Assessment of Preload Dependence and Fluid Responsiveness
First Claim
1. A method of determining a cardiovascular parameter reflecting preload dependence, fluid responsiveness or, volume responsiveness comprising:
- receiving a waveform dataset corresponding to an arterial blood pressure, or a signal proportional to, or derived from, the arterial blood pressure signal;
detecting an irregular cardiac cycle;
compensating for the effect of the irregular cardiac cycle to form a modified waveform dataset; and
calculating a cardiovascular parameter reflecting preload dependence, fluid responsiveness, or volume responsiveness using the modified waveform dataset.
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Abstract
Methods for determining a cardiovascular parameter reflecting fluid or volume changes and for detecting arrhythmia are disclosed. These methods involve receiving a waveform dataset corresponding to an arterial blood pressure, pulseox, Doppler ultrasound or bioimpedance signal and analyzing the waveform to detect irregular cardiac cycles. Irregular cardiac cycles are detected, for example, by comparing parameters of individual cardiac cycles to the parameters of other or average cardiac cycles. If any irregular cardiac cycles are present, their effect is compensated for to form a modified waveform dataset. Once any irregular cardiac cycles are compensated for, a cardiovascular parameter reflecting fluid or volume changes using the modified waveform dataset is calculated. In the method for determining arrhythmia, if the number of irregular cardiac cycles exceeds a predetermined arrhythmia threshold, a user such as a medical professional is notified.
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Citations
79 Claims
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1. A method of determining a cardiovascular parameter reflecting preload dependence, fluid responsiveness or, volume responsiveness comprising:
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receiving a waveform dataset corresponding to an arterial blood pressure, or a signal proportional to, or derived from, the arterial blood pressure signal; detecting an irregular cardiac cycle; compensating for the effect of the irregular cardiac cycle to form a modified waveform dataset; and calculating a cardiovascular parameter reflecting preload dependence, fluid responsiveness, or volume responsiveness using the modified waveform dataset. - View Dependent Claims (2, 9, 10, 12, 13, 15, 29, 32, 33)
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37. A method of detecting arrhythmia comprising:
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receiving a waveform dataset corresponding to an arterial blood pressure, or a signal proportional to, or derived from the arterial blood pressure signal; detecting irregular cardiac cycles; and notifying a user if the number of irregular cardiac cycles exceeds a predetermined arrhythmia threshold. - View Dependent Claims (38, 42, 44, 51, 52, 59, 62, 64, 78)
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Specification