Related Experiment Video
Updated: Jul 10, 2026
09:54
Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes
Published on: September 12, 2018
Summary
Determining the optimal iodipamide dose for intravenous cholangiography is crucial. This study in dogs reveals a hyperbolic relationship between plasma concentration and biliary excretion, guiding safer, more effective contrast agent administration.
Area of Science:
- Radiology
- Pharmacokinetics
- Medical Imaging
Background:
- Intravenous cholangiography relies on contrast agents like iodipamide for visualizing the biliary tree.
- Optimal dosing and administration rates for iodipamide remain debated, impacting diagnostic accuracy and patient safety.
Purpose of the Study:
- To investigate the relationship between plasma concentration and iodipamide excretion in bile and urine.
- To establish optimal parameters for achieving maximum radiographic opacification of the biliary tree.
Main Methods:
- Experiments were conducted in dogs to assess iodipamide pharmacokinetics.
- Steady-state infusion and excretion were monitored to analyze plasma, biliary, and urinary concentrations.
Main Results:
- A hyperbolic relationship was identified between plasma iodipamide concentration and both biliary concentration and total biliary excretion.
- Urinary excretion of iodipamide was minimal at low plasma concentrations but increased sharply at high concentrations.
Conclusions:
- Adequate biliary visualization can be achieved with iodipamide without significant renal excretion by maintaining appropriate plasma concentrations through controlled infusion.
- A stepwise increase in infusion rate until diagnostic visualization is achieved may optimize iodipamide use, minimizing toxicity.
More Related Videos
07:28An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
Published on: July 13, 2018
08:00Colorimetric Assessment of Deiodinase 1 Activity in Human Liver Microsomes Using the Sandell-Kolthoff Reaction
Published on: April 10, 2026
Related Concept Videos
01:23Drug Elimination: Non-Renal Routes
The liver plays a pivotal role in eliminating drugs and their metabolites, primarily through a process known as biliary excretion. This process involves the hepatocytes, the primary cells in the liver that generate bile. A range of transporters actively expels polar drugs or hydrophilic drug metabolites into the bile, which transports the drugs and metabolites into the small intestine. From here, they are eventually expelled from the body through feces. In some instances, the original drug or a...
01:26Enhanced Elimination of Poison
Poison can be effectively removed from the gastrointestinal (GI) tract through various decontamination procedures.
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
Antidotes serve a crucial role in counteracting the effects of poison by inhibiting enzymes responsible for producing harmful drug metabolites. In some cases, these toxic metabolites can be neutralized by endogenous cosubstrates, which are maintained at specific concentrations to prevent interaction with cellular macromolecules and subsequent cell death.
Renal excretion is the...
01:28Renal Drug Excretion: Tubular Secretion
Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
01:17Hepatic Drug Excretion: Enterohepatic Cycling
Enterohepatic cycling involves the active secretion of drugs and their metabolites into the bile via transporters in the canalicular membrane of hepatocytes. This secretion is an integral part of the digestive process, releasing these substances into the gastrointestinal (GI) tract.
Post-release drugs and metabolites can be reabsorbed into the body from the intestine. For conjugated metabolites like glucuronides, reabsorption requires enzymatic hydrolysis by intestinal microflora. This...
Post-release drugs and metabolites can be reabsorbed into the body from the intestine. For conjugated metabolites like glucuronides, reabsorption requires enzymatic hydrolysis by intestinal microflora. This...
01:16Hepatic Drug Excretion: Influencing Factors
The biliary system of the liver, crucial for bile secretion and drug excretion, comprises intrahepatic bile ducts that merge to form the common hepatic duct. This duct, carrying hepatic bile, combines with the cystic duct, draining the gallbladder and forming the common bile duct, which empties into the duodenum. Bile, produced by hepatic cells lining the bile canaliculi, is composed primarily of water, bile salts, pigments, electrolytes, and lesser amounts of cholesterol and fatty acids. Bile...
01:10Drug Excretion: Miscellaneous Routes
Drug excretion involves various organs, including the liver, intestines, skin, and eyes. In the case of drugs or toxins, they can be actively secreted into bile by transporters in the hepatocyte's canalicular membrane. These substances enter the GI tract during digestion and may be reabsorbed into the body from the intestine. This process, known as enterohepatic recycling, can significantly prolong the presence and effects of a substance in the body. To interrupt this cycle, specific substances...