TY - JOUR
T1 - Significance of PQ interval in acquisition of coronary multidetector row computed tomography
AU - Sano, Tomonari
AU - Kondo, Takeshi
AU - Matsutani, Hideyuki
AU - Morita, Hitomi
AU - Arai, Takehiro
AU - Sekine, Takako
AU - Takase, Shinichi
AU - Oida, Akitsugu
AU - Fukazawa, Hiroshi
AU - Kodama, Takahide
AU - Kondo, Makoto
AU - Orihara, Tadaaki
AU - Yamada, Norikazu
AU - Narula, Jagat
PY - 2009/12
Y1 - 2009/12
N2 - Background: Since image quality obtained in the mid-diastolic [or slow filling (SF)] phase is generally superior to end-systolic image in coronary multidetector row computed tomography (MDCT), low heart rate (HR) comprises the most important factor for acquisition of high-quality images. However, despite HR 200 ms) were evaluated. RR and PQ were measured on electrocardiogram and systolic and SF phase with 4-chamber cine cardiac computed tomography. SF significantly (p <0.0001) correlated with RR (SF = -471 + 0.720RR, r = 0.887) in all subjects. The SF of without 1°AVB (292 ± 97 ms) was significantly (p <0.0147) longer than that of with 1°AVB (251 ± 121 ms), although RR was not significantly different between the two groups. The SF/RR of without 1°AVB (27.2 ± 6.1%) was also significantly (p <0.0001) higher than that of with 1°AVB (22.7 ± 8.0%). The coefficient of correlation between (RR - PQ) and SF [r = 0.915, p <0.0001, SF = -362 + 0.742(RR - PQ)] was significantly (p <0.034) higher than that of correlation between RR and SF in all subjects. The SF of rank A image quality was significantly longer than that of rank B (p <0.0001) or rank C (p = 0.0042). In critical HR (60-69 bpm), the optimum phase was ES in 7/139 patients without 1°AVB, and SF in 3/13 patients with 1°AVB (χ2, p <0.0416). Conclusion: Since SF depends on (RR - PQ), if PQ is long in critical HR, it might be difficult to reconstruct high quality images in the SF phase.
AB - Background: Since image quality obtained in the mid-diastolic [or slow filling (SF)] phase is generally superior to end-systolic image in coronary multidetector row computed tomography (MDCT), low heart rate (HR) comprises the most important factor for acquisition of high-quality images. However, despite HR 200 ms) were evaluated. RR and PQ were measured on electrocardiogram and systolic and SF phase with 4-chamber cine cardiac computed tomography. SF significantly (p <0.0001) correlated with RR (SF = -471 + 0.720RR, r = 0.887) in all subjects. The SF of without 1°AVB (292 ± 97 ms) was significantly (p <0.0147) longer than that of with 1°AVB (251 ± 121 ms), although RR was not significantly different between the two groups. The SF/RR of without 1°AVB (27.2 ± 6.1%) was also significantly (p <0.0001) higher than that of with 1°AVB (22.7 ± 8.0%). The coefficient of correlation between (RR - PQ) and SF [r = 0.915, p <0.0001, SF = -362 + 0.742(RR - PQ)] was significantly (p <0.034) higher than that of correlation between RR and SF in all subjects. The SF of rank A image quality was significantly longer than that of rank B (p <0.0001) or rank C (p = 0.0042). In critical HR (60-69 bpm), the optimum phase was ES in 7/139 patients without 1°AVB, and SF in 3/13 patients with 1°AVB (χ2, p <0.0416). Conclusion: Since SF depends on (RR - PQ), if PQ is long in critical HR, it might be difficult to reconstruct high quality images in the SF phase.
KW - Coronary artery
KW - Heart rate
KW - Image quality
KW - Multidetector row computed tomography
KW - PQ interval
KW - Slow filling (mid-diastolic) phase reconstruction
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U2 - 10.1016/j.jjcc.2009.07.004
DO - 10.1016/j.jjcc.2009.07.004
M3 - Article
C2 - 19944320
AN - SCOPUS:70450223345
VL - 54
SP - 441
EP - 451
JO - Journal of cardiography. Supplement
JF - Journal of cardiography. Supplement
SN - 0914-5087
IS - 3
ER -