What Is the Function of the Vena Cava?

Venous auscultation is an auxiliary examination method to check whether the blood vessels are normal. The characteristic of venous murmur is that the murmur is obvious on the right neck. The murmur is enhanced when inhaling, turning the head to the left, and inhaling isoamyl nitrite. It is the loudest when sitting or standing. The murmur is in the supine position and when the vein is compressed That disappears. Through this examination, you can determine the lesion site and the corresponding symptoms.

Name: Intravenous auscultation

category: Special inspection

Normal auscultation of vein

In normal children or young people, sometimes on the right jugular vein (the venous murmur of the camp can be heard in the superior clavicle fossa. It is clearer when standing or when the head is turned to the left. This may be the upper cavity of the jugular vein with a wide inlet diameter. The veins are physiological, and the murmur disappears after pressing the jugular vein with your fingers. This vein murmur can be clearer when the blood flow is accelerated by anemia and other reasons.

Clinical significance of intravenous auscultation

Abnormal results: (1) The jugular humming is physiological and can be seen in healthy adolescents and patients with anemia. This murmur caused by eddy current when blood flows through the spherical expansion of the confluence of the vein and superior vena cava can sometimes be transmitted to the aortic valve area above the anterior thorax, the pulmonary valve area and its vicinity, and can be misdiagnosed as having an open duct, Thyroid murmurs, or other heart murmurs, should be identified. This sound is different from the vascular murmur of the thyroid, which increases with the systole of the heartbeat and does not disappear when the jugular vein is compressed. (2) Hepatic vein murmur, which is caused by the rapid flow of blood from the left branch of the portal vein into a dilated peri-umbilical vein or a tortuous vein. Seen in: Ke-Bao syndrome: The main feature of this syndrome is the obvious dilation of the abdominal wall and umbilical cord. The twisted veins bulge on the skin, especially when standing, like a sea snake head. Any cause of portal cirrhosis, such as schistosomiasis, malaria, chronic alcoholism, melanosis, syphilis, etc. can form the K-Bao syndrome, which is a strong evidence of portal hypertension. Cavernous hemangiomas of the liver. The disease can also be heard in the veins of "yingying". Pressurized during the examination, the noise can be significantly weakened or disappeared. This noise can sometimes be heard after the sub-mesenal vein or portal-caval vein anastomosis. (3) Abdominal wall venous hum, seen during liver cirrhosis. People to be checked: routine physical examination items, those with abnormal blood vessels.

Notes on intravenous auscultation

Unsuitable population: severe vascular and cardiac insufficiency. Contraindications before the test: Maintain a normal diet and schedule. Requirements during the examination: The location of the examination is usually around the umbilicus or the upper abdomen. Patients actively cooperate with the doctor during the examination. It is not suitable for strenuous exercise one hour before the examination, and it should not be too tense during the examination to avoid affecting the results.

Vein auscultation process

The contents and methods of the examination are as follows: (1) The jugular vein hum (venous hum) is a soft, continuous noise that is heard on the sides of the neck, above or below the collarbone, or just inside the supraclavicular fossa. Like "Yingying", the tone is low or medium, and it is loudest in middle diastole. (2) Liver venous murmur refers to a continuous, low-pitched "yingying" sound that resembles a bee's wing and is heard at the xiphoid process and around the umbilicus. The characteristics of the murmur, which is more pronounced in the supine or upright position than in the sitting position, can be enhanced when inhaling deeply, and can be enhanced after the spleen is compressed. When the hand is gently pressed at the loudest part of the murmur, a slight tremor can be felt. (3) Abdominal wall venous hum (abdominal wall venous hum) around the umbilicus or upper abdomen can be heard a continuous venous buzzing, due to portal hypertension, abdominal wall collateral circulation veins dilate, resulting in increased blood flow.

Venous auscultation- related diseases

Chest wall phlebitis, abdominal wall thrombophlebitis, abdominal aortic vena cava fistula, congenital venous malformation of limb hypertrophy syndrome, insufficiency of venous valve closure of lower limbs, etc.