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Acute Kidney Injury II: Pathophysiology01:29

Acute Kidney Injury II: Pathophysiology

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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...
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Acute Kidney Injury I: Introduction01:22

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Introduction:Acute Kidney Injury (AKI) describes a swift decrease in kidney function occurring over hours to days, characterized by the kidneys' failure to remove waste products from the bloodstream. This leads to dangerous complications like metabolic acidosis, fluid overload, and electrolyte imbalances, such as hyperkalemia, which can cause life-threatening arrhythmias. AKI is common in both hospital and outpatient settings, often triggered by dehydration, sepsis, or exposure to nephrotoxic...
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Acute Kidney Injury IV: Diagnostic Studies and Prevention01:30

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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...
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Acute Kidney Injury III: Clinical Manifestations01:29

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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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Acute Kidney Injury V: Interprofessional Care01:20

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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...
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Acute Kidney Injury VI: Nursing Management01:22

Acute Kidney Injury VI: Nursing Management

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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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A Quantitative Detection Method for MicroRNAs in the Kidney of an Ischemic Kidney Injury Mouse Model
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Unique Transcriptional Programs Identify Subtypes of AKI.

Katherine Xu1, Paul Rosenstiel2, Neal Paragas3

  • 1Departments of *Medicine, Division of Nephrology.

Journal of the American Society of Nephrology : JASN
|December 29, 2016
PubMed
Summary

Acute kidney injury (AKI) has two forms: intrinsic kidney injury (iAKI) and volume-depleted AKI (vAKI). These distinct conditions involve different biological pathways and should be classified separately for accurate diagnosis and treatment.

Keywords:
acute kidney injurybiomarkersrenal ischemiatranscriptional profilingvolume depletion

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Area of Science:

  • Nephrology
  • Molecular Biology
  • Genomics

Background:

  • Current acute kidney injury (AKI) diagnostics rely on serum creatinine and urine output, which lack etiological specificity.
  • The distinction between intrinsic kidney injury (iAKI) and volume-depleted AKI (vAKI) and their shared pathogenesis remains unclear.
  • Existing metrics do not differentiate the underlying causes of acute decreases in kidney excretory function.

Purpose of the Study:

  • To investigate the distinct pathogenetic mechanisms of iAKI and vAKI.
  • To determine if iAKI and vAKI share common molecular pathways or should be considered separate entities.
  • To identify potential molecular biomarkers for differentiating iAKI from vAKI.

Main Methods:

  • Creation of mouse models for iAKI and vAKI with comparable increases in serum creatinine.
  • Laser microdissection of specific kidney regions followed by RNA sequencing.
  • Analysis of gene expression patterns in kidney tissues and human urine samples.

Main Results:

  • Thousands of genes exhibited specific responses to either iAKI or vAKI, with minimal overlap.
  • Activated gene sets involved different, functionally unrelated signaling pathways and were localized to distinct kidney regions.
  • Distinct gene expression profiles in human urine were identified as potential biomarkers for iAKI or vAKI, but not both.

Conclusions:

  • Intrinsic kidney injury (iAKI) and volume-depleted AKI (vAKI) are biologically distinct conditions.
  • Molecular analyses reveal significant differences in gene expression and signaling pathways between iAKI and vAKI.
  • Current diagnostic definitions of acute kidney injury require clarification based on molecular distinctions between iAKI and vAKI.