| Assessment of cardiac dynamics during stress echocardiography by the peak power output-to-left ventricular mass ratio. | |
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MedLine Citation:
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PMID: 21627476 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Peak cardiac power-to-mass and peak mass-to-power are variables that couple cardiac power output with left ventricular (LV) mass at peak exercise or during maximal inotropic stimulation. Quantitative stress echocardiography enables the calculation of power output according to the formula: 133 × 10(-6) × stroke volume per second (ml) × mean blood pressure (BP; mmHg) × heart rate. Power-to-mass may be calculated as LV power output per 100 g of LV mass: 100 g × LV power output divided by LV mass (W/100 g). Conversely, mass-to-power may be estimated by dividing LV mass index by LV power output (g/m(2)/W). With a little rearrangement of the formulas we can write: power-to-mass (W/100 g) = 0.222 × cardiac output (l/min) × mean BP (mmHg)/LV mass (g) and mass-to-power (g/m(2)/W) = LV mass index/0.00222 × cardiac output (l/min) × mean BP (mmHg). These parameters reflect the energy delivery of ventricular myocardium with respect to potential energy that is stored in LV mass. The assessment of peak power-to-mass and peak mass-to-power indices may be useful to distinguish compensatory versus maladaptive remodeling in patients with LV dysfunction. When the integrity of myocardial structure is compromised, a disproportion becomes apparent between maximal cardiac power output and LV mass and this leads to either a reduction of peak power-to-mass or an increase of peak mass-to-power. Preliminary reports have demonstrated the usefulness and the prognostic value of peak power-to-mass and peak mass-to-power in patients with LV systolic dysfunction and coronary artery disease. |
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Authors:
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Frank L Dini |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Future cardiology Volume: 7 ISSN: 1744-8298 ISO Abbreviation: Future Cardiol Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-06-01 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101239345 Medline TA: Future Cardiol Country: England |
Other Details:
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Languages: eng Pagination: 347-56 Citation Subset: IM |
Affiliation:
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Cardiac, Thoracic & Vascular Department, Unità Operativa Cardiologia Universitaria 1, Dipartimento Cardio, Toracico e Vascolare, Azienda Ospedaliera-Universitaria Pisana, Via Paradisa, 2, 56124 - Pisa, Italy. f.dini@ao-pisa.toscana.it. |
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