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[Doppler microprobe allows evaluation of local coronary circulation]
R Gil1, C Di Mario, P W Serruys
1Klinika Kardiologii Pomorskiej Akademii Medycznej, Szczecin.
Insights
Coronary flow reserve (CFR) is significantly reduced in patients with coronary artery stenosis. This study used intracoronary Doppler guidewire to assess coronary flow in normal versus stenotic vessels.
Area of Science:
- Cardiology
- Vascular Physiology
- Diagnostic Imaging
Context:
- Ischemic heart disease affects coronary circulation.
- Accurate assessment of coronary flow is crucial for diagnosis and management.
- Intracoronary Doppler guidewire technology offers direct measurement of coronary blood flow parameters.
Purpose:
- To evaluate local coronary flow dynamics in patients with ischemic heart disease.
- To compare coronary flow reserve (CFR) and diastolic-systolic velocity ratio (DSVR) in normal versus stenotic coronary arteries.
- To assess the impact of papaverine-induced hyperemia on these parameters.
Summary:
- A study of 42 ischemic heart disease patients divided into normal (<30% stenosis) and stenotic (>60% stenosis) groups.
- Measurements included averaged peak velocity (APV) and DSVR at rest and during hyperemia.
- Coronary flow reserve (CFR) was significantly lower in stenotic vessels (1.8-2.0) compared to normal vessels (2.75-3.3).
Impact:
- Demonstrates reduced coronary flow reserve in the presence of significant coronary artery stenosis.
- Highlights the utility of intracoronary Doppler guidewire for quantifying flow abnormalities.
- Provides quantitative data on flow parameters that may aid in clinical decision-making for patients with coronary artery disease.
Abstract:
The local coronary flow in 42 patients (mean age: 59 +/- 9 years) with ischemic heart disease was assessed by means of an 0.018" intracoronary Doppler guidewire. Study population was divided into two groups: group I--"normal vessels" (diameter stenosis < 30%) and group II--"stenosis vessels" (diameter stenosis > 60%). Measurements of: averaged peak velocity (APV), diastolic-systolic velocity ratio (DSVR) were performed in proximal segments of normal vessels and proximally to stenosis in group II. APV and DSVR were recorded at rest (bas) and during papaverine induced hyperemia. Coronary flow reserve (CFR) was calculated as ratio hyperemic and resting values of APV. Mean value of APV at rest was highest for left main stem, lowest for venous by-passes (SVBG) but did not differ among three coronary arteries (LAD, LCX, RCA). CFR value was significantly higher for group I then for group II (2.75-3.3 vs 1.8-2.0) but did not differ significantly among particular arteries in both groups. Mean value of DSVRbas in both examined groups was lowest for right coronary artery and for SVBG (ca. 1.0) and did not change significantly during hyperemia. This value was significantly higher (ca. 2.0) for left coronary arteries (LAD, LCX) then for RCA and SVBG and significantly decreased after administration of papaverine.