Dinamap Pro 100V2 Specifikace stáhnout pdf (Strana 91)

Appendix C

Principles of Noninvasive Blood Pressure

Determination

The oscillometric method of determining NIBP is

accomplished by a sensitive transducer which measures cuff

pressure and minute pressure oscillations within the cuff. A

single determination (in normal mode) is initiated before

taking repeated determinations in auto or stat mode. As a

determination is taken, the algorithm stores the pattern of the

patient's oscillation size as a function of the pressure steps. In

auto and stat mode, as few as six pressure steps may be

necessary to complete the determination process. When

employing fewer pressure steps, the system uses the stored

information from the previous blood pressure determination

to decide the best pressure steps to take. The algorithm

measures the consistency of pulse size to tell if the

oscillations taken at a step are good and if more steps are

needed.

The first determination initially pumps up to a target pressure

of about 150 mmHg for adult patients depending on initial

target pressure preset. After inflating the cuff, the NIBP

parameter begins to deflate, the oscillations versus cuff

pressure is measured, and, finally, systolic pressure, mean

pressure, and diastolic pressure are calculated and the screen

is updated.

During an NIBP determination, the parameter deflates the

cuff one step each time it detects two pulsations of relatively

equal amplitude. The time between deflation steps depends

on the frequency of these matched pulses (pulse rate of the

patient). However, if the monitor is unable to find any pulse

within several seconds, it will deflate to the next step. The

process of finding two matched pulses at each step provides

artifact rejection due to patient movement and greatly

enhances the accuracy of the monitor. The figure shows a full

determination sequence for an adult patient. In stat mode,

the artifact rejection technique of two matching pulses at

each step is disabled and some steps may have only one

pulse.

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Dinamap Pro 100V2 Specifikace Strana 91