Pulmonary Function and Interscalene Block

• Status: Completed
• Trial end date: 2016-02-01
• Target enrollment: 0
• Participant gender: All

Summary

The objective of our study is to compare the degree of phrenic nerve blockade after interscalene block using 0.1% ropivacaine or 0.2% ropivacaine. Our hypothesis is that using a lower concentration of local anesthetic will result in lesser degree of phrenic nerve block. 40 patients will be enrolled. Half will receive the block with 0.1% ropivacaine and half with 0.2% ropivacaine. Phrenic nerve and diaphragm function will be assessed by bedside spirometry and ultrasound visualization.

• Phase: N/A
• Accepts Healthy Volunteers?: No

Details

• Lead Sponsor: University of Pennsylvania
• Treatments: Ropivacaine

Criteria

Inclusion Criteria:

1. All patients scheduled for shoulder arthroscopy

2. ASA physical status between I-III

3. Mentally competent and able to give consent for enrollment in the study -

Exclusion Criteria:

1. Patients who are coagulopathic or currently on anticoagulation medication (except for ASA (acetylsalicylic acid) or NSAIDS)

2. Patients with severe pulmonary disease such as asthma or COPD or substantial smoking history suggestive of COPD

3. Patients with allergy to local anesthetics or other study drugs

4. Patients with chronic opiate use

5. Patients with known dysfunction of diaphragm, intercostal muscles, or other neuromuscular disorders affecting respiration

6. Inability to speak or understand English language