Comprehensive Study Notes on Electrolyte Imbalances and ADH Disorders

Potassium ($K^+$) Overview

• Reference Range: The normal range for potassium is defined as $3.5$ to $5.5$.
• General Rule for Hyperkalemia: When potassium levels are high, "everything goes up" except for the heart rate and urine output.
• Hyperkalemia Signs (Hyper Signs):     * Diarrhea.     * Tachycardia.     * Tall T waves.
• Hypokalemia Signs (Hypo Signs):     * Fatigue.     * Hypotension.     * Bradycardia.     * Decreased urinary rate.
• Critical Administration Warning: Never give Potassium via $IV$ bolus.
• Treatments for Hyperkalemia:     * Regular insulin.     * Kayexalate, also known by the generic name Sodium Polystyrene Sulfonate.

Calcium ($Ca^{2+}$) Overview

• Reference Range: The normal range for calcium is defined as $8.6$ to $10$.
• Hypercalcemia signs ("Bones, Stones, and Groans"):     * Bones: Bone pain occurs when calcium levels are too high.     * Stones: Renal stones (Kidney stones).     * Groans: Abdominal pain.
• Hypocalcemia signs (The 3 Ts):     * Twitches.     * Trousseau's Sign.     * Tetany (specifically seizures and tachycardia).     * The general rule for Hypocalcemia is that the signs are the "opposite of the prefix," meaning when calcium is low, physical signs/activity levels go up.
• Physiological Regulation: The Parathyroid Gland helps the body absorb calcium.
• Treatments for Hypocalcemia:     * Take calcium supplements $30$ minutes before a meal.     * Increase intake of dairy products or other foods high in calcium.
• Treatments for Hypercalcemia:     * Administration of Calcitonin.     * Dialysis.

Magnesium ($Mg^{2+}$) Overview

• Reference Range: The normal range for magnesium is defined as $1.6$ to $2.6$.
• The Prefix Rule: Magnesium signs generally follow the rule of being the "opposite of the prefix."     * Hypermagnesemia (High levels): Physical signs go down. This includes decreased respirations, drowsiness, and bradycardia. Note: High BP is also mentions in the context of hyper signs being opposite.     * Hypomagnesemia (Low levels): Physical signs go up. This includes seizures and tachycardia.
• Treatments for Magnesium Imbalance:     * For Hypomagnesemia: Administer Magnesium via $IV$.     * For Hypermagnesemia: Stop the products that are causing the magnesium level to increase, such as antacids.

Sodium ($Na^+$) and Fluid Balance

• Reference Range: The normal range for sodium is defined as $135$ to $145$.
• Hypernatremia: Characterized by dehydration and dry mucous membranes.
• Hyponatremia: Characterized by sodium overload or fluid overload, leading to confusion.

Lithium and Bipolar Disorder

• Reference Range: The therapeutic range for lithium is $0.6$ to $1.2$.
• Lithium Toxicity Signs:     * Slurred speech.     * Unsteady gait.     * Emotional changes (guilt).     * Confusion.     * Lethargy.
• Treatment for Lithium Issues:     * Modify diet to reduce sodium.     * Modify fluid intake/fluid changes if necessary.

Diabetes Insipidus (DI) vs. Syndrome of Inappropriate Antidiuretic Hormone (SIADH)

• Antidiuretic Hormone (ADH) Function: ADH instructs the brain and body to hold onto water and retain fluids.
• Commonalities: Both conditions represent a problem with the Antidiuretic Hormone (ADH).
• Diabetes Insipidus (DI):     * Definition: Too little ADH.     * Urine Presentation: The term "Insipidus" describes urine that is clear, colorless, odorless, and tasteless. The person puts out a high volume of urine.     * Signs/Symptoms: Polyuria (up to $20\,liters$ per day), dehydration.     * Vital Signs: Blood Pressure ($BP$) will be low; Heart Rate ($HR$) will compensate and be high.
• Syndrome of Inappropriate Antidiuretic Hormone (SIADH):     * Definition: Too much ADH.     * Signs/Symptoms: Fluid overload, Oliguria (very little urine output).     * Electrolyte Impact: Sodium levels will go down ($< 135$), and the client will be confused.     * Treatment: Diuretics, specifically of the Osmotic class, to remove fluid from the brain.