Learn about the ligation test

Dengue hemorrhagic fever is a very common infectious disease in tropical countries like Vietnam and is diagnosed based on NS1 Ag antigen test. Despite its high accuracy, the long waiting time for the results can delay the management of complications. The ligation test was born for the purpose of early diagnosis of dengue fever to proactively treat effectively. .

1. What is the ligature test?

The ligation test is a test used to test and evaluate the strength of the patient's vascular walls, mainly capillaries. The principle of implementation is to actively obstruct the circulation to the heart to increase the pressure in the veins and capillaries, then suddenly reduce the pressure if the vessel wall is less stable, the red blood cells will be pushed out of the vessel wall, causing damage to the blood vessels. subcutaneous hemorrhage in the form of small petechiae.

Xét nghiệm sốt xuất huyết bao nhiêu tiền — Nghiệm pháp dây thắt là nghiệm pháp dùng để kiểm tra và đánh giá sức bền thành mạch

2. How is the ligation test done?

The ligation test may be indicated in all cases of suspected capillary failure and is not contraindicated. The examiner will perform the ligation test according to the following steps:
First, it is necessary to check the hemorrhagic nodules on the patient's hand, if any, to distinguish it from the newly appeared hemorrhagic nodules to avoid errors in the process of reading the results. Measure the patient's blood pressure with a conventional sphygmomanometer Continue to maintain the blood pressure at the average value between the maximum and minimum blood pressure for about 10 minutes Quickly remove the sphygmomanometer and raise the patient's hand to blood circulation is normal, wait about 2 minutes and read the result as the number of petechiae on a certain area of skin.

3. How to evaluate the results of the ligation test?

The results of the ligation test will be based on the number of petechiae per 1cm2 of skin on the anterior forearm and forearm below the ligature. The corresponding results are as follows:
5-9 nodules/cm2: suspect (+) 10-19 nodules/cm2: positive (++) More than 19 nodules/cm2: positive (+++) Characteristics to receive The hemorrhagic nodule is a few millimeters in diameter, may be larger but no more than 1cm, is red, is flat with the skin, does not disappear when pressed on a slide or is stretched and disappears in 2-5 days.
The ligation test can be used for early diagnosis of dengue but is not specific and can be positive in cases of meningococcal bacteremia, allergic capillary inflammation, coagulation factor deficiency, primary thrombocytopenia or disseminated intravascular coagulation,...

Sốt xuất huyết kéo dài bao lâu — Nghiệm pháp dây thắt có thẻ dùng để chẩn đoán sớm sốt xuất huyết

4. Significance of the ligation test in the diagnosis of dengue fever

If the ligation test is positive and the patient has 2 signs of thrombocytopenia and hemoconcentration at the same time, then Dengue fever can be diagnosed with the following grades:
Grade I: The patient has fever and no symptoms. spontaneous bleeding, but platelets decreased and hematocrit increased Grade II: The patient had fever and spontaneous bleeding under the skin, mucous membranes or visceral organs combined with decreased platelets and increased hematocrit Grade III: decreased platelets, increased hematocrit, blood Unstable action: low pulse, low blood pressure, cold hands and feet, and the patient may be lethargic Grade IV: Platelet, hematocrit increased, peripheral pulse loss, blood pressure to 0 mmHg If abnormal problems are noticed Customers should visit and consult with specialists.

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Bài viết này được viết cho người đọc tại Sài Gòn, Hà Nội, Hồ Chí Minh, Phú Quốc, Nha Trang, Hạ Long, Hải Phòng, Đà Nẵng.