Skip to main content

Table 2 Characteristics of the 134 patients analysed in this study

From: Myocardial CT perfusion imaging for the detection of obstructive coronary artery disease: multisegment reconstruction does not improve diagnostic performance

Characteristic

All patients (n = 134)

Diagnostic performance comparison and radiation dose index group (n = 93)c

Radiation dose control group (n = 41)c

p-value

Age (years)a

65.7 (55.9–70.2)

62.9 (54.5–70.0)

67.1 (64.4–70.1)

0.013

Men

73 (98)

69 (64)

83 (34)

0.090

Body mass indexa, b

26.8 (25.2–30.0)

27.0 (25.4–30.4)

26.3 (24.7–29.3)

0.163

Dyslipidaemia

69 (93)

69 (64)

71 (29)

0.825

Arterial hypertension

80 (107)

81 (75)

78 (32)

0.730

Diabetes mellitus

27 (36)

24 (22)

34 (14)

0.207

Clinical presentation

 Typical angina

24 (32)

22 (20)

29 (12)

0.331

 Atypical angina

27 (36)

25 (23)

32 (13)

0.401

 Nonspecific chest pain

20 (27)

22 (20)

17 (7)

0.556

 No chest pain

29 (39)

32 (30)

22 (9)

0.226

Positive stress test

 Electrocardiography

7 (9)

6 (6)

7 (3)

0.494

 Echocardiography

14 (19)

11 (10)

22 (9)

0.087

 Magnetic resonance perfusion imaging

17 (23)

16 (15)

20 (8)

0.632

 Single-photon emission computed tomography

36 (48)

39 (36)

29 (12)

0.294

Pretest CAD status

 Prevalence of CAD

    

  Suspected or no obstructive disease

29 (39)

27 (25)

34 (14)

0.394

  One-vessel disease

31 (42)

31 (29)

32 (13)

0.952

  Two-vessel disease

22 (29)

24 (22)

17 (7)

0.394

  Three-vessel disease

16 (22)

16 (15)

17 (7)

0.892

  Four-vessel disease

1 (2)

2 (2)

0 (0)

0.999

Stress CTP parameters

 Contrast medium dose (ml) a

60 (60–70)

60 (60–70)

60 (60–70)

0.130

 Heart rate (bpm) a

66.4 (61.5–74.5)

70.7 (64.9–76.4)

58.0 (53.3–64.1)

0.001

 2-segment MSR

63 (84)

90 (84)

0 (0)

< 0.001

 3-segment MSR

7 (9)

10 (9)

0 (0)

0.057

 Per-segment temporal reconstruction window (ms) a

129.7 (102.8–175.0)

115.3 (96.8–132.5)

175 (175–175)

< 0.001

  1. Data are percentages with numbers of patients in parentheses, unless otherwise stated. aData are medians with interquartile ranges in parentheses (data not normally distributed). bCalculated as \( \frac{\mathrm{weight}\ \mathrm{in}\ \mathrm{kg}}{{\left(\mathrm{height}\ \mathrm{in}\ \mathrm{m}\right)}^2} \). cSince a heart rate ≥ 65 bpm was the predefined cutoff for multisegment acquisition in the primary studies, the population for comparing the diagnostic performance of MSR and HSR of myocardial CTP consisted of 93 of 134 patients with multisegment acquisition of stress CTP allowing both MSR and HSR. The remaining 41 of 134 patients had single-segment acquisition due to heart rates < 65 bpm, and only HSR was possible. These patients served as a control group for interindividual radiation dose comparison (Fig. 1). bpm Beats per minute, CAD Coronary artery disease, CTP Computed tomography perfusion, HSR Halfscan reconstruction, MSR Multisegment reconstruction