Pregnancy is a delicate physiological stage that requires continuous medical care to maintain maternal health and ensure fetal well-being. Although pregnancy is generally a normal physiological process, it may occasionally be complicated by rare medical conditions that require early diagnosis and appropriate treatment. One such condition is Rhabdomyolysis During Pregnancy, an uncommon disorder characterized by the breakdown of skeletal muscle cells and the release of their contents into the bloodstream. This can lead to electrolyte imbalances and impaired kidney function and, in severe cases, may progress to complications that threaten maternal health.Rhabdomyolysis during pregnancy is particularly important because of its rarity and the variety of potential causes, including severe dehydration, hyperemesis gravidarum, electrolyte disturbances, infections, muscle injuries, and certain medications. Diagnosing this condition can also be challenging because some of its symptoms may resemble common pregnancy-related symptoms or those of other medical conditions that can occur during pregnancy.Therefore, at Dalili Medical, it is important to understand the causes, symptoms, and diagnostic methods of rhabdomyolysis during pregnancy, as well as its potential risks to both the mother and fetus. Reviewing the appropriate treatment approaches and medical follow-up strategies is also essential. Early diagnosis and proper clinical management may help reduce complications and improve health outcomes for both the mother and her baby.

What Is Rhabdomyolysis During Pregnancy?

Rhabdomyolysis is a rare condition during pregnancy. It may result from several factors, including severe dehydration, electrolyte disturbances, infections, muscle injuries, or the use of certain medications that can affect muscle tissue.

Is Pregnancy Itself a Cause of Rhabdomyolysis?

Pregnancy is not a common direct cause of rhabdomyolysis. However, certain pregnancy-related conditions and complications may increase the risk of developing it, such as severe vomiting during pregnancy, dehydration, and disturbances in blood potassium levels.

Can Severe Vomiting During Pregnancy Lead to Rhabdomyolysis?

Yes. In rare cases, repeated and severe vomiting during pregnancy may lead to rhabdomyolysis, particularly when it causes severe dehydration, malnutrition, and electrolyte imbalances, especially hypokalemia (low potassium levels). These disturbances may impair muscle function and lead to muscle cell breakdown.

Is Rhabdomyolysis an Inherited Disease?

Not necessarily. Most cases of rhabdomyolysis are associated with acquired causes, such as muscle injuries, infections, electrolyte disturbances, or certain medications. However, some inherited muscle diseases and metabolic disorders may increase susceptibility to this condition.

What Are the Main Symptoms of Rhabdomyolysis During Pregnancy?

The most common symptoms include severe muscle pain, muscle weakness or swelling, and unusual fatigue. Urine may also turn dark brown or tea-colored due to the presence of myoglobin. However, not all affected women experience all these symptoms.

Can Rhabdomyolysis Occur Without Changes in Urine Color?

Yes. Rhabdomyolysis can occur without any noticeable change in urine color, as dark urine is not a requirement for diagnosis. Urine may appear normal in both color and volume despite muscle breakdown. Therefore, diagnosis depends on symptoms and laboratory investigations rather than urine color alone.

What Is the Primary Test Used to Diagnose Rhabdomyolysis?

Measuring the blood level of creatine kinase (CK or CPK) is the primary laboratory test used to diagnose rhabdomyolysis. The condition is generally indicated by a CK level greater than five times the upper limit of normal or above 1,000 units/L, taking the clinical context into account.

Additional investigations include:

• Assessment of kidney function.

• Measurement of blood electrolyte levels.

• Urinalysis.

• Additional tests, when necessary, to identify the underlying cause and determine the severity of the condition.

Can Rhabdomyolysis Be Confused with Preeclampsia or HELLP Syndrome?

Yes. Some symptoms and laboratory findings may overlap, but these conditions differ in their underlying mechanisms and causes.

Distinguishing between them requires a comprehensive clinical assessment, including blood pressure measurement, liver function tests, platelet counts, creatine kinase levels, kidney function tests, and other investigations as determined by the treating physician.

Accurate diagnosis helps ensure appropriate treatment and reduces the risk of complications affecting both the mother and fetus.

Types of Rhabdomyolysis During Pregnancy

First: Classification of Rhabdomyolysis According to Its Causes

1. Rhabdomyolysis Caused by Electrolyte Disturbances

Rhabdomyolysis may occur due to severe reductions in certain electrolytes, such as potassium or phosphate. These disturbances interfere with normal muscle function and may lead to muscle cell damage. During pregnancy, this condition may be associated with severe vomiting, dehydration, and malnutrition.

2. Infection-Related Rhabdomyolysis

This condition may result from certain viral or bacterial infections, particularly those accompanied by a high fever or an acute inflammatory response that can affect muscle tissue and cause damage.

3. Rhabdomyolysis Caused by Excessive Physical Exertion or Muscle Injury

Rhabdomyolysis may occur when physical exertion exceeds the muscles' capacity, when muscles are subjected to prolonged pressure, or following direct injuries that damage muscle fibers and release their contents into the bloodstream.

4. Drug-Induced or Toxin-Induced Rhabdomyolysis

Certain medications or toxic substances may cause muscle tissue damage, potentially leading to rhabdomyolysis in susceptible individuals. Identifying the cause requires reviewing the patient's medication history, assessing associated risk factors, and performing the necessary medical investigations.

5. Rhabdomyolysis Associated with Genetic or Metabolic Disorders

Certain genetic and metabolic disorders may increase susceptibility to rhabdomyolysis, particularly conditions that affect fat or carbohydrate metabolism within muscles. Symptoms may appear or worsen when triggering factors occur, such as prolonged fasting, physical exertion, or infection.

6. Rhabdomyolysis Associated with Labor and Delivery

In rare cases, rhabdomyolysis may occur during labor or after delivery due to intense muscular exertion associated with prolonged labor, sustained pressure on the muscles, or certain complications related to childbirth.

Second: Classification of Rhabdomyolysis According to Severity

Rhabdomyolysis can be descriptively classified into three main severity levels:

1. Mild rhabdomyolysis: Muscle injury is relatively limited, with no significant complications or only minor abnormalities that can be managed appropriately.

2. Moderate rhabdomyolysis: More pronounced muscle damage occurs, and electrolyte disturbances or abnormalities in kidney function markers may develop, requiring close medical monitoring.

3. Severe rhabdomyolysis: Significant muscle damage occurs and may be associated with serious complications, such as acute kidney injury, severe electrolyte disturbances, or cardiac arrhythmias.

Causes of Rhabdomyolysis During Pregnancy

Rhabdomyolysis is a medical condition characterized by the rapid breakdown of skeletal muscle cells, resulting in the release of their contents, including creatine kinase (CK) and myoglobin, into the bloodstream. Severe cases may lead to serious complications, particularly acute kidney injury and electrolyte imbalances.

This syndrome is rare during pregnancy. It may result from factors associated with physiological changes or pregnancy-related complications, as well as from other causes that are not directly related to pregnancy.

First: Potential Causes of Rhabdomyolysis During Pregnancy

1. Hyperemesis Gravidarum

Severe and persistent vomiting during pregnancy may lead to dehydration, malnutrition, and electrolyte imbalances, particularly low potassium and phosphate levels. These disturbances may impair muscle function and contribute to muscle fiber damage and breakdown.

2. Severe Hypokalemia

Severely low blood potassium levels are a potential cause of rhabdomyolysis during pregnancy. Hypokalemia may result from repeated vomiting or certain kidney disorders that cause potassium loss. These abnormalities interfere with normal muscle function and increase the risk of muscle cell injury.

3. Severe Infections

Certain bacterial or viral infections may cause rhabdomyolysis, particularly when accompanied by a high fever or a systemic inflammatory response. Examples include pyelonephritis and certain severe viral infections that may affect muscle tissue.

4. Prolonged or Physically Demanding Labor

In rare cases, rhabdomyolysis may develop due to severe muscular exertion or prolonged pressure on the muscles during labor, particularly when additional risk factors for muscle tissue damage are present.

5. Medications and Certain Substances

Rhabdomyolysis may be associated with the use of certain medications or exposure to toxic substances that affect muscle integrity.

Examples include some cholesterol-lowering medications, such as statins, and certain beta-adrenergic agonists, such as ritodrine, which has been used in some cases to suppress uterine contractions. Rare cases of rhabdomyolysis associated with ritodrine use have been reported.

The likelihood of a causal relationship depends on the medication, its dosage, and other contributing factors.

6. Inherited Muscle Diseases and Disorders of Muscle Metabolism

Certain inherited muscle diseases and metabolic disorders that affect energy production or utilization within muscle cells may increase the risk of rhabdomyolysis. These may include some forms of muscular dystrophy and disorders of fat or carbohydrate metabolism.

Symptoms may first appear when triggering factors occur, such as infection, prolonged fasting, or physical exertion.

7. Strenuous Physical Activity or Muscle Injuries

Excessive physical exertion, intense exercise, direct injuries, or prolonged pressure on muscles may damage muscle fibers and release their contents into the bloodstream.

The risk depends on the intensity and duration of the exertion, the muscles' tolerance, and the presence of other risk factors.

8. Other Metabolic, Hormonal, and Renal Disorders

Other conditions may contribute to rhabdomyolysis, including severely low phosphate levels, certain thyroid disorders, and metabolic abnormalities that affect energy production within muscle cells.

Some kidney disorders may also complicate the condition, particularly when accompanied by electrolyte imbalances.

Second: Important Scientific Considerations

• Rhabdomyolysis may result from a combination of factors in the same pregnant woman, such as severe vomiting, dehydration, and hypokalemia.

• Not all the factors mentioned are common causes during pregnancy. Some are rare, and evidence of their association with pregnancy may be based on clinical case reports.

• Diagnosing the condition and identifying its underlying cause require an assessment of symptoms, measurement of creatine kinase levels, evaluation of kidney function and electrolytes, and a review of the patient's medical and medication history.

Symptoms of Rhabdomyolysis During Pregnancy

First: Main Symptoms

1. Muscle Pain

A pregnant woman may experience severe or unusual muscle pain, particularly in the thighs, legs, back, and shoulders. The pain may be accompanied by tenderness when the affected muscles are touched or pressed.

2. Changes in Urine Color

Urine may turn dark brown or become tea-colored or cola-colored due to the presence of myoglobin released during muscle fiber breakdown. However, this symptom does not occur in every affected woman, and its absence does not rule out the condition.

3. Muscle Weakness and Fatigue

The pregnant woman may experience noticeable muscle weakness and severe fatigue, with difficulty walking, climbing stairs, or performing usual daily activities due to muscle tissue damage.

4. Muscle Swelling and Cramping

The affected muscles may become swollen and may be accompanied by pain, stiffness, or muscle cramps. The severity of these symptoms varies according to the extent of muscle tissue damage.

Second: Other Symptoms and Potential Complications

Additional symptoms may occur, particularly in severe cases or when complications develop. These include:

• Nausea and vomiting: These may occur alongside dehydration or metabolic disturbances associated with the condition.

• Fever: This may develop when an infection is the underlying cause of rhabdomyolysis.

• Reduced urine output: This may indicate impaired kidney function or the development of acute kidney injury.

• Heart palpitations or irregular heartbeat: These may result from electrolyte imbalances, particularly elevated potassium levels.

• Dizziness or confusion: These may occur in severe cases due to metabolic disturbances or systemic complications.

• Signs of acute kidney injury: These may include reduced urine output and elevated blood creatinine levels.

It is important to note that the classic symptoms of rhabdomyolysis, such as muscle pain, weakness, and changes in urine color, may not all occur in the same patient.

What Are the Major Risks of Rhabdomyolysis During Pregnancy?

First: Risks to the Mother

1. Acute Kidney Injury

The release of myoglobin resulting from muscle fiber breakdown can damage the kidneys, particularly in the presence of dehydration or reduced blood volume. In severe cases, acute kidney injury may require temporary dialysis.

2. Electrolyte Imbalances

Abnormal levels of salts and minerals in the blood may occur, particularly elevated potassium, decreased calcium, or disturbances in phosphate levels. These changes can lead to serious complications if not treated promptly.

3. Cardiac Complications

Elevated potassium or other electrolyte disturbances may cause cardiac arrhythmias. In severe cases, these complications may progress to cardiac arrest.

4. Blood Coagulation Disorders

Abnormalities in blood clotting, including disseminated intravascular coagulation (DIC), may occur in severe and complicated cases, particularly when additional factors such as sepsis or shock are present.

5. Compartment Syndrome

Severe swelling within a closed muscle compartment can increase pressure on blood vessels and nerves, threatening the viability of muscle tissue. This condition requires urgent assessment and treatment to prevent permanent damage.

Second: Risks to the Fetus

The fetus may be indirectly affected by deterioration in the mother's health or the development of serious complications. Potential outcomes include:

• Preterm birth: Some severe cases may require early delivery, depending on the clinical condition of the mother and fetus.

• Low birth weight: This may be associated with preterm birth or other medical conditions complicating the pregnancy.

• Fetal compromise: This may occur as a result of deterioration in the mother's general condition, impaired organ function, or hemodynamic instability.

• Fetal loss: The risk may increase in severe cases accompanied by serious complications; however, this possibility cannot be generalized to all cases of rhabdomyolysis.

It is important to note that scientific evidence regarding pregnancy outcomes in rhabdomyolysis is limited because the condition is rare. Some adverse outcomes may also be related to associated complications or the underlying diseases that caused the condition, rather than rhabdomyolysis alone.

Third: Factors That Increase the Severity of the Condition

The severity of rhabdomyolysis during pregnancy is influenced by several factors, including:

1. Delayed diagnosis and treatment: This may increase the likelihood of progressive muscle injury and renal or cardiac complications.

2. Severe dehydration and persistent vomiting: These may reduce blood volume and disrupt electrolyte balance, increasing the risk of kidney injury.

3. Severe electrolyte abnormalities: Particularly high or markedly low potassium levels, as well as significant phosphate depletion.

4. Markedly elevated creatine kinase (CK) levels: These indicate muscle injury, but the assessment of severity also depends on kidney function, electrolyte levels, and the overall clinical condition.

5. Signs of kidney injury or cardiac abnormalities: These indicate the presence of complications requiring urgent medical intervention.

Medical Treatment of Rhabdomyolysis During Pregnancy

First: Medications and Treatments Used

1. Intravenous Fluids

Intravenous fluids are a cornerstone of rhabdomyolysis treatment. They help restore blood volume, improve renal perfusion, and reduce the risk of acute kidney injury.

Fluids that may be used include:

• 0.9% sodium chloride solution (normal saline): Used to replace fluids and improve blood volume and circulation.

• Lactated Ringer's solution: May also be used for fluid replacement, depending on the clinical condition and laboratory results.

The type, volume, and rate of fluid administration are determined according to the pregnant patient's condition, kidney function, urine output, and electrolyte levels. Careful monitoring of fluid balance is essential to prevent fluid overload, particularly in patients with impaired kidney function.

2. Treatment of Electrolyte Disturbances

Rhabdomyolysis may cause serious abnormalities in potassium, calcium, and phosphate levels. Treatment therefore requires correction of these abnormalities according to laboratory findings.

A. Treatment of Hyperkalemia

Elevated potassium is a serious complication because it can affect the heart's electrical activity. Depending on the severity of the condition, treatment may include:

• Intravenous calcium gluconate or calcium chloride: Used to protect the heart when serious cardiac changes are present or when other clinical indications warrant it. Calcium does not lower the potassium level itself.

• Insulin with glucose: Helps shift potassium from the bloodstream into cells, temporarily lowering the blood potassium level.

• Additional potassium-lowering treatments: Selected according to the patient's condition, while addressing the underlying cause and monitoring kidney function.

These interventions require repeated monitoring of the electrocardiogram (ECG), potassium levels, and blood glucose.

B. Treatment of Hypokalemia

If laboratory tests confirm a low potassium level, the physician may prescribe oral or intravenous potassium supplements, depending on the severity of the deficiency, associated symptoms, and kidney function. Replacement must be administered cautiously to avoid excessive elevation of potassium.

C. Treatment of Calcium and Phosphate Disturbances

Blood calcium levels may decrease during the early phase of rhabdomyolysis. Therefore, hypocalcemia is not automatically treated in every case; treatment is determined according to symptoms and laboratory findings. Calcium is administered when clear clinical indications exist, such as symptomatic hypocalcemia associated with serious manifestations.

Severe phosphate deficiency may require replacement under medical supervision, with consideration of kidney function and monitoring of calcium and phosphate levels.

3. Treatment of the Underlying Cause of Rhabdomyolysis

Treatment is not limited to correcting muscle injury and electrolyte disturbances. The underlying cause must also be addressed, including:

• Bacterial infections: Appropriate antibiotics are used when an infection is confirmed or strongly suspected clinically. Medications suitable for pregnancy and the patient's kidney function should be selected.

• Severe pregnancy-related vomiting and dehydration: Dehydration is treated with appropriate fluids. Antiemetics suitable for pregnancy may also be used, along with correction of nutritional deficiencies and electrolyte disturbances.

• Medications that cause muscle damage: The physician assesses whether the suspected medication should be discontinued or replaced, taking into account its importance and the pregnant patient's medical condition.

• Metabolic or hormonal disorders: These are treated according to the nature and severity of the disorder, while taking the requirements of pregnancy into consideration.

4. Treatment of Severe Complications

Some cases may require additional interventions, including:

Dialysis: This may be necessary when acute kidney injury is accompanied by complications that do not respond to medical treatment, such as persistent hyperkalemia, severe metabolic acidosis, or fluid overload associated with complications. Dialysis is not indicated solely because creatine kinase (CK) levels are elevated.

Treatment of compartment syndrome: If muscle swelling causes a dangerously high pressure within a muscle compartment, urgent surgical intervention may be required to relieve the pressure and protect the tissues.

Second: Are Sodium Bicarbonate or Mannitol Used?

1. Sodium Bicarbonate

Sodium bicarbonate is not routinely recommended to prevent rhabdomyolysis-related kidney injury, as there is insufficient evidence that it is superior to appropriate intravenous hydration alone for this purpose. A physician may decide to use it in specific circumstances, such as severe metabolic acidosis, based on clinical assessment.

2. Mannitol

Mannitol is not routinely recommended to prevent kidney injury in rhabdomyolysis because evidence supporting its benefit is insufficient and it may cause complications, particularly in the presence of renal impairment or fluid-balance disturbances.

Third: Tests Required to Monitor Treatment

Monitoring a pregnant patient with rhabdomyolysis requires repeated tests to assess the response to treatment and detect complications early. These include:

1. Creatine kinase (CK): To monitor the progression of muscle injury and changes in enzyme levels.

2. Kidney function tests: Measurement of creatinine and urea, along with monitoring changes in kidney function.

3. Blood electrolytes: Measurement of potassium, calcium, phosphate, and sodium, with repeat testing according to the severity of the condition.

4. Urine output and fluid balance: To monitor urine production and detect fluid retention or depletion.

5. Electrocardiogram (ECG): When potassium abnormalities are present or cardiac involvement is suspected.

6. Fetal monitoring: According to gestational age and the severity of the mother's condition, using appropriate assessment methods, such as fetal heart rate monitoring when indicated.

Surgical Treatment of Rhabdomyolysis During Pregnancy

First: Potential Surgical Interventions and Procedures

1. Surgical Fasciotomy

This procedure is performed when acute compartment syndrome develops. In this condition, pressure within a muscle compartment increases, potentially impairing blood flow and causing damage to muscles and nerves.

The general steps of the procedure include:

1. Clinical assessment of the affected limb and measurement of compartment pressure when necessary.

2. Selection of appropriate anesthesia and preparation of the affected limb.

3. Making a surgical incision through the skin and muscle fascia to relieve the pressure.

4. Assessing muscle viability and ensuring that the affected compartment has been adequately decompressed.

5. Temporarily leaving the wound open when necessary, followed by reassessment and later closure or skin grafting if required.

Urgent intervention is essential when acute compartment syndrome requiring decompression is diagnosed. The decision must be made by a specialized surgical team, taking the condition of both the mother and fetus into account, because delays may result in permanent muscle and nerve damage.

2. Dialysis

Dialysis is not a surgical procedure for treating muscle damage. Rather, it is a treatment used when acute kidney failure is accompanied by complications that warrant renal replacement therapy, such as:

• Severe hyperkalemia that does not respond to treatment.

• Severe and persistent metabolic acidosis.

• Fluid overload that threatens cardiac or respiratory function.

• Other complications of kidney failure requiring renal replacement therapy.

The general steps of the procedure include:

1. Assessing kidney function, electrolyte levels, and fluid status.

2. Establishing appropriate vascular access, usually through a dedicated venous catheter.

3. Connecting the patient to the dialysis machine using the selected method.

4. Filtering the blood and correcting fluid and electrolyte disturbances under the supervision of the specialist team.

5. Monitoring the mother's response to treatment and assessing the fetus according to gestational age and the severity of the condition.

Dialysis is not initiated solely because creatine kinase (CK) levels are elevated. It is based on clinical indications of kidney failure and its complications.

Second: Does Rhabdomyolysis Require a Cesarean Delivery?

Rhabdomyolysis alone is not an automatic indication for cesarean delivery. The timing and mode of delivery are determined according to:

• The stability of the mother's medical condition and the extent of kidney or cardiac involvement.

• The fetal condition and the results of fetal monitoring.

• Gestational age.

• The presence of obstetric indications requiring urgent delivery.

The decision is made collaboratively by obstetricians, anesthesiologists, and kidney specialists, according to the clinical circumstances.

Third: Follow-Up After Intervention

Medical follow-up includes:

• Repeated measurement of CK levels and monitoring of kidney function and electrolytes.

• Monitoring urine output and fluid balance.

• Assessing wound healing and muscle function after fasciotomy.

• Monitoring vital signs and performing ECG monitoring when indicated.

• Assessing fetal well-being according to gestational age and the mother's clinical stability.