Opisthotonus is defined as a dramatic abnormal posture due to spastic contraction of the extensor muscles of the neck, trunk, and lower extremities that produces a severe backward arching from neck to heel. In most cases, the trunk is elevated off the ground by a few inches. It is usually sudden in onset and can be sustained or repetitive. It can be considered a variant of decerebrate posturing involving hyperextension of the neck, back, and limbs. Sometimes it is referred to as arc de cercle. When the anterior abdominal muscle involvement is greater, emprosthotonus posture occurs where the body is arched anteriorly.
Several entities can lead to generalized stiffness and spasms. However, the typical opisthotonus, risus sardonicus, and trismus are found in tetanus. Opisthotonos occurs in a wide variety of disorders. It can manifest at any stage of the disorder and, on some occasions, may be the only symptom that will point to identify the correct disease.
Developmental and Metabolic
Cerebral palsy, Krabbe disease, hyperbilirubinemia, and kernicterus, Gaucher disease, adenylosuccinate lyase deficiency, infant alcohol withdrawal syndrome, which is more commonly seen in neonates.
Increased Intracranial Pressure
Intracranial hemorrhage, subarachnoid hemorrhage, hydrocephalus, or a space-occupying lesion
This includes neurodegeneration with brain iron accumulation, Wilson disease, cerebral palsy, and Parkinson disease. It has been described in neurometabolic disorders like maple syrup urine disease, glutaric aciduria, Lesch Nehan syndrome, dopa-responsive dystonias.
Opisthotonus is relatively rare. It is a sign that may be present in a wide variety of disorders. It can affect infants (e.g.neonatal tetanus), children, or adults. There is no gender predilection. It is indeed difficult to diagnose in the younger age group. As opisthotonus is not a disorder nor a disease, the incidence and prevalence are not reported.
The typical posture occurs due to the simultaneous mass contraction of agonist and antagonist muscle groups along with increased tone. There is an imbalance between facilitatory and inhibitory neurologic pathways innervating the muscle groups involved. It is possible that the secretion of inhibitory neurotransmitters, such as glycine and gamma-aminobutyric acid, plays a role. Consequently, there is uncontrolled activity of alfa and gamma motor neurons. The segmental reflex loop keeps active, perpetuating a sustained state of muscle contraction. In tetanus, the toxin blocks the presynaptic spinal inhibitory neurons.
The principal postural abnormality is the arching of the back and extension of extremities. It occurs due to spastic, sustained dystonic contraction of spinal muscles leading to dorsal extension movement of the spine. There is a rigid backward extension of the head, neck, and trunk. This typical posture occurs due to the simultaneous mass contraction of agonist and antagonist muscle groups along with increased tone.
Symptoms associated with opisthotonos are representative of the causative disease. Fever may be present in tetanus and meningitis, while hydrophobia may be seen in rabies. Tachycardia, pupillary abnormalities, hyperhidrosis, cardiac arrhythmias, fluctuating blood pressure, respiratory abnormalities due to autonomic or muscular pathology can occur. Altered consciousness, vomiting, seizures are not uncommon. Patients may complain of pain or discomfort due to spastic contraction of muscles. Patients may develop fatigue due to multiple factors like poor oral intake, increased muscle activity, fever, and vomiting. Opisthotonus is difficult to be diagnosed in children as they are crying, restless, or may develop intermittent contraction of muscle groups.
Opisthotonus frequently poses a diagnostic dilemma. The patients may exhibit non-specific signs and symptoms. The cause of opisthotonus may be due to a myriad of diagnoses including infectious, metabolic, developmental, degenerative, neurologic, environmental etiologies. While the physical exam may reveal that the patient has generalized stiffness and spasms, the cause is difficult to know without proper imaging studies and metabolic and hematological studies. Due to wide variations in presentation, diagnosis may be delayed if patients are not specifically screened for specific diseases.
It is extremely important to make an early and correct diagnosis of the etiology producing opisthotonus. Delay in the diagnosis can produce devastating outcomes and even death. It is important to attempt the prevention of causative agents. Collaboration in care is an integral component of delivering efficient and effective health care. While the responsibility for screening rests mainly among primary care providers, most do not consistently assess metabolic problems due to various barriers such as lack of time and more pressing health issues.
Tests to confirm the underlying cause, complications, and for monitoring the disease activity are performed. They include complete blood counts, metabolic profile, renal and hepatic functions. Brain magnetic resonance imaging and/or computed tomography scan is performed to confirm the presence of lesions causing raised intracranial pressure. Lumbar puncture can be performed after a normal neuroimaging study and is likely to reveal a raised opening pressure. The fluid obtained undergoes relevant tests like glucose, protein, cell count to rule out infections.
Treatment includes the management of the underlying pathology. Depending on the underlying cause, appropriate antimicrobial agents and tetanus immune globulins are administered if the disease is suspected or confirmed. Deep brain stimulation for dystonic opisthotonos associated with Parkinson’s disease has produced variable outcomes. Enzyme replacement therapy is used for Gaucher’s disease.
Supportive measures include maintenance of fluid and electrolyte balance and ventilatory support, nutritional support, either parenteral or enteral. Avoidance of triggers like noise in tetanus or the sound of water in rabies reduces precipitation of the spasms. A dark, soundproof room is preferred. Oral administration of medication such as benzodiazepines and baclofen can be administered to improve the spasms. Intrathecal baclofen can reduce spasticity/dystonia. Analgesics are given to reduce the pain. Anticholinergics agents are administered intramuscularly or intravenously.
It is important to educate patients, caretakers, and colleagues about opisthotonus and its many consequences. Successful interventions with early identification and treatment may help to slow progression and improve the quality of life. Older adults should pay attention to their ability to prevent some of the associated causes, especially tetanus. It is important to maintain adequate tetanus prophylaxis on all older patients (age 60 and beyond) as they forget about preventive immunization.
Opisthotonus can be life-threatening if left untreated. When the primary etiology is controlled or eliminated, patients will no longer present opisthotonus. The prognosis of the patient will depend on the disorder causing it. Intrathecal baclofen to reduce spasticity/dystonia in children and deep brain stimulation for dystonic opisthotonos in Parkinson disease produce good results to improve the quality of life.
Ophisthotonus can be prevented by preventing the underlying causes. Tetanus vaccination in pregnancy has effectively reduced the incidence of neonatal tetanus. The children are to be vaccinated according to the prevalent guidelines.
Meningitis can be prevented by improving immunity and vaccinations, which can protect from some bacterial infections.
Maintaining optimal blood pressure and blood glucose is essential.
General measures include hand hygiene, maintenance of clean surfaces and surroundings, isolation of cases, and the rapid diagnosis of an underlying ailment.
An interprofessional team that provides a holistic and integrated approach to care for the patient can help achieve the best possible outcomes. The primary outcome is to improve patients' comfort and nursing care. Nurses are a vital member of the interprofessional group as they will monitor the patient's vital signs and assist with the education of the patient and family. For the management of pain, wound infection, muscle contraction, the pharmacist will ensure that the patient is on the right analgesics, antispasmodic, anticholinergic, and appropriate antibiotics. The radiologist also plays a vital role in determining the cause. Without providing a proper history, the radiologist may not be sure what to look for or what additional radiologic exams may be needed. When the patient is to be discharged home, consultation should be made with a social worker and community nurses who can monitor the patient and make referrals as needed. Prompt referrals are warranted to improve outcomes. Physical therapists must be consulted for early ambulation to prevent contractures. Rehabilitation is essential in the management of patients who developed opisthotonus. Unrehabilitated patients may develop ulcers, chronic spasticity, contractures, and even scoliotic deformities.
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