Continuous thermodilution demonstrated significantly less variability on repeated measurements than bolus thermodilution in assessing coronary microvascular function (12.7% vs 31.26%; p<0.001).
RCT
1:1 ratio
Does continuous thermodilution improve the reproducibility of coronary microvascular function assessment compared to bolus thermodilution in patients with ANOCA?
Continuous thermodilution provides significantly more reproducible assessments of coronary microvascular function than standard bolus thermodilution in patients with ANOCA.
Absolute Event Rate: 12.7% vs 31.26%
p-value: p=<0.001
BACKGROUND: A bolus thermodilution-derived index of microcirculatory resistance (IMR) has emerged as the standard for assessing coronary microvascular dysfunction (CMD). Continuous thermodilution has recently been introduced as a tool to quantify absolute coronary flow and microvascular resistance directly. Microvascular resistance reserve (MRR) derived from continuous thermodilution has been proposed as a novel metric of microvascular function, which is independent of epicardial stenoses and myocardial mass. AIMS: We aimed to assess the reproducibility of bolus and continuous thermodilution in assessing coronary microvascular function. METHODS: Patients with angina and non-obstructive coronary artery disease (ANOCA) at angiography were prospectively enrolled. Bolus and continuous intracoronary thermodilution measurements were obtained in duplicate in the left anterior descending artery (LAD). Patients were randomly assigned in a 1:1 ratio to undergo either bolus thermodilution first or continuous thermodilution first. RESULTS: (variability: 12.7±10.4% continuous vs 31.26±24.85% bolus; p<0.001). MRR showed a higher reproducibility than IMR (variability 12.4±10.1% continuous vs 24.2±19.3% bolus; p<0.001). No correlation was found between MRR and IMR (r=0.1, 95% confidence interval: -0.09 to 0.29; p=0.305). CONCLUSIONS: In the assessment of coronary microvascular function, continuous thermodilution demonstrated significantly less variability on repeated measurements than bolus thermodilution.
Gallinoro et al. (Thu,) conducted a rct in ANOCA. Continuous thermodilution vs. Bolus thermodilution was evaluated on Variability on repeated measurements (p=<0.001). Continuous thermodilution demonstrated significantly less variability on repeated measurements than bolus thermodilution in assessing coronary microvascular function (12.7% vs 31.26%; p<0.001).
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