title: Electromechanical dissociation in newborns treated with extracorporeal membrane oxygenation: an extreme form of cardiac stun syndrome.
abstract: OBJECTIVE
  To recognize cardiac stun syndrome and electromechanical dissociation in patients receiving extracorporeal membrane oxygenation (ECMO), and to define patients at risk.
  
  
  METHODS
  Retrospective review.
  
  
  METHODS
  Tertiary neonatal ICU.
  
  
  METHODS
  Four newborn patients with cardiorespiratory failure who developed signs of cardiac stun syndrome and electromechanical dissociation early in the ECMO course.
  
  
  RESULTS
  Initially, these patients had metabolic acidosis, chest roentgenograms showing pulmonary granularity and moderate cardiomegaly, and symptoms of severe respiratory distress. Cardiac dysfunction was apparent after ECMO was begun, with poor perfusion, pale color, narrow pulse pressure, and tachycardia despite normovolemia. Within 1 to 2 hrs, electromechanical dissociation occurred manifested by the absence of pulse pressure, palpable pulse, cardiac sounds, and apical impulse while on 50% to 70% bypass. All patients survived.
  
  
  METHODS
  Patients received ECMO, calcium gluconate, sodium bicarbonate, and dobutamine.
  
  
  CONCLUSIONS
  Patients with cardiac stun syndrome have symptoms similar to severe respiratory distress syndrome, and may require ECMO support. In the ECMO patient, cardiac stun syndrome and electromechanical dissociation can be confused with low circuit volume, pneumothorax, or cardiac tamponade. Early recognition of electromechanical dissociation may improve care and outcome. Cardiac stun syndrome can be treated successfully with ECMO.
authors.affiliation: Department of Pediatrics, University of Louisville, KY.
authors.forename: E M
authors.initials: EM
authors.lastname: Rosenberg
authors.forename: L N
authors.initials: LN
authors.lastname: Cook
mesh_terms: D015199:Extracorporeal Membrane Oxygenation / Q000009:adverse effects; D006321:Heart / Q000503:physiopathology*; D006327:Heart Block / Q000209:etiology*; D006801:Humans; D007231:Infant, Newborn; D012131:Respiratory Insufficiency / Q000628:therapy; D012189:Retrospective Studies; D013577:Syndrome