title: Myocardial ischaemia in patients with primary APS: a 13N-ammonia PET assessment.
abstract: OBJECTIVE
  Evaluate the presence and severity of myocardial ischaemia in a population of asymptomatic patients with primary APS (PAPS) using (13)N-ammonia PET.
  
  
  METHODS
  We studied 36 patients, 18 with a diagnosis of PAPS and 18 healthy volunteers. All patients underwent a two-phase (rest-stress) (13)N-ammonia PET. Myocardial perfusion images were acquired and then analysed by two experts in the field.
  
  
  RESULTS
  We found ischaemia in 7/18 asymptomatic PAPS patients (38.8%). The anterolateral wall was the most commonly affected cardiac territory [5/7 PAPS patients (71.4%)]. In a severity analysis, we found that five patients (71.4%) had mild ischaemia, one patient (14.2%) had moderate ischaemia and another one (14.2%) had severe defects. All the healthy volunteers studied showed normal myocardial perfusion images.
  
  
  CONCLUSIONS
  An important proportion of PAPS patients, even when asymptomatic, showed myocardial perfusion defects assessed with PET. Most of the ischaemic patients had mild defects and the anterolateral wall was the territory mainly affected.
authors.affiliation: Instituto Nacional de Cardiología Ignacio Chávez, Mexico City, México. alexanderick@yahoo.com
authors.forename: E
authors.initials: E
authors.lastname: Alexánderson
authors.forename: A
authors.initials: A
authors.lastname: Gómez-León
authors.forename: A
authors.initials: A
authors.lastname: Vargas
authors.forename: J L
authors.initials: JL
authors.lastname: Romero
authors.forename: C
authors.initials: C
authors.lastname: Sierra Fernández
authors.forename: M
authors.initials: M
authors.lastname: Rodriguez Valero
authors.forename: L
authors.initials: L
authors.lastname: García-Rojas
authors.forename: A
authors.initials: A
authors.lastname: Meave
authors.forename: M-C
authors.initials: MC
authors.lastname: Amigo
mesh_terms: D000328:Adult; D000641:Ammonia; D016736:Antiphospholipid Syndrome / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017202:Myocardial Ischemia / Q000000981:diagnostic imaging*; D009590:Nitrogen Radioisotopes; D049268:Positron-Emission Tomography / Q000379:methods; D019275:Radiopharmaceuticals; D012720:Severity of Illness Index
chemical_list: D009590:Nitrogen Radioisotopes; D019275:Radiopharmaceuticals; D000641:Ammonia