Key result
Acute administration of glyceryl trinitrate augmented peak left ventricular torsion (11.0 vs 8.4 degrees, P<0.05) and systolic torsion velocity, demonstrating sensitivity to loading conditions.
Why the study?
Do acute changes in load (via GTN or fluid loading) affect left ventricular torsion parameters in patients with normal systolic function?
Do acute changes in load (via GTN or fluid loading) affect left ventricular torsion parameters in patients with normal systolic function?
Absolute Event Rate: 11% vs 8.4%
p-value: p=<0.05
Left ventricular torsion parameters are highly sensitive to acute changes in preload and afterload, indicating they must be interpreted in the context of current loading conditions.
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Load dependence of LV torsion warrants interpretive caution; leaves open whether torsion indices improve clinical decision-making.
Burns et al. (2010) studied Normal systolic function (n=18). Glyceryl trinitrate (GTN) and saline fluid loading vs. Baseline was evaluated on Peak torsion (p=<0.05). Acute administration of glyceryl trinitrate augmented peak left ventricular torsion (11.0 vs 8.4 degrees, P<0.05) and systolic torsion velocity, demonstrating sensitivity to loading conditions.
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