Key result
Blood donation reduces maximum LA volume ~25% and decreases reservoir strain, confirming preload dependency.
Why the study?
The effects of preload variation on echocardiographic indices of left atrial function remain unclear.
Does acute preload reduction via blood donation alter left atrial volumetric and strain echocardiographic indices in healthy dogs?
Does acute preload reduction via blood donation alter left atrial volumetric and strain echocardiographic indices in healthy dogs?
Absolute Event Rate: 0.51% vs 0.676%
p-value: p=0.0011
In healthy dogs, acute preload reduction significantly decreases maximum left atrial volume and reservoir/contractile strain, while minimum volume and conduit strain remain stable, indicating the latter are less preload-dependent.
Preload reduction alters LA volume and reservoir strain in healthy dogs; leaves open relevance to clinical disease or humans.
Left atrial function (LAF) is crucial to hemodynamics, but the effects of preload variation on its echocardiographic indices remain unclear. This study aimed to identify preload-independent phasic LA echocardiographic variables and to assess blood donor dogs as a hypovolemia model. Twenty-six healthy, client-owned dogs underwent transthoracic echocardiography before and after standardized blood donation. Phasic LA volumes and strain parameters were assessed, and a subgroup of dogs donating ≥ 10 mL/kg was also analyzed. After blood withdrawal, significant reductions were observed in maximum LA volume (p = 0.0350), LA ejection volume and LA ejection fraction (p = 0.0204), reservoir strain (p = 0.0149), and contractile strain (p = 0.0149), confirming their preload dependency. Conversely, minimum volume (p = 1.0000), pre-atrial contraction volume (p = 0.4373), and conduit strain (p = 0.2156) did not change significantly in the subgroup, indicating lower sensitivity to acute volume variation. These results demonstrate that different LA functional phases respond differently to preload changes and suggest that some parameters may be more stable for clinical interpretation under variable hemodynamic conditions. The blood donation model proved to be a practical and ethically acceptable method for assessing preload-dependent variables in conscious dogs.
No takes yet. Share an insight, caveat, or question.
Cepinho et al. (2026) studied Healthy (blood donors) (n=26). Acute preload reduction via blood donation vs. Baseline (pre-donation) was evaluated on Maximum left atrial volume (Vol_max) (p=0.0011). Acute preload reduction via blood donation significantly reduced maximum left atrial volume from 0.676 to 0.510 mL/kg (p=0.0011) and decreased reservoir strain, confirming their preload dependency.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: