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Table 2 Hemodynamic variables in responders (n = 13) and nonresponders (n = 17) during the study

From: Changes in stroke volume induced by lung recruitment maneuver can predict fluid responsiveness during intraoperative lung-protective ventilation in prone position

Variables

T0

T1

T2

T3

T4

P Value

T0 versus T1

P Value

T1 versus T2

P Value

T3 versus T4

HR (bpm)

 Responders

69 ± 12

68 ± 13

67 ± 13

69 ± 15

68 ± 14

0.428

0.732

0.231

 Nonresponders

67 ± 10

66 ± 10

63 ± 10

66 ± 10

66 ± 9

0.496

0.010*

0.744

MAP (mmHg)

 Responders

77 ± 13

77 ± 12

58 ± 13

74 ± 12

80 ± 12

0.801

<  0.001*

0.031*

 Nonresponders

78 ± 9

78 ± 9

66 ± 13

78 ± 8

78 ± 8

0.231

<  0.001*

0.859

Stroke volume (mL)

 Responders

62 ± 14

59 ± 14

26 ± 21

56 ± 14

67 ± 15

0.002*

<  0.001*

<  0.001*

 Nonresponders

59 ± 11

58 ± 11

39 ± 17

58 ± 11

60 ± 11

0.009*

<  0.001*

0.002*

SVV (%)

  Responders

10 ± 3

12 ± 4

 

12 ± 4

10 ± 2

0.005*

 

0.047*

  Nonresponders

12 ± 4

13 ± 6

 

13 ± 5

12 ± 5

0.046*

 

0.067

PPV (%)

  Responders

9 ± 3

10 ± 4

 

10 ± 5

9 ± 3

0.015*

 

0.057

  Nonresponders

10 ± 6

11 ± 6

 

11 ± 5

9 ± 5

0.037*

 

0.008*

  1. Statistical analysis Paired t-test. Data are expressed as mean ± SD. * statistically significant p < 0.05
  2. Abbreviations: BP Blood pressure, HR Heart rate, MAP Mean arterial blood pressure, SVV Stroke volume variation, PPV Pulse Pressure variation, T0, just before changing position from supine to prone; T1, before recruitment maneuver in prone position; T2, at the end of recruitment maneuver; T3, 5 min after recruitment maneuver / baseline before volume expansion; T4, after volume expansion