Orthostatic Hypotension
Conditions
Brief summary
The study is aimed to assess the efficacy of hand-grip in preventing orthostatic hypotension in 20 patients diagnosed with autonomic failure. Five healthy subjects will be studied for comparison. The investigators will evaluate the subjects while on tilt table for 10 minutes and than while mounted from lying down to 70 degrees for additional 10 minutes. Blood pressure, heart rate and symptoms will be continuously measured. First study will evaluate the blood pressure changes. Second measure will include hand-grip maneuver 1 minute before the erect positon. Trans cranial Doppler will assess the intracranial blood flow during the position changes.
Detailed description
Study 1: 10 minutes lying on the tilt table. Performing TCD study at 10 minutes. Raising the tilt table to 70 degrees. Performing TCD study 5 minutes after tilting. Measuring blood pressure and symptoms for 10 minutes. Returning the tilt bed to supine position. Study 2. in continue with study 1: 10 minutes lying on the tilt table. Performing TCD study at 10 minutes. Performing hand-grip at 50-70% grip force for 1 minute Raising the tilt table to 70 degrees. Performing TCD study 5 minutes after tilting. Measuring blood pressure and symptoms for 10 minutes. Returning the tilt bed to supine position.
Interventions
OTHERHand grip maneuver
Hand grip on blood pressue cuff slightly inflated at 50-70% of maximal force for 1 minute
Sponsors
Tel-Aviv Sourasky Medical Center
Study design
Allocation
NON_RANDOMIZED
Intervention model
SINGLE_GROUP
Primary purpose
PREVENTION
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
18 Years to 85 Years
Healthy volunteers
Yes
Inclusion criteria
* Man or women * 18 years of age or older * Diagnosed with orthostatic hypotension due to Parkinson's disease, multiple system atrophy or pure autonomic failure * Orthostatic hypotension is not due to drugs, any heart disorder, anemia or dehydration
Exclusion criteria
* Pregnant or breast feeding
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Change in orthostatic blood fall after tilting with and without hand grip. | 10 minutes after tilting the subjects. | Patients will be tilted to 70 degrees twice. Hand grip maneuver will be performed 1 minute before the second tilt study and the differences in blood pressure changes \[baseline-end tilt (mmHg)\] will be compared between the two studies and to those obtained from a healthy control group. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Change in the intracranial blood flow after tilting with and without hand grip. | 10 minutes after tilting. | Intracranial blood flow will be evaluated by transcranial doppler at baseline and after tilting. Differences will be compared \[peak systolic flow (PSW) cm/sec\], after tilting with and without prior hand grip and in comparison to tilting a control group. |
Countries
Israel
Outcome results
None listed