Table 4.
Echocardiography data before and during 60º head-up tilt
| Group | Baseline | HUT1 | HUT15 | |
|---|---|---|---|---|
| SV, mL/beat | Healthy | 67.9 (54.1–85.8) | 66.7 (52.2–87.0) | 56.7 (50.1–79.3) |
| Before | 75.3 (68.5–79.5) | 60.2 (40.3–62.8)† | 54.0 (47.3–58.2)† | |
| After | 67.9 (51.8–72.5) | 48.1 (33.1–53.9) | 50.2 (39.2–52.4) | |
| CO, L/min | Healthy | 4.4 (3.2–6.5) | 4.3 (3.6–7.1) | 4.2 (3.4–6.4) |
| Before | 4.6 (3.9–5.3) | 3.4 (2.7–4.3)† | 3.6† (3.2–4.0) | |
| After | 4.0 (3.6–4.8) | 3.2 (2.7–4.4) | 3.6 (3.3–3.9) | |
| TPR, a.u | Healthy | 19.8 (13.0–32.5) | 19.6 (12.4–30.3) | 22.9 (14.7–28.7) |
| Before | 19.9 (17.7–25.2) | 25.5 (21.3–36.5)† | 24.8 (22.7–28.6) | |
| After | 20.6 (17.9–25.1) | 25.1 (20.2–29.2) | 22.5 (19.6–23.9) | |
| EF, % | Healthy | 67.7 (66.6–72.3) | 71.4 (67.2–75.5) | 69.0 (66.7–72.8) |
| Before | 62.2 (57.8–66.3)* | 61.2 (57.0–65.8)* | 59.2 (44.7–62.4)$ | |
| After | 60.6 (48.6–61.8)** | 54.2 (50.5–62.3)** | 50.4 (47.9–55.8)** | |
| LVESV, mL | Healthy | 29 (26–33) | 23 (22–28) | 25 (24–27)† |
| Before | 45 (40–56)* | 32 (30–44)† | 35 (32–45)*† | |
| After | 45 (39–59)** | 36 (29–40)**† | 41 (32–48)**† | |
| LVEDV, mL | Healthy | 97 (82–122) | 97 (71–113) | 84 (74–105) |
| Before | 120 (112–133) | 93 (77–102)† | 94 (86–113)† | |
| After | 117 (100–127) | 84 (65–102)† | 91 (76–102)† |
Values are medians (1st–3rd quartiles) of 8 patients before (Before) and after CABG (After) and 7 in the healthy subjects (Healthy). Baseline, at rest in supine position before head-up tilt (HUT); HUT1-15
SV stroke volume, CO cardiac output, TPR total peripheral resistance in arbitrary units (a.u.); EF left ventricular ejection fraction, LVESV left ventricular end-systolic volume, LVEDV left ventricular end-diastolic volume
* vs. “Healthy”; ** vs. “Before”; †vs. “Baseline” within the same group of subjects; $vs. HUT1 at the level of P < 0.05