Tuesday, June 23, 2020

Ultrasound examination instructions

Ultrasound: The test is safe, non-invasive, fast, and low in price; therefore, it is widely used at present. In order to ensure the inspection effect, the inspector should pay attention to the following matters and give close cooperation.

1. Abdominal ultrasound examination should be carried out on an empty stomach in the morning, including liver, gallbladder, bile duct, pancreas, retroperitoneum, large abdominal blood vessels, etc., fasting and drinking for 8 hours before the examination, infants should be fasted 3 hours before the examination. Three days before the inspection, fasting of all fermentable foods, such as soy products, milk, pasta, etc. Check the day before the dinner and enter a small amount of liquid food (such as porridge, etc.). (The purpose is to prevent gastrointestinal bloating and gallbladder contraction from affecting observation.)

2. Ultrasound examination should be arranged before endoscopy (gastrointestinal endoscopy), barium meal and cholangiography. The isotope and X-ray barium meal examinations must be performed 3 days later, and choledochography can be performed 2 days before B-ultrasound examination. Due to gastrointestinal gas interference, it is not advisable to do an ultrasound examination of the abdomen in the afternoon even when preparing for an empty stomach.

3. Abdominal examination of bladder, prostate, seminal vesicles, ureteral stones, and uterine attachments should be performed after holding back urine. Patients should drink 500-1000 ml of water 1-2 hours before the examination.

4. Transrectal examination of the prostate and seminal vesicles should defecate and urinate; transvaginal ultrasound examination of uterine attachments should defecate (Note: menstrual period, unmarried, late pregnancy induction and puerperium, recovery period after laparoscopic hysterectomy, the lesion site is large or Keep away from the pelvic cavity, other gynecological unsuitable situations do not do transvaginal examination); unmarried people can check the uterine attachment through the rectum, should defecate.

5. In general, no special preparations are required for the examination of organs such as fetus, kidney, spleen, eye, thyroid, breast, limb blood vessels, and adult heart in the second and third trimesters of pregnancy.

6. If there are no special circumstances (coma, severe trauma, etc.), the patient should wear loose clothing for treatment. Neck ultrasound (including thyroid, neck blood vessels, etc.) do not wear necklaces and other accessories. 7. Infants and young children who do not cooperate can be examined after taking sedative drugs under the guidance of a clinician.

8. When a transesophageal ultrasound is required for suspected atrial septal defect and other heart diseases, fasting is required.

9. Large areas of skin damage (such as burns, trauma), dressing blockage, and limited body position cannot fully expose the test site. Ultrasonography should not be used when the patient cannot cooperate.

10. Those who are within 3 months of pregnancy need to hold back moderately; after 3 months of pregnancy, they generally do not need to hold back urine. When pregnant women are suspected of having placenta previa, they need to hold back urine to further understand the placenta.

11. No special preparation is required for emergency patients.

12. Due to the different conditions of the patients, some examination items may require special preparations, and ultrasound doctors will provide specific guidance when needed.

13. Ultrasound contrast examination is to dynamically observe the microcirculation perfusion of the lesion, to judge the microcirculation and microenvironment of the lesion to identify the benign and malignant tumors, the degree of plaque activity, the degree of stenosis of the canal, the judgment of postoperative efficacy, etc. The disease needs to be checked when needed.

14. Interventional biopsy and minimally invasive treatment under ultrasound guidance require preparation during the operation period and pre-operative conversation. The patient prepares past cases or other examination reports so that the examiner can make a diagnosis systematically.

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