Lipophilic toxins (via lipid phase partitioning)

Lipophilic toxins via lipid phase partitioning refers to a pharmacokinetic mechanism where hydrophobic molecules distribute into lipid environments, a principle central to the lipid sink theory used in emergency toxicology (Fettiplace & Weinberg, 2018, PMID: 29433444). This process is not a single molecular target but a physical-chemical interaction where intravenous lipid emulsions (ILE) are used to sequester lipophilic drugs from the plasma (Gosselin et al., 2016, PMID: 27593015). By increasing the lipid content of the blood, ILE creates a partition phase that draws toxins away from sensitive tissues like the myocardium and brain, effectively reducing systemic toxicity (StatPearls, 2023, NBK549768). This approach is primarily indicated for local anesthetic systemic toxicity (LAST) and certain lipophilic drug overdoses, such as those involving beta-blockers or calcium channel blockers (Cave & Harvey, 2009, PMID: 19713770). The efficacy of this mechanism depends on the logP (lipophilicity) of the toxin, with more lipophilic substances being more readily sequestered. Despite its clinical utility, it is classified as a pharmacokinetic intervention rather than a traditional therapeutic receptor or enzyme target.

Other names

Lipid sinkLipid rescueLipid phase sequestrationLipophilic drug partitioning

The lipid sink effect involves the creation of a lipid phase in the blood that sequesters lipophilic toxins, thereby reducing their free concentration in the plasma and facilitating their redistribution away from target organs like the heart and brain.