Abstract
Background
Myocardial microvascular disease may occur during the disease course of different cardiac as well as systemic disorders. With the present study, we introduce a novel and easy-to-perform cardiovascular magnetic resonance (CMR) parameter named “myocardial transit-time” (MyoTT).
Methods
N = 20 patients with known hypertrophic cardiomyopathy (HCM) and N = 20 control patients without relevant cardiac disease underwent dedicated CMR studies on a 1.5-T MR scanner. The CMR protocol comprised cine and late-gadolinium-enhancement (LGE) imaging as well as first-pass perfusion acquisitions at rest for MyoTT measurement. MyoTT was defined as the blood circulation time from the orifice of the coronary arteries to the pooling in the coronary sinus (CS), and accordingly measured as the temporal difference between the appearances of CMR contrast agent in the aortic root and the CS reflecting the transit-time of gadolinium in the myocardial microvasculature.
Results
Patients with HCM had a significantly prolonged MyoTT compared to controls (11.0 (9.1–14.5) s vs. 6.5 (4.8–8.4) s, p < 0.001). This significant difference did not change when the individual heart rate was taken into consideration (MyoTT indexed, p < 0.001). Significant correlations were found between MyoTT and maximal left ventricular (LV) wall thickness (r = 0.771, p < 0.001), MyoTT and presence of LGE (r = 0.760, p < 0.001) as well as MyoTT and LV global longitudinal strain (r = 0.672, p < 0.001). ROC analysis resulted in an area-under-curve (AUC) of 0.90 for MyoTT and showed an optimal sensitivity/specificity cut-off of 7.85 s to differentiate HCM from controls.
Conclusion
“Myocardial transit-time” is a novel and easy-to-perform CMR parameter that allows a quick assessment of the extent of myocardial microvascular disease. This novel CMR parameter may open new vistas in the assessment of microvascular disease—not only in HCM patients. Future studies will show the usefulness and clinical relevance of this novel CMR parameter.
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Availability of data and materials
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- 1P:
-
First-pass perfusion
- BW:
-
Body weight
- CAD:
-
Coronary artery disease
- CMD:
-
Coronary microvascular dysfunction
- CMR:
-
Cardiovascular magnetic resonance
- CS:
-
Coronary sinus
- DCM:
-
Dilative cardiomyopathy
- IQR:
-
Interquartile range
- LGE:
-
Late-gadolinium-enhancement
- LV:
-
Left ventricle
- LV-EDV:
-
Left ventricular end-diastolic volume
- LV-EF:
-
Left ventricular ejection fraction
- MBF:
-
Myocardial blood flow
- MPR:
-
Myocardial perfusion reserve
- MyoTT:
-
Myocardial transit-time
- ROI:
-
Region of interest
- VENC:
-
Velocity encoding
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GC participated in the CMR exams, carried out the data and statistical analysis, and wrote the initial draft version of the manuscript. MB participated in the CMR exams, carried out the data and statistical analysis, and wrote some paragraphs of the initial draft version of the manuscript. AF, CM, and DC participated in the CMR exams and in the analysis of the CMR data. HR critically reviewed the manuscript. AY supervised the study, critically reviewed the manuscript and drafted the manuscript. All authors read and approved the final manuscript.
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The study protocol complies with the Declaration of Helsinki. Written informed consent was obtained from every patient.
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Chatzantonis, G., Bietenbeck, M., Florian, A. et al. “Myocardial transit-time” (MyoTT): a novel and easy-to-perform CMR parameter to assess microvascular disease. Clin Res Cardiol 109, 488–497 (2020). https://doi.org/10.1007/s00392-019-01530-x
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DOI: https://doi.org/10.1007/s00392-019-01530-x