- Poster presentation
- Open Access
The effect of dobutamine stress on diastolic filling rates in obese subjects
© Rider et al; licensee BioMed Central Ltd. 2009
- Published: 28 January 2009
- Obese Subject
- Diastolic Function
- Filling Rate
- Left Ventricular Filling
Our aim was to determine the effect of catecholamine stress on left ventricular filling rates in obesity and compare this to normal weight subjects.
Obesity is associated with diastolic dysfunction at rest. However, it is unknown whether this is exacerbated during stress, i.e. whether the "relaxation reserve" of the heart is impaired in obesity. We aimed to determine the effect of simulated exercise on diastolic function in obese subjects without co-morbidity, and compared this to normal weight subjects.
45 healthy subjects (28 obese, BMI 39.8 ± 8.0 &17 lean controls 21.6 ± 1.6) were enrolled into the study. All subjects were screened for identifiable cardiac risk factors and excluded if present. All subjects underwent cardiac MR imaging at 1.5 T for peak diastolic peak filling rate (PFR, derived from LV volume time curves, normalized to end-diastolic volume). 11 of the normal weight and 20 obese subjects underwent repeat assessment of diastolic function during dobutamine infusion.
Similar levels of stress result in significantly smaller increases in diastolic PFR in obese compared to lean controls. Thus, the "relaxation reserve" of the heart is impaired in obesity.
This article is published under license to BioMed Central Ltd.