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Related Concept Videos

Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

Acute Kidney Injury IV: Diagnostic Studies and Prevention

Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
Acute Kidney Injury V: Interprofessional Care01:20

Acute Kidney Injury V: Interprofessional Care

Acute Kidney Injury (AKI) requires a collaborative healthcare approach to restore renal function and prevent complications. Essential management strategies involve monitoring fluid and electrolyte balance, adjusting medications, initiating dialysis when necessary, and providing nutritional support.Fluid and Electrolyte ManagementFluid Monitoring: Regularly monitoring body weight, central venous pressure, and urine output helps detect fluid imbalances early. Patient intake and output are...
Acute Kidney Injury I: Introduction01:22

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Acute Kidney Injury II: Pathophysiology01:29

Acute Kidney Injury II: Pathophysiology

Acute kidney injury (AKI) causes are categorized into three primary categories based on the location of the injury: prerenal, intrarenal (or intrinsic), and postrenal causes. This classification guides clinical management and illustrates how different pathways can impair kidney function.Etiology and Pathophysiology of Acute Kidney Injury1. Prerenal causesEtiology: Prerenal Acute Kidney Injury, the most common type, occurs when reduced blood flow to the kidneys decreases filtration capacity...
Acute Kidney Injury VI: Nursing Management01:22

Acute Kidney Injury VI: Nursing Management

Acute Kidney Injury (AKI) results in an inability to maintain fluid, electrolyte, and acid-base balance. Effective nursing management is critical in improving patient outcomes and includes comprehensive patient assessment and targeted interventions.Comprehensive Patient AssessmentA detailed history collection is essential, focusing on any recent infections, nephrotoxic medication use, or chronic conditions such as hypertension and diabetes that may contribute to AKI. During the physical...
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Acute Kidney Injury III: Clinical Manifestations

Acute Kidney Injury (AKI) progresses through distinct clinical phases: the oliguric, diuretic, and recovery phases, each marked by unique manifestations and challenges.Oliguric Phase:The oliguric phase is the initial stage of AKI, typically lasting 10 to 14 days. This phase is marked by a significant reduction in urine output, usually less than 400 mL per day, indicating decreased kidney function. Fluid retention is a prominent feature, leading to symptoms such as edema, hypertension, and...

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Modeling Hypoxia/Reoxygenation Injury in Proximal Tubular Epithelial Cells
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Cellular adaptive changes in AKI: mitigating renal hypoxic injury.

Samuel N Heyman1, Roger G Evans, Seymour Rosen

  • 1Department of Medicine, Hadassah Hebrew University Hospital, Jerusalem, Israel. Heyman@cc.huji.ac.il

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
|May 2, 2012
PubMed
Summary

Kidney hypoxia during sepsis triggers adaptive responses. A novel mechanism involves reduced mitochondrial activity, preserving oxygenation and kidney structure despite reduced blood flow.

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Area of Science:

  • Nephrology
  • Cellular Biology
  • Pathophysiology

Background:

  • Hypoxia is a key factor in acute kidney injury (AKI) from ischemia, toxins, and sepsis.
  • The kidney possesses adaptive mechanisms to mitigate hypoxic insults, potentially leading to sublethal cell injury.
  • Downregulation of oxygen consumption for tubular transport is a potential adaptive response to maintain renal oxygenation and cellular integrity.

Purpose of the Study:

  • To explore a novel mechanism preventing tubular damage during sepsis-induced hypoxia.
  • To investigate the role of mitochondrial biogenesis and oxygen consumption in renal adaptation to sepsis.
  • To understand how the kidney preserves oxygenation and structural integrity despite reduced oxygen delivery during sepsis.

Main Methods:

  • Utilized expression profiling of kidney RNA in endotoxemic rodents.
  • Conducted complementary in vitro studies.
  • Examined PGC-1α knockout mice to assess the role of PPARγ coactivator-1α.

Main Results:

  • Sepsis led to a decline in PPARγ coactivator-1α (PGC-1α) expression and its downstream genes involved in oxidative phosphorylation.
  • Observed a paradoxical preservation of kidney oxygenation and structural integrity in sepsis.
  • Demonstrated that reduced mitochondrial respiration and oxygen consumption may explain preserved renal function.

Conclusions:

  • Resetting of mitochondrial respiration and oxygen consumption is a crucial adaptive response to hypoxic stress during sepsis.
  • This adaptive mechanism helps mitigate evolving hypoxic injury in the kidney, even with transient renal dysfunction.
  • The findings add to the understanding of renal adaptive responses during sepsis-induced hypoxia.