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Sandifer Syndrome - Posturing & Explanation

Clinical Image

Sandifer Syndrome - 4-month-old infant showing opisthotonic arching posture, dystonia, with normal EEG
4-month-old with Sandifer syndrome: note the characteristic back-arching opisthotonic posture, with neck hyperextension. EEG was normal.

What is Sandifer Syndrome?

Sandifer syndrome (SS) is a condition in which gastroesophageal reflux disease (GERD) - or hiatal hernia - triggers paroxysmal dystonic posturing in infants and young children. Named after Dr. Paul Sandifer (described in 1964 by Sandifer and Kinsbourne), it is the classic GI-neurological mimic of a seizure disorder.
  • Age: typically 2 months to 2 years
  • More common in boys
  • Associated with GERD, esophagitis, or hiatal hernia

The Classic Postures (What You See)

PostureDescription
OpisthotonusSevere arching of the back, rigid hyperextension of the spine
Retrocollis/TorticollisHead and neck tilted/twisted; head tilted downward or laterally
LaterocollisLateral neck deviation
Elbow flexionElbows flexed and held posteriorly
Hip hyperextensionHips extended during episodes
Staring/eye deviationBlank stare or eye movement changes
Episodes are typically:
  • Brief (seconds to minutes)
  • Paroxysmal - sudden onset and offset
  • Post-prandial - occurring during or shortly after feeds
  • Absent during sleep - a key distinguishing feature from epilepsy
  • No loss of consciousness, no postictal state

Pathophysiology (Proposed Mechanism)

Esophageal irritation from acid reflux activates vagal afferents, which trigger abnormal motor responses via central neural pathways - particularly the nucleus tractus solitarius and related brainstem motor nuclei - resulting in dystonic posturing and torticollis.
An alternative hypothesis: the posturing is a voluntary protective reflex to alleviate esophageal discomfort. Evidence from Puntis et al. shows that the arching posture increases the amplitude and velocity of esophageal peristalsis, which may promote acid clearance and provide symptom relief. Either way, the posturing resolves when GERD is treated effectively.

Why It Mimics Seizures (The Diagnostic Trap)

FeatureSandifer SyndromeEpileptic Seizure
TriggerFeeding / refluxVariable
TimingPost-prandialAny time
During sleepAbsentMay occur
Loss of consciousnessNoOften yes
Postictal stateNoYes
EEGNormalAbnormal
Treatment responseAnti-reflux therapyAnticonvulsants
From Rosen's Emergency Medicine: "Infants with gastrointestinal reflux may have Sandifer syndrome and appear to have seizure-like movements with episodes of abnormal posturing, arching of the back, and torticollis."
From Localization in Clinical Neurology, 8e: "Sandifer syndrome refers to a spasmodic tilting downward of the head and neck after eating a meal, occurring mainly in boys as a result of gastroesophageal reflux."

Associated Clinical Features

  • Regurgitation / vomiting
  • Irritability (especially around feeds)
  • Poor weight gain / failure to thrive
  • Recurrent aspiration pneumonia (acid microaspiration)
  • Iron-deficiency anemia (from occult esophageal blood loss)
  • Hiatal hernia (in a subset)

Diagnosis

  • Clinical diagnosis primarily
  • EEG - normal (rules out epilepsy)
  • Barium swallow / upper GI series - shows GERD, possible hiatal hernia
  • Esophageal pH monitoring - gold standard to confirm acid reflux episodes correlate with dystonic events
  • Upper endoscopy - may show esophagitis

Treatment

  1. Conservative (first line)
    • Smaller, more frequent feedings
    • Upright positioning after feeds (avoid car seat - worsens reflux)
    • Thickened formula
  2. Medical
    • Proton pump inhibitors (e.g., omeprazole 1 mg/kg/day in 2 divided doses) - episodes typically resolve within 3-4 weeks
    • H2 blockers
  3. Surgical
    • Nissen fundoplication for severe, refractory GERD unresponsive to medical therapy
Complete resolution of posturing with anti-reflux treatment confirms the diagnosis.
Key teaching point: In any infant presenting with "seizure-like" stiffening or arching - especially post-feed, with normal EEG, normal neurological exam - always consider Sandifer syndrome and actively look for GERD. - Tintinalli's Emergency Medicine, Table 138-3
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