Primary Coronary Microvascular Dysfunction

Q: What is the clinical evidence from this study?

Study design: Review. Population: Coronary Microvascular Dysfunction. Intervention: Invasive physiological assessment indices (e.g., CFR, IMR, HMR).

Gaetano Antonio Lanza; Filippo Crea

doi:10.1161/circulationaha.109.900191

June 1, 2010Circulation

Primary Coronary Microvascular Dysfunction

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Key result

Invasive microcirculatory assessment provides complementary diagnostic and prognostic value in coronary microvascular dysfunction.

Key Points

To review the pathophysiological mechanisms of coronary microvascular dysfunction and evaluate wire-based invasive physiological assessment modalities used in clinical practice.
Synthesized physiological concepts underlying functional and structural microvascular impairment in vessels smaller than 500 μm in diameter.
Evaluated diagnostic performance and procedural characteristics of wire-based techniques, including Doppler flow velocity and bolus or continuous thermodilution.
Coronary microcirculation accounts for more than 70% of total coronary vascular resistance, requiring up to a five-fold flow augmentation during hyperemia via microvascular resistance reduction.
Doppler-tipped guidewires enable simultaneous measurement of average peak flow velocity and distal coronary pressure to derive hyperemic microvascular resistance, but clinical use is constrained by technical alignment challenges.
Thermodilution using mean transit time is widely adopted and standardized via the CATHCMD algorithm, although it remains an indirect surrogate with moderate correlation to Doppler and PET metrics.

PICO

P

Population

Coronary Microvascular Dysfunction

I

Intervention / Comparator

Invasive physiological assessment indices (e.g., CFR, IMR, HMR)

Limitations

Lack of standardized diagnostic cut-off values across different clinical contexts and measurement modalities
Technical complexity and requirement for specialized armamentarium (e.g., Doppler wires, dedicated infusion microcatheters) limit widespread clinical adoption
Measurement accuracy of some indices can be affected by the presence of significant epicardial stenosis, collateral flow, and systemic hemodynamic fluctuations

Implication

This review comprehensively summarizes the theoretical framework, technical aspects, and clinical utility of invasive physiological indices for evaluating coronary microvascular dysfunction.

Abstract

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Discussion

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Cite This Study

Lanza et al. (2010) conducted a review in Coronary Microvascular Dysfunction. Invasive physiological assessment indices (e.g., CFR, IMR, HMR) was evaluated. Invasive physiological assessment of the coronary microcirculation provides complementary diagnostic and prognostic information to characterize coronary microvascular dysfunction.

synapsesocial.com/papers/6acf69e13316c606f341fa18 https://doi.org/10.1161/circulationaha.109.900191

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Primary Coronary Microvascular Dysfunction

Key Points

PICO

Limitations

Implication

Abstract

Discussion

Cite This Study

Primary Coronary Microvascular Dysfunction

Key Points

PICO

Limitations

Implication

Abstract

Discussion

Cite This Study

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