title: [Contrast enhanced power Doppler sonography: comparison of various administration forms of the ultrasound contrast agent Levovist].
abstract: OBJECTIVE
  Objective of the present study was the comparison of various administration forms of the ultrasound contrast medium Levovist with regard to duration and intensity of contrast enhancement in patients with tumors of the liver or pancreas.
  
  
  METHODS
  Seven patients with tumors of the liver or pancreas were examined prospectively using power Doppler sonography. Ultrasound contrast enhancement was achieved using Levovist (8 ml, 400 mg/ml) in three different administration forms: 1st as a bolus injection through the main channel, 2nd through the injection valve of an intravenous cannula, or 3rd as a continuous infusion. Semiquantitative evaluation of the degree of contrast enhancement over the course of the examination was conducted by three independent examiners.
  
  
  RESULTS
  Levovist, administered by continuous infusion, resulted in a significantly longer average period of contrast enhancement (9:43 min (extratumoral), 7:34 min (intratumoral)) than did the same dosage administered as a bolus injection through the main channel (6:01 min (extratumoral), 4:54 min (intratumoral), p = 0.0156 (extratumoral); p = 0.0313 (intratumoral), but contrast intensity was decreased. Bolus injection through the injection valve of the i.v. cannula was associated with decreased duration and intensity of contrast enhancement compared with injection through the main channel.
  
  
  CONCLUSIONS
  Compared with bolus injection, the continuous infusion of Levovist resulted in a significant prolongation of the duration but in a decreased intensity of contrast enhancement. Administration of Levovist through the injection valve does not result in optimal contrast enhancement and is therefore not recommended.
authors.affiliation: Abt. Innere Medizin I, Universitätsklinikum Ulm. wolfgang.kratzer@medizin.uni-ulm.de
authors.forename: W
authors.initials: W
authors.lastname: Kratzer
authors.forename: V
authors.initials: V
authors.lastname: Kächele
authors.forename: E
authors.initials: E
authors.lastname: Merkle
authors.forename: R A
authors.initials: RA
authors.lastname: Mason
authors.forename: M
authors.initials: M
authors.lastname: Büchner
authors.forename: C
authors.initials: C
authors.lastname: von Tirpitz
authors.forename: M
authors.initials: M
authors.lastname: Pfeiffer
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003287:Contrast Media / Q000008:administration & dosage*; D005260:Female; D006801:Humans; D007262:Infusions, Intravenous; D007275:Injections, Intravenous; D008113:Liver Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000000981:diagnostic imaging*; D011134:Polysaccharides / Q000008:administration & dosage*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D018608:Ultrasonography, Doppler
chemical_list: D003287:Contrast Media; D011134:Polysaccharides; C059891:SHU 508
vernacular_title: Kontrastverstärkte Power-Doppler-Sonographie: Vergleich verschiedener Applikationsformen des Ultraschallkontrastverstärkers Levovist.