Calcium Imbalance Vocabulary
Overview of Calcium Homeostasis
- Normal Calcium Range: The standard physiological range for calcium levels in the body is 8.5 to 10.5.
- Primary Functions of Calcium:
* Muscle Contraction: Facilitates the necessary movements within the muscular system.
* Heart Function: Essential for the proper electrical and mechanical operation of the cardiac muscle.
* Nerve Transmission: Plays a critical role in the sending of signals throughout the nervous system.
* Bone Strength: Serves as a foundational component for skeletal integrity and density.
Hypocalcemia
- Definition: Hypocalcemia is defined as a calcium level lower than 8.5.
- Pathophysiology: In a state of low calcium, the nerves and muscles become over-excited. Specifically, low calcium causes the nerves to fire too much.
- Causes of Hypocalcemia:
* Low Vitamin D levels.
* Kidney disease.
* Hypoparathyroidism.
* Pancreatitis.
* Poor nutrition.
* Multiple blood transfusions.
- Symptoms and Clinical Presentation:
* Muscle spasms.
* Tetani (tetany).
* Twitching.
* Tingling sensations located specifically around the mouth and fingers.
* Hyperactive reflexes.
- Severe Signs and Complications:
* Seizures.
* Laryngospasms.
* Dyswitneas (dysrhythmias).
- Diagnostic Clinical Signs:
* shovedex sign: Performed by tapping the cheek, which results in a partial facial twitch.
* Tusa sign: Observed when applying a blood pressure cuff; it leads to "cough and flakes" and hand spams (spasms).
- Electrocardiogram (ECG) Changes: A significant finding on an ECG for hypocalcemia is a longe (long) QT interval.
- Nursing Interventions for Low Calcium:
* Administration of calcium supplements.
* Implementation of seizure precautions.
* Constant monitoring of the patient's airway.
* Continuous monitoring of the ECG.
- High-Calcium Dietary Sources:
* Milk.
* Cheese.
* Yogurt.
* Green vegetables.
Hypercalcemia
- Definition: Hypercalcemia (hyperglycemia was mentioned, but hypercalcemia is the subject) is defined as a calcium level above 10.5.
- Pathophysiology: In states of high calcium, everything in the body becomes "low and slow." Excess calcium acts to slow down the nerves and muscle functions.
- Causes of Hypercalcemia:
* Hyperparathyroidism.
* Cancer.
* Excessive intake of calcium.
* Excessive intake of Vitamin D.
* Prolonged periods of immobility.
- Symptoms and Clinical Presentation:
* Weak muscles.
* Decreased reflexes.
* General fatigue.
- Gastrointestinal (GI) Signs:
* Constipation.
* Nausea.
- Renal and Cardiac Signs:
* Development of kidney stones.
* Heart dyslipneias (dysrhythmias).
- Electrocardiogram (ECG) Changes: A characteristic finding for hypercalcemia is a shortness (shortened) QT interval.
- Nursing Interventions for High Calcium:
* Increase fluid intake.
* Promote coherence mobility (encourage mobility).
* Monitor heart activity.
* Administer diuretics as ordered.
Memory Aids and Summary
- Easy mammary trick for Hypocalcemia:
* Low calcium equals an over-excited nerve system.
* Watch for twitching, hyperactive reflexes, and tetani.
* Positive shovedex and Tusa (juzo) signs.
- Easy mammary trick for Hypercalcemia:
* High calcium slows the body down.
* Watch for physical weakness, decreased reflexes, constipation, and the formation of kidney stones.
- Key Distinction Summary:
* Hypocalcemia: Low calcium makes the nerves overexcited.
* Hypercalcemia: High calcium slows everything down.