HypertensionNCT05349825
Investigation of MDR1 Gene Polymorphism and Losartan Plasma Concentration in Patients Undergoing Hypertensive Episodes While Under Losartan Treatment
An observational study of Hypertension, run by Pamukkale University at 1 site in Turkey (Türkiye).
Trial summary
Losartan is an antihypertensive drug belonging to the ARB family. It is characterized as the substrate of the Multi Drug Resistance-1 (MDR1) drug-efflux protein (a pump that ensures the removal of drugs/foreign substances out of the cell) encoded by the ATP Binding Cassette Subfamily B Member 1 (ABCB1) gene. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Hypertension
- What is being tested?
- Genetic analysis and Losartan plazma level measurement
- How many people
- 100 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 23 Oct 2017to 15 Jan 2019
- How long will I take part?
- 1 Day
- Phase
- Observational
- Are there results?
- None posted in the registry
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 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Study population: . The patient group was comprised of 50 individuals presenting with a hypertensive episode (patients under 60, >140/90 mmHg, patients over 60, >150/90 mmHg, according to the JNC8 guidelines) while under losartan treatment. The control group, by contrast, included 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode.
Who may be able to join
- gave their informed consent
- received minimum 25 mg losartan daily for at least six weeks
Who cannot join
- refusal to participate in the study
- illiteracy
- pregnant or in lactation period
- hemodynamically unstable (mean arterial pressure <65mmHg)
- kidney transplantation
- liver failure (CHILD PUGH Class C and higher patients) or renal failure (GFR<60)
- taking anti-hypertensive drugs other than losartan
Trial locations and contacts
1 site in 1 country.
About this study
Official title: Investigation of MDR1 (Multi-Drug Resistance) Gene Polymorphism and Losartan Plasma Concentration in Patients Undergoing Hypertensive Episodes While Under Losartan Treatment: A Prospective, Case-Control Study
Losartan is an antihypertensive drug belonging to the ARB family. It is characterized as the substrate of the Multi Drug Resistance-1 (MDR1) drug-efflux protein (a pump that ensures the removal of drugs/foreign substances out of the cell) encoded by the ATP Binding Cassette Subfamily B Member 1 (ABCB1) gene. A recent line of evidence indicates that potential polymorphisms in this gene tend to alter the absorption, transport, bioavailability of losartan, and, indirectly, its effectiveness in hypertension control. As identified by new research, the C3435T, G2677T, and C1236T polymorphic alleles of the MDR1 gene might alter the bioavailability and thus the effectiveness of losartan
Read the detailed description
This trial was conducted in the emergency services of Gazi University and Pamukkale University. The patient group was comprised of 50 individuals presenting with a hypertensive episode (patients under 60, >140/90 mmHg, patients over 60, >150/90 mmHg, according to the JNC8 guidelines) while under losartan treatment. The control group, by contrast, included 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode. The eligible patients matching the inclusion and exclusion criteria were recruited for the study.
Within the scope of this research, we included hypertension patients over 18 who gave their informed consent for the study and received minimum 25 mg losartan daily for at least six weeks. 50 individuals admitted to the ED due to a hypertensive episode while under losartan treatment were assigned to the patient group, while 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode were included in the control group. Those who did not give their consent to participate and did not match the inclusion criteria were excluded from the scope of the study Prior to the trial, the participants were assessed based on the pre-defined patient selection criteria, and the non-eligible ones were excluded from the trial. These exclusion criteria can be listed as refusal to participate in the study, illiteracy, being under 18, being pregnant and in lactation period, being hemodynamically unstable (mean arterial pressure <65mmHg), undergoing kidney transplantation, having liver failure (CHILD PUGH Class C and higher patients) or renal failure (GFR<60), and taking anti-hypertensive drugs other than losartan(Figure 1).
Initially, 20 ml of blood was collected from the enrolled patients. 10 ml of blood was stored in the tubes with ethylene diamine tetraacetic acid (EDTA) until Deoxyribonucleic acid (DNA) isolation was performed at -20 degrees and plasma level was identified. The remaining 10 ml was centrifuged at 3500 rpm for 10 min, and the plasma was separated. The resulting plasmas were stored in the eppendorf tubes at -20°C until the tandem mass spectrometry measurement.
- Conditions
- Hypertension
- Being tested
- Genetic analysis and Losartan plazma level measurement
- Keywords
- Losartan, MDR1, Genetic polymorphism, EXP3174, Hypertension
- Medical subject headings
- Hypertension
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Genetic analysis and Losartan plazma level measurementDiagnostic test
20 ml of blood was collected from the enrolled patients. 10 ml of blood was stored in the tubes with ethylene diamine tetraacetic acid (EDTA) until Deoxyribonucleic acid (DNA) isolation was performed at -20 degrees and plasma level was identified. The remaining 10 ml was centrifuged at 3500 rpm for 10 min, and the plasma was separated. The resulting plasmas were stored in the eppendorf tubes at -20°C until the tandem mass spectrometry measurement. The blood samples in EDTA tubes were then transferred for DNA analysis. . To measure plasma losartan concentration, after the frozen plasma samples stored in the eppendorfs were thawed and brought to room temperature, plasma losartan and EXP3174 levels of the patients were calculated using tandem mass spectrometry
| Study group | Role | What they receive |
|---|---|---|
| Patients with Hypertensive episode | 50 individuals presenting with a hypertensive episode (patients under 60, >140/90 mmHg, patients over 60, >150/90 mmHg, according to the JNC8 guidelines) while under losartan treatment Receives: Diagnostic Test: Genetic analysis and Losartan plazma level measurement | |
| Patients with controlled hypertension | 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode. The eligible patients matching the inclusion and exclusion criteria were recruited for the study. Receives: Diagnostic Test: Genetic analysis and Losartan plazma level measurement |
What is being measured
The primary outcome is the main question the study is designed to answer.
MDR1 gene polimorphism does not influence losartan consantration nevertheless changes blood pressure lowering effect of losartan
50 patients receiving anti-hypertensive treatment with losartan, presenting to the ED with a hypertensive episode and 50 patients whose blood pressure was regulated while receiving losartan treatment and who presented to the ED for reasons other than hypertensive episode. Compare two groups losartan consantration and MDR1 gene polymorphyms
Measured: at least six weeks under losartan treatment
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted27 Apr 2022
- Study start23 Oct 2017
- Primary completion15 Jan 2019
- Study completion15 Jan 2019
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for HypertensionStudies of the same condition, open and under way.
- More trials run by Pamukkale UniversityThe 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
- Observational
- Observational model
- Case-control
- Time perspective
- Cross-sectional
- Enrolment
- 100 participants (actual)
- Target duration
- 1 Day
Sponsor and investigators
- Lead sponsor
- Pamukkale University
- Sponsor type
- University, hospital or other
- Collaborators
- Gazi University
- Responsible party
- Principal investigator, Üzeyir Çimen, Pamukkale University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05349825
- Sponsor's protocol ID
- 4921
- Status last verified
- Apr 2022
- First submitted
- 18 Apr 2022
- Last updated
- 27 Apr 2022
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided
Study at a glance
From the registry record, last updated by the sponsor on 27 Apr 2022. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Investigation of MDR1 (Multi-Drug Resistance) Gene Polymorphism and Losartan Plasma Concentration in Patients Undergoing Hypertensive Episodes While Under Losartan Treatment: A Prospective, Case-Control Study
- ClinicalTrials.gov ID
- NCT05349825
- Acronym / sponsor ID
- 4921
- Conditions
- Hypertension
- Keywords
- Losartan, MDR1, Genetic polymorphism, EXP3174, Hypertension
- Study type
- Observational
- Recruitment status
- Completed
- Enrolment
- 100 participants (actual)
- Lead sponsor
- Pamukkale UniversityUniversity, hospital or other
- Collaborators
- Gazi University
- Study start
- 23 Oct 2017 (actual)
- Primary completion
- 15 Jan 2019 (actual)
- Study completion
- 15 Jan 2019 (actual)
- First posted
- 27 Apr 2022 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Losartan is an antihypertensive drug belonging to the ARB family. It is characterized as the substrate of the Multi Drug Resistance-1 (MDR1) drug-efflux protein (a pump that ensures the removal of drugs/foreign substances out of the cell) encoded by the ATP Binding Cassette Subfamily B Member 1 (ABCB1) gene. A recent line of evidence indicates that potential polymorphisms in this gene tend to alter the absorption, transport, bioavailability of losartan, and, indirectly, its effectiveness in hypertension control. As identified by new research, the C3435T, G2677T, and C1236T polymorphic alleles of the MDR1 gene might alter the bioavailability and thus the effectiveness of losartan
Detailed description
This trial was conducted in the emergency services of Gazi University and Pamukkale University. The patient group was comprised of 50 individuals presenting with a hypertensive episode (patients under 60, >140/90 mmHg, patients over 60, >150/90 mmHg, according to the JNC8 guidelines) while under losartan treatment. The control group, by contrast, included 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode. The eligible patients matching the inclusion and exclusion criteria were recruited for the study.
Within the scope of this research, we included hypertension patients over 18 who gave their informed consent for the study and received minimum 25 mg losartan daily for at least six weeks. 50 individuals admitted to the ED due to a hypertensive episode while under losartan treatment were assigned to the patient group, while 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode were included in the control group. Those who did not give their consent to participate and did not match the inclusion criteria were excluded from the scope of the study Prior to the trial, the participants were assessed based on the pre-defined patient selection criteria, and the non-eligible ones were excluded from the trial. These exclusion criteria can be listed as refusal to participate in the study, illiteracy, being under 18, being pregnant and in lactation period, being hemodynamically unstable (mean arterial pressure <65mmHg), undergoing kidney transplantation, having liver failure (CHILD PUGH Class C and higher patients) or renal failure (GFR<60), and taking anti-hypertensive drugs other than losartan(Figure 1).
Initially, 20 ml of blood was collected from the enrolled patients. 10 ml of blood was stored in the tubes with ethylene diamine tetraacetic acid (EDTA) until Deoxyribonucleic acid (DNA) isolation was performed at -20 degrees and plasma level was identified. The remaining 10 ml was centrifuged at 3500 rpm for 10 min, and the plasma was separated. The resulting plasmas were stored in the eppendorf tubes at -20°C until the tandem mass spectrometry measurement.
Study design
- Observational model
- Case-control
- Time perspective
- Cross-sectional
- Target follow-up
- 1 Day
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Patients with Hypertensive episode | – | Diagnostic Test: Genetic analysis and Losartan plazma level measurement50 individuals presenting with a hypertensive episode (patients under 60, >140/90 mmHg, patients over 60, >150/90 mmHg, according to the JNC8 guidelines) while under losartan treatment |
| Patients with controlled hypertension | – | Diagnostic Test: Genetic analysis and Losartan plazma level measurement50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode. The eligible patients matching the inclusion and exclusion criteria were recruited for the study. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
- Study population
- . The patient group was comprised of 50 individuals presenting with a hypertensive episode (patients under 60, >140/90 mmHg, patients over 60, >150/90 mmHg, according to the JNC8 guidelines) while under losartan treatment. The control group, by contrast, included 50 patients whose blood pressure was regulated while receiving losartan treatment and who were admitted to the ED for reasons other than hypertensive episode.
Key inclusion criteria (2 listed)
- gave their informed consent
- received minimum 25 mg losartan daily for at least six weeks
Key exclusion criteria (7 listed)
- refusal to participate in the study
- illiteracy
- pregnant or in lactation period
- hemodynamically unstable (mean arterial pressure <65mmHg)
- kidney transplantation
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 |
|---|---|---|
| Genetic analysis and Losartan plazma level measurement20 ml of blood was collected from the enrolled patients. 10 ml of blood was stored in the tubes with ethylene diamine tetraacetic acid (EDTA) until Deoxyribonucleic acid (DNA) isolation was performed at -20 degrees and plasma level was identified. The remaining 10 ml was centrifuged at 3500 rpm for 10 min, and the plasma was separated. The resulting plasmas were stored in the eppendorf tubes at -20°C until the tandem mass spectrometry measurement. The blood samples in EDTA tubes were then transferred for DNA analysis. . To measure plasma losartan concentration, after the frozen plasma samples stored in the eppendorfs were thawed and brought to room temperature, plasma losartan and EXP3174 levels of the patients were calculated using tandem mass spectrometry | Diagnostic test | Patients with Hypertensive episode, Patients with controlled hypertension |
Primary outcome
MDR1 gene polimorphism does not influence losartan consantration nevertheless changes blood pressure lowering effect of losartan
Time frame: at least six weeks under losartan treatment
50 patients receiving anti-hypertensive treatment with losartan, presenting to the ED with a hypertensive episode and 50 patients whose blood pressure was regulated while receiving losartan treatment and who presented to the ED for reasons other than hypertensive episode. Compare two groups losartan consantration and MDR1 gene polymorphyms
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 27 Apr 2022.
- Individual participant dataSharing planned: Undecided
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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.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
An observational study of Hypertension, run by Pamukkale University at 1 site in Turkey (Türkiye).
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 7 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 27 Apr 2022. 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 Turkey (Türkiye). 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.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
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?
MDR1 gene polimorphism does not influence losartan consantration nevertheless changes blood pressure lowering effect of losartan (time frame: at least six weeks under losartan treatment). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 27 Apr 2022.