Verathon AORTASCAN AMI 9700, Руководство по эксплуатации и техническому обслуживанию

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Operations & Maintenance Manual: Using the Device
MEASURING AORTIC dIAMETERS < 3 CM
The AortaScan AMI 9700 can detect aortas with diameters between 3 cm and 12.4 cm. Diameters less than
3 cm occur in patients who have normal‑sized aortas.
The round shadow at 6 cm depth in the results display is the patient’s abdominal aorta. Patients with
aortas less than 3 cm in diameter will show no red outline around the aorta in the results display, as the
diameter cannot be measured automatically. However, because of the potential variability between actual
and measured diameters, the absence of a red outline around the aorta cannot be relied upon to identify an
abdominal aorta less than 3 cm in diameter. The diameter can also be estimated using Manual Measurement
Mode.
The “speckled” look to the Results display indicates the ultrasound signal was not blocked by bowel gas. The
clearly visible aorta and the lack of any arrows telling the user to re‑aim the probe mean the user can feel
confident that the lack of diameter information is due to a small aorta and not due to the presence of bowel
gas. In this case, the aortic diameter measurement is valid.
PARTIAL GAS OBSTRUCTION
In some cases, gas or air bubbles may be present but do not block the aorta entirely. In this case, diameter
measurements are still calculated, but they are not typical.
A green arrow on the console and a solid green arrow on the probe indicate the abdominal aorta can be
detected, but the presence of bowel gas prevents a proper measurement.
Figure 21. Partial Gas Obstruction
Moving the probe 1/2 to 1 inch (1 to 3 cm) in the direction of the arrow has a high probability of obtaining a
successful scan.
In this case, the probe should be repositioned and the patient rescanned. Gently but firmly work the probe
into the tissues of the abdomen with a side‑to‑side rocking motion to try and displace any bowel gas
obscuring the aorta. Do not move the probe while the scan is in progress as that will decrease the accuracy
of the measurement.