Key result
Dynamic Doppler echocardiographic analysis revealed higher gradients for the 19-mm St Jude compared to the 20-mm Medtronic Hall valve at a given flow rate (P<0.05).
Why the study?
Does Doppler echocardiography accurately assess the hemodynamic relevance and myocardial energy expenditure of small-diameter aortic mechanical prostheses?
Observational
Does Doppler echocardiography accurately assess the hemodynamic relevance and myocardial energy expenditure of small-diameter aortic mechanical prostheses?
p-value: p=<0.05
Doppler-derived gradients across small-diameter aortic mechanical prostheses accurately reflect myocardial energy expenditure despite pressure recovery, and dynamic pressure-flow analysis can detect small functional differences between valves.
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Doppler gradients in small aortic prostheses may reflect myocardial workload; animal data leave open human applicability.
Marcus et al. (1998) conducted an observational in Small-diameter aortic mechanical prostheses. 19-mm St Jude prosthesis vs. 20-mm Medtronic Hall prosthesis was evaluated on Pressure-flow relations and transprosthetic gradients (p=<0.05). Dynamic Doppler echocardiographic analysis revealed higher gradients for the 19-mm St Jude compared to the 20-mm Medtronic Hall valve at a given flow rate (P<0.05).
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