Assessment of transmural distribution of myocardial perfusion with contrast echocardiography

Andre Z. Linka, Jiri Sklenar, Kevin Wei, Ananda R. Jayaweera, Danny M. Skyba, Sanjiv Kaul

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

Background - We hypothesized that by using our newly defined method of destroying microbubbles and measuring their rate of tissue replenishment, we could assess the transmural distribution of myocardial perfusion. Methods and Results - We studied 12 dogs before and after creation of left anterior descending coronary artery stenoses both at rest and during hyperemia (n = 62 stages). Microbubbles were administered as a constant infusion, and myocardial contrast echocardiography (MCE) was performed with the use of different pulsing intervals. The video intensity versus pulsing interval plots derived from each myocardial pixel were fitted to an exponential function: y = A(1-e(βt)), where A reflects microvascular cross-sectional area (or myocardial blood volume), and β reflects mean myocardial microbubble velocity. The product A · β represents myocardial blood flow (MBF). Average values for these parameters were derived from the endocardial and epicardial regions of interest placed over the left anterior descending coronary artery bed. Radiolabeled microsphere-derived MBF was also measured from the same regions. There was poor correlation between radiolabeled microsphere-derived MBF and A-endocardial/epicardial ratios (EER) (r = 0.46). The correlation with β-EER was better (r = 0.69, P <0.01). The best correlation with radiolabeled microsphere-derived MBF-EER was noted with A · β-EER (r = 0.88, P <0.01). Conclusions - The transmural distribution of myocardial perfusion can be accurately assessed with MCE with the use of our newly described method of tissue replenishment of microbubbles after their ultrasound-induced destruction. In the model studied, an uncoupling of the transmural distribution of MBF and myocardial blood volume was observed during reversal of the MBF-EER.

Original languageEnglish (US)
Pages (from-to)1912-1920
Number of pages9
JournalCirculation
Volume98
Issue number18
StatePublished - Nov 3 1998
Externally publishedYes

Fingerprint

Echocardiography
Microbubbles
Perfusion
Microspheres
Blood Volume
Coronary Stenosis
Hyperemia
Coronary Vessels
Dogs

Keywords

  • Blood flow
  • Echocardiography
  • Myocardium
  • Perfusion

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Linka, A. Z., Sklenar, J., Wei, K., Jayaweera, A. R., Skyba, D. M., & Kaul, S. (1998). Assessment of transmural distribution of myocardial perfusion with contrast echocardiography. Circulation, 98(18), 1912-1920.

Assessment of transmural distribution of myocardial perfusion with contrast echocardiography. / Linka, Andre Z.; Sklenar, Jiri; Wei, Kevin; Jayaweera, Ananda R.; Skyba, Danny M.; Kaul, Sanjiv.

In: Circulation, Vol. 98, No. 18, 03.11.1998, p. 1912-1920.

Research output: Contribution to journalArticle

Linka, AZ, Sklenar, J, Wei, K, Jayaweera, AR, Skyba, DM & Kaul, S 1998, 'Assessment of transmural distribution of myocardial perfusion with contrast echocardiography', Circulation, vol. 98, no. 18, pp. 1912-1920.
Linka, Andre Z. ; Sklenar, Jiri ; Wei, Kevin ; Jayaweera, Ananda R. ; Skyba, Danny M. ; Kaul, Sanjiv. / Assessment of transmural distribution of myocardial perfusion with contrast echocardiography. In: Circulation. 1998 ; Vol. 98, No. 18. pp. 1912-1920.
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AU - Jayaweera, Ananda R.

AU - Skyba, Danny M.

AU - Kaul, Sanjiv

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N2 - Background - We hypothesized that by using our newly defined method of destroying microbubbles and measuring their rate of tissue replenishment, we could assess the transmural distribution of myocardial perfusion. Methods and Results - We studied 12 dogs before and after creation of left anterior descending coronary artery stenoses both at rest and during hyperemia (n = 62 stages). Microbubbles were administered as a constant infusion, and myocardial contrast echocardiography (MCE) was performed with the use of different pulsing intervals. The video intensity versus pulsing interval plots derived from each myocardial pixel were fitted to an exponential function: y = A(1-e(βt)), where A reflects microvascular cross-sectional area (or myocardial blood volume), and β reflects mean myocardial microbubble velocity. The product A · β represents myocardial blood flow (MBF). Average values for these parameters were derived from the endocardial and epicardial regions of interest placed over the left anterior descending coronary artery bed. Radiolabeled microsphere-derived MBF was also measured from the same regions. There was poor correlation between radiolabeled microsphere-derived MBF and A-endocardial/epicardial ratios (EER) (r = 0.46). The correlation with β-EER was better (r = 0.69, P <0.01). The best correlation with radiolabeled microsphere-derived MBF-EER was noted with A · β-EER (r = 0.88, P <0.01). Conclusions - The transmural distribution of myocardial perfusion can be accurately assessed with MCE with the use of our newly described method of tissue replenishment of microbubbles after their ultrasound-induced destruction. In the model studied, an uncoupling of the transmural distribution of MBF and myocardial blood volume was observed during reversal of the MBF-EER.

AB - Background - We hypothesized that by using our newly defined method of destroying microbubbles and measuring their rate of tissue replenishment, we could assess the transmural distribution of myocardial perfusion. Methods and Results - We studied 12 dogs before and after creation of left anterior descending coronary artery stenoses both at rest and during hyperemia (n = 62 stages). Microbubbles were administered as a constant infusion, and myocardial contrast echocardiography (MCE) was performed with the use of different pulsing intervals. The video intensity versus pulsing interval plots derived from each myocardial pixel were fitted to an exponential function: y = A(1-e(βt)), where A reflects microvascular cross-sectional area (or myocardial blood volume), and β reflects mean myocardial microbubble velocity. The product A · β represents myocardial blood flow (MBF). Average values for these parameters were derived from the endocardial and epicardial regions of interest placed over the left anterior descending coronary artery bed. Radiolabeled microsphere-derived MBF was also measured from the same regions. There was poor correlation between radiolabeled microsphere-derived MBF and A-endocardial/epicardial ratios (EER) (r = 0.46). The correlation with β-EER was better (r = 0.69, P <0.01). The best correlation with radiolabeled microsphere-derived MBF-EER was noted with A · β-EER (r = 0.88, P <0.01). Conclusions - The transmural distribution of myocardial perfusion can be accurately assessed with MCE with the use of our newly described method of tissue replenishment of microbubbles after their ultrasound-induced destruction. In the model studied, an uncoupling of the transmural distribution of MBF and myocardial blood volume was observed during reversal of the MBF-EER.

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KW - Myocardium

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