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Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
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Endothelial and non-endothelial coronary blood flow reserve and left ventricular dysfunction in systemic hypertension

Aloísio Marchi Rocha1, Vera Maria Cury Salemi, Pedro Alves Lemos Neto

  • 1Heart Institute, Hospital das Clínicas, da Faculdade de Medicina, Universidade de São Paulo, São Paulo, SP, Brazil.

Clinics (Sao Paulo, Brazil)
|June 3, 2009
PubMed

Insights

Hypertensive cardiac disease did not impair coronary blood flow reserve differently between patients with normal and reduced left ventricular systolic function. Both endothelium-dependent and endothelium-independent vasodilation responses were similar across groups, suggesting preserved coronary vasoreactivity.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology
  • Hypertension Research

Background:

  • Coronary blood flow reserve reduction is implicated in the progression of left ventricular hypertrophy to dysfunction.
  • Understanding vasoreactivity in hypertensive heart disease is crucial for managing cardiac outcomes.

Purpose of the Study:

  • To evaluate the impairment of endothelium-dependent and endothelium-independent coronary blood flow reserve in hypertensive patients.
  • To assess the association between coronary blood flow reserve and hypertensive cardiac disease, specifically left ventricular systolic function.

Main Methods:

  • Eighteen hypertensive patients were divided into two groups based on left ventricular fractional shortening (FS).
  • Intracoronary acetylcholine and adenosine were administered to assess endothelium-dependent and endothelium-independent coronary blood flow reserve.
  • Coronary blood flow, coronary vascular resistance, and vasoreactivity were measured.

Main Results:

  • Baseline coronary blood flow was similar between groups with normal (FS >=0.25) and reduced (FS <0.25) left ventricular systolic function.
  • Both endothelium-dependent (acetylcholine) and endothelium-independent (adenosine) coronary blood flow reserve were similar in both groups.
  • Peak acetylcholine/peak adenosine coronary blood flow response and minimal coronary vascular resistance were also comparable between groups.

Conclusions:

  • Hypertensive patients with normal or decreased left ventricular systolic function exhibit similar endothelium-dependent and endothelium-independent coronary blood flow reserve.
  • Vasodilator administration via acetylcholine and adenosine showed comparable effects on coronary blood flow reserve in these patient groups.
  • Casual diastolic blood pressure and end-systolic left ventricular stress were independently associated with fractional shortening.
Abstract

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