Capsaicin for Cerebral Perfusion Augmentation

NCT ID: NCT05543837

Last Updated: 2023-03-14

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 20 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2022-09-20
• Study Completion Date: 2023-02-28

Brief Summary

To determine the effect of capsaicin upon serial transcranial Doppler (TCD) markers of cerebral blood flow (CBF). Methods Serial TCD testing in 30 participants with cerebrovascular risk factors. Capsaicin doses .66 and .99 μMol. Outcomes: peak systolic and end-diastolic velocities in the middle cerebral artery (MCA), mean velocity (MV), pulsatility index (PI), CBF index, arterial pressure, and perceived pungency (PP) in five minutes intervals up to 20 minutes.

Detailed Description

Subjects The study is expected to enroll 30 participants who will be recruited from the Internal Medicine outpatient clinic. Those willing to participate will be asked to sign the informed consent form (ICF) and will received the assigned dose of capsaicin. Half of the participants in each dose group will receive stimulation on either left or right side of the palate, but TCD measurements will be bilateral. Chemical stimuli From an initial 0.1% capsaicin (Sigma-Aldrich, St. Louis, MO) stock solution in 95% ethanol; solutions with 66 and 99 μMol/ml solutions will be obtained by diluting the stock solution with distilled water. One milliliter of each dilution was pipetted on to 2 cm filter paper squares. Then, the filter papers will be let dry. Immediately before application, filter papers will be rehydrated with 1 milliliter of distilled water. The rehydrated filter paper will be applied and will remain stationary on the subject's hemi palate's posterior surface during TCD measurements. Participants will be instructed not to swallow and to avoid touching the paper filter with their tongue for the 20 minutes of the experiment.

TCD testing With a TCD device (Philips Sonos 7500®) will include: peak systolic velocity (PSV) and end-diastolic velocity (EDV) in the middle cerebral artery (MCA) through the temporal window of the stimulated side. After a basal recording post stimulation recordings will initiate immediately after stimulation, and will be followed by serial recordings every five minutes and up to 20 minutes. At each time point the systolic pressure (SP), diastolic pressure (DP), and perceived pungency (PP) on a visual analog scale will be recorded. TCD markers of cerebral blood flow From the initial measurements the Mean velocity (MV) = EDV + [(PSVEDV) / 3], pulsatility index (PI) = PSV - EDV / MV, mean arterial pressure (MAP) = ((2 * DP) + SP) / 3 and, the CBF index (CBFi), CBFi = (MAP * 10) / 1.47^PI, will be calculated.

Statistical analysis Shapiro Wilkins W-Test for normality. The results of the continuous variables will be described as median (max-min) or mean+/- SD according to distribuition. The categorical variables will be described as tables of absolute and relative frequencies, and the comparisons between the groups of subjects (according to the dose of capsaicin) will be carried out with chi-square tests. To compare the variables studied between the groups of subjects (according to the different doses of capsaicin), Mann-Whitney U-Test/independent samples Student´s T-Test will be used appropriately. For comparisons of the baseline state with the changes recorded over time, various Wilcoxon signed-rank tests will be performed.The relationship between pungency ratings and MV response will be evaluated by Spearman's rho test. The level of statistical significance will be set at 0.05.

Conditions

Cerebral Circulatory Disorder

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: OTHER
• Blinding Strategy: NONE

Study Groups

Capsaicin .66μMol/ml

Group receiving .66μMol/ml

Group Type: EXPERIMENTAL

Capsaicin

Intervention Type: DRUG

Patients will receive a fixed dose of capsaicin

Capsaicin .99μMol/ml

Group receiving .99μMol/ml

Group Type: EXPERIMENTAL

Capsaicin

Intervention Type: DRUG

Patients will receive a fixed dose of capsaicin

Interventions

Capsaicin

Patients will receive a fixed dose of capsaicin

Intervention Type: DRUG

Other Intervention Names

8-Methyl-N-vanillyl-trans-6-nonenamide

Eligibility Criteria

Inclusion Criteria

• Signed Informed Consent Form
• Previous diagnosis and stable condition of one of the following:

Diabetes Mellitus Hypertension Dyslipidemia Chronic Obstructive Pulmonary Disease

Exclusion Criteria

• History of alergy or hypersensibility to dietary capsaicin
• Previous diagnosis of stroke
• Chronic use of cholinergic/anticholinergic drugs
• Chronic use of sympathomimetic drugs
• Chronic use of serotonergic drugs
• Chronic use of dopaminergic drugs

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Centenario Hospital Miguel Hidalgo

OTHER

Sponsor Role: collaborator

Instituto Mexicano del Seguro Social

OTHER_GOV

Sponsor Role: lead

Responsible Party

Juan Manuel Marquez Romero

Principal Investigator

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Juan M Marquez-Romero, MD, MSc

Role: PRINCIPAL_INVESTIGATOR

Unidad de Medicina de Alta Especialidad, Torre Medica CMQ

Locations

Centenario Hospital Miguel Hidalgo

Aguascalientes, , Mexico

Countries

Mexico

Other Identifiers

2022-E-20

Identifier Type: -

Identifier Source: org_study_id