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unit 3
Potassium (K+) Lab Value
3.5 to 5.0 mEq/L
20 secs
Calcium (Ca2+) Lab Value
8.5 to 10.5 mg/dL
26 secs
Sodium (Na+) Lab Value
135-145 mEq/L
24 secs
Normal Electrolyte Lab Values
Potassium (K+)
3.5 to 5.0 mEq/L
Calcium (Ca2+)
8.5 to 10.5 mg/dL
Phosphate (PO43–)
2.5 to 4.5 mg/dL
Magnesium (Mg2+)
1.5 to 2.5 mEq/L
Sodium (Na+)
135 to 145 mEq/L
Chloride (Cl–)
95 to 105 mEq/L
2 mins
How to Interpret Acid Base Disorders
pH, pCO₂, HCO₃ (Bicarbonate)
Step 1
pH
Acidosis
Alkalosis
Step 2
pCO₂
Opposite Direction as pH
Respiratory Acidosis
Respiratory Alkalosis
Step 3
HCO₃ (Bicarbonate)
Same Direction as pH
Metabolic Acidosis
Metabolic Alkalosis
3 mins
Respiratory Acidosis
Hypoventilation
Increased PaCO2 > 45
Barbiturates Depress Central Respiratory Center of Brain
Opioids Depress Central Respiratory Center of the Brain
Airway Obstruction
Respiratory Muscle Weakness/Paralysis
3 mins
Respiratory Acidosis Assessment
Assessment
Decreased pH < 7.35
Increased PaCO2 > 45
Reduced Respirations
Anxiety
Change in LOC
Tachycardia
Cyanosis
Increased Electrolytes
ECG Changes
Muscle Weakness
Hyporeflexia
2 mins
Respiratory Alkalosis Assessment
Assessment
Increased pH > 7.45
Decreased PaCO2 < 35 mmHg
Hyperventilation
Brainstem Stimulation
Head Injury
Shock
Lightheadedness
Tingling Lips or Fingers
Trousseau's
Chvostek's Sign
Anxiety
2 mins
Metabolic Acidosis Assessment
Characteristics
Decreased pH < 7.35
Decreased HCO3 < 22
Signs & Symptoms
Abdominal Pain
CNS Depression
Coma
Hypotension
Arrhythmias
Increased Respirations
Kussmaul Respirations
Flushed, Warm, Dry Skin
Muscle Weakness
2 mins
Metabolic Alkalosis Assessment
Signs and Symptoms
Increased pH > 7.45
Increased HCO3 > 26
Excitable State
Arrhythmias
Paresthesias
Muscle Cramps
Muscle Weakness
Decreased Respiratory Effort
1 min
Respiratory Acidosis Interventions
Improve Respiration
Pharmacologic Interventions
Bronchodilators
Respiratory Stimulants
Drug Antagonists
Nonpharmacologic Interventions
Oxygen
Assisted Ventilation
Prevent Complications
1 min
Respiratory Alkalosis Interventions
Treat Underlying Cause
Mechanically Ventilated Patients
Decrease Tidal Volume and/or Respiratory Rate
Give Adequate Pain Control and Sedation
Hyperventilation Syndrome
Sedatives
Antidepressants
Considerations
Compensatory Drop in Serum Bicarbonate
Calming Breathing Exercises
Correct CO2 Slowly
2 mins
Metabolic Acidosis Interventions
Interventions
Raise Plasma pH > 7.20
Treat Underlying Cause
Sodium Bicarbonate
Considerations
Follow ABGs
Continuously Monitor Patient
2 mins
Metabolic Alkalosis Interventions
Interventions
Treat Underlying Cause
Stop Potassium (K+) Wasting Diuretics
Spironolactone
Acetazolamide
IV Fluids
Sodium Chloride
Replace Potassium (K+)
Considerations
Monitor Respiratory Rate
Monitor Heart Rate
Seizure Precautions
2 mins
Hypokalemia
Assessment
< 3.5 mEq/L
Muscle Weakness
Arrhythmia
U Wave
Ileus
Hyporeflexia
Interventions
IV K+ Infusion at 5-10 mEq/hr
Give Orally with Food
Nursing Considerations
Monitor Respiratory Status
3 mins
Hyperkalemia
Assessment
> 5.0 mEq/L K+
Abdominal Cramps
Muscle Weakness
Diarrhea
Arrhythmia
Tall, Peaked T Waves
Interventions
IV Calcium
Infusion of Glucose and Insulin
Loop or Thiazide Diuretics
Kayexalate
Dialysis
Prevention Education
2 mins
Hypocalcemia Causes
Hypoalbuminemia
Hypomagnesemia (Less Common Hypermagnesemia)
Hypovitaminosis D
Hypoparathyroidism
Medications
Hyperphosphatemia
Malnutrition
Acute Pancreatitis
Alkalosis
Sepsis
Chronic Kidney Disease
2 mins
Hypocalcemia
Muscle Spasms
Assessment
< 8.5 mg/dL Ca2+
Decreased Bone Density
Tetany
Chvostek's Sign
Trousseau's Sign
Increased DTR
ECG Changes
QT Prolongation
Considerations
Oral and IV Replacement of Ca2+
Seizure Precautions
2 mins
Hypocalcemia Treatments
Characteristics
Treat Underlying Disorder
Acute Treatments
IV Calcium Gluconate
Cardioprotective
Chronic Treatments
Calcium Carbonate
Calcium Citrate
Vitamin D Supplements
Considerations
Treat Hypomagnesemia
2 mins
Hypercalcemia Causes
Two CHIMPANZEES Acronym
Thyroid Disorders
Calcium Supplements
Hyperparathyroidism
Iatrogenic (Drugs, immobility)
Milk-Alkali Syndrome
Paget's Disease of Bone
Acromegaly or Addison's Disease
Neoplasms
Zollinger-Ellison Syndrome
Excessive Vitamin A
Excessive Vitamin D
Sarcoidosis
2 mins
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