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Impaired coronary and myocardial flow in severe aortic stenosis is associated with increased apoptosis: a transthoracic Doppler and myocardial contrast echocardiography study
  1. L Galiuto1,
  2. M Lotrionte1,
  3. F Crea1,
  4. A Anselmi2,
  5. G G L Biondi-Zoccai1,
  6. F De Giorgio4,
  7. A Baldi3,
  8. F Baldi3,
  9. G Possati5,
  10. M Gaudino5,
  11. G W Vetrovec6,
  12. A Abbate6
  1. 1Institute of Cardiology, Department of Cardiovascular Sciences, Catholic University, Rome, Italy
  2. 2Department of Cardiovascular Sciences, University Campus Bio-Medico, Rome, Italy
  3. 3Section of Pathological Anatomy, Second University of Naples, Naples, Italy
  4. 4Institute of Forensic Medicine, Catholic University, Rome, Italy
  5. 5Institute of Cardiovascular Surgery, Department of Cardiovascular Diseases, Catholic University, Rome, Italy
  6. 6Department of Internal Medicine, Virginia Commonwealth University, Richmond, Virginia, USA
  1. Correspondence to:
    Dr Leonarda Galiuto
    Institute of Cardiology, Catholic University of the Sacred Heart, Policlinico A Gemelli, Largo A Gemelli 8, 00168 Rome, Italy; lgaliuto{at}rm.unicatt.it

Abstract

Objective: To test the hypothesis that impaired coronary and myocardial blood flow are linked with increased myocyte apoptosis, thus establishing a link between pressure overload and left ventricular (LV) remodelling.

Methods and results: Peak diastolic coronary blood flow velocity (CBFV) was evaluated at transthoracic Doppler echocardiography, and signal intensity (SI) and the rate of SI rise (β) were measured at myocardial contrast echocardiography in 11 patients with severe aortic stenosis and LV hypertrophy. In the same patients, biopsies were obtained from the anterolateral LV free wall during surgery and analysed for cardiomyocyte apoptosis. LV mass corrected CBFV (CBFVI) was significantly lower in patients than in controls (median 0.100 cm·g/s (interquartile range 0.07–0.115) v 0.130 cm·g/s (0.130–0.160), p  =  0.002). Similarly, SI*β was significantly lower in patients than in controls (11 1/s (8–66) v 83 1/s (73–95), p  =  0.001). Apoptotic rate was increased in aortic stenosis more than 100-fold versus controls (1.2% (0.8–1.4) v 0.01% (0.01–0.01), p < 0.001) and inversely correlated with lower CBFVI and SI*β (r  =  −0.77, p  =  0.001 for both).

Conclusions: Patients with severe aortic stenosis and LV hypertrophy have impaired myocardial perfusion, which is associated with enhanced cardiomyocyte apoptosis. Impaired myocardial perfusion and the ensuing oxygen demand–supply imbalance may, at least partially, be responsible for increased apoptosis and possible transition to heart failure, thus establishing a link between pressure overload, LV remodelling, and heart failure.

  • CBFV, coronary blood flow velocity
  • CBFVI, coronary blood flow velocity index
  • LAD, left anterior descending coronary artery
  • LV, left ventricular
  • MCE, myocardial contrast echocardiography
  • SI, signal intensity
  • TUNEL, terminal deoxynucleotidyl transferase mediated dUTP nick end labelling
  • aortic stenosis
  • apoptosis
  • coronary flow reserve
  • myocardial contrast echocardiography
  • myocardial flow

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Footnotes

  • Published Online First 20 May 2005

  • The authors declare no competing interests.

  • This work has been presented in part at the American Heart Association scientific session, New Orleans, 7–10 November 2004, and at the VIII Euroecho meeting, Athens, 1–4 December 2004.

  • Address for reprints: Dr A Abbate, Department of Medicine, Virginia Commonwealth University, 10025 Bellona Court, Richmond, Virginia 23233, USA; abbatea{at}yahoo.com.

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