30/10/2025
Persistent attacks of opisthotonus before birth might be more serious than you think:
Prof. Mohamed Ali Abdelkader MD.,
Dr. Durr Sabih MD ,Pakistan.
Case presentation:
A full term fetus had repeated attacks of opisthotonus before birth . The attacks occurred on three ultrasounds 12 hours apart . Each attack lasted more than 30 seconds.The patient delivered normally . The baby died shortly after birth .
Definition and prenatal sonographic detection of opisthotonus:
Opisthotonus is defined as a dramatic abnormal posture(hyper extension of the neck ,trunk and lower limbs) due to spastic contraction of the extensor muscles of the neck, trunk, and lower extremities .
This produces a severe backward arching from neck to heel. It is usually sudden in onset and can be sustained or repetitive. (1)
This typical picture has been detected clearly by prenatal ultrasound. Notice the remarkable extension of fetal the neck and trunk. Opisthotonus was not detected in the neonate after birth (See attached clip and figure).
Etiology:
Opisthotonos occurs in a wide variety of disorders.
1)Infections :Meningitis,encephalitis,tetanus.
2)Poisoning: Strychnine,phenothiazines, lignocaine.
3) Developmental and Metabolic
Cerebral palsy, hyperbilirubinemia, kernicterus, Gaucher disease.
4)Cerebral: lnreased intracranual pressure as intracranial hemorrhage, subarachnoid hemorrhage, hydrocephalus, or a space-occupying lesion.
5)Anoxic injury: cardiac arrest,suffocation,or birth asphyxia (2)
Impact of prenatal detection on postnatal management:
Once the prenatal condition is confirmed postnatally,tests to confirm the underlying cause and for monitoring the disease activity are performed.
They include complete blood counts, metabolic profile, renal and hepatic functions. Brain MRI or CT is performed to confirm the presence of lesions causing raised intracranial pressure. A lumbar puncture can be performed .The fluid obtained undergoes relevant tests like glucose, protein, cell count to rule out infections.
Supportive measures include maintenance of fluid and electrolyte balance,ventilatory support, nutritional support, either parenteral or enteral. Avoidance of triggers like noise and light in a dark, soundproof room is preferred. Oral administration of medication such as benzodiazepines and baclofen to improve the spasms. Intrathecal baclofen can reduce spasticity/dystonia.
Analgesics are given to reduce the pain.
The prognosis is dismal with a high rate of neonatal mortality.(3)
Conclusion:
In this article , I meant to throw the light on a severe and life threatening situation that both the sonographer and clinician might be exposed to prenatally, in order not to be surprised by it after birth. It is important to educate both sonographer and clinician about opisthotonus and its consequences. Prenatal identification is important for counseling parents about the severity and bad prognosis of this life threatening condition.
Mohamed Ali Abdelkader .MD
References:
1)Tapajós R. Trismus, opisthotonus and risus sardonicus: who remembers this disease? Rev Bras Ter Intensiva. 2011 Dec;23(4):383-7.
2)Shahade A, De Jesus O. Opisthotonus. 2023 Aug 23. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan–. PMID: 32644596.
3)Ceulemans B, van Rhijn J, Kenis S, Krols R, Laridon A, Van Havenbergh T. Opisthotonus and intrathecal treatment with baclofen (ITB) in children. Eur J Pediatr. 2008 Jun;167(6):641-5. [PubMed]