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Muscle tetanus is a serious condition that affects the central nervous system and can be fatal if not treated promptly. It is caused by the toxin of the tetanus bacterium, which enters the body through open wounds, usually contaminated with dirt, soil, manure, or rust. While it is unclear how often muscle tetanus occurs, its symptoms can develop anywhere from 4 to 21 days after infection, with an average onset time of 7 to 10 days. The first signs of tetanus typically include stiffness and mild spasms in the jaw muscles, which can then spread to other parts of the body, causing severe pain and potentially interfering with vital functions such as breathing and swallowing. Given the potential severity of muscle tetanus, immediate medical attention and hospital treatment are crucial, and vaccination is strongly recommended to prevent the disease.
| Characteristics | Values |
|---|---|
| Cause | The toxin of the tetanus bacterium |
| How it enters the body | Through an open wound |
| Bacteria sources | Soil, dust, manure, animal feces, rusty metal |
| Symptoms | Muscle stiffness, spasms, fast pulse, fever, sweating, painful muscle contractions, trouble swallowing, respiratory failure, bone fractures, muscle tears |
| Early symptoms | Trismus and dysphagia |
| Treatment | Hospital treatment, medicines, antitoxin injections, botulinum toxin, IVIG, tetanus vaccine |
| Prevention | DTaP shot (combination vaccine for diphtheria, tetanus, and pertussis) |
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What You'll Learn
Muscle stiffness and spasms
Muscle spasms, or cramps, can also occur in the general population and are normal and quite common. They can affect anyone at any time and can occur in any area of the body, including the back, arms, legs, neck, chest, abdomen, and rib cage. Muscle spasms are involuntary and unpredictable contractions and tightening of the muscles that can be painful. While muscle spasms are usually not serious, in some cases, they can indicate an underlying neurological condition.
Muscle rigidity and spasms are also symptoms of tetanus, caused by the tetanus toxin produced by Clostridium tetani bacteria. The toxin interferes with the release of inhibitory neurotransmitters, leading to disinhibition of lower motor neurons. This results in muscle spasms and rigidity, which can manifest as trismus/lockjaw, dysphagia, opistotonus, or spasms of respiratory, laryngeal, and abdominal muscles, potentially causing respiratory failure. Treatment of muscle rigidity and spasms in tetanus is crucial, as this can interfere with respiration and is a likely cause of death.
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Treatment with botulinum toxin
Muscle tetanus is a rare but life-threatening disease caused by the tetanus toxin, which is produced by Clostridium tetani. The toxin interferes with the release of inhibitory neurotransmitters, leading to disinhibition of lower motor neurons and subsequent muscle rigidity and spasms. Respiratory failure is a common complication that can be fatal.
Botulinum toxin has been proposed as a treatment for tetanus-induced rigidity and spasms due to its similarity to the tetanus toxin. While the tetanus toxin acts on the spinal cord and brainstem, resulting in spastic paralysis, botulinum toxin acts at the periphery, inhibiting acetylcholine release at the neuromuscular junction and inducing flaccid paralysis. This mechanism can help reduce muscle activity and alleviate symptoms of tetanus.
Botulinum toxin injections have been successfully used to manage trismus (lockjaw) in cephalic tetanus. Injections into the masseter and temporalis muscles can help reduce the risk of pulmonary aspiration, involuntary tongue biting, anorexia, and dental caries associated with trismus. It is important to initiate treatment early in the course of tetanus to achieve these benefits.
In addition to trismus, botulinum toxin injections can be considered for treating dysphagia (difficulty swallowing) in the early stages of tetanus. This can reduce the risk of aspiration and pneumonia, improve dental care, and potentially enable food intake. However, injections into the cricopharyngeal muscles to alleviate dysphagia require electromyographic guidance due to their proximity to the larynx.
Botulinum toxin can also be injected into specific neck muscles, such as the trapezius, splenius capitis, levator scapulae, and sternocleidomastoid muscles, to alleviate painful neck rigidity. Caution must be exercised to avoid neighboring vital structures, such as the carotid artery, and to prevent the spread of botulinum toxin to the larynx.
While botulinum toxin shows promise in treating tetanus-induced rigidity and spasms, there is limited experience with its use in this context. The slow onset of action and gradual increase in effect over one to three weeks require simultaneous treatment with other muscle-relaxing drugs. The possibility of overdosing and the protracted effect of botulinum toxin emphasize the importance of closely monitoring patients. Additionally, the cost of treatment, especially in generalized tetanus requiring large doses, may be a significant obstacle.
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Trismus and dysphagia
Muscle tetanus is a rare but life-threatening disease in developed countries. It is caused by the Clostridium tetani infection, which is commonly found in animal faeces and soil. The early symptoms of tetanus include trismus or lockjaw, followed by dysphagia or difficulty in swallowing. Trismus is characterised by the contraction of the masseter muscles, resulting in the inability to open the mouth. This interferes with eating and oral hygiene, which can have serious implications for dental health.
Trismus is often the first symptom of tetanus, occurring in 50-75% of cases. It is a challenging diagnosis as it is a common symptom in general clinical practice and can be caused by trauma, local infection, psychogenous muscular tension, or temporomandibular joint disease. However, when accompanied by dysphagia, it can indicate tetanus. Dysphagia is a difficulty in swallowing that can lead to aspiration and pneumonia, further endangering the patient's health.
The simultaneous occurrence of acute trismus and dysphagia, along with rapid progression and facial muscle constriction, are strong indicators of tetanus. This is because tetanus toxin blocks the release of inhibitory neurotransmitters, leading to disinhibition of lower motor neurons and resulting in muscle rigidity and spasms. The toxin specifically affects the muscles in the face, neck, shoulders, and back, causing distorted facial expressions and, in some cases, backward arching of the body.
The early diagnosis of tetanus is critical as it can quickly become fatal if left untreated. The spatula test is a simple diagnostic tool with a sensitivity of 94% and specificity of 100%. Treatment for tetanus includes botulinum toxin injections into the masseter and temporalis muscles, which can effectively reduce tetanus symptoms. In addition, vaccination is included in the treatment to prevent future occurrences.
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Vaccination and prevention
Vaccination is the best way to prevent tetanus, a serious and sometimes deadly disease. The CDC and WHO recommend that everyone of all ages gets vaccinated against tetanus. The vaccine is typically given in childhood and adolescence, with booster shots recommended every 10 years thereafter. In the case of deep cuts or wounds, an additional shot may be necessary.
The tetanus vaccine contains deactivated bacteria that cause tetanus, stimulating the body's immune response without causing the disease. It is typically administered in three initial doses, followed by three booster shots. The primary series should begin as early as 6 weeks of age, with subsequent doses given at least 4 weeks apart. The booster shots are ideally given during the second year of life (12-23 months), at 4-7 years of age, and at 9-15 years of age, with at least 4 years between each booster.
For pregnant women, it is recommended to receive a tetanus shot during the third trimester, preferably between 27 and 36 weeks, to protect both the mother and the baby. Newborn babies are particularly vulnerable to tetanus, and immunization during pregnancy can help prevent neonatal tetanus, which is a significant public health problem in low-income countries with low immunization coverage and unclean birth practices.
While most people who receive the tetanus vaccine do not experience serious problems, mild side effects may occur and typically resolve within a few days. More serious reactions are possible but rare. The benefits of vaccination far outweigh the risks, as tetanus is an uncommon but severe disease that requires immediate hospital treatment.
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Early symptoms and diagnosis
Early symptoms of tetanus, also known as lockjaw, include mild spasms in the jaw muscles, which then spread to the rest of the body. The jaw muscles may tighten, making it difficult to open the mouth. This can be followed by stiffness of the neck, difficulty in swallowing, and rigidity of the pectoral and calf muscles. The chest, neck, back, abdominal muscles, and buttocks may also be affected. Back muscle spasms often cause arching, called opisthotonus. Sometimes, the spasms affect muscles used during inhalation and exhalation, which can lead to breathing problems.
Other early symptoms include fever, sweating, elevated blood pressure, and a fast heart rate (tachycardia). Patients may also experience abdominal tenderness and guarding, headache, restlessness, irritability, and feeding difficulties. The incubation period for tetanus is typically between three and 21 days, with an average of about seven days. However, the range varies depending on the type of wound. In general, the farther the injury site is from the central nervous system, the longer the incubation period.
Diagnosis of tetanus is based on the presenting signs and symptoms, as there are currently no blood or laboratory tests available. The spatula test is a clinical test for tetanus that involves touching the posterior pharyngeal wall with a soft-tipped instrument and observing the effect. A positive test result is the involuntary contraction of the jaw (biting down on the spatula), while a negative test result would typically be a gag reflex attempting to expel the foreign object.
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Frequently asked questions
Tetanus is a sometimes fatal disease of the central nervous system. It is caused by the toxin of the tetanus bacterium, which usually enters the body through an open wound.
Symptoms of tetanus include stiffness in the jaw, neck, and facial muscles, as well as muscle spasms, a fast pulse, fever, sweating, and trouble swallowing. In severe cases, tetanus can cause respiratory failure and powerful convulsions that can lead to bone fractures and muscle tears.
On average, symptoms of tetanus appear 7 to 10 days after infection, but they can appear anywhere between 4 to 21 days.
Treatment for tetanus includes medications, antitoxin injections, and in some cases, botulinum toxin injections to reduce muscle symptoms. In severe cases, hospital treatment with intravenous fluids and a ventilator may be required.
The best way to prevent tetanus is by getting vaccinated. The tetanus vaccine is recommended for both children and adults and can protect against the disease if given after an injury.
