In crush injuries with rhabdomyolysis risk, what is the recommended fluid strategy?

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Multiple Choice

In crush injuries with rhabdomyolysis risk, what is the recommended fluid strategy?

The key idea here is that crush injuries with rhabdomyolysis risk require aggressive IV fluid resuscitation to protect the kidneys and manage potassium. When muscle tissue is damaged, substances like myoglobin and potassium flood into the bloodstream. Myoglobin can clog renal tubules and cause acute kidney injury, especially if a patient is intravascularly dehydrated. Giving large amounts of isotonic saline early helps restore and maintain blood flow to the kidneys, dilutes nephrotoxic pigments, and promotes urine production to flush out myoglobin. A practical target is to achieve a urine output roughly 0.5 to 1 mL/kg per hour in adults, which reflects adequate perfusion and helps minimize kidney injury. Some clinicians consider urine alkalinization with bicarbonate in select cases to reduce myoglobin precipitation, but the mainstay is volume expansion with careful monitoring for signs of fluid overload. Why other approaches fall short: restricting fluids or giving no fluids worsens dehydration and raises the risk of kidney injury; using diuretics without ensuring sufficient circulating volume can further reduce blood pressure and kidney perfusion. The emphasis is on maintaining a high, balanced intravascular volume to protect the kidneys and blunt hyperkalemia risk.

The key idea here is that crush injuries with rhabdomyolysis risk require aggressive IV fluid resuscitation to protect the kidneys and manage potassium. When muscle tissue is damaged, substances like myoglobin and potassium flood into the bloodstream. Myoglobin can clog renal tubules and cause acute kidney injury, especially if a patient is intravascularly dehydrated. Giving large amounts of isotonic saline early helps restore and maintain blood flow to the kidneys, dilutes nephrotoxic pigments, and promotes urine production to flush out myoglobin.

A practical target is to achieve a urine output roughly 0.5 to 1 mL/kg per hour in adults, which reflects adequate perfusion and helps minimize kidney injury. Some clinicians consider urine alkalinization with bicarbonate in select cases to reduce myoglobin precipitation, but the mainstay is volume expansion with careful monitoring for signs of fluid overload.

Why other approaches fall short: restricting fluids or giving no fluids worsens dehydration and raises the risk of kidney injury; using diuretics without ensuring sufficient circulating volume can further reduce blood pressure and kidney perfusion. The emphasis is on maintaining a high, balanced intravascular volume to protect the kidneys and blunt hyperkalemia risk.

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