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Tetany is a nerve hyperexcitability disorder characterised by involuntary muscle contractions and overly stimulated peripheral nerves. It is caused by electrolyte imbalances, most often low blood calcium levels (hypocalcaemia). Hypocalcaemia can be caused by hyperventilation, which leads to a decrease in free ionised calcium. This occurs because calcium ions interact with the exterior surface of sodium channels in the plasma membrane of nerve cells and hypocalcaemia effectively increases resting potential. Therefore, hyperventilation and calcium deficiency can cause tetany.
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What You'll Learn
- Hypocalcemia, or low calcium levels in the blood, is the predominant cause of tetany
- Hypocalcemia can be caused by a decreased level of parathyroid hormone (PTH) or increased resistance to its activity
- Hyperventilation can cause tetany by inducing respiratory alkalosis, which changes how the nervous system fires
- Tetany can be caused by other metabolic irregularities, such as electrolyte imbalances and disorders affecting the acid-base balance
- Severe tetany requires immediate medical treatment, usually involving intravenous (IV) calcium replacement
Hypocalcemia, or low calcium levels in the blood, is the predominant cause of tetany
Tetany is a nerve hyperexcitability disorder characterised by involuntary muscle contractions and overly stimulated peripheral nerves. It is caused by electrolyte imbalances, most often hypocalcemia, or low calcium levels in the blood.
Hypocalcemia is the predominant cause of tetany. Calcium ions play an important role in stabilising the resting membrane potential of neurons, preventing their spontaneous activation. When calcium levels are low, the threshold for activation decreases, leading to increased neuronal excitability. This results in involuntary muscle contractions, which are the defining symptom of tetany.
The symptoms of tetany can vary in severity. Mild symptoms include numbness around the mouth, muscle spasms, and a tingling or burning sensation in the hands and feet (paresthesia). More severe symptoms include laryngospasm (spasms of the vocal cords), seizures, and decreased cardiac function, which can be life-threatening.
The treatment for tetany aims to correct the underlying electrolyte imbalance and restore normal calcium levels. Mild cases of hypocalcemia can be treated with oral calcium supplements, vitamin D supplementation, and magnesium tablets. Severe cases of tetany may require immediate medical attention, including intravenous calcium replacement.
It is important to note that tetany is a symptom, not a disease, and can be caused by various underlying conditions. These include parathyroid disease, kidney failure, vitamin D deficiency, and certain medications. Therefore, long-term treatment goals should focus on diagnosing and addressing the root cause of the condition.
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Hypocalcemia can be caused by a decreased level of parathyroid hormone (PTH) or increased resistance to its activity
Hypocalcemia, or low calcium levels in the blood, is the primary cause of tetany. Calcium plays an important role in neuronal activity, muscular contraction, hormone secretion, and blood coagulation. It helps the nerves and brain to work properly, and it is needed to control heart rhythm and blood pressure.
Hypocalcemia can be caused by a decreased level of parathyroid hormone (PTH) or, more rarely, increased resistance to its activity. This condition is known as hypoparathyroidism. The parathyroid glands, located in the neck near the thyroid gland, are responsible for producing PTH. PTH helps to regulate the levels of calcium and phosphorus in the body. When the body does not produce enough PTH, calcium levels drop, and phosphorus levels rise.
There are several reasons why the parathyroid glands may not produce enough PTH. One common cause is neck surgery, which can damage or remove the parathyroid glands. Hypoparathyroidism can also be caused by autoimmune disorders, where the body's defences attack the parathyroid glands, or genetic conditions involving the parathyroid gland, such as DiGeorge syndrome. Additionally, low levels of magnesium in the blood can affect the function of the parathyroid glands, leading to decreased PTH production.
In summary, hypocalcemia is caused by low levels of calcium in the blood, which can be a result of decreased PTH production by the parathyroid glands or increased resistance to PTH activity. This leads to a range of symptoms associated with tetany, including involuntary muscle contractions, overly stimulated peripheral nerves, and tingling or burning sensations in the hands and feet.
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Hyperventilation can cause tetany by inducing respiratory alkalosis, which changes how the nervous system fires
Tetany is a nerve hyperexcitability disorder characterised by involuntary muscle contractions. It is caused by a calcium deficiency, also known as hypocalcemia, which is the most common cause of tetany. Calcium plays a crucial role in neuronal activity, muscular contraction, hormone secretion, and blood coagulation. A decrease in calcium levels increases the permeability of neuronal membranes to sodium ions, causing a progressive depolarization and increasing the possibility of action potentials. This results in increased neuronal excitability.
Hyperventilation can induce respiratory alkalosis, which can also lead to tetany. During hyperventilation, the body gets rid of too much carbon dioxide, causing the blood to become alkaline. This change in blood pH can alter the functioning of the nervous system, leading to tetany.
Respiratory alkalosis can also be caused by other factors such as anxiety, which can lead to hyperventilation and subsequently tetany. Additionally, metabolic alkalosis associated with conditions like Gitelman syndrome and Bartter syndrome can contribute to tetany.
The treatment for tetany aims to correct the underlying electrolyte imbalance, especially calcium deficiency. Mild cases of hypocalcemia can be managed with calcium supplements, vitamin D supplements, and magnesium tablets. Severe cases of tetany require immediate medical attention and may involve intravenous calcium replacement therapy.
While tetany is often associated with hypocalcemia, it is important to note that other metabolic abnormalities can also contribute. For example, magnesium deficiency, hypokalemia, and disorders affecting the acid-base balance can play a role in the development of tetany. Therefore, treating tetany requires addressing the specific underlying causes, which can vary among individuals.
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Tetany can be caused by other metabolic irregularities, such as electrolyte imbalances and disorders affecting the acid-base balance
Tetany is a symptom that involves involuntary muscle contractions and overly stimulated peripheral nerves. It is caused by a deficiency of calcium in the blood, known as hypocalcemia, which is the most common cause of tetany. Calcium ions play an important role in stabilizing the resting membrane potential of neurons, preventing their spontaneous activation. When calcium levels are low, the threshold for activating neurons decreases, causing increased neuromuscular excitability and leading to involuntary muscle contractions.
However, tetany can also be caused by other metabolic irregularities, such as electrolyte imbalances and disorders affecting the acid-base balance. Electrolytes are substances that carry an electrical charge when dissolved in water, and they are crucial for the proper functioning of nerve and muscle cells. Potassium, for example, is an electrolyte vital for nerve and muscle cell function, especially in the heart. A deficiency in magnesium, another electrolyte, can also lead to tetany.
Disorders affecting the acid-base balance, such as metabolic alkalosis, can also cause tetany. Metabolic alkalosis occurs when there is an excess of bases or alkali in the blood and body fluids, resulting in an elevated pH level. This can be caused by vomiting, chronic kidney disease, or respiratory alkalosis, which is triggered by hyperventilation. Hyperventilation causes the body to expel too much carbon dioxide, leading to decreased carbon dioxide levels in the blood and, consequently, tetany.
In summary, tetany is primarily caused by hypocalcemia but can also result from other metabolic irregularities, including electrolyte imbalances and disorders affecting the acid-base balance. These disorders, such as metabolic alkalosis and hyperventilation-induced respiratory alkalosis, can disrupt the body's delicate acid-base balance and contribute to the development of tetany.
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Severe tetany requires immediate medical treatment, usually involving intravenous (IV) calcium replacement
Tetany is a symptom characterised by the involuntary contraction of muscles, which can lead to painful muscle cramps, spasms of the voice box (laryngospasm), and sensory disturbances. The usual cause of tetany is a deficiency of calcium in the blood, or hypocalcemia. Hypocalcemia can be caused by low levels of parathyroid hormone (hypoparathyroidism) or vitamin D in the body, as well as magnesium deficiency.
While mild cases of tetany can be treated with oral calcium supplements, vitamin D supplements, and magnesium tablets, severe tetany requires immediate medical treatment. This is because severe tetany can lead to life-threatening complications, such as rhabdomyolysis, a condition caused by muscle breakdown and muscle death. In these cases, intravenous (IV) calcium replacement is usually required to replenish calcium levels and resolve symptoms.
IV calcium replacement typically involves the administration of calcium gluconate, a calcium salt that is crucial in managing hypocalcemia. The recommended dosage is 100-300 mg of elemental calcium (calcium gluconate contains 90 mg of elemental calcium per 10 mL, while calcium chloride contains 272 mg per 10 mL) in 50-100 mL of 5% dextrose in water (D5W) over 5-10 minutes. This dosage can be repeated every 10-60 minutes until symptoms resolve.
It is important to note that caution should be exercised when administering calcium chloride intravenously, as it delivers higher amounts of calcium and should be administered via central venous access. Additionally, the clinical team must monitor magnesium levels during calcium repletion, as magnesium deficiency is a common cause of treatment-resistant hypocalcemia.
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Frequently asked questions
Tetany is a nerve hyperexcitability disorder characterised by involuntary muscle contractions and overly stimulated peripheral nerves.
Calcium ions play an important role in stabilising the resting membrane potential of neurons, preventing their spontaneous activation. A calcium deficiency, or hypocalcaemia, causes increased neuromuscular excitability by decreasing the threshold needed for the activation of neurons.
Common, mild symptoms of tetany include numbness around the mouth, muscle spasms, a tingling or burning sensation in the hands and feet (paresthesia), and painful, generalised muscle cramps.
Hyperventilation causes respiratory alkalosis (high blood pH), which leads to changes in the way the nervous system fires. This results in neuronal irritability, which can cause tetany.
