Справочник Пользователя для Innokas Yhtyma Oy VC150
C-2
VC150 Vital Signs Monitor
KO00065K
Principles of noninvasive blood pressure determination (NIBP): DINAMAP SuperSTAT algorithm
DINAMAP SuperSTAT algorithm
The oscillometric method of determining NIBP is accomplished by a sensitive
transducer which measures cuff pressure and pressure oscillations within the
cuff. For the first determination taken on a patient, the algorithm stores the
pattern of the patient's oscillation size as a function of the pressure steps.
transducer which measures cuff pressure and pressure oscillations within the
cuff. For the first determination taken on a patient, the algorithm stores the
pattern of the patient's oscillation size as a function of the pressure steps.
When NIBP measurements are performed: 1) the monitor will use a previous
NIBP value for adaptive target inflation pressure as long as this is displayed on
the screen. 2) the NIBP values are displayed for a maximum of 30 minutes or
until another determination is initiated. When the values on the screen expire or
the patient is discharged, the adaptive target pressure will be automatically
cleared.
NIBP value for adaptive target inflation pressure as long as this is displayed on
the screen. 2) the NIBP values are displayed for a maximum of 30 minutes or
until another determination is initiated. When the values on the screen expire or
the patient is discharged, the adaptive target pressure will be automatically
cleared.
For subsequent single, auto, or STAT determinations taken before data of the
previous determination of the same patient has expired, as few as four 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.
previous determination of the same patient has expired, as few as four 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 settles at an initial target pressure of 135 mmHg (adult
mode) and 100 mmHg (neonate mode), depending on initial target pressure
preset. To allow for rapid settling of cuff pressure, the monitor will momentarily
inflate to a higher pressure then immediately deflate to the target pressure. After
inflating the cuff, the NIBP parameter begins to deflate. The oscillations versus
cuff pressure are measured to determine the mean pressure and calculate the
systolic and diastolic pressures.
mode) and 100 mmHg (neonate mode), depending on initial target pressure
preset. To allow for rapid settling of cuff pressure, the monitor will momentarily
inflate to a higher pressure then immediately deflate to the target pressure. After
inflating the cuff, the NIBP parameter begins to deflate. The oscillations versus
cuff pressure are measured to determine the mean pressure and calculate the
systolic and diastolic pressures.
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.
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.