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Assessment of the relationship between distal occluded pressure and angiographically evident collateral flow during
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The presence of collateral circulation in coronary angiography is closely linked to higher distal coronary pressure during angioplasty balloon inflation. This finding highlights the importance of collateral flow in maintaining pressure during percutaneous coronary intervention.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Coronary Artery Disease
Background:
- Coronary artery disease (CAD) management often involves assessing stenosis severity.
- Collateral circulation plays a role in myocardial perfusion but its impact on pressure during intervention is less understood.
Purpose of the Study:
- To investigate the relationship between angiographically visible collateral filling and distal coronary pressure during balloon inflation in patients undergoing angioplasty.
- To determine if collateral flow influences pressure dynamics in the occluded artery segment.
Main Methods:
- Retrospective analysis of 83 patients undergoing coronary angioplasty.
- Patients categorized into three groups based on stenosis severity and collateral presence.
- Measurement of distal occluded pressure during balloon inflation and comparison across groups.
Main Results:
- Distal occluded pressure was significantly lower in patients without visible collaterals (Group I) compared to those with collaterals (Groups II and III).
- The distal occluded pressure/aortic pressure ratio was also significantly lower in Group I.
- No significant differences were observed in patient demographics, lesion characteristics, or post-angioplasty outcomes among the groups.
Conclusions:
- Angiographically evident collateral flow is closely correlated with higher distal coronary artery pressure during angioplasty balloon inflation.
- Collateral circulation appears to buffer pressure drop in the occluded artery segment during intervention.
- These findings underscore the physiological significance of collateral vessels in the context of percutaneous coronary intervention.
Abstract:
The relationship between the presence of collateral filling on the baseline coronary angiogram and the distal occluded pressure obtained during balloon inflation was examined in 83 patients undergoing coronary angioplasty. The patients were divided into three groups: Group I (n = 40) had conventional stenoses (80% to 95% luminal diameter narrowing) without angiographically evident collaterals, group II (n = 22) had conventional stenoses with angiographically present collaterals, and group III (n = 21) had total or functional total occlusions (99% to 100% diameter narrowing) with angiographically evident collateral flow. There was no significant difference in age, sex, vessel distribution, clinical class, residual gradient, or residual percent stenosis following successful angioplasty among the three groups. The distal occluded pressure in group I (18 +/- 5 mm Hg) was, however, significantly lower than the distal occluded pressure in either group II (34 +/- 7 mm Hg) or group III (36 +/- 9 mm Hg) (p less than 0.001). This could not be explained by differences in aortic pressure, since there was no correlation between the mean aortic blood pressure and the distal occluded pressure and since the distal occluded pressure/aortic pressure ratio in group I (0.23 +/- 0.07) was significantly lower than that of group II (0.41 +/- 0.09) or group III (0.41 +/- 0.11) (p less than 0.001). These findings indicate a close correlation between the presence of angiographically evident collateral flow and the distal coronary artery pressure during an angioplasty balloon inflation.(ABSTRACT TRUNCATED AT 250 WORDS)