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This graph, Figure 6.7-13, is a summary of the surrogate waveform estimated P2/P1 peaks ratio for each minute of the monitoring period. Each blue line represents a minute of the monitoring session and the value of each in the graph scale, i.e., the estimated calculated ratio for that minute. Each lighter blue rectangle behind each blue line indicates the 95% confidence interval for that P2/P1 ratio estimation.
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ATTENTION - These estimated P2/P1 peaks identified in this report are the most likely P1 and P2 positions derived from a statistical model based on the cardiac cycle of patients. The estimated P2/ P1 ratio shows the value of the division between the amplitude of peak P2 and the amplitude of peak P1. Values above 1.0 indicate that P2 is greater than P1 when monitored with the brain4care sensor. |
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ATTENTION - The B4C System is an operator dependent device that contains inherent variances and as such all confidence intervals should be considered by the health professional during interpretation of estimated waveform associated parameters. |
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ATTENTION - The surrogate waveform and estimated associated parameters are intended to be utilized to monitor relative variation in an individual patient’s intracranial pressure over time. |
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PRECAUTION - The derived P2/P1 ratio is an estimated value and therefore carries some uncertainty. The clinician is reminded to use their professional judgment when interpreting this and all waveform information in the report. |
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WARNING - The B4C System does not replace a comprehensive clinical evaluation. The waveform output should always be evaluated by the clinician in conjunction with other clinical parameters or analyses |
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Figure 6.7-19 shows the overall minute of surrogate ICP waveform pulses and the moments an observation was included.
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ATTENTION - A minute can have a maximum of six observations. |
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a visual aid for the P2/P1 ratio range; a (circle); b (triangle), or; c (square)
minute count
pulse morphology with estimated P1 and P2 markings
T1 = time to pulse P1 peak
T2 = time to pulse P2 peak
Estimated P2/P1 ratio = the estimated P2/P1 ratio for that minute with confidence interval
Derived useful pulses = how many pulses from that minute were useful pulses for all associated waveform parameters calculations
heart rate = the calculated heart rate derived from ICP pulses with confidence interval
normalized Time-to-Peak (nTTP) = the normalized time to maximum peak of pulse with confidence intervals
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ATTENTION - you may see following messages will appear in place of the average pulse waveform and associated parameters
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