Evaluation and Treatment of Acidosis, Electrolyte Imbalances, Intoxications, Fluid Overload, and Uremia
Immediate management should target the time-critical physiology causing cardiopulmonary instability. Renal replacement therapy (RRT) should be initiated emergently for life-threatening changes in fluid, electrolyte, and acid-base balance. [1]
Initial Stabilization and Diagnostic Workup
Stabilization should follow an ABC approach with rapid assessment for shock, hypoventilation, seizure activity, and cardiac dysrhythmia. [1]
Serum and bedside data should be obtained to define acid-base status, electrolyte derangements, kidney function, and toxin effect. [1]
Key tests should include the following: arterial or venous blood gas for pH and PaCO2, basic metabolic panel for electrolytes, glucose, complete blood count, ECG, serum creatinine/BUN, and urinalysis when applicable. [1]
If intoxication is possible, history should be supplemented with medication containers, scene information, collateral history, and focused physical examination for toxidromes. [2]
If acidemia is present, respiratory alkalosis or mixed disorders should be excluded by blood gas interpretation. [3]
Acidosis Management
Acidosis should be treated by correcting the underlying cause and by assessing whether definitive therapy is required due to severity or kidney failure. [3]
In metabolic acidosis with pH ≤ 7.20, sodium bicarbonate use is suggested in intensive care settings, particularly with moderate to severe acute renal insufficiency. [3]
In severe metabolic acidosis, sodium bicarbonate administration has a limited evidence base for mortality benefit in general ICU populations, with potential signal in patients with acute kidney injury. [4]
Bicarbonate therapy should not be used as a substitute for definitive management of kidney failure, ventilation failure, or toxin removal. [3]
Electrolyte Imbalance Management
Electrolyte management should be synchronized with ECG findings because acute potassium abnormalities cause immediate dysrhythmia risk. [5]
For suspected or confirmed hyperkalemia with ECG changes or severe elevation, treatment should be initiated before confirmatory repeat sampling when the clinical scenario indicates critical hyperkalemia. [5]
Hyperkalemia should be stabilized by the following sequence:
- Myocardial membrane stabilization with intravenous calcium gluconate (example pediatric guideline dosing: 0.15 mmol/kg of 10% calcium gluconate; dosing limits depend on institution and patient size). [5]
- Intracellular shift of potassium with insulin plus glucose and inhaled/nebulized salbutamol. [5]
- Potassium removal with definitive elimination strategy using dialysis for refractory or life-threatening electrolyte/acid-base/volume physiology. [1]
Intoxication Evaluation and Initial Treatment
Intoxication should be assessed with immediate supportive care and targeted decontamination only for eligible toxins and clinical presentations. [2]
Single-dose activated charcoal is supported as a decontamination strategy in selected patients based on timing and toxin characteristics. [2]
Gastric decontamination selection should incorporate expected toxin type, time from ingestion, airway protection status, and risk of aspiration. [2]
Fluid Overload Management
Fluid overload should be treated by balancing resuscitation needs with reduction of ongoing fluid accumulation. [1]
When fluid overload is life-threatening or refractory, emergent RRT should be initiated to meet fluid and solute balance goals. [1]
In settings requiring RRT, modality selection should be based on hemodynamic stability and local expertise. [1]
Uremia Management and RRT Indications
Uremic manifestations should be treated by addressing the underlying kidney failure with RRT when conservative measures are insufficient. [1]
RRT initiation should be guided by life-threatening physiology and inability to maintain adequate acid-base, electrolyte, solute, and fluid balance with conservative management. [1]
RRT should be provided to achieve goals of electrolyte, acid-base, solute, and fluid balance that meet patient needs. [1]
Common Pitfalls to Avoid
RRT should not be delayed when life-threatening electrolyte, acid-base, or fluid abnormalities are present despite conservative therapy. [1]
Bicarbonate use should not be applied broadly to all metabolic acidosis cases without confirming metabolic acidosis severity and mixed disorder exclusion by blood gas analysis. [3]
Hyperkalemia therapy should not rely on potassium-lowering measures that only shift potassium intracellularly without a plan for definitive potassium removal when required. [5]
Decontamination strategies should not be performed without toxin eligibility assessment and airway risk evaluation. [2]
Targets and Goals of Therapy
The goals of therapy should include restoration of acid-base stability, normalization or safe range of critical electrolytes, elimination of toxic solute burden when applicable, and achieving appropriate fluid balance. [1]
For hyperkalemia, immediate goals should include ECG stabilization through reduction of membrane excitability and sustained lowering of serum potassium with definitive elimination when indicated. [5]
For severe metabolic acidosis, the clinical goal should be correction of profound acidemia while definitive causes are addressed. [3]