The size of the common bile duct is a predictor of biliary obstruction and it’s measurement is therefore an important component in the evaluation of the biliary system. Availability of normal measurements of the common bile duct would help to distinguish obstructive from non-obstructive causes of jaundice.
All the physical measurements were conducted in a separate area, screened off to provide privacy. The following procedures were adopted for conducting anthropometric measurements : Subjects were asked to stand with their feet together with weight evenly distributed over both feet and with their arms relaxed at the sides during the measurements.
Aim: Study was conducted to obtain data on sonographically measured diameters of common bile duct in a series of normal Rajasthani population and to measure its correlation with age, sex and anthropometry.
Materials and Methods
We conducted a cross-sectional hospital-based study at Mahatma Gandhi Medical College and Hospital, Jaipur. A total of 200 subjects, comprising an equal proportion of males and females were included in the study. The study included normal healthy adult male and non-pregnant female subjects visiting hospital OPD for regular check-up without any history of or known hepatobiliary disease, cardiac disorders, splenomegaly and portal hypertension. An informed consent was obtained from all the subjects prior to enrolment in the study.
- The gallbladder is an elongated pear-shared organ that lies on the inferior surface of the liver. The liver occupies a prominent region of the right upper abdomen.
- The body of the gallbladder gradually tapers to the neck which empties into the cystic duct.
- After a short distance, the cystic duct joins the common hepatic duct to become the common bile duct (CBD). The CBD typically courses with the hepatic artery and the portal vein.
- Image 1: Hepatobiliary Anatomy: Notice the CBD runs parallel to the portal vein and the hepatic artery in a sagittal orientation.
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- Scanning technique: In general, the curvilinear probe should be used to perform this exam. Lower frequency can be used for obese patients to help with sound penetration.
- The phased array probe may be useful if the gallbladder can only be imaged using an intercostal window.
- Subcostal Sweep Approach – Place the probe in sagittal (longitudinal) orientation with the probe-indicator oriented toward the patient’s head and instruct the patient to take a deep breath. Sweep the probe inferiorly and laterally along the right subcostal margin. (Video 1)
I. Introduction and Indications