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Nørskov MP, Mønsted T, Kimer N, Damgaard M, Møller S. Can Plasma Volume Determination in Cirrhosis Be Replaced by an Algorithm Using Body Weight and Hematocrit? Diagnostics (Basel) 2024; 14:835. [PMID: 38667480 PMCID: PMC11049127 DOI: 10.3390/diagnostics14080835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/12/2024] [Accepted: 04/14/2024] [Indexed: 04/28/2024] Open
Abstract
BACKGROUND Patients with cirrhosis often develop hyperdynamic circulation with increased cardiac output, heart rate, and redistribution of the circulating volume with expanded plasma volume (PV). PV determination is part of the evaluation of patients with cirrhosis, but gold-standard methods are invasive, expensive, and time-consuming. Therefore, other estimations of PV would be preferable, and the aim of this study was therefore to study if PV, as assessed by a simplified algorithm based on hematocrit and weight, can replace the gold-standard method. METHODS We included 328 patients with cirrhosis who had their PV assessed by the indicator dilution technique as the gold-standard method (PVI-125). Actual PV was estimated as PVa = (1 - hematocrit)·(a + (b·body weight)). Ideal PV was estimated as PVi = c · body weight, where a, b, and c are constants. RESULTS PVI-125, PVa, and PVi were 3.99 ± 1.01, 3.09 ± 0.54, and 3.01 ± 0.65 (Mean ± SD), respectively. Although PVI-125 correlated significantly with PVa (r = 0.72, p < 0.001), a Bland-Altman plot revealed wide limits of confidence. CONCLUSIONS The use of simplified algorithms does not sufficiently estimate PV and cannot replace the indicator dilution technique.
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Affiliation(s)
- Martine Prütz Nørskov
- Center of Functional and Diagnostic Imaging and Research, Department of Clinical Physiology and Nuclear Medicine 260, Copenhagen University Hospital, 2650 Hvidovre, Denmark; (T.M.); (M.D.); (S.M.)
| | - Thormod Mønsted
- Center of Functional and Diagnostic Imaging and Research, Department of Clinical Physiology and Nuclear Medicine 260, Copenhagen University Hospital, 2650 Hvidovre, Denmark; (T.M.); (M.D.); (S.M.)
| | - Nina Kimer
- Gastro Unit, Medical Division, Copenhagen University Hospital, 2650 Hvidovre, Denmark;
| | - Morten Damgaard
- Center of Functional and Diagnostic Imaging and Research, Department of Clinical Physiology and Nuclear Medicine 260, Copenhagen University Hospital, 2650 Hvidovre, Denmark; (T.M.); (M.D.); (S.M.)
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, Copenhagen University, 2200 Copenhagen, Denmark
| | - Søren Møller
- Center of Functional and Diagnostic Imaging and Research, Department of Clinical Physiology and Nuclear Medicine 260, Copenhagen University Hospital, 2650 Hvidovre, Denmark; (T.M.); (M.D.); (S.M.)
- Department of Clinical Medicine, Faculty of Health and Medical Sciences, Copenhagen University, 2200 Copenhagen, Denmark
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Helman J, Öberg CM. High versus low ultrafiltration rates during experimental peritoneal dialysis in rats: Acute effects on plasma volume and systemic haemodynamics. Perit Dial Int 2023; 43:84-91. [PMID: 35012402 DOI: 10.1177/08968608211069224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
INTRODUCTION Intradialytic hypotension is a common complication of haemodialysis, but uncommon in peritoneal dialysis (PD). This may be due to lower ultrafiltration rates in PD compared to haemodialysis, allowing for sufficient refilling of the blood plasma compartment from the interstitial volume, but the underlying mechanisms are unknown. Here we assessed plasma volume and hemodynamic alterations during experimental PD with high versus low ultrafiltration rates. METHODS Experiments were conducted in two groups of healthy Sprague-Dawley rats: one group with a high ultrafiltration rate (N = 7) induced by 8.5% glucose and a low UF group (N = 6; 1.5% glucose), with an initial assessment of the extracellular fluid volume, followed by 30 min PD with plasma volume measurements at baseline, 5, 10, 15 and 30 min. Mean arterial pressure, central venous pressure and heart rate were continuously monitored during the experiment. RESULTS No significant changes over time in plasma volume, mean arterial pressure or central venous pressure were detected during the course of the experiments, despite an ultrafiltration (UF) rate of 56 mL/h/kg in the high UF group. In the high UF group, a decrease in extracellular fluid volume of -7 mL (-10.7% (95% confidence interval: -13.8% to -7.6%)) was observed, in line with the average UF volume of 8.0 mL (standard deviation: 0.5 mL). CONCLUSION Despite high UF rates, we found that plasma volumes were remarkably preserved in the present experiments, indicating effective refilling of the plasma compartment from interstitial tissues. Further studies should clarify which mechanisms preserve the plasma volume during high UF rates in PD.
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Affiliation(s)
- Jakob Helman
- Department of Clinical Sciences Lund, Nephrology Division, Skåne University Hospital, Lund University, Sweden
| | - Carl M Öberg
- Department of Clinical Sciences Lund, Nephrology Division, Skåne University Hospital, Lund University, Sweden
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3
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Gamma camera imaging of radiolabeled red blood cells. Nucl Med Mol Imaging 2022. [DOI: 10.1016/b978-0-12-822960-6.00213-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Matsubayashi Y, Yoshida A, Suganami H, Oe M, Sato T, Yaguchi Y, Fujihara K, Yamada T, Tanaka S, Kaku K, Sone H. Association of estimated plasma volume and weight loss after long-term administration and subsequent discontinuation of the sodium-glucose cotransporter-2 inhibitor tofogliflozin. Diabetes Obes Metab 2021; 23:1660-1665. [PMID: 33769665 PMCID: PMC8252731 DOI: 10.1111/dom.14387] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 03/17/2021] [Accepted: 03/19/2021] [Indexed: 12/17/2022]
Abstract
Sodium-glucose cotransporter-2 inhibitors (SGLT2) are drugs that have been reported to have several effects through the regulation of plasma volume, for example, antihypertensive effects. This study aimed to clarify the impact of long-term administration and subsequent discontinuation of the SGLT2 inhibitor tofogliflozin on estimated plasma volume (ePV), brain natriuretic peptide (BNP) and the relationship between changes in ePV, BNP and body weight (BW). Data from 157 participants with type 2 diabetes receiving tofogliflozin monotherapy in a phase 3 study were analysed. Changes in variables or correlations among them during a 52-week administration and a 2-week post-treatment period were investigated. Percent change in ePV was calculated using the Strauss formula. Significant decreases in BW, ePV and ln-transformed BNP (ln-BNP) were noted by week 52. %ΔBW was not significantly correlated with %ΔePV and Δln-BNP, while %ΔePV was significantly correlated with Δln-BNP. Two weeks after discontinuation of tofogliflozin, BW, ePV and ln-BNP were significantly increased. %ΔBW was significantly correlated with %ΔePV and Δln-BNP. Furthermore, ePV and BNP were significantly higher than baseline levels.
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Affiliation(s)
- Yasuhiro Matsubayashi
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
| | - Akihiro Yoshida
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
- Kowa Company, LtdTokyoJapan
| | | | - Momoko Oe
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
- Kowa Company, LtdTokyoJapan
| | - Takaaki Sato
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
| | - Yuta Yaguchi
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
| | - Kazuya Fujihara
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
| | - Takaho Yamada
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
| | - Shiro Tanaka
- Department of Clinical BiostatisticsGraduate School of Medicine, Kyoto UniversityKyotoJapan
| | | | - Hirohito Sone
- Department of Haematology, Endocrinology and Metabolism, Faculty of MedicineNiigata UniversityNiigataJapan
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Statkevicius S, Bonnevier J, Fisher J, Bark BP, Larsson E, Öberg CM, Kannisto P, Tingstedt B, Bentzer P. Albumin infusion rate and plasma volume expansion: a randomized clinical trial in postoperative patients after major surgery. CRITICAL CARE : THE OFFICIAL JOURNAL OF THE CRITICAL CARE FORUM 2019; 23:191. [PMID: 31138247 PMCID: PMC6537197 DOI: 10.1186/s13054-019-2477-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 05/14/2019] [Indexed: 01/22/2023]
Abstract
Background Optimal infusion rate of colloids in patients with suspected hypovolemia is unknown, and the primary objective of the present study was to test if plasma volume expansion by 5% albumin is greater if fluid is administered slowly rather than rapidly. Methods Patients with signs of hypoperfusion after major abdominal surgery were randomized to intravenous infusion of 5% albumin at a dose of 10 ml/kg (ideal body weight) either rapidly (30 min) or slowly (180 min). Plasma volume was measured using radiolabeled albumin at baseline, at 30 min, and at 180 min after the start of infusion. Primary outcome was change in plasma volume from the start of infusion to 180 min after the start of infusion. Secondary outcomes included the change in the area under the plasma volume curve and transcapillary escape rate (TER) for albumin from 180 to 240 min after the start of albumin infusion. Results A total of 33 and 31 patients were included in the analysis in the slow and rapid groups, respectively. The change in plasma volume from the start of infusion to 180 min did not differ between the slow and rapid infusion groups (7.4 ± 2.6 vs. 6.5 ± 4.1 ml/kg; absolute difference, 0.9 ml/kg [95%CI, − 0.8 to 2.6], P = 0.301). Change in the area under the plasma volume curve was smaller in the slow than in the rapid infusion group and was 866 ± 341 and 1226 ± 419 min ml/kg, respectively, P < 0.001. TER for albumin did not differ and was 5.3 ± 3.1%/h and 5.4 ± 3%/h in the slow and in the rapid infusion groups, respectively, P = 0.931. Conclusions This study does not support our hypothesis that a slow infusion of colloid results in a greater plasma volume expansion than a rapid infusion. Instead, our result of a smaller change in the area under the plasma volume curve indicates that a slow infusion results in a less efficient plasma volume expansion, but further studies are required to confirm this finding. A rapid infusion has no effect on vascular leak as measured after completion of the infusion. Trial registration EudraCT2013-004446-42 registered December 23, 2014. Electronic supplementary material The online version of this article (10.1186/s13054-019-2477-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Johan Bonnevier
- Department of Anesthesia & Intensive Care, Skåne University Hospital, Lund, Sweden
| | - Jane Fisher
- Department of Infectious Diseases, Skåne University Hospital, Lund, Sweden
| | - Björn P Bark
- Department of Anesthesia & Intensive Care, Skåne University Hospital, Lund, Sweden
| | - Erik Larsson
- Department of Radiation Physics, Skåne University Hospital, Lund, Sweden
| | - Carl M Öberg
- Department of Nephrology, Skåne University Hospital, Lund, Sweden
| | - Päivi Kannisto
- Department of Gynecology and Obstetrics, Skåne University Hospital, Lund, Sweden
| | - Bobby Tingstedt
- Department of Surgery, Skåne University Hospital, Lund, Sweden
| | - Peter Bentzer
- Department of Anesthesia and Intensive Care, Helsingborg Hospital, Helsingborg and Lund University, 251 87, Helsingborg, Sweden. .,Department of Clinical Sciences, Anesthesiology, Lund University, Lund, Sweden.
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Rapid Bolus Administration Does not Increase The Extravasation Rate of Albumin: A Randomized Controlled Trial in The Endotoxemic Pig. Shock 2018; 47:514-519. [PMID: 27749758 DOI: 10.1097/shk.0000000000000761] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Some experimental data suggest that rapid bolus administration of albumin causes less plasma-expanding effects than slow, continuous infusion. To determine whether rapid bolus administration, in comparison with slow infusion, results in greater extravasation of albumin in experimental septic shock we performed a randomized controlled trial with 32 endotoxemic pigs. The animals were monitored and ventilated with standard intensive care equipment and given 10 mL × kg 5% albumin labeled with Technetium-99m, either as a rapid 15-min bolus (Bolus group, n = 16) or as a 2-h infusion (Infusion group, n = 16). Radioactivity was monitored in plasma, extracellular microdialysate, and urine for 6 h. Physiological parameters were monitored hourly. Radioactivity in the liver, spleen, kidney, and lung was analyzed post mortem.The plasma area under the curve activity0-6 h was 4.4 ± 0.9 × 10 in the Bolus group and 4.4 ± 1.1 × 10 counts × min × mL × h in the Infusion group. Blood hemoglobin levels increased in both groups, suggesting severe capillary leakage. Yet, there were no group differences in albumin radioactivity in plasma, muscle tissue, urine, or in the post-mortem analysis of the organs. Following albumin administration, circulatory and respiratory parameters were similar in the two groups.In conclusion, the present results suggest that albumin might be given as a bolus without leading to increased extravasation of albumin, in contrast to previous animal experiments in rodents.
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Statkevicius S, Bonnevier J, Bark BP, Larsson E, Öberg CM, Kannisto P, Tingstedt B, Bentzer P. The importance of albumin infusion rate for plasma volume expansion following major abdominal surgery - AIR: study protocol for a randomised controlled trial. Trials 2016; 17:578. [PMID: 27923389 PMCID: PMC5142270 DOI: 10.1186/s13063-016-1714-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2015] [Accepted: 11/17/2016] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND Administration of fluids to restore normovolaemia is one of the most common therapeutic interventions performed peri-operatively and in the critically ill, but no study has evaluated the importance of infusion rate for the plasma volume-expanding effect of a resuscitation fluid. The present study is designed to test the hypothesis that a slow infusion of resuscitation fluid results in better plasma volume expansion than a rapid infusion. METHODS/DESIGN The study is a single-centre, assessor-blinded, parallel-group, randomised prospective study. Patients over 40 years of age admitted to the post-operative care unit after a Whipple procedure or major gynaecological surgery and presenting with signs of hypovolaemia are eligible for inclusion. Patients are randomised in a 1:1 fashion with no stratification to either rapid (30 minutes) or slow (180 minutes) infusion of 5% albumin at a dose of 10 ml/kg ideal body weight. Plasma volume is measured using 125I human serum albumin at baseline (prior to albumin infusion) as well as at 30 minutes and 180 minutes after infusion start. The primary endpoint is change in plasma volume from baseline to 180 minutes after the start of 5% albumin infusion. Secondary endpoints include the integral of plasma volume over time from baseline to 180 minutes after the start of the infusion and transcapillary escape rate of albumin (%/h) from 180 minutes to 240 minutes after the start of albumin infusion. In addition, diuresis, change in central venous oxygen saturation, lactate and blood pressure will be evaluated. A total of 70 patients will be included in the study, and the study has 80% power to detect a difference of 4 ml/kg in plasma volume expansion between the two groups. DISCUSSION The present study is the first clinical investigation of the importance of infusion rate for the plasma volume-expanding effect of a resuscitation fluid. TRIAL REGISTRATION EudraCT identifier: 2013-004446-42 . Registration date: 20 December 2013. ClinicalTrials.gov identifier: NCT02728921 . Registration date: 31 March 2016.
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Affiliation(s)
- Svajunas Statkevicius
- Department of Anaesthesia and Intensive Care, Skåne University Hospital, Lund, Sweden
| | - Johan Bonnevier
- Department of Anaesthesia and Intensive Care, Skåne University Hospital, Lund, Sweden
| | - Björn P. Bark
- Department of Anaesthesia and Intensive Care, Skåne University Hospital, Lund, Sweden
| | - Erik Larsson
- Department of Radiation Physics, Skåne University Hospital, Lund, Sweden
| | - Carl M. Öberg
- Department of Nephrology, Skåne University Hospital, Lund, Sweden
| | - Päivi Kannisto
- Department of Gynaecology and Obstetrics, Skåne University Hospital, Lund, Sweden
| | - Bobby Tingstedt
- Department of Surgery, Skåne University Hospital, Lund, Sweden
| | - Peter Bentzer
- Department of Anaesthesia and Intensive Care, Helsingborg Hospital and Lund University, 251 87 Helsingborg, Sweden
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Roux-en-Y gastric bypass alleviates hypertension and is associated with an increase in mid-regional pro-atrial natriuretic peptide in morbid obese patients. J Hypertens 2016; 33:1215-25. [PMID: 25668345 DOI: 10.1097/hjh.0000000000000526] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To examine 24-h blood pressure (24BP), systemic haemodynamics and the effect of sodium intake on 24BP in obese patients before and after gastric bypass surgery [laparoscopic Roux-en-Y gastric bypass (LRYGB)], and to determine whether weight loss from LRYGB might be related to an increase in plasma concentrations of atrial natriuretic peptide. METHODS Twelve hypertensive and 12 normotensive morbidly obese patients underwent LRYGB: 24BP, systemic haemodynamics and mid-regional pro-atrial natriuretic peptide (MRproANP) were assessed before, 6 weeks and 12 months after surgery. The effect of high versus low sodium intake on 24BP was evaluated before and 12 months after LRYGB. RESULTS Six weeks after LRYGB, the average weight loss was 20 kg, with a further 21 kg weight loss 1 year after surgery. In hypertensive patients, 24BP was significantly reduced at 6 weeks, but not 1 year after LRYGB. However, antihypertensive medications were successively reduced from baseline to 1 year after surgery. In normotensive patients, there was no change in 24BP 6 weeks after LRYGB, but a tendency towards a reduction 1 year after the operation. Plasma concentrations of MRproANP were subnormal prior to surgery in hypertensive patients and increased by 77% 1 year after the operation. In normotensive patients, preoperative concentrations were normal and increased only by 6%. High sodium intake induced plasma volume expansion, increased stroke volume and cardiac output, but no significant change in 24BP - neither before nor after LRYGB. CONCLUSIONS LRYGB resulted in a significant 24BP reduction and a substantial increase in MRproANP plasma concentrations in hypertensive, obese patients 6 weeks after surgery, suggesting a causal link between obesity-hypertension and altered release/degradation of cardiac natriuretic peptides.
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The influence of high versus low sodium intake on blood pressure and haemodynamics in patients with morbid obesity. J Hypertens 2015; 31:2220-9; discussion 2229. [PMID: 23868085 DOI: 10.1097/hjh.0b013e328363c769] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
BACKGROUND Many patients with morbid obesity (BMI > 40 kg/m) have hypertension. The complex pathophysiological abnormalities linking hypertension to obesity have not been fully clarified, but abnormal sodium handling could be an important mechanism. METHOD Therefore, we examined changes in body fluid compartments and haemodynamic responses (at rest and during exercise) after 5 days of a low-sodium diet (90 mmol/day) and 5 days of a high-sodium diet (250 mmol/day) in 12 morbidly obese, hypertensive patients; 12 morbidly obese, normotensive patients and 12 nonobese controls. RESULTS High sodium intake as compared to low sodium intake was associated with an increase in plasma volume (obese, hypertensive patients: 5 ± 4%; obese, normotensive patients: 10 ± 11%; nonobese controls: 7 ± 6%), cardiac output (CO) (obese, hypertensive patients: 17 ± 12%; obese, normotensive patients: 20 ± 16%; nonobese controls: 13 ± 14%) and stroke volume (SV) (obese, hypertensive patients: 27 ± 26%; obese, normotensive patients: 27 ± 24%; nonobese controls: 18 ± 27%) in all three groups with no differences between the groups. Despite an increase in CO during high salt intake, 24-h blood pressure (BP) was unchanged in patients and controls as a result of a reduction in total peripheral resistance (obese, hypertensive patients: -11 ± 11%; obese, normotensive patients: -10 ± 12%; nonobese controls: -5 ± 14%). Similar changes were observed during an incremental bicycle exercise test wherein CO and SV were higher, whereas mean arterial BP was unchanged at each exercise level during high sodium intake. CONCLUSION Despite substantial increases in CO and SV, we did not observe any significant change in BP during high sodium intake, neither in morbid obese patients nor in lean individuals.
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Gómez Perales JL. Blood volume analysis by radioisotopic dilution techniques: state of the art. Appl Radiat Isot 2014; 96:71-82. [PMID: 25479437 DOI: 10.1016/j.apradiso.2014.11.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Revised: 09/19/2014] [Accepted: 11/14/2014] [Indexed: 12/17/2022]
Abstract
In the last years, there has been a growing recognition of the importance of blood volume abnormalities in the pathophysiology of several conditions and, consequently, a growing interest of accurate and rapid volume status assessment. Accordingly, there has been a surge of interest in blood volume analysis by radioisotopic dilution technique. However, there are still some controversies about this technique, such as the use of the f-cell ratio, the errors associated with the method and the reference values. This review aims to revise and discuss the theoretical and methodological aspects of this technique and also to discuss their controversies. Furthermore, it is questioned whether red cell volume or plasma volume can be accurately estimated once the other quantity has been measured or should red cell volume and plasma volume be directly measured. As a conclusion, blood volume analysis by radioisotopic dilution technique is still valid and very useful.
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Affiliation(s)
- Jesús Luis Gómez Perales
- Nuclear Medicine Service, Puerta del Mar University Hospital, Avenida Ana de Viya 21, 11009 Cádiz, Spain.
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Henriksen UL, Henriksen JH, Bendtsen F, Møller S. 99mTc-labelled human serum albumin cannot replace125I-labelled human serum albumin to determine plasma volume in patients with liver disease. Clin Physiol Funct Imaging 2012; 33:211-7. [DOI: 10.1111/cpf.12015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Accepted: 11/28/2012] [Indexed: 11/26/2022]
Affiliation(s)
- Ulrik Lütken Henriksen
- Clinical Physiology and Nuclear Medicine 239; Center of Functional and Diagnostic Imaging and Research; Hvidovre Hospital; University of Copenhagen; Copenhagen; Denmark
| | - Jens H. Henriksen
- Clinical Physiology and Nuclear Medicine 239; Center of Functional and Diagnostic Imaging and Research; Hvidovre Hospital; University of Copenhagen; Copenhagen; Denmark
| | - Flemming Bendtsen
- Faculty of Health Sciences; Department of Gastroenterology 439; Hvidovre Hospital; University of Copenhagen; Copenhagen; Denmark
| | - Søren Møller
- Clinical Physiology and Nuclear Medicine 239; Center of Functional and Diagnostic Imaging and Research; Hvidovre Hospital; University of Copenhagen; Copenhagen; Denmark
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