HypertensionPhase 4NCT01501929
Effects of Nebivolol on Skeletal Muscle During Exercise in Hypertensive Patients
A Phase 4 study testing Metoprolol succinate, Nebivolol and Non-invasive measurement of Cardiac Output (CO) in people with Hypertension, run by University of Texas Southwestern Medical Center at 1 site in United States.
Trial summary
The purpose of this study is to determine if Nebivolol improves microvascular perfusion in skeletal muscle during exercise in hypertensive patients and whether this improvement is accompanied by reduction in vascular oxidative stress or increased endothelial nitric oxide synthase (eNOS) expression in humans. Read more about this study
- Who is it for?
- Ages 18 to 65 yearsHealthy volunteers can take part
- Conditions the study is for
- Hypertension
- What is being tested?
- Metoprolol succinate, Nebivolol and Non-invasive measurement of Cardiac Output (CO)
- Type of treatment
- Injection or infusion, Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 32 participants
- Where
- 1 siteUnited States
- Study dates
- Aug 2010to Dec 2015
- Phase
- Phase 4
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- Healthy volunteers accepted
- Adult, Older adult
Who may be able to join
- Men and women with stage I primary untreated hypertension (BP between 140-159/90-99 mmHg)
- Age 18-65
Who cannot join
- Congestive heart failure
- Coronary artery disease
- Left ventricular hypertrophy by echocardiography or ECG
- History of stroke
- Average blood pressure >159/99 mmHg
- Bradycardia with a resting heart rate <55 bpm
Show all 15Show fewer
- Chronic kidney disease with a serum creatinine > 1.4 mg/dL
- Asthma or chronic obstructive pulmonary disease
- Women who are pregnant or planning to become pregnant
- Hypersensitivity to beta blockers, hydrochlorothiazide, or Definity
- Any history of substance abuse (other than tobacco)
- Concomitant drug treatment which raises endogenous nitric oxide levels, including nitrates or phosphodiesterase V inhibitors (Viagra, Levitra)
- History of symptomatic bradycardia or heart block
- Patients with Right-to-left, bidirectional, or transient right-to-left cardiac shunts
- Hypersensitivity to perflutren, blood, blood products or albumin.
Trial locations and contacts
1 site in 1 country.
United States1 site
UT Southwestern Medical Center
Dallas, Texas, 75390-8586
About this study
Official title: Effects of Nebivolol on Microvascular Perfusion in the Skeletal Muscles During Exercise in Hypertensive Patients
The purpose of this study is to determine if Nebivolol improves microvascular perfusion in skeletal muscle during exercise in hypertensive patients and whether this improvement is accompanied by reduction in vascular oxidative stress or increased endothelial nitric oxide synthase (eNOS) expression in humans.
Read the detailed description
In 32 untreated stage 1 hypertensive subjects, the investigators will measure blood pressure; noninvasive cardiac output by thoracic electrical bioimpedance (Bioz, Cardio Dynamics); forearm mediated vasodilation (FMD), which is a non-invasive assessment of endothelial function; collect venous endothelial cells; and measure microvascular perfusion using an Octafluoropropane microbubble contrast agent (Definity).
To obtain FMD, the brachial artery will be imaged using ultrasound. After a clear picture has been obtained, the cuff on the same arm will be inflated until it is tight for five minutes. During and following this, the subject's arm will continue to be imaged to monitor maximal increase in the brachial artery diameter.
To collect endothelial cells, a thin wire will be inserted in the vein to collect cells from the inner lining of the vein. The cells collected will be processed and stained for several proteins involved in endothelial cell function, using immunofluorescent technique.
To assess the microvascular perfusion in the skeletal muscle, a contrast agent (Definity) will be administered at baseline and after 5 minutes of rhythmic hand grip exercise at 30% of maximal voluntary contraction.
The investigators will then randomize our subjects to receive 12 weeks of Metoprolol or Nebivolol, using a cross over design. There will be a 4 week washout period between the two treatments. During the washout period, subjects will be followed after 2 weeks of drug withdrawal. Subjects found to have BP > 140/90 mmHg then, will be started on hydrochlorothiazide (HCTZ) at 25 mg once daily. Then subjects will be asked to return in 2 weeks. At that time HCTZ will be stopped if started in the earlier visit, and subject will be switched to the remaining treatment (Nebivolol or Metoprolol). Then, the investigators will assess microvascular perfusion in the skeletal muscle at rest and during handgrip exercise, endothelial function (FMD), and changes in endothelial cell protein expression after 12 weeks of Nebivolol and after 12 weeks of Metoprolol treatment in the same subjects.
- Conditions
- Hypertension
- Being tested
- Metoprolol succinate, Nebivolol, Non-invasive measurement of Cardiac Output (CO), Endothelial cell collection, Microvascular perfusion assessment using Definity
- Keywords
- hypertension, blood pressure, blood pressure medications, metoprolol, nebivolol, vascular oxidative stress, nitric oxide, nitric oxide synthase (eNOS), endothelium, endothelial dysfunction, endothelial cell protein expression, microvascular blood flow, flow mediated dilation, handgrip exercise, endothelial cell collection, microbubbles, Definity
- Medical subject headings
- Hypertension
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Metoprolol succinateDrug
Also called Toprol XL
The subject will be started on metoprolol succinate (Toprol XL) 100-300mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued.
NebivololDrug
Also called Bystolic
The subject will be started on nebivolol (Bystolic) 5-20mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued.
Non-invasive measurement of Cardiac Output (CO)Procedure or surgery
Also called Cardiac output by thoracic electrical bioimpedance, Bioz, Cardio Dynamics International Corporation
Cardiac Output (CO) will be measured non-invasively at rest and during exercise by thoracic electrical bioimpedance. Stroke volume will be derived from change in impedance/time measured during electrical systole. Cardiac output will be determined as the product of stroke volume and heart rate.
Endothelial cell collectionProcedure or surgery
Also called Endocell collection
We will collect endothelial cells from a superficial vein, usually in the arm. Following insertion of a peripheral intravenous (IV) catheter, we will collect cells from the inner lining of the vein using a thin, flexible J-tipped wire. The wire will be inserted through the IV into the vein and then removed, along with a sampling of endothelial cells. The cells collected will be processed and stained for several proteins involved in endothelial cell function, using immunofluorescent technique.
Microvascular perfusion assessment using DefinityProcedure or surgery
Using high-resolution ultrasound, we will measure skeletal muscle blood flow during infusion of a solution containing the octafluoropropane microbubble contrast agent, Definity. The solution will be a dilution of 1 vial of Definity to 30 cc of normal saline. The ultrasound probe will be placed over the forearm to obtain images while octafluoropropane microbubbles (Definity) are infused intravenously at the rate of 0.20 to 0.27 ml/min, not to exceed a maximum dose of 2 vials per study subject per day or visit. The microvascular perfusion assessment using Definity be performed at rest as well as during slow and fast handgrip exercises.
| Study group | Role | What they receive |
|---|---|---|
| Initial treatment with metoprolol | Active comparator | The subject will be started on metoprolol succinate (Toprol XL) 100-300mg daily, which he/she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. If necessary, 2 weeks after drug withdrawal, subjects will be started on HCTZ if BP > 140/90 mmHg and will continue HCTZ for a 2-week period, after which the subject will be transitioned to nebivolol (Bystolic) 5-20mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. Receives: Drug: Metoprolol succinate; Drug: Nebivolol; Procedure: Non-invasive measurement of Cardiac Output (CO); Procedure: Endothelial cell collection; Procedure: Microvascular perfusion assessment using Definity |
| Initial treatment with nebivolol | Active comparator | The subject will be started on nebivolol (Bystolic) 5-20mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. If necessary, 2 weeks after drug withdrawal, subject will be started on HCTZ if BP > 140/90 mmHg and will continue HCTZ for a 2-week period, after which the subject will be transitioned to metoprolol succinate (Toprol XL) 100-300mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. Receives: Drug: Metoprolol succinate; Drug: Nebivolol; Procedure: Non-invasive measurement of Cardiac Output (CO); Procedure: Endothelial cell collection; Procedure: Microvascular perfusion assessment using Definity |
What is being measured
The primary outcome is the main question the study is designed to answer.
Endothelial Cell Protein Expression p47phox From Endothelial Cell Collection
Endothelial cell (EC) was collected after a 20-guage angiocatheter was inserted into the contralateral forearm vein under sterile conditions. Three J-shaped vascular guidewires (St. Jude, St. Paul, MN) were advanced sequentially into the vein up to 10 cm. Endothelial cells were collected by gentle abrasion and placed into a dissociation buffer (0.5% bovine serum albumin, 2mM EDTA, and 100 ug/ml heparin in PBS). Endothelial cells were recovered from the tips of guide wires by repeated washing into collection tubes and subsequent centrifugation. EC were incubated with monoclonal antibodies against the polyclonal antibodies against NADPH oxidase p47 subunit. The intensity of staining was measured using fluorescence microscopy.
Measured: 12 weeks
Microvascular Blood Flow
Microvascular perfusion of skeletal muscle were measured during handgrip at 20 cycle per minute after 12 weeks of metoprolol, and after 12 weeks of nebivolol
Measured: 12 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted30 Dec 2011 (estimated)
- Study startAug 2010
- Primary completionDec 2015
- Study completionDec 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (24)Papers the sponsor has linked to this study.
- Other trials for HypertensionStudies of the same condition, open and under way.
- More trials run by University of Texas Southwestern Medical CenterThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 4
- Primary purpose
- Diagnosis
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Enrolment
- 32 participants (actual)
Sponsor and investigators
- Lead sponsor
- University of Texas Southwestern Medical Center
- Sponsor type
- University, hospital or other
- Collaborators
- Forest Laboratories
- Responsible party
- Principal investigator, Wanpen Vongpatanasin, University of Texas Southwestern Medical Center
- Investigators
- Wanpen Vongpatanasin, MD, Principal investigator, University of Texas Southwestern Medical Center
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01501929
- Sponsor's protocol ID
- Bystolic MD52
- Status last verified
- May 2018
- First submitted
- 29 Nov 2011
- Last updated
- 6 Nov 2018
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- Yes
Publications
Hamada M, Kazatani Y, Shigematsu Y, Ito T, Kokubu T, Ishise S. Enhanced blood pressure response to isometric handgrip exercise in patients with essential hypertension: effects of propranolol and prazosin. J Hypertens. 1987 Jun;5(3):305-9. doi: 10.1097/00004872-198706000-00007.
PubMed 3302040Saitoh M, Miyakoda H, Kitamura H, Kinugawa T, Hisatome I, Kotake H, Mashiba H. Cardiovascular and sympathetic nervous response to dynamic exercise in patients with essential hypertension. Intern Med. 1992 May;31(5):606-10. doi: 10.2169/internalmedicine.31.606.
PubMed 1387013Glezer GA, Lediashova GA. Changes in general haemodynamics and renal function during exercise in patients with arterial hypertension. Cor Vasa. 1975;17(1):1-13.
PubMed 1149456Kazatani Y, Hamada M, Shigematsu Y, Hiwada K, Kokubu T. Beneficial Effect of a Long-Term Antihypertensive Therapy on Blood Pressure Response to Isometric Handgrip Exercise in Patients with Essential Hypertension. Am J Ther. 1995 Mar;2(3):165-169. doi: 10.1097/00045391-199503000-00003.
PubMed 11847547Marraccini P, Palombo C, Giaconi S, Michelassi C, Genovesi-Ebert A, Marabotti C, Fommei E, Ghione S, L'Abbate A. Reduced cardiovascular efficiency and increased reactivity during exercise in borderline and established hypertension. Am J Hypertens. 1989 Dec;2(12 Pt 1):913-6. doi: 10.1093/ajh/2.12.913.
PubMed 2610996Kokkinos PF, Andreas PE, Coutoulakis E, Colleran JA, Narayan P, Dotson CO, Choucair W, Farmer C, Fernhall B. Determinants of exercise blood pressure response in normotensive and hypertensive women: role of cardiorespiratory fitness. J Cardiopulm Rehabil. 2002 May-Jun;22(3):178-83. doi: 10.1097/00008483-200205000-00009.
PubMed 12042686Schutz W, Hortnagl H, Magometschnigg D. Function of the autonomic nervous system in young, untreated hypertensive patients. Int J Cardiol. 1986 Feb;10(2):133-40. doi: 10.1016/0167-5273(86)90221-4.
PubMed 3002992Goodman JM, McLaughlin PR, Plyley MJ, Holloway RM, Fell D, Logan AG, Liu PP. Impaired cardiopulmonary response to exercise in moderate hypertension. Can J Cardiol. 1992 May;8(4):363-71.
PubMed 1535538Lund-Johansen P. Twenty-year follow-up of hemodynamics in essential hypertension during rest and exercise. Hypertension. 1991 Nov;18(5 Suppl):III54-61. doi: 10.1161/01.hyp.18.5_suppl.iii54.
PubMed 1937687de Champlain J, Petrovich M, Gonzalez M, Lebeau R, Nadeau R. Abnormal cardiovascular reactivity in borderline and mild essential hypertension. Hypertension. 1991 Apr;17(4 Suppl):III22-8. doi: 10.1161/01.hyp.17.4_suppl.iii22.
PubMed 2013489Zhao W, Swanson SA, Ye J, Li X, Shelton JM, Zhang W, Thomas GD. Reactive oxygen species impair sympathetic vasoregulation in skeletal muscle in angiotensin II-dependent hypertension. Hypertension. 2006 Oct;48(4):637-43. doi: 10.1161/01.HYP.0000240347.51386.ea. Epub 2006 Aug 28.
PubMed 16940212Ladage D, Brixius K, Hoyer H, Steingen C, Wesseling A, Malan D, Bloch W, Schwinger RH. Mechanisms underlying nebivolol-induced endothelial nitric oxide synthase activation in human umbilical vein endothelial cells. Clin Exp Pharmacol Physiol. 2006 Aug;33(8):720-4. doi: 10.1111/j.1440-1681.2006.04424.x.
PubMed 16895546Reidenbach C, Schwinger RH, Steinritz D, Kehe K, Thiermann H, Klotz T, Sommer F, Bloch W, Brixius K. Nebivolol induces eNOS activation and NO-liberation in murine corpus cavernosum. Life Sci. 2007 Jun 6;80(26):2421-7. doi: 10.1016/j.lfs.2007.04.016. Epub 2007 Apr 25.
PubMed 17512554Bragadeesh T, Sari I, Pascotto M, Micari A, Kaul S, Lindner JR. Detection of peripheral vascular stenosis by assessing skeletal muscle flow reserve. J Am Coll Cardiol. 2005 Mar 1;45(5):780-5. doi: 10.1016/j.jacc.2004.11.045.
PubMed 15734625Lindner JR, Womack L, Barrett EJ, Weltman J, Price W, Harthun NL, Kaul S, Patrie JT. Limb stress-rest perfusion imaging with contrast ultrasound for the assessment of peripheral arterial disease severity. JACC Cardiovasc Imaging. 2008 May;1(3):343-50. doi: 10.1016/j.jcmg.2008.04.001.
PubMed 19356447
Study at a glance
From the registry record, last updated by the sponsor on 6 Nov 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Nebivolol on Microvascular Perfusion in the Skeletal Muscles During Exercise in Hypertensive Patients
- ClinicalTrials.gov ID
- NCT01501929
- Acronym / sponsor ID
- Bystolic MD52
- Conditions
- Hypertension
- Keywords
- hypertension, blood pressure, blood pressure medications, metoprolol, nebivolol, vascular oxidative stress, nitric oxide, nitric oxide synthase (eNOS)
- Phase
- Phase 4
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 32 participants (actual)
- Lead sponsor
- University of Texas Southwestern Medical CenterUniversity, hospital or other
- Collaborators
- Forest Laboratories
- Study start
- Aug 2010
- Primary completion
- Dec 2015 (actual)
- Study completion
- Dec 2015 (actual)
- First posted
- 30 Dec 2011 (estimated)
- Results
- Posted 6 Nov 2018
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The purpose of this study is to determine if Nebivolol improves microvascular perfusion in skeletal muscle during exercise in hypertensive patients and whether this improvement is accompanied by reduction in vascular oxidative stress or increased endothelial nitric oxide synthase (eNOS) expression in humans.
Detailed description
In 32 untreated stage 1 hypertensive subjects, the investigators will measure blood pressure; noninvasive cardiac output by thoracic electrical bioimpedance (Bioz, Cardio Dynamics); forearm mediated vasodilation (FMD), which is a non-invasive assessment of endothelial function; collect venous endothelial cells; and measure microvascular perfusion using an Octafluoropropane microbubble contrast agent (Definity).
To obtain FMD, the brachial artery will be imaged using ultrasound. After a clear picture has been obtained, the cuff on the same arm will be inflated until it is tight for five minutes. During and following this, the subject's arm will continue to be imaged to monitor maximal increase in the brachial artery diameter.
To collect endothelial cells, a thin wire will be inserted in the vein to collect cells from the inner lining of the vein. The cells collected will be processed and stained for several proteins involved in endothelial cell function, using immunofluorescent technique.
To assess the microvascular perfusion in the skeletal muscle, a contrast agent (Definity) will be administered at baseline and after 5 minutes of rhythmic hand grip exercise at 30% of maximal voluntary contraction.
The investigators will then randomize our subjects to receive 12 weeks of Metoprolol or Nebivolol, using a cross over design. There will be a 4 week washout period between the two treatments. During the washout period, subjects will be followed after 2 weeks of drug withdrawal. Subjects found to have BP > 140/90 mmHg then, will be started on hydrochlorothiazide (HCTZ) at 25 mg once daily. Then subjects will be asked to return in 2 weeks. At that time HCTZ will be stopped if started in the earlier visit, and subject will be switched to the remaining treatment (Nebivolol or Metoprolol). Then, the investigators will assess microvascular perfusion in the skeletal muscle at rest and during handgrip exercise, endothelial function (FMD), and changes in endothelial cell protein expression after 12 weeks of Nebivolol and after 12 weeks of Metoprolol treatment in the same subjects.
Study design
- Primary purpose
- Diagnosis
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Initial treatment with metoprolol | Active comparator | Drug: Metoprolol succinate, Drug: Nebivolol, Procedure: Non-invasive measurement of Cardiac Output (CO), Procedure: Endothelial cell collection, Procedure: Microvascular perfusion assessment using DefinityThe subject will be started on metoprolol succinate (Toprol XL) 100-300mg daily, which he/she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. If necessary, 2 weeks after drug withdrawal, subjects will be started on HCTZ if BP > 140/90 mmHg and will continue HCTZ for a 2-week period, after which the subject will be transitioned to nebivolol (Bystolic) 5-20mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. |
| Initial treatment with nebivolol | Active comparator | Drug: Metoprolol succinate, Drug: Nebivolol, Procedure: Non-invasive measurement of Cardiac Output (CO), Procedure: Endothelial cell collection, Procedure: Microvascular perfusion assessment using DefinityThe subject will be started on nebivolol (Bystolic) 5-20mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. If necessary, 2 weeks after drug withdrawal, subject will be started on HCTZ if BP > 140/90 mmHg and will continue HCTZ for a 2-week period, after which the subject will be transitioned to metoprolol succinate (Toprol XL) 100-300mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (2 listed)
- Men and women with stage I primary untreated hypertension (BP between 140-159/90-99 mmHg)
- Age 18-65
Key exclusion criteria (15 listed)
- Congestive heart failure
- Coronary artery disease
- Left ventricular hypertrophy by echocardiography or ECG
- History of stroke
- Average blood pressure >159/99 mmHg
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Metoprolol succinateAlso: Toprol XLThe subject will be started on metoprolol succinate (Toprol XL) 100-300mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. | Drug | Initial treatment with metoprolol, Initial treatment with nebivolol |
| NebivololAlso: BystolicThe subject will be started on nebivolol (Bystolic) 5-20mg daily, which he or she will continue for a period of 12 weeks. Following the 12-week treatment period, the procedures listed below will be performed. After completion of the study procedures, the medication will be discontinued. | Drug | Initial treatment with metoprolol, Initial treatment with nebivolol |
| Non-invasive measurement of Cardiac Output (CO)Also: Cardiac output by thoracic electrical bioimpedance, Bioz, Cardio Dynamics International CorporationCardiac Output (CO) will be measured non-invasively at rest and during exercise by thoracic electrical bioimpedance. Stroke volume will be derived from change in impedance/time measured during electrical systole. Cardiac output will be determined as the product of stroke volume and heart rate. | Procedure or surgery | Initial treatment with metoprolol, Initial treatment with nebivolol |
| Endothelial cell collectionAlso: Endocell collectionWe will collect endothelial cells from a superficial vein, usually in the arm. Following insertion of a peripheral intravenous (IV) catheter, we will collect cells from the inner lining of the vein using a thin, flexible J-tipped wire. The wire will be inserted through the IV into the vein and then removed, along with a sampling of endothelial cells. The cells collected will be processed and stained for several proteins involved in endothelial cell function, using immunofluorescent technique. | Procedure or surgery | Initial treatment with metoprolol, Initial treatment with nebivolol |
| Microvascular perfusion assessment using DefinityUsing high-resolution ultrasound, we will measure skeletal muscle blood flow during infusion of a solution containing the octafluoropropane microbubble contrast agent, Definity. The solution will be a dilution of 1 vial of Definity to 30 cc of normal saline. The ultrasound probe will be placed over the forearm to obtain images while octafluoropropane microbubbles (Definity) are infused intravenously at the rate of 0.20 to 0.27 ml/min, not to exceed a maximum dose of 2 vials per study subject per day or visit. The microvascular perfusion assessment using Definity be performed at rest as well as during slow and fast handgrip exercises. | Procedure or surgery | Initial treatment with metoprolol, Initial treatment with nebivolol |
Primary outcome
Endothelial Cell Protein Expression p47phox From Endothelial Cell Collection
Time frame: 12 weeks
Endothelial cell (EC) was collected after a 20-guage angiocatheter was inserted into the contralateral forearm vein under sterile conditions. Three J-shaped vascular guidewires (St. Jude, St. Paul, MN) were advanced sequentially into the vein up to 10 cm. Endothelial cells were collected by gentle abrasion and placed into a dissociation buffer (0.5% bovine serum albumin, 2mM EDTA, and 100 ug/ml heparin in PBS). Endothelial cells were recovered from the tips of guide wires by repeated washing into collection tubes and subsequent centrifugation. EC were incubated with monoclonal antibodies against the polyclonal antibodies against NADPH oxidase p47 subunit. The intensity of staining was measured using fluorescence microscopy.
Microvascular Blood Flow
Time frame: 12 weeks
Microvascular perfusion of skeletal muscle were measured during handgrip at 20 cycle per minute after 12 weeks of metoprolol, and after 12 weeks of nebivolol
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 6 Nov 2018.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Background: PubMed 3302040Hamada M, Kazatani Y, Shigematsu Y, Ito T, Kokubu T, Ishise S. Enhanced blood pressure response to isometric handgrip exercise in patients with essential hypertension: effects of propranolol and prazosin. J Hypertens. 1987 Jun;5(3):305-9. doi: 10.1097/00004872-198706000-00007.
- Background: PubMed 1387013Saitoh M, Miyakoda H, Kitamura H, Kinugawa T, Hisatome I, Kotake H, Mashiba H. Cardiovascular and sympathetic nervous response to dynamic exercise in patients with essential hypertension. Intern Med. 1992 May;31(5):606-10. doi: 10.2169/internalmedicine.31.606.
- Background: PubMed 1149456Glezer GA, Lediashova GA. Changes in general haemodynamics and renal function during exercise in patients with arterial hypertension. Cor Vasa. 1975;17(1):1-13.
- Background: PubMed 11847547Kazatani Y, Hamada M, Shigematsu Y, Hiwada K, Kokubu T. Beneficial Effect of a Long-Term Antihypertensive Therapy on Blood Pressure Response to Isometric Handgrip Exercise in Patients with Essential Hypertension. Am J Ther. 1995 Mar;2(3):165-169. doi: 10.1097/00045391-199503000-00003.
- Background: PubMed 2610996Marraccini P, Palombo C, Giaconi S, Michelassi C, Genovesi-Ebert A, Marabotti C, Fommei E, Ghione S, L'Abbate A. Reduced cardiovascular efficiency and increased reactivity during exercise in borderline and established hypertension. Am J Hypertens. 1989 Dec;2(12 Pt 1):913-6. doi: 10.1093/ajh/2.12.913.
- Background: PubMed 12042686Kokkinos PF, Andreas PE, Coutoulakis E, Colleran JA, Narayan P, Dotson CO, Choucair W, Farmer C, Fernhall B. Determinants of exercise blood pressure response in normotensive and hypertensive women: role of cardiorespiratory fitness. J Cardiopulm Rehabil. 2002 May-Jun;22(3):178-83. doi: 10.1097/00008483-200205000-00009.
- Background: PubMed 3002992Schutz W, Hortnagl H, Magometschnigg D. Function of the autonomic nervous system in young, untreated hypertensive patients. Int J Cardiol. 1986 Feb;10(2):133-40. doi: 10.1016/0167-5273(86)90221-4.
- Background: PubMed 1535538Goodman JM, McLaughlin PR, Plyley MJ, Holloway RM, Fell D, Logan AG, Liu PP. Impaired cardiopulmonary response to exercise in moderate hypertension. Can J Cardiol. 1992 May;8(4):363-71.
- Background: PubMed 1937687Lund-Johansen P. Twenty-year follow-up of hemodynamics in essential hypertension during rest and exercise. Hypertension. 1991 Nov;18(5 Suppl):III54-61. doi: 10.1161/01.hyp.18.5_suppl.iii54.
- Background: PubMed 2013489de Champlain J, Petrovich M, Gonzalez M, Lebeau R, Nadeau R. Abnormal cardiovascular reactivity in borderline and mild essential hypertension. Hypertension. 1991 Apr;17(4 Suppl):III22-8. doi: 10.1161/01.hyp.17.4_suppl.iii22.
- Background: PubMed 16940212Zhao W, Swanson SA, Ye J, Li X, Shelton JM, Zhang W, Thomas GD. Reactive oxygen species impair sympathetic vasoregulation in skeletal muscle in angiotensin II-dependent hypertension. Hypertension. 2006 Oct;48(4):637-43. doi: 10.1161/01.HYP.0000240347.51386.ea. Epub 2006 Aug 28.
- Background: PubMed 16895546Ladage D, Brixius K, Hoyer H, Steingen C, Wesseling A, Malan D, Bloch W, Schwinger RH. Mechanisms underlying nebivolol-induced endothelial nitric oxide synthase activation in human umbilical vein endothelial cells. Clin Exp Pharmacol Physiol. 2006 Aug;33(8):720-4. doi: 10.1111/j.1440-1681.2006.04424.x.
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Pregnancy Related, Hypertension
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Wanpen Vongpatanasin, MD principal investigator
University of Texas Southwestern Medical Center
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 4 study testing Metoprolol succinate, Nebivolol and Non-invasive measurement of Cardiac Output (CO) in people with Hypertension, run by University of Texas Southwestern Medical Center at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 2 inclusion and 15 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 6 Nov 2018. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 4 studies take place after a treatment is approved, to learn more about its long-term benefits and risks in everyday use.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 6 Nov 2018). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Endothelial Cell Protein Expression p47phox From Endothelial Cell Collection (time frame: 12 weeks). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01501929, which also lists 24 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 6 Nov 2018.