Significance of PQ interval in acquisition of coronary multidetector row computed tomography

Tomonari Sano, Takeshi Kondo, Hideyuki Matsutani, Hitomi Morita, Takehiro Arai, Takako Sekine, Shinichi Takase, Akitsugu Oida, Hiroshi Fukazawa, Takahide Kodama, Makoto Kondo, Tadaaki Orihara, Norikazu Yamada, Jagat Narula

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)441-451
Number of pages11
JournalJournal of Cardiology
Volume54
Issue number3
DOIs
Publication statusPublished - Dec 2009

Keywords

  • Coronary artery
  • Heart rate
  • Image quality
  • Multidetector row computed tomography
  • PQ interval
  • Slow filling (mid-diastolic) phase reconstruction

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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