1
|
Hoenemann JN, Moestl S, de Boni L, Hoffmann F, Arz M, Berger L, Pesta D, Heusser K, Mulder E, Lee SMC, Macias BR, Tank J, Jordan J. Cardiopulmonary deconditioning and plasma volume loss are not sufficient to provoke orthostatic hypertension. Hypertens Res 2024:10.1038/s41440-024-01710-x. [PMID: 38783144 DOI: 10.1038/s41440-024-01710-x] [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: 02/07/2024] [Revised: 03/19/2024] [Accepted: 04/12/2024] [Indexed: 05/25/2024]
Abstract
Orthostatic hypertension, defined by an increase of systolic blood pressure (SBP) of ≥20 mmHg upon standing, harbors an increased cardiovascular risk. We pooled data from two rigorously conducted head-down tilt bedrest studies to test the hypothesis that cardiopulmonary deconditioning and hypovolemia predispose to orthostatic hypertension. With bedrest, peak VO2 decreased by 6 ± 4 mlO2/min/kg (p < 0.0001) and plasma volume by 367 ± 348 ml (p < 0.0001). Supine SBP increased from 127 ± 9 mmHg before to 133 ± 10 mmHg after bedrest (p < 0.0001). In participants with stable hemodynamics following head-up tilt, the incidence of orthostatic hypertension was 2 out of 67 participants before bedrest and 2 out of 57 after bedrest. We conclude that in most healthy persons, cardiovascular deconditioning and volume loss associated with long-term bedrest are not sufficient to cause orthostatic hypertension.
Collapse
Affiliation(s)
- J-N Hoenemann
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Clinic III for Internal Medicine, Kerpener Str. 62, 50937, Cologne, Germany
| | - S Moestl
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - L de Boni
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - F Hoffmann
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
- University of Cologne, Faculty of Medicine and University Hospital Cologne, Clinic III for Internal Medicine, Kerpener Str. 62, 50937, Cologne, Germany
| | - M Arz
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - L Berger
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - D Pesta
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - K Heusser
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - E Mulder
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | | | - B R Macias
- NASA Johnson Space Center, Houston, TX, USA
| | - J Tank
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany
| | - J Jordan
- German Aerospace Center-DLR, Institute of Aerospace Medicine, Cologne, Germany.
- Medical Faculty, University of Cologne, Cologne, Germany.
| |
Collapse
|
2
|
Schierbauer J, Sanfilippo S, Grothoff A, Fehr U, Wachsmuth N, Voit T, Zimmermann P, Moser O. Effect of Fluid Intake on Acute Changes in Plasma Volume: A Randomized Controlled Crossover Pilot Trial. Metabolites 2024; 14:263. [PMID: 38786740 PMCID: PMC11123201 DOI: 10.3390/metabo14050263] [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: 03/07/2024] [Revised: 04/09/2024] [Accepted: 05/05/2024] [Indexed: 05/25/2024] Open
Abstract
Plasma volume (PV) undergoes constant and dynamic changes, leading to a large intra-day variability in healthy individuals. Hydration is known to induce PV changes; however, the response to the intake of osmotically different fluids is still not fully understood. In a randomized controlled crossover trial, 18 healthy individuals (10 females) orally received an individual amount of an isotonic sodium-chloride (ISO), Ringer (RIN), or glucose (GLU) solution. Hemoglobin mass (Hbmass) was determined with the optimized carbon monoxide re-breathing method. Fluid-induced changes in PV were subsequently calculated based on capillary hemoglobin concentration ([Hb]) and hematocrit (Hct) before and then every 10 minutes until 120 min (t0-120) after the fluid intake and compared to a control trial arm (CON), where no fluid was administered. Within GLU and CON trial arms, no statistically significant differences from baseline until t120 were found (p > 0.05). In the ISO trial arm, PV was significantly increased at t70 (+138 mL, p = 0.01), t80 (+191 mL, p < 0.01), and t110 (+182 mL, p = 0.01) when compared to t0. Moreover, PV in the ISO trial arm was significantly higher at t70 (p = 0.02), t110 (p = 0.04), and t120 (p = 0.01) when compared to the same time points in the CON trial arm. Within the RIN trial arm, PV was significantly higher between t70 and t90 (+183 mL, p = 0.01) and between t110 (+194 mL, p = 0.03) and t120 (+186 mL, p < 0.01) when compared to t0. These results demonstrated that fluids with a higher content of osmotically active particles lead to acute hemodilution, which is associated with a decrease in [Hb] and Hct. These findings underpin the importance of the hydration state on PV and especially on PV constituent levels in healthy individuals.
Collapse
Affiliation(s)
- Janis Schierbauer
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Sabrina Sanfilippo
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Auguste Grothoff
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Ulrich Fehr
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Nadine Wachsmuth
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Thomas Voit
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Paul Zimmermann
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
| | - Othmar Moser
- Division of Exercise Physiology and Metabolism, Bayreuth Centre of Sport Science, University of Bayreuth, 95440 Bayreuth, Germany; (S.S.); (A.G.); (U.F.); (N.W.); (T.V.); (P.Z.); (O.M.)
- Interdisciplinary Metabolic Medicine Trials Unit, Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, 8036 Graz, Austria
| |
Collapse
|
3
|
Şarkaya K, Özçelik H, Yaşar E, Güner T, Dokuzparmak E, Hooshmand S, Akgöl S. Selective Extraction and Quantification of Hemoglobin Based on a Novel Molecularly Imprinted Nanopolymeric Structure of Poly(acrylamide-vinyl imidazole). ACS OMEGA 2024; 9:18458-18468. [PMID: 38680349 PMCID: PMC11044176 DOI: 10.1021/acsomega.4c00547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 03/19/2024] [Accepted: 03/28/2024] [Indexed: 05/01/2024]
Abstract
Imbalances in hemoglobin (Hb) levels can lead to conditions such as anemia or polycythemia, emphasizing the importance of precise Hb extraction from blood. To address this, a novel synthetic imprinted polymer was meticulously developed for capturing and separating Hb. Poly(acrylamide-vinylimidazole) nanopolymer (poly(AAm-VIM)) was synthesized using acrylamide and vinyl imidazole as functional monomers through surfactant-free emulsion polymerization. Characterization using FTIR, particle size, zeta potential, and SEM ensured the polymer's structure. The Hb-imprinted nanopolymer (Hb-poly(AAm-VIM)) demonstrated notable specificity, with a calculated Hb-specific adsorption value (Qmax) of 3.7377 mg/g in a medium containing 2.5 mg/mL Hb. The molecularly imprinted polymer (MIP) exhibited approximately 5 times higher Hb adsorption than the nonimprinted polymer (NIP). Under the same conditions, the imprinted nanopolymer displayed 2.39 and 2.17 times greater selectivity for Hb over competing proteins such as bovine serum albumin (BSA) and lysozyme (Lys), respectively. Also, SDS-PAGE analysis results confirmed the purification of Hb by the molecularly imprinted nanopolymer. These results underscore the heightened specificity and efficacy of the molecularly imprinted nanopolymer in selectively targeting Hb atoms among other proteins. Incorporating such polymers is justified by their notable affinity, cost-effectiveness, and facile production. This research contributes valuable insights into optimizing synthetic imprinted polymers for efficient Hb extraction, with potential in medical diagnostics and treatment applications.
Collapse
Affiliation(s)
- Koray Şarkaya
- Department
of Chemistry, Faculty of Science, Pamukkale
University, Denizli 20160, Turkey
| | - Hilal Özçelik
- Department
of Biochemistry, Faculty of Science, Ege
University, Izmir 35100, Turkey
| | - Esra Yaşar
- Department
of Biochemistry, Faculty of Science, Ege
University, Izmir 35100, Turkey
| | - Timuçin Güner
- Department
of Biochemistry, Faculty of Science, Ege
University, Izmir 35100, Turkey
| | - Emre Dokuzparmak
- Department
of Bioengineering, Ege University, Izmir 35100, Turkey
| | - Sara Hooshmand
- Sabanci
University Nanotechnology Research and Application Center (SUNUM), Tuzla, Istanbul 34956, Turkey
| | - Sinan Akgöl
- Department
of Biochemistry, Faculty of Science, Ege
University, Izmir 35100, Turkey
- Sabanci
University Nanotechnology Research and Application Center (SUNUM), Tuzla, Istanbul 34956, Turkey
| |
Collapse
|
4
|
Lichtman MA, Prchal JT. Measurement of red cell, plasma and blood volume: Essential components of diagnostic and research studies of oxygen transport. Blood Cells Mol Dis 2024; 105:102819. [PMID: 38101224 DOI: 10.1016/j.bcmd.2023.102819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 12/04/2023] [Indexed: 12/17/2023]
Affiliation(s)
- Marshall A Lichtman
- Department of Medicine, James P. Wilmot Cancer Institute, University of Rochester Medical Center, 601 Elmwood Avenue, Rochester, NY 14642-0001, USA.
| | - Josef T Prchal
- Division of Hematology & Hematologic Malignancies, Huntsman Cancer Institute, The University of Utah School of Medicine, 30 North 1900 East, Salt Lake City, UT 84132, USA.
| |
Collapse
|
5
|
Furst B, González-Alonso J. The heart, a secondary organ in the control of blood circulation. Exp Physiol 2023. [PMID: 38126953 DOI: 10.1113/ep091387] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 11/30/2023] [Indexed: 12/23/2023]
Abstract
Circulation of the blood is a fundamental physiological function traditionally ascribed to the pressure-generating function of the heart. However, over the past century the 'cardiocentric' view has been challenged by August Krogh, Ernst Starling, Arthur Guyton and others, based on haemodynamic data obtained from isolated heart preparations and organ perfusion. Their research brought forth experimental evidence and phenomenological observations supporting the concept that cardiac output occurs primarily in response to the metabolic demands of the tissues. The basic tenets of Guyton's venous return model are presented and juxtaposed with their critiques. Developmental biology of the cardiovascular system shows that the blood circulates before the heart has achieved functional integrity and that its movement is intricately connected with the metabolic demands of the tissues. Long discovered, but as yet overlooked, negative interstitial pressure may play a role in assisting the flow returning to the heart. Based on these phenomena, an alternative circulation model has been proposed in which the heart functions like a hydraulic ram and maintains a dynamic equilibrium between the arterial (centrifugal) and venous (centripetal) forces which define the blood's circular movement. In this focused review we introduce some of the salient arguments in support of the proposed circulation model. Finally, we present evidence that exercising muscle blood flow is subject to local metabolic control which upholds optimal perfusion in the face of a substantive rise in muscle vascular conductance, thus lending further support to the permissive role of the heart in the overall control of blood circulation.
Collapse
Affiliation(s)
- Branko Furst
- Department of Anesthesiology, Albany Medical Center, Albany, New York, USA
| | - José González-Alonso
- Sport, Health and Exercise Sciences, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Uxbridge, UK
| |
Collapse
|