title: Right ventricular dysfunction following severe scorpion envenomation.
abstract: OBJECTIVE
  Evaluation of right ventricular (RV) performance in patients presenting with pulmonary edema following scorpion envenomation.
  
  
  METHODS
  Cohort study.
  
  
  METHODS
  Medical intensive care unit of a teaching hospital.
  
  
  METHODS
  Eight consecutive adult patients stung by yellow scorpion Androctonus australis and presenting with pulmonary edema at hospital admission.
  
  
  METHODS
  In all patients, standard hemodynamic parameters and RV volumes were measured using a pulmonary artery catheter equipped with a rapid responding thermistor enabling measurement of RV ejection fraction (RVEF).
  
  
  METHODS
  Hemodynamic evaluation was performed at the time of hospital admission prior to any therapeutic intervention and just before the removal of the pulmonary catheter (2.3 +/- 0.5 days after admission) in the surviving patients (n = 7).
  
  
  RESULTS
  All patients had a decreased RVEF (24 +/- 7%) and cardiac index (2.44 +/- 0.5 L/min/m2) and increased pulmonary artery occlusion pressure (23 +/- 6 mm Hg). Right ventricular end-systolic pressure/volume ratio was decreased (.56 +/- .19 mm Hg/mL/m2), suggesting an altered RV contractility. Follow-up evaluation performed in survivors, without any inotropic support, showed hemodynamic changes reflecting a trend toward full recovery. Right ventricular ejection fraction and cardiac index improved markedly (from 24 +/- 7% to 39 +/- 10% and from 2.44 +/- 0.5 to 4 +/- .3 L/min/m2, respectively). Pulmonary artery occlusion pressure, peak systolic pulmonary artery pressure, and mean pulmonary artery pressure decreased significantly from baseline values (12 +/- 3 mm Hg, 29 +/- 5 mm Hg, and 20 +/- 4 mm Hg, respectively). Right ventricular end systolic pressure/volume ratio remained almost constant, suggesting that afterload enhancement accounted predominantly for RVEF improvement.
  
  
  CONCLUSIONS
  These data show that RV function impairment is associated with left ventricular dysfunction, suggesting similarities between left ventricular and RV alterations following severe scorpion envenomation providing further arguments to the hypothesis of scorpionic myocarditis.
authors.affiliation: Service de Réanimation Polyvalente, Hopital Universitaire de Monastir, Tunisia.
authors.forename: S
authors.initials: S
authors.lastname: Nouira
authors.forename: F
authors.initials: F
authors.lastname: Abroug
authors.forename: H
authors.initials: H
authors.lastname: Haguiga
authors.forename: M
authors.initials: M
authors.lastname: Jaafoura
authors.forename: R
authors.initials: R
authors.lastname: Boujdaria
authors.forename: S
authors.initials: S
authors.lastname: Bouchoucha
mesh_terms: D000328:Adult; D000818:Animals; D002302:Cardiac Output / Q000502:physiology; D015331:Cohort Studies; D005260:Female; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D008297:Male; D009205:Myocarditis / Q000209:etiology; D011654:Pulmonary Edema / Q000209:etiology / Q000503:physiopathology; D065008:Scorpion Stings / Q000150:complications* / Q000503:physiopathology; D012605:Scorpions; D013318:Stroke Volume / Q000502:physiology; D018487:Ventricular Dysfunction, Left / Q000209:etiology / Q000503:physiopathology; D018497:Ventricular Dysfunction, Right / Q000209:etiology* / Q000503:physiopathology