title: An effect of magnesium on neuromuscular function in parturients.
abstract: OBJECTIVE
  To determine the effects of magnesium sulfate on neuromuscular transmission in parturients.
  
  
  METHODS
  Open-label, clinical study.
  
  
  METHODS
  Preeclamptic patients at a university-affiliated hospital.
  
  
  METHODS
  12 pregnant patients, ages 18 to 40 years, with preeclampsia or entering preterm labor.
  
  
  METHODS
  Patients were treated with magnesium sulfate. Train-of-four (TOF) recordings of the adductor pollicis muscle were obtained before and 30 minutes after the magnesium sulfate infusion.
  
  
  RESULTS
  Each contractile response in the control TOF showed an increase in the tension developed in response to supramaximal stimulation. The TOF responses after magnesium sulfate did not demonstrate this phenomenon, but rather developed fade. The T4/T1 ratios ranged from 0.72 to 0.92.
  
  
  CONCLUSIONS
  In this patient population, clinically relevant infusions of magnesium sulfate produced significant changes in neuromuscular transmission as manifested by loss of treppe phenomenon and diminished TOF response to ulnar nerve stimulation.
authors.affiliation: Anesthesiology Department, Monmouth Medical Center, Long Branch, New Jersey, USA.
authors.forename: R M
authors.initials: RM
authors.lastname: Ross
authors.forename: T
authors.initials: T
authors.lastname: Baker
mesh_terms: D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D008278:Magnesium Sulfate / Q000494:pharmacology*; D009469:Neuromuscular Junction / Q000187:drug effects*; D011247:Pregnancy; D012640:Seizures / Q000517:prevention & control*; D015145:Tocolysis / Q000379:methods*
chemical_list: D008278:Magnesium Sulfate