Preconditioning for Aneurismal Subarachnoid Hemorrhage

Not Applicable

Completed

• Conditions: Subarachnoid Hemorrhage
• Interventions: Procedure: remote limb preconditioning

• Registration Number: NCT01110239
• Lead Sponsor: University of Miami

Brief Summary

In remote preconditioning, ischemia in one organ protects distant organs from ischemic insults. e.g. brief induced limb ischemia protects the brain from an otherwise more severe stroke.

The objective of this study is to determine if remote ischemic preconditioning can be safely and effectively instituted in patients with subarachnoid hemorrhage, who are at high risk for developing disabling cerebral ischemia. The investigators will also preliminarily assess if there is evidence for neuroprotection. This will be a Phase 1b study.

Additional objectives are:

1. to determine if remote ischemic preconditioning can be safely and effectively instituted in patients with subarachnoid hemorrhage, who are at high risk for developing disabling cerebral ischemia.

2. analogously to a dose-escalation study the investigators propose to study the safety and tolerability of increasing durations of limb ischemia until a target time of 10 minutes of limb ischemia has been reached.

Detailed Description

The investigators propose to study patients with subarachnoid hemorrhage, who generally have a high risk of ischemic stroke in the 2 weeks following the initial bleed, and patients with clipped or coiled aneurysm. The investigators will apply a blood pressure cuff around leg and use it to interrupt the circulation for 5-10 minutes. The investigators will repeat this for a total of 3 times every 24 to 48 hours up to 14 days. The cuff will be inflated for 5-10 minutes and then deflated for 5 minutes. There will be 3 cycles of this. The cuff will be inflated to 200mmHg.

The investigators will first start with 5 minutes of cuff inflation to either the arm or leg. The investigators will determine if this is safe in at least 6 patients. The investigators will then increase the duration of cuff inflation to 7.5 minutes for another 6 patients. If no adverse events are noted the investigators will the proceed to study 10 minutes of inflation in another 6 patients. If no side effects are noted the investigators will then determine that this is well tolerated.

The study will be monitored by a Data Safety Monitoring Board who will make decisions about escalating the duration of cuff inflation. If 2 or more patients develop an adverse event that is related to the procedure the investigators will stop and no longer continue at that level of cuff inflation and the previous level of cuff inflation will be determined to be the safe and tolerated level.

The investigators will collect safety data on adverse events such as tolerability, local tissue trauma or deep vein thrombosis.

Study Timeline

• Study Start: 2008-11
• Study First Submitted: 2010-04-21
• Study First Submitted QC: 2010-04-23
• Study First Posted: 2010-04-26
• Primary Completion: 2010-07
• Study Completion: 2010-07
• Results First Submitted: 2011-08-09
• Results First Submitted QC: 2013-01-31
• Results First Posted: 2013-03-11
• Status Verified: 2017-05
• Last Update Submitted: 2017-05-05
• Last Update Posted: 2017-06-09

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 34

Inclusion Criteria

aneurismal subarachnoid hemorrhage

Exclusion Criteria

1. Hunt Hess Scale > 4
2. Inability to undergo limb preconditioning due to local wound or tissue breakdown, history of peripheral extremity vascular disease or patient discomfort.
3. Inability to obtain informed consent from the patient or a health care proxy.
4. Ankle-brachial index < 0.7
5. Inability to start limb preconditioning within 4 days of bleeding.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
remote limb preconditioning	remote limb preconditioning	Subjects with subarachnoid hemorrhage will undergo escalating times of limb ischemia to determine tolerability and safety. The leg will be made transiently ischemic with application of a blood pressure cuff for up to 3 cycles of 10 minutes.

Primary Outcome Measures

Name	Time	Method
Visual Analog Scale Score as a Measure of Tolerability	90 days	The visual analogue scale is a pain scale from 0-10, with 10 being maximum pain and is frequently used in research studies assessing patient discomfort.
Number of Patients With Deep Vein Thrombosis for Safety Assessment.	90 days