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ON THE FORMATION OF PRECIPITATES AFTER THE INTRAVENOUS INJECTION OF SALVARSAN
1Department of Physiology and Pharmacology of the Rockefeller Institute for Medical Research, New York.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Acidic salvarsan solutions form precipitates in the blood, primarily in the right heart and lungs, unlike alkaline solutions. These precipitates, though concerning for embolism, do not typically cause death or appear in arterial blood.
Area of Science:
- Pharmacology
- Toxicology
- Cardiovascular Physiology
Background:
- Salvarsan, an early antisyphilitic drug, was administered in both acidic and alkaline solutions.
- The potential for precipitate formation in vivo and its physiological consequences were not fully understood.
- Previous studies suggested varying toxicity between acidic and alkaline salvarsan solutions.
Purpose of the Study:
- To investigate the in vivo precipitate formation of salvarsan in blood following intravenous injection.
- To compare the effects of acidic versus alkaline salvarsan solutions on blood and circulatory systems.
- To explore the fate of salvarsan precipitates within the circulatory system and potential adverse effects.
Main Methods:
- Intravenous injections of acidic and alkaline salvarsan solutions into rabbits and dogs.
- Analysis of blood samples from different parts of the heart and lungs for precipitate presence.
- Comparison of in vivo and in vitro precipitation reactions.
- Review of existing literature on salvarsan-induced toxicity and pathological findings.
Main Results:
- Acidic salvarsan solutions consistently produced precipitates in the right ventricle and lungs, but rarely in arterial blood.
- Alkaline salvarsan solutions did not produce precipitates in any tested blood samples (arterial, venous, or pulmonary).
- Precipitate formation occurred similarly in vitro, indicating a chemical reaction between salvarsan and blood components.
- Despite precipitate presence in the right heart and lungs, animals did not exhibit immediate fatal embolism, unlike some reported cases.
Conclusions:
- The pH of salvarsan solutions significantly influences precipitate formation in the bloodstream.
- Acidic salvarsan precipitates are largely retained in the pulmonary circulation, with unclear mechanisms preventing arterial embolism.
- Further research is needed to elucidate the fate of these precipitates and the reasons for differential toxicity observed in various studies.
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