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Coronary back flow pressure is elevated in association with increased left ventricular end-diastolic pressure in
Y Doi1, T Masuyama, K Yamamoto
1First Department of Medicine, Osaka University School of Medicine, Suita, Japan.
Insights
Left ventricular end-diastolic pressure (EDP) positively correlates with coronary inflow back pressure. Increased EDP may reduce maximal coronary flow and reserve, impacting coronary pressure-flow relations.
Area of Science:
- Cardiology
- Physiology
Background:
- The relationship between left ventricular diastolic pressure and coronary circulation is crucial for understanding myocardial perfusion.
- Assessing coronary pressure-flow dynamics is essential for diagnosing and managing various cardiovascular conditions.
Purpose of the Study:
- To investigate the influence of left ventricular end-diastolic pressure (LVEDP) on the diastolic coronary pressure-flow velocity relation in humans.
- To determine how LVEDP affects coronary inflow resistance and maximal coronary flow reserve.
Main Methods:
- Analyzed instantaneous diastolic coronary pressure-Doppler flow velocity relation in 15 patients with normal coronary arteries.
- Measured relation at rest and during papaverine-induced maximal vasodilation.
- Utilized linear regression to determine the slope (alpha PF) and zero-flow pressure intercept (Pzf index).
Main Results:
- The Pzf index showed a positive correlation with LVEDP at rest (r = 0.64) and during maximal vasodilation (r = 0.58).
- No significant correlation was found between alpha PF and LVEDP.
- Elevated LVEDP is associated with increased back pressure to coronary inflow.
Conclusions:
- Increased LVEDP may elevate the back pressure to coronary inflow, as indicated by the Pzf index.
- This elevation can lead to a rightward shift in the maximally dilated coronary pressure-flow relation.
- Consequently, maximal coronary flow and reserve may be reduced at any given perfusion pressure in individuals with higher LVEDP.
Abstract:
To clarify the effect of left ventricular (LV) diastolic pressure on the coronary pressure-flow relation in humans, the instantaneous diastolic coronary pressure-Doppler flow velocity relation was analyzed at rest and during papaverine-induced maximal vasodilation in 15 patients with angiographically normal coronary arteries. The values for slope (alpha PF) and zero-flow pressure intercept (Pzf index) of the instantaneous diastolic coronary pressure-flow velocity relation were obtained by a linear regression analysis. Although alpha PF did not correlate with LV end-diastolic pressure (EDP), the Pzf index correlated positively with LVEDP both at rest and during maximal vasodilation (r = 0.64, P < 0.05 and r = 0.58, P < 0.05, respectively). Thus, the back pressure to coronary inflow, as indicated by the Pzf index, may be elevated in patients with increased LVEDP, resulting in the rightward shift of the maximally dilated coronary pressure-flow relation and decreased maximal coronary flow and reserve at any given perfusion pressure.