title: Skeletal scintigraphy indicates disease severity of cardiac involvement in patients with senile systemic amyloidosis.
abstract: BACKGROUND
  Senile systemic amyloidosis (SSA) is a common aging phenomenon in the elderly population. Nevertheless, pre-mortem diagnosis of SSA is rare. Thus, data on clinical characterization and disease severity are limited.
  
  
  METHODS
  36 consecutive SSA patients (71.6 [64.7-82.7]years) were evaluated by electrocardiography, echocardiography, laboratory tests, and (99m)Technetium-3,3-diphosphono-1,2-propanodicarboxylic acid ((99m)Tc-DPD) scintigraphy (n=20).
  
  
  RESULTS
  In addition to cardiac involvement, amyloid deposition was found in rectum (n=6), peripheral nerves (n=2), and urinary bladder (n=2). Five patients showed low voltage pattern. Thickness of interventricular septum (IVS) was 20 [12-27]mm. LV longitudinal function was diminished (TDI-s 5 [3-11] cm/s; MAPSE 6.5 [2.5-19]mm; TAPSE 12.5 [2-24]mm). LV systolic function (LV-EF<45%) was markedly decreased in 19 patients. Plasma levels of troponin T (0.05 [0.01-0.23]µg/L) and NT-proBNP (4318 [205-16597]ng/L) were elevated. (99m)Tc-DPD heart retention was 7.8 [2.4-11.0]% and correlated with MAPSE (ρ=-0.716; p=0.0018), TAPSE (ρ=-0.491; p<0.05), and IVS (ρ=0.556; p=0.0153). Heart-to-body ratio correlated with MAPSE (ρ=-0.771; p=0.0018), IVS (ρ=0.603; p=0.0086). Twelve patients died during follow-up of 27.4 [0.1-106.2]months. Exclusively (99m)Tc-DPD heart retention, diastolic dysfunction and in trend MAPSE were associated with patient's outcome. Interestingly, risk predictors that were well established in patients with AL amyloidosis were not predictive for survival in patients with SSA.
  
  
  CONCLUSIONS
  This study gave first evidence that (99m)Tc-DPD HR may be capable to display the extent of cardiac amyloid deposition. Moreover, this study suggested that (99m)Tc-DPD HR, diastolic dysfunction and in trend MAPSE are associated with poor outcome. Nevertheless, these findings need to be established in a larger prospective trial.
authors.affiliation: Department of Cardiology, Angiology, and Respiratory Medicine, Im Neuenheimer Feld 410, Heidelberg, Germany. Arnt_Kristen@med.uni-heidelberg.de
authors.forename: Arnt V
authors.initials: AV
authors.lastname: Kristen
authors.forename: Sabine
authors.initials: S
authors.lastname: Haufe
authors.forename: Stefan O
authors.initials: SO
authors.lastname: Schonland
authors.forename: Ute
authors.initials: U
authors.lastname: Hegenbart
authors.forename: Philipp A
authors.initials: PA
authors.lastname: Schnabel
authors.forename: Christoph
authors.initials: C
authors.lastname: Röcken
authors.forename: Stefan
authors.initials: S
authors.lastname: Hardt
authors.forename: Peter
authors.initials: P
authors.lastname: Lohse
authors.forename: Anthony D
authors.initials: AD
authors.lastname: Ho
authors.forename: Uwe
authors.initials: U
authors.lastname: Haberkorn
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Dengler
authors.forename: Klaus
authors.initials: K
authors.lastname: Altland
authors.forename: Hugo A
authors.initials: HA
authors.lastname: Katus
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000686:Amyloidosis / Q000000981:diagnostic imaging* / Q000453:epidemiology; D015331:Cohort Studies; D005260:Female; D006321:Heart / Q000000981:diagnostic imaging*; D006801:Humans; D008297:Male; D008875:Middle Aged; D058225:Plaque, Amyloid / Q000000981:diagnostic imaging* / Q000453:epidemiology; D011877:Radionuclide Imaging; D012720:Severity of Illness Index; D018487:Ventricular Dysfunction, Left / Q000000981:diagnostic imaging / Q000453:epidemiology