JACC: Cardiovascular Imaging
Original Research
High-Pitch Thoracic CT With Simultaneous Assessment of Coronary ArteriesEffect of Heart Rate and Heart Rate Variability on Image Quality and Diagnostic Accuracy
Michael Scharf, Ricarda Bink, Matthias S. May, Christian Hentschke, Stephan Achenbach, Michael Uder and Michael M. Lell
Table 3
Table 3
Image Quality per Segment and per Patient in Groups Separated by HR and HRV
| Finding | Low HR, Low HRV | Low HR, High HRV | High HR, Low HRV | High HR, High HRV |
|---|---|---|---|---|
| Heart rate parameter | ||||
| Mean ± SD HR (beats/min) | 55 ± 5 | 56 ± 7 | 84 ± 13 | 87 ± 16 |
| Mean ± SD HRV (beats/min) | 8.5 ± 1.9 | 34.1 ± 23.4 | 8.2 ± 2.6 | 22.6 ± 22.5 |
| Image quality per segment | ||||
| Excellent (score 1) | 73.9 (257/348) | 38.3 (59/154) | 14.9 (73/490) | 13.8 (103/748) |
| Moderate (score 2) | 26.1 (91/348) | 27.3 (42/154) | 17.5 (86/490) | 16.1 (120/748) |
| Poor (score 3) | — | 34.4 (53/154) | 67.6 (331/490) | 70.1 (525/748) |
| Image quality per patient | ||||
| All segments have diagnostic image quality | 100 (23/23) | 27.3 (3/11) | 3.2 (1/31) | 4.3 (2/46) |
| Not all segments have diagnostic image quality | — | 72.7 (8/11) | 96.8 (30/31) | 95.7 (44/46) |
Values for image quality per segment and per patient are indicated as percentages and numbers (n/N). Low heart rate (HR) is defined as <64 beats/min, low heart rate variability (HRV) as <13 beats/min, HR as ≥64 beats/min, and high HRV as ≥13 beats/min. HRV is defined as the difference between minimal and maximal HR during examination.
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