Correlation between intra-abdominal and intracranial pressure in
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1 Electronic Supplemental Material: Correlation between intra-abdominal and intracranial pressure in nontraumatic brain injury Dries H. Deeren (1), Hilde Dits (2), Manu L. N. G. Malbrain (2) Department of Internal Medicine (1) and Intensive Care Unit (2), ZiekenhuisNetwerk Antwerpen, Campus Stuivenberg, Antwerp, Belgium Correspondence to: Dr. Manu Malbrain, Intensive Care Unit, ZiekenhuisNetwerk Antwerpen, Campus Stuivenberg, Lange Beeldekensstraat 267, B-26 Antwerp, Belgium; Tel.: ; Fax.: IAP vs ICP ESM Page 1
2 Figures F.S1 Scatterplots Scatterplot of the standardized residuals (Y axis) against the standardized predicted values (X axis) showing no discernible relationship and indicating linearity and equality of variances. Panel A for the regression between ICP and IAP (and subject). Panel B for the regression between CPP and IAP (and subject). Panel A Dependent Variable: ICP 3 Regression Standardized Residual Regression Standardized Predicted Value IAP vs ICP ESM Page 2
3 Panel B Dependent Variable: CPP 6 Regression Standardized Residual Regression Standardized Predicted Value IAP vs ICP ESM Page 3
4 F.S2 Normal P-P plots Normal P-P plot of the cumulative proportion for the regression standardized residual (X axis) plotted against the cumulative proportion expected if the sample were from a normal distribution (Y axis). The points cluster around a straight line, indicating that the sample is from a normal distribution. Panel A for the regression between ICP and IAP (and subject). Panel B for the regression between CPP and IAP (and subject). Panel A 1, Dependent Variable: ICP,8 Expected Cum Prob,6,4,2,,,2,4,6,8 1, Observed Cum Prob IAP vs ICP ESM Page 4
5 Panel B Dependent Variable: CPP 1,,8 Expected Cum Prob,6,4,2,,,2,4,6,8 1, Observed Cum Prob IAP vs ICP ESM Page 5
6 F.S3 Scattergrams (IAP: intraabdominal pressure, ICP: intracranial pressure, MAP: mean arterial pressure, APP: abdominal perfusion pressure, CPP: cerebral perfusion pressure) Panel A: IAP versus ICP (positive correlation) 25 Correlation IAP vs ICP 2 ICP (mmhg) R =.7, p< IAP (mmhg) Panel B: APP versus CPP (strong positive correlation), 175 Correlation APP vs CPP 15 CPP (mmhg) R =.99, p< APP (mmhg) Panel C: AIAP versus AICP (positive correlation), IAP vs ICP ESM Page 6
7 1 Correlation &IAP vs &ICP 5 &ICP (mmhg) -5 R =.69, p< &IAP (mmhg) Panel D: IAP versus CPP (negative correlation), 175 Correlation IAP vs CPP 15 CPP (mmhg) R = -.32, p< IAP (mmhg) IAP vs ICP ESM Page 7
8 Panel E: AIAP versus ACPP (weak but significant negative correlation) &CPP (mmhg) Correlation &IAP vs &CPP R = -.17, p< &IAP (mmhg) Panel F: AIAP versus AMAP (no correlation) &MAP (mmhg) Correlation &IAP vs &MAP R =.1, p=ns &IAP (mmhg) IAP vs ICP ESM Page 8
9 F.S4 Bland-Altman plot of AIAP and AICP (ULA: upper limit of agreement, LLA: lower limit of agreement, IAP: intraabdominal pressure, ICP: intracranial pressure) 1 IAP- ICP 5-5 ULA Bias LLA ( IAP+ ICP)/2 F.S5 Partial regression plot Partial regression plot of the residuals of IAP and the residuals of ICP in the regression between ICP and IAP (and subject) for the two subjects with a mean IAP < 5 mmhg (4.5 and 3.8 mmhg respectively; 44 measurements), demonstrating the significant regression between IAP and ICP within the range of observed values of IAP. IAP vs ICP ESM Page 9
10 Dependent Variable: ICP ICP (2 subjects with mean IAP < 5 mmhg) 7,5 5, 2,5, -2,5-5, IAP (2 subjects with mean IAP < 5 mmhg) IAP vs ICP ESM Page 1
11 F.S6 Scatterplots Panel A: scatterplot of IAP (mmhg) against ICP (mmhg) in the subject with the lowest mean IAP (3.8 mmhg; 36 measurements) demonstrating the significant, positive correlation. Panel B: scatterplot of IAP (mmhg) against CCP (mmhg) in the subject with the lowest mean IAP (3.8 mmhg; 36 measurements) demonstrating the significant, negative correlation. Panel A 14, ICP (subject with lowest mean IAP: 3.8 mmhg) 12, 1, 8, 6, 4, 2, 1, 2, 3, 4, 5, IAP (subject with lowest mean IAP: 3.8 mmhg) 6, IAP vs ICP ESM Page 11
12 F.S7 Bar graphs Bar graphs showing IAP and ICP (Panel A) and APP and CPP (Panel B) before (pre) and after (post) neuromuscular blockade (cisatracurium) bolus administration (IAP: intraabdominal pressure, ICP: intracranial pressure, APP: abdominal perfusion pressure, CPP: cerebral perfusion pressure) Panel A 25 2 ICP (mmhg) IAP (mmhg) Panel B Pre CPP (mmhg) APP (mmhg) Post Pre Post IAP vs ICP ESM Page 12
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