Approach

Prevention of tetanus is always preferable to management of the clinical tetanus syndrome. See Primary prevention.

The management of clean and tetanus-prone wounds should take into account the patient's immunization status. Immunosuppressed patients may not be adequately protected and additional boosting and/or tetanus immune globulin (TIG) may be required; in the US, immunosuppressed patients should be managed as if they were incompletely immunized.[3][4][38]

The principles of management for the clinical tetanus syndrome include supportive care, wound debridement, antimicrobials, passive and active immunization, control of muscle spasms, and management of autonomic dysfunction.[1][45][46]​​

Management of clean and minor wounds and tetanus-prone wounds

Tetanus toxoid-containing vaccine and/or TIG may be used depending on the patient’s immunization history and risk assessment of the wound.

Wounds or burns that are considered to be tetanus prone include the following:[3][4]

  • Requiring surgical management but delay in intervention is more than 6 hours

  • Puncture-type injury or a significant degree of devitalized tissue (especially in contact with soil or manure)

  • Certain animal bites and scratches

  • Foreign body-containing wounds

  • Open fractures

  • Concomitant systemic sepsis.

Tetanus toxoid is only available in combination with other antigens such as diphtheria and pertussis. The following vaccines are recommended for active vaccination in patients with tetanus-prone wounds: diphtheria/tetanus/acellular pertussis vaccine (DTaP); tetanus/diphtheria vaccine (Td for children ≥7 years of age and adults; or DT for children up to 7 years of age); and tetanus/low-dose diphtheria/acellular pertussis vaccine (Tdap). DTaP is recommended for children aged <7 years. DT is used when the pertussis vaccine component is contraindicated. Tdap can be given if the person is 11 years of age or older and has not yet received Tdap.[3][29][38]

In the US, patients with clean, minor wounds who have only had up to 2 doses of a tetanus toxoid-containing vaccine or an uncertain vaccination history should be given tetanus toxoid-containing vaccine, while patients who have received ≥3 doses do not require tetanus toxoid-containing vaccine unless they have not received a dose in the last 10 years. Clean or minor wounds do not require human TIG.[3][38]

For all other wounds, patients who have only had up to 2 doses of tetanus toxoid-containing vaccine or an uncertain vaccination history should be given tetanus toxoid-containing vaccine and intramuscular TIG; patients who have received ≥3 doses do not require tetanus toxoid-containing vaccine unless they have not received a dose in the last 5 years. These patients do not require TIG.[3][38]

If a tetanus booster is indicated for wound management during pregnancy, Tdap should be administered instead of Td if the woman has not received Tdap previously.[35]

[Figure caption and citation for the preceding image starts]: US recommendations for tetanus wound management. DTaP = diphtheria and tetanus toxoids and acellular pertussis vaccine; Tdap = tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis; Td = tetanus and diphtheria toxoids; TIG = tetanus immune globulin. *DTaP is recommended for children aged <7 years. Tdap is preferred to Td for persons aged ≥11 years who have not previously received Tdap. Persons aged ≥7 years who are not fully immunized against pertussis, tetanus or diphtheria should receive one dose of Tdap for wound management and as part of the catch-up series. **Immunosuppressed patients should be managed as if they were incompletely immunized (i.e., those with contaminated wounds should also receive TIG, regardless of their history of tetanus immunization)Liang JL et al. Prevention of pertussis, tetanus, and diphtheria with vaccines in the United States: Recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR Recomm Rep. 2018;67:1-44. [Citation ends].com.bmj.content.model.Caption@9943e9b

When indicated, intramuscular TIG is the treatment of choice for prevention of tetanus and should be used if it is available.[1][4][38]​ Tetanus antitoxin (equine) is cheaper to produce and is more widely available in the developing world (it may not be available or may be difficult to access in some countries), but has a higher incidence of anaphylaxis (20% of cases) and a much shorter half-life (2 days).[19] Tetanus antitoxin (human) may also be available in some countries. If TIG cannot be sourced, guidelines in the UK recommend that the subcutaneous or intramuscular formulation of human normal immune globulin may be given intramuscularly as an alternative.[4][39]​ This strategy could also be considered in similar circumstances outside the UK.

Management of clinical tetanus: supportive care

  • Patients should be stabilized and their airway secured to ensure adequate ventilation (which can be compromised by the muscle spasms) and to prevent aspiration of gastric contents into the lungs. Patients should be transferred to an intensive care unit. External stimulation, which can precipitate muscle spasms, should be minimized.

Airway management

  • There is a high risk of aspiration of gastric contents into the lungs resulting from reduced ability to cough due to muscle rigidity and sedation, pharyngeal spasms, dysphagia, gastric stasis, and increased intra-abdominal pressure during spasms. In severe tetanus, spasms may increase rapidly in frequency and duration; establishing a secure airway early is paramount before laryngeal obstruction and/or aspiration occurs.

  • Prolonged mechanical ventilation is often required, sometimes for weeks, and early percutaneous tracheostomy is appropriate.[49] Patients with tetanus have increased salivation and bronchial secretions; mouth care, regular tracheal suction, and chest physical therapy are crucial to prevent secondary pulmonary infection and atelectasis. Boluses of sedation and neuromuscular blocking agents are required for these procedures to avoid stimulation.

Nutritional support

  • Energy demands in tetanus can be extremely high due to repeated spasms and sympathetic overdrive. Nutritional support should be initiated early, ideally by enteral feeding to maintain gastrointestinal integrity.[19]

  • Percutaneous endoscopic gastrostomy is preferred to avoid the stimulation and reflux associated with nasogastric tubes.

Stress ulceration

  • A proton-pump inhibitor may be prescribed to reduce stress ulceration.

Venous thromboembolism prophylaxis

  • Compression stockings, subcutaneous heparin, and calf pumps are indicated.

Physical therapy

  • Limb physical therapy should be started as soon as spasms have abated.

Decubitus ulcer prevention

  • Management should include prevention of decubitus ulcers, as patients can be bed bound for weeks.

Management of clinical tetanus: wound debridement

Wound debridement removes spores and necrotic tissue, eradicating the anaerobic conditions that facilitate clostridial growth. Antibiotic penetration into devitalized tissue is likely to be poor, emphasizing the importance of adequate wound debridement.[50]

Management of clinical tetanus: antibiotic therapy

Antibiotics halt bacterial replication and thereby reduce the production of new toxins. Metronidazole has superseded penicillin G as the antimicrobial of choice for the treatment of tetanus. Penicillin G has traditionally been used for this purpose.[19] However, penicillin G is structurally similar to gamma-aminobutyric acid (GABA) and competitively antagonizes this neurotransmitter, an action that could potentiate the effects of tetanus toxin in inhibiting release of GABA into the synaptic cleft and enhancing central nervous system excitability.[19]

Evidence suggests that, compared with penicillin G, metronidazole was associated with reduced mortality.[51] Other evidence indicates no difference in mortality, but that metronidazole is associated with a lower requirement for muscle relaxants and sedatives.[52] This difference may be attributable to the GABA antagonist effect of penicillin G. Alternative antibiotics include clindamycin, tetracycline, and vancomycin.[1]

Management of clinical tetanus: use of human TIG

Intramuscular TIG should be administered to patients with clinical tetanus.[1][38] It should be administered as soon as possible after the injury.[1] Passive immunization neutralizes unbound toxin, reducing the duration and severity of tetanus.

Intramuscular TIG (half-life 24.5 to 31.5 days) is the treatment of choice.[1][38]​ If intramuscular TIG is unavailable, intravenous human normal immune globulin may be used.[38] Tetanus antitoxin (equine) is more widely available in the developing world (it may not be available or may be difficult to access in some countries), but has a higher incidence of anaphylaxis (20% of cases) and a much shorter half-life (2 days).[19]​ Tetanus antitoxin (human) may also be available in some countries.

Management of clinical tetanus: active immunization with tetanus vaccine

Patients with clinical tetanus should receive immunization with tetanus toxoid-containing vaccine to stimulate long-term humoral and cellular immunity. In addition, it is thought that tetanus toxoid saturates ganglioside receptors, blocking the binding of wild-type toxin.[19] Toxoid should be injected at a different site from immune globulin so that it is not "neutralized" by the passive immunization.

Management of clinical tetanus: control of muscle spasms

Muscle spasms are extremely painful and potentially life-threatening if they cause airway compromise or respiratory failure. Benzodiazepines have been the mainstay of controlling muscle spasms, and in addition have anticonvulsant, sedative, and anxiolytic effects. They block an endogenous inhibitor at the GABAA receptor. Diazepam is often used.[1] High doses may necessitate ventilatory assistance and have been associated with lactic acidosis due to the excipient propylene glycol.[53] Diazepam metabolites are active with long half-lives (desmethyldiazepam has a half-life of greater than 100 hours), and for this reason midazolam infusions may be preferred in adults.[54][55] In children, diazepam may cause significant respiratory depression; therefore, midazolam or lorazepam may be preferred.

There is some evidence that diazepam is more effective in treating tetanus than alternative sedatives such as phenothiazines and barbiturates.[56] However, the studies concerned were limited by their small size, lack of data on drug safety, and other methodologic drawbacks. Large multicenter randomized controlled trials are needed to establish whether diazepam is superior to phenobarbital and chlorpromazine.

Some patients require paralysis with nondepolarizing neuromuscular blocking agents in addition to sedation. Traditionally pancuronium was used, although this was known to potentially aggravate autonomic instability.[57] Vecuronium and rocuronium are associated with less autonomic disturbance, and are preferred.

Baclofen stimulates postsynaptic GABAB receptors and has been found to improve muscle spasms when given by intrathecal bolus or infusion, but only in a few small studies.[58][59][60][61] In a retrospective outcome study from a single centre in Portugal during 1998 to 2003, intrathecal baclofen was given as an initial bolus, followed by a continuous infusion.[62] This controlled spasms and rigidity in 21 of 22 patients with grade 3 tetanus. Most patients required therapy for at least 3 weeks (range 8 to 30 days). One patient developed meningitis secondary to infection of the intrathecal catheter. Intrathecal baclofen has a narrow therapeutic range and considerable inter-individual pharmacodynamic variability.[58] Treatment with intrathecal baclofen should only be considered under specialist guidance and administration.

Management of clinical tetanus: autonomic dysfunction

Autonomic dysfunction is extremely difficult to control. It arises in patients with severe disease, usually in the second week of illness.

Magnesium sulfate is a presynaptic neuromuscular blocker, blocks catecholamine release from nerves and the adrenal medulla, and reduces receptor responsiveness to catecholamines. It is also an anticonvulsant and a calcium antagonist in the myocardium.[19] Electromyogram studies have suggested that magnesium tends to spare the respiratory muscles, although at high doses ventilation may be depressed, mandating ventilatory support.[54][63]​ Magnesium sulfate has previously been reported to be both an effective adjunct in controlling autonomic disturbance in heavily sedated patients with severe tetanus​​ and successful in relieving spasms in nonventilated patients.[64][65][66] One randomized controlled trial found that magnesium sulfate significantly reduced the requirement for other drugs (e.g., midazolam) used for the control of muscle spasms and showed that patients are less likely to need verapamil for cardiovascular instability, when compared with placebo.[67] There was no difference in the need for mechanical ventilation.[67] An earlier, small prospective observational study suggested that magnesium sulfate reduces not only the use of neuromuscular blocking agents to control severe spasms but also the requirement for mechanical ventilation when compared with historical controls.[68] Conflicting results may reflect differences in study design and magnesium administration.[67] A loading dose of 5 g of magnesium sulfate given intravenously over 20 minutes has been advocated, followed by magnesium infusion, the rate of which is titrated to the control of spasms and rigidity.[54] The aim is not to completely abolish muscle rigidity, but to reduce it to a level that is acceptable to the patient and allows swallowing of saliva, mouth care, and limb physical therapy. Doses as high as 4 to 5 g/hour may be necessary, with monitoring for respiratory depression. One meta-analysis of 3 controlled trials found no reduction in mortality for patients treated with magnesium sulfate compared with placebo or diazepam therapy. Conclusions about the effects of magnesium on duration of intensive care stay, duration of hospital stay, and requirement for ventilatory support could not be drawn due to large methodological differences between the studies included.[69]

Sedation helps to reduce autonomic instability, and both benzodiazepines and morphine sulfate are useful in this regard. Morphine sulfate reduces sympathetic tone in the heart and the vascular system, improving cardiovascular stability without compromising cardiac performance.[1][70]

Beta-blockade may be required in further management of the autonomic instability. Choice and dosing of a beta-blocker should be decided in consultation with a specialist. Pure beta-blockade, with propranolol, has been associated with sudden death.[71]

Atropine, clonidine, and epidural/spinal bupivacaine have been reported to improve autonomic disturbance in either individual patients or very small series. Larger trials are needed to adequately assess outcome measures for these treatments.[72][73][74][75][76][77]

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