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Bahlmann, Hans
Publications (5 of 5) Show all publications
Bahlmann, H. (2019). Goal-directed fluid therapy during major abdominal surgery. (Doctoral dissertation). Linköping: Linköping University Electronic Press
Open this publication in new window or tab >>Goal-directed fluid therapy during major abdominal surgery
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Background: Both hypo- and hypervolemia increase the risk for postoperative complications after major abdominal surgery. Fluid needs vary amongst patients depending on differences in preoperative dehydration, intraoperative physiology and surgical characteristics. Goal-directed fluid therapy (GDFT) aims to target the right amount of fluid administration in each patient by evaluating the effect of fluid boluses on haemodynamic parameters such as stroke volume. It has been shown to reduce postoperative morbidity and is generally recommended for high-risk surgery. The overall aim of this thesis was to evaluate whether more simple devices for GDFT result in clinical benefit, thus facilitating the application of GDFT in more patients.

Aim: To compare performance and clinical benefit of pleth variability index (PVI), a noninvasive, easy-to-use device for GDFT, with the reference method of oesophageal Doppler; to evaluate methods for measuring preoperative dehydration and its effect on fluid handling by the body; and to confirm the expected clinical benefits of GDFT in patients undergoing oesophageal resection, a high risk procedure.

Methods: In Studies I-III 150 patients scheduled for open abdominal surgery of at least 2 hrs were randomised to GDFT with either PVI or oesophageal Doppler. In the first half of the cohort, both monitors were connected to compare intraoperative performance. In 30 patients preoperative dehydration was analysed. In study IV 64 patients undergoing oesophageal resection were randomised to GDFT using pulse contour analysis or standard treatment.

Results: The concordance between PVI and oesophageal Doppler for indicating the need for and effect of a fluid bolus was low, and both had only limited capacity to predict the effect of a fluid bolus. Both methods resulted in comparable amounts of fluid being administered and similar clinical outcome. Preoperative dehydration was limited but did impact on fluid handling. Patients receiving GDFT during oesophageal resection received more fluid and more dobutamine compared to controls, but this did not result in any clinical benefit.

Conclusions: There are methodological issues as well as uncertainties about the clinical benefit of GDFT. We cannot recommend a strict application of any GDFT strategy, but suggest that its components should be incorporated in a more encompassing assessment of a patient’s fluid needs. The measurement, impact and treatment of preoperative dehydration need to be further clarified.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2019. p. 83
Linköping University Medical Dissertations, ISSN 0345-0082 ; 1665
National Category
Anesthesiology and Intensive Care
urn:nbn:se:liu:diva-156263 (URN)10.3384/diss.diva-156263 (DOI)9789176851234 (ISBN)
Public defence
2019-05-10, Granitsalen, Universitetssjukhuset, Linköping, 13:00 (English)
Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-10Bibliographically approved
Bahlmann, H., Halldestam, I. & Nilsson, L. (2019). Goal-directed therapy during transthoracic oesophageal resection does not improve outcome: Randomised controlled trial. European Journal of Anaesthesiology, 36(2), 153-161
Open this publication in new window or tab >>Goal-directed therapy during transthoracic oesophageal resection does not improve outcome: Randomised controlled trial
2019 (English)In: European Journal of Anaesthesiology, ISSN 0265-0215, E-ISSN 1365-2346, Vol. 36, no 2, p. 153-161Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Goal-directed therapy (GDT) is expected to be of highest benefit in high-risk surgery. Therefore, GDT is recommended during oesophageal resection, which carries a high risk of postoperative complications.

OBJECTIVES: The aim of this study was to confirm the hypothesis that GDT during oesophageal resection improves outcome compared with standard care.

DESIGN: A randomised controlled study.

SETTING: Two Swedish university hospitals, between October 2011 and October 2015.

PATIENTS: Sixty-four patients scheduled for elective transthoracic oesophageal resection were randomised. Exclusion criteria included colonic interposition and significant aortic or mitral valve insufficiency.

INTERVENTION: A three-step GDT protocol included stroke volume optimisation using colloid boluses as assessed by pulse-contour analysis, dobutamine infusion if cardiac index was below 2.5 l min m and norepinephrine infusion if mean arterial blood pressure was below 65 mmHg.

MAIN OUTCOME MEASURE: The incidence of complications per patient at 5 and 30 days postoperatively as assessed using a predefined list.

RESULTS: Fifty-nine patients were available for analysis. Patients in the intervention group received more colloid fluid (2190 ± 875 vs. 1596 ± 759 ml, P < 0.01) and dobutamine more frequently (27/30 vs. 9/29, P < 0.01). The median [interquartile range, IQR] incidence of complications per patient 5 days after surgery was 2 [0 to 3] in the intervention group and 1 [0 to 2] in the control group (P = 0.10), and after 30 days 4 [2 to 6] in the intervention group and 2 [1 to 4] in the control group (P = 0.10).

CONCLUSION: Goal-directed therapy during oesophageal resection did not result in a reduction of the incidence of postoperative complications.

TRIAL REGISTRATION: identifier: NCT01416077.

Place, publisher, year, edition, pages
Lippincott Williams & Wilkins, 2019
National Category
Anesthesiology and Intensive Care
urn:nbn:se:liu:diva-156264 (URN)10.1097/EJA.0000000000000908 (DOI)000462763800010 ()30431499 (PubMedID)2-s2.0-85059795456 (Scopus ID)

Funding agencies: Linkoping Medical Society

Available from: 2019-04-10 Created: 2019-04-10 Last updated: 2019-04-18Bibliographically approved
Bahlmann, H. (2017). Stewarts blodgastolkning ger djupare insikt i syra–basrubbning [Letter to the editor]. Läkartidningen, 114
Open this publication in new window or tab >>Stewarts blodgastolkning ger djupare insikt i syra–basrubbning
2017 (English)In: Läkartidningen, ISSN 0023-7205, E-ISSN 1652-7518, Vol. 114Article in journal, Letter (Refereed) Published
Place, publisher, year, edition, pages
Stockholm, Sweden: Läkartidningen Förlag AB, 2017
National Category
Clinical Medicine
urn:nbn:se:liu:diva-145571 (URN)28375525 (PubMedID)
Available from: 2018-03-25 Created: 2018-03-25 Last updated: 2019-01-11Bibliographically approved
Bahlmann, H., Hahn, R. G. & Nilsson, L. (2016). Agreement between Pleth Variability Index and oesophageal Doppler to predict fluid responsiveness. Acta Anaesthesiologica Scandinavica, 60(2), 183-192
Open this publication in new window or tab >>Agreement between Pleth Variability Index and oesophageal Doppler to predict fluid responsiveness
2016 (English)In: Acta Anaesthesiologica Scandinavica, ISSN 0001-5172, E-ISSN 1399-6576, Vol. 60, no 2, p. 183-192Article in journal (Refereed) Published
Abstract [en]

Background: Optimisation of stroke volume using oesophageal Doppler is an established technique to guide intraoperative fluid therapy. The method has practical limitations and therefore alternative indices of fluid responsiveness, such as ventilator-induced variation in the pulse oximetric signal (Pleth Variability Index (PVI)) could be considered. We hypothesised that both methods predict fluid responsiveness in a similar way. Methods: Seventy-five patients scheduled for open major abdominal surgery were randomised to fluid optimisation using fluid bolus algorithms based on either PVI (n = 35) or Doppler (n = 39). All patients were monitored with both methods; the non-guiding method was blind. Primary endpoint was the concordance between the methods to predict fluid responsiveness. We also analysed the ability of each method to predict a stroke volume increase &gt;= 10% after a fluid bolus, as well as the accumulated intraoperative bolus fluid volume. Results: PVI indicated a need for fluid in one-third of the situations when Doppler did so, Cohens kappa = 0.03. A fluid bolus indicated by the PVI algorithm increased stroke volume by &gt;= 10% in half the situations. The same was found for the Doppler algorithm. The mean total bolus volume given was 878 ml when the fluid management was governed by PVI compared to 826 ml with Doppler (P = 0.71). Conclusion: PVI-and Doppler-based stroke volume optimisations agreed poorly, which did not affect the amount of fluid administered. None of the algorithms showed a good ability to predict fluid responsiveness. Our results do not support the fluid responsiveness concept.

Place, publisher, year, edition, pages
National Category
Health Sciences
urn:nbn:se:liu:diva-124622 (URN)10.1111/aas.12632 (DOI)000368139700006 ()26373826 (PubMedID)

Funding Agencies|Department of Anaesthesiology and Intensive Care, Linkoping University Hospital; County Council of Ostergotland

Available from: 2016-02-09 Created: 2016-02-08 Last updated: 2019-04-10
Hahn, R., Bahlmann, H. & Nilsson, L. (2014). Dehydration and fluid volume kinetics before major open abdominal surgery. Acta Anaesthesiologica Scandinavica, 58(10), 1258-1266
Open this publication in new window or tab >>Dehydration and fluid volume kinetics before major open abdominal surgery
2014 (English)In: Acta Anaesthesiologica Scandinavica, ISSN 0001-5172, E-ISSN 1399-6576, Vol. 58, no 10, p. 1258-1266Article in journal (Refereed) Published
Abstract [en]

Introduction: Assessment of dehydration in the preoperative setting is of potential clinical value. The present study uses urine analysis and plasma volume kinetics, which have both been validated against induced changes in body water in volunteers, to study the incidence and severity of dehydration before open abdominal surgery begins. Methods: Thirty patients (mean age 64 years) had their urine analysed before major elective open abdominal surgery for colour, specific weight, osmolality and creatinine. The results were scored and the mean taken to represent a dehydration index. Thereafter, the patients received an infusion of 5ml/kg of Ringers acetate intravenously for over 15min. Blood was sampled for 70min and the blood haemoglobin concentration used to estimate the plasma volume kinetics. Results: Distribution of fluid occurred more slowly (Pless than0.01) and the elimination half-life was twice as long (median 40min, not significant) in the 11 patients (37%) diagnosed to be moderately dehydrated as compared with euhydrated patients. The dehydration index indicated that the fluid deficit in these patients corresponded to 2.5% of the body weight, whereas the deficit in the others was 1%. In contrast, the 11 patients who later developed postoperative nausea and vomiting had a very short elimination half-life, only 9min (median, Pless than0.01). These patients were usually euhydrated but had microalbuminuria (Pless than0.03) and higher natriuresis (Pless than0.01). Conclusions: The degree of dehydration before major surgery was modest as evidenced both by urine sampling and volume kinetic analysis.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2014
National Category
Anesthesiology and Intensive Care
urn:nbn:se:liu:diva-112464 (URN)10.1111/aas.12416 (DOI)000343826500010 ()25307711 (PubMedID)

Funding Agencies|County Council of Ostergotland [LiO-314271, LiO-357621]

Available from: 2014-11-28 Created: 2014-11-28 Last updated: 2019-04-10Bibliographically approved

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