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Glomerular dynamics and morphologic changes in the generalized Shwartzman reaction in postpartum rats
The Journal of Clinical Investigation
|May 1, 1981
Summary
Postpartum rats are more susceptible to acute kidney injury from endotoxin, experiencing severe drops in glomerular filtration rate. Neurohumoral agents, not fibrin deposition, primarily cause early renal dysfunction in the generalized Shwartzman reaction.
Area of Science:
- Nephrology
- Pathophysiology
- Endocrinology
Background:
- The generalized Shwartzman reaction is a severe condition that can lead to acute renal failure.
- Postpartum physiological changes may increase susceptibility to this reaction.
Purpose of the Study:
- To investigate the roles of glomerular functional and morphologic changes in acute renal failure during the generalized Shwartzman reaction in postpartum rats.
- To differentiate the contributions of glomerular dynamics and fibrin deposition to early renal dysfunction.
Main Methods:
- Compared renal function and glomerular dynamics in postpartum and virgin Munich Wistar rats after endotoxin infusion.
- Assessed platelet count, fibrinogen levels, renal blood flow, glomerular filtration rate, and single nephron filtration rates.
- Investigated the effect of angiotensin II infusion on renal function prior to endotoxin challenge.
Main Results:
- Postpartum rats exhibited a significantly greater decline in glomerular filtration rate (93%) compared to virgin rats (24%) after endotoxin infusion.
- Consumption coagulopathy was evident in postpartum rats, with significant changes in platelet count and fibrinogen levels.
- Glomerular filtration rate and renal blood flow decreased markedly, accompanied by increased afferent and efferent arteriolar resistances.
- Angiotensin II pre-infusion protected glomerular filtration rate despite similar coagulopathy and fibrin deposition, suggesting a neurohumoral role.
Conclusions:
- Early renal dysfunction in the generalized Shwartzman reaction in postpartum rats is primarily driven by significant alterations in glomerular dynamics induced by neurohumoral agents.
- Glomerular fibrin deposition plays a less significant role in the early pathogenesis of renal failure in this model.
- These findings highlight the importance of hemodynamic factors in acute kidney injury associated with the Shwartzman reaction.
