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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 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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Rhabdomyolysis After Prolonged Tourniquet Application Is Associated with Reversible Acute Kidney Injury (AKI) in

Thomas J Walters1, Luciana N Torres1,2, Kathy L Ryan1

  • 1US Army Institute of Surgical Research, JBSA Fort Sam Houston, San Antonio, TX 78236, USA.

Biomedicines
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Summary

Battlefield extremity trauma causes severe rhabdomyolysis, a muscle breakdown condition. However, this study found that ischemic extremity injury in rats did not lead to irreversible acute kidney injury (AKI).

Keywords:
bone marrowcrush injuryglomerular filtration rateischemic injurytourniquet shocktrauma

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Area of Science:

  • Trauma and Injury Research
  • Renal Physiology
  • Muscle Pathophysiology

Background:

  • Extremity trauma, including ischemia from tourniquet application or crush injuries, is prevalent in battlefield scenarios.
  • Muscle damage releases toxins, potentially causing rhabdomyolysis and acute kidney injury (AKI).
  • Understanding the temporal relationship between ischemic injury, rhabdomyolysis, and AKI is crucial for effective treatment.

Purpose of the Study:

  • To characterize the time course of rhabdomyolysis and AKI following ischemic extremity injury over 72 hours.
  • To investigate the pathological sequelae of prolonged tourniquet application on muscle, bone marrow, and kidney tissues.

Main Methods:

  • Male Sprague Dawley rats were subjected to a 5-hour bilateral tourniquet (TK) application to induce ischemic injury (n=10).
  • Control rats (n=9) underwent identical procedures without tourniquet application.
  • Rhabdomyolysis indicators (creatine kinase) and renal function (glomerular filtration rate, urinary flow) were measured at baseline and 1.5, 24, 48, and 72 hours post-injury.

Main Results:

  • Tourniquet application resulted in muscle and bone marrow necrosis, and limb edema by 72 hours, but no kidney necrosis.
  • Creatine kinase levels increased 100-fold at 1.5 hours post-injury, indicating severe rhabdomyolysis.
  • Glomerular filtration rate decreased significantly at 1.5 hours but recovered by 24 hours, accompanied by increased urinary flow and alkalinization.

Conclusions:

  • Prolonged ischemic extremity injury in this rat model induces severe rhabdomyolysis.
  • Despite significant muscle damage and edema, the kidneys demonstrated functional recovery within 24 hours.
  • The findings suggest that ischemic extremity trauma may cause severe rhabdomyolysis without leading to irreversible acute kidney injury.