Abstract
Background
To detect ischemia in patients with angina and normal coronaries frequently represents a complex diagnosis.
Methods
To investigate whether left ventricular mechanical dyssynchrony by phase analysis contributes in the evaluation of patients with chest pain and normal coronaries, gated-SPECT myocardial perfusion imaging (MPI) at rest and 30 minutes post-stress was performed in 218 patients with normal epicardial coronaries, who were divided into two groups: those with summed difference score (SDS) ≥ 4 (54 patients, Group 1), and those with SDS < 4 (164 patients, Group 2). Intraventricular synchronism-phase standard deviation (PSD) and histogram bandwidth (HBW)—was evaluated by phase analysis.
Results
Women were significantly more frequent in Group 2 (those without ischemia in SPECT MPI): 113 (69%) vs 25 (46%), P = .00001. In males, left ventricular ejection fraction (LVEF) and ventricular volumes were not significantly different between patients with or without ischemia. However, ischemic females showed significantly higher ventricular volumes, minor post-stress LVEF and more negative delta LVEF (− 3.9 vs 0.34, P = .0008) than the non-ischemic ones. There was a significant post-stress increase of PSD and HBW among males, although not among females. According to SSS (≥ 4, with ischemia/necrosis; < 4, without ischemia/necrosis), post-stress PSD and HBW significantly increase both in male and female, and PSD and HBW were significantly higher in females with SSS ≥ 4 compared to those with SSS < 4 (PSD rest: 19.04° vs 11.72°, P < .0001; HBW rest: 58.85° vs 38.21°, P < .0001). PSD and HBW were also higher among males with SSS ≥ 4 compared to those with SSS < 4, although not significantly.
Conclusion
Higher ventricular volumes in females and dyssynchrony are associated with inducible ischemia in MPI in patients with chest pain and normal coronaries. Stress-induced ischemia increases degree of dyssynchrony.
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Abbreviations
- CAD:
-
Coronary artery disease
- ESV:
-
End-systolic volume
- EDV:
-
End-diastolic volume
- HBW:
-
Histogram bandwidth
- LVEF:
-
Left ventricular ejection fraction
- MPI:
-
Myocardial perfusion imaging
- PSD:
-
Phase standard deviation
- SDS:
-
Summed difference score
- SRS:
-
Summed rest score
- SSS:
-
Summed stress score
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We are grateful to Adrienne Hunter, Ph.D., for her dedication in reviewing the manuscript.
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Peix, A., Padrón, K., Cabrera, L.O. et al. Left ventricular mechanical dyssynchrony in patients with chest pain and normal epicardial coronary arteries. J. Nucl. Cardiol. 28, 1055–1063 (2021). https://doi.org/10.1007/s12350-019-01804-x
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DOI: https://doi.org/10.1007/s12350-019-01804-x