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Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats

Invasive Hemodynamic Characterization of the Portal-hypertensive Syndrome in Cirrhotic Rats

Published on: August 1, 2018

Evaluation of portal vascular resistance using an intraoperative Doppler ultrasound

Toshikazu Ito¹, Yasuo Matsuda, Yoshiro Oguchi

¹Department of Surgery, Otemae Hospital, 1-5-34 Otemae, Chuo-ku, Osaka 540-0008, Japan.

Hepato-Gastroenterology

|May 9, 2002

Abstract

Background/Aims:

To evaluate portal vascular resistance using Doppler ultrasound intraoperatively.

Methodology:

We measured maximum flow velocities and pressures of umbilical portion of the left portal branch before and after clamping of the right main branch of the Glisson's sheath. We proposed a new index, simplified portal resistive index, that was the ratio of the difference of the portal venous pressure to the difference of maximum portal flow velocity.

Results:

There were good correlations between portal vascular resistance and simplified portal resistive index. Simplified portal resistive index was found to become higher as fibrotic changes progressed, and there were significant differences between normal liver, chronic hepatitis, and liver cirrhosis.

Conclusions:

Simplified portal resistive index evaluated using intraoperative Doppler ultrasound is an easy and reliable index for assessing portal vascular resistance during liver surgery.

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Portal Hypertension

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Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...

Assessing Blood pressure using a doppler ultrasound

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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