title: Technical note: Electrocardiogram electrode repositioning for 320-row coronary CT angiography in patients with regular and recurrent premature ventricular contractions.
abstract: Arrhythmias can compromise image quality and increase radiation exposure during coronary CT angiography (CTA). However, premature ventricular contractions (PVCs) can occur in a predictable recurrent and regular pattern (ie, bigeminy, trigeminy, quadrigeminy) with post-PVC compensatory pauses. Electrocardiographic (ECG) electrode repositioning can achieve relative amplification of the R waves of PVCs compared with R waves of sinus beats. This technical note describes how simple ECG electrode repositioning, combined with an absolute-delay strategy, facilitated selective R waves of PVC ECG triggering of image acquisition in 6 patients with PVC bigeminy or quadrigeminy at the time of 320-row coronary CTA. All 6 studies were single heartbeat acquisition scans with excellent image quality and a median effective radiation dose of 2.9 mSv (interquartile range, 2.1-3.8 mSv). Standard ECG electrode positions used for 2 patients with PVC bigeminy undergoing coronary CTA were associated with an acquisition over 2 heartbeats and effective radiation doses of 6.8 and 10.3 mSv, respectively. In conclusion, ECG electrode repositioning combined with an absolute-delay strategy for regularly recurring PVCs, such as ventricular bigeminy, facilitates high image quality and lower radiation dose during coronary CTA. This simple and straightforward technique can be considered for all patients with regular and recurrent PVCs undergoing coronary CTA.
authors.affiliation: Department of Cardiology, Takase Clinic, 885-2 Minami-orui, Takasaki 370-0036, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kondo
authors.affiliation: Department of Radiological Technology, Takase Clinic, 885-2 Minami-orui, Takasaki 370-0036, Japan.
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Matsutani
authors.affiliation: Applied Imaging Science Laboratory, Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
authors.forename: John
authors.initials: J
authors.lastname: Groarke
authors.affiliation: Department of Cardiology, Takase Clinic, 885-2 Minami-orui, Takasaki 370-0036, Japan.
authors.forename: Kazuhisa
authors.initials: K
authors.lastname: Takamura
authors.affiliation: Department of Cardiology, Takase Clinic, 885-2 Minami-orui, Takasaki 370-0036, Japan.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Fujimoto
authors.affiliation: Applied Imaging Science Laboratory, Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA.
authors.forename: Frank J
authors.initials: FJ
authors.lastname: Rybicki
authors.affiliation: Applied Imaging Science Laboratory, Department of Radiology, Brigham and Women's Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115, USA. Electronic address: kkumamaru@partners.org.
authors.forename: Kanako K
authors.initials: KK
authors.lastname: Kumamaru
mesh_terms: D000368:Aged; D055424:Cardiac-Gated Imaging Techniques / Q000295:instrumentation / Q000379:methods*; D017023:Coronary Angiography / Q000379:methods*; D003324:Coronary Artery Disease / Q000150:complications / Q000000981:diagnostic imaging*; D004562:Electrocardiography / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011856:Radiographic Image Enhancement / Q000295:instrumentation / Q000379:methods*; D012008:Recurrence; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*; D018879:Ventricular Premature Complexes / Q000150:complications / Q000175:diagnosis*
keywords: 320-row multidetector computed tomography; Computed tomography coronary angiography; Coronary artery; ECG electrode; Premature ventricular contractions; Radiation exposure