Table 1.
Patient characteristics and variable completeness in the Western Denmark Cardiac Computed Tomography Registry, 2008–2012
| Frequency of characteristics
|
Variable completeness, %
|
|||
|---|---|---|---|---|
| Cardiac CT cohort overall (n=21,623) |
Coronary CTA cohorta (n=18,899) |
Cardiac CT cohort overall | Coronary CTA cohorta | |
| Male sex | 10,169 (47.0) | 8,506 (45.0) | 100 | 100 |
| Age, yearsb | 58 (50–66) | 58 (50–66) | 100 | 100 |
| County | – | – | 97.1 | 97.6 |
| Area code | – | – | 97.1 | 97.6 |
| Referral date | – | – | 78.7 | 77.2 |
| Family history of premature CAD | 8,044 (37.2) | 7,353 (38.9) | 85.7 | 82.7 |
| Current lipid-lowering therapy | 6,589 (30.5) | 5,883 (31.1) | 85.6 | 85.5 |
| Current medical treatment for hypertension | 7,400 (34.2) | 6,532 (34.6) | 85.5 | 85.3 |
| Smoking status (current or former) | 10,648 (49.2) | 9,504 (50.3) | 85.9 | 85.8 |
| Diabetes | 1,208 (5.6) | 1,035 (5.5) | 85.9 | 85.4 |
| Previous PCI | 278 (1.3) | 166 (0.9) | 85.9 | 86.2 |
| Previous cardiac surgery | 354 (1.6) | 156 (0.8) | 85.9 | 87.0 |
| Previous myocardial infarction | 310 (1.4) | 193 (1.0) | 85.9 | 86.1 |
| Height (cm)b | 172 (165–178) | 171 (165–178) | 79.5 | 80.6 |
| Weight (kg)b | 78 (67–89) | 78 (67–88) | 79.8 | 80.9 |
| Creatinine level, μmol/Lb | 73 (64–84) | 73 (63–83) | 77.8 | 78.8 |
| Systolic blood pressure, mmHgb | 140 (126–151) | 140 (126–151) | 77.6 | 78.9 |
| Diastolic blood pressure, mmHgb | 81 (75–90) | 81 (75–90) | 77.5 | 78.8 |
| Left ventricular ejection fractionb | 60 (60–60) | 60 (60–60) | 58.2 | 59.7 |
| Type of CT scanner | – | – | 98.5 | 99.7 |
| Cardiac CT indication | – | – | 99.6 | 100 |
| Angina/equivalent | 18,899 (87.4) | – | – | – |
| Heart failure | 292 (1.4) | – | – | – |
| Visualization of valves and/or aorta disease | 239 (1.1) | – | – | – |
| Visualization of stents | 71 (0.3) | – | – | – |
| Evaluation of cardiac structures | 631 (2.9) | – | – | – |
| Others | 1,410 (6.5) | – | – | – |
| Unknown | 81 (0.4) | – | – | – |
| Angina type (if any) | – | – | 61.4 | 70.3 |
| Typical angina | – | 1,764 (9.4) | – | – |
| Atypical angina | – | 5,844 (30.9) | – | – |
| Unspecific chest pain | – | 4,760 (25.2) | – | – |
| Dyspnea | – | 916 (4.8) | – | – |
| Unknown | – | 5,615 (29.7) | – | – |
| Priority | – | – | 93.9 | 95.5 |
| Acute | 118 (0.5) | 78 (0.4) | – | – |
| Subacute | 860 (4.0) | 755 (4.0) | – | – |
| Elective | 19,317 (89.3) | 17,209 (91.1) | – | – |
| Unknown | 1,328 (6.2) | 857 (4.5) | – | – |
| Date of procedure | – | – | 100 | 100 |
| Kilo-electron voltb | 100 (100–120) | 100 (100–120) | 97.2 | 98.4 |
| Radiation dose | –c | –c | 93.8 | 94.8 |
| Iodine concentration, mg/mLb | 350 (350–370) | 350 (350–370) | 93.0 | 94.6 |
| Contrast volume, mLb | 80 (70–90) | 80 (70–90) | 92.9 | 94.5 |
| Preprocedural beta-blocker | 13,007 (60.2) | 11,991 (63.4) | 93.4 | 95.1 |
| Heart rhythm | – | – | 93.5 | 95.2 |
| Sinus rhythm | 19,855 (91.8) | 17,794 (94.2) | – | – |
| Atrial fibrillation | 266 (1.2) | 108 (0.6) | – | – |
| Other | 106 (0.5) | 85 (0.4) | – | – |
| Unknown | 1,396 (6.5) | 912 (4.8) | – | – |
| Heart rate, bpmb | 59 (54–65) | 59 (54–64) | 93.4 | 95.0 |
| Cardiac CT quality | – | – | 88.9 | 90.1 |
| Good | 16,120 (74.6) | 14,304 (75.7) | – | – |
| Moderate | 2,170 (10.0) | 1,897 (10.0) | – | – |
| Nonevaluable | 923 (4.3) | 828 (4.4) | – | – |
| Unknown | 2,410 (11.1) | 1,870 (9.9) | – | – |
| CACS (Agatston) resultb | 0 (0–95) | 0 (0–90) | 87.8 | 87.2 |
| Coronary CTA result | – | – | 95.4 | 96.2 |
| Normal | 13,901 (64.3) | 12,550 (66.4) | – | – |
| Nonobstructive CAD | 2,573 (11.9) | 2,213 (11.7) | – | – |
| 1-vessel obstructive CAD | 2,176 (10.1) | 2,012 (10.6) | – | – |
| 2-vessel obstructive CAD | 739 (3.4) | 673 (3.6) | – | – |
| 3-vessel/LM obstructive CAD | 462 (2.1) | 312 (1.7) | – | – |
| Only CACS performed | 778 (3.6) | 427 (2.3) | – | – |
| Unknown | 994 (4.6) | 712 (3.7) | – | – |
| Consequence of cardiac CT results | – | – | 86.2 | 86.7 |
| Nothing further | 9,966 (46.1) | 8,673 (45.9) | – | – |
| Medical treatment | 3,820 (17.7) | 3,313 (17.5) | – | – |
| Referral to invasive coronary angiography | 3,520 (16.3) | 3,216 (17.0) | – | – |
| Referral to myocardial perfusion imaging | 679 (3.1) | 632 (3.3) | – | – |
| CACS is too high – referral to further testing | 199 (0.9) | 157 (0.8) | – | – |
| Referral to other noninvasive diagnostic testing | 461 (2.1) | 399 (2.1) | – | – |
| Unknown | 2,977 (13.8) | 2,509 (13.4) | – | – |
Notes:
a
Patients with angina suspicious symptoms;
b
values in median ± interquartile range;
c
was not estimated due to differences in registered dose units.
Abbreviations: CACS, coronary artery calcium scoring; CAD, coronary artery disease; CT, computed tomography; CTA, computed tomography angiography; LM, left main; PCI, percutaneous coronary intervention.