'"'s blood pressure.
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Specification