Effect of coronary artery bypass grafting on blood pressure response to head-up tilting

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

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