About My Health Careers Internship MedBlogs Contact us

Local Anesthesia Effective in Venous Cannulas

by Anjali Aryamvally on October 15, 2017 at 1:33 PM
Font : A-A+

Local Anesthesia Effective in Venous Cannulas

Patients who are given a local anesthetic before inserting a cannula into the vein have reduced sensation of pain when larger gauge cannulas are used. Compared with intradermal lidocaine infusion, the use of vapocoolant spray has lower rate of venepuncture failures, says study led by Dirk Rüsch and coauthors from the Department of Anaesthesiology and Intensive Care Medicine, Philipps University of Marburg. The study is published in the Deutsches Ärzteblatt International.

Study Overview


Inserting a venous cannula is a routine procedure, which nonetheless can cause discomfort/stress for patients. Existing data show that local anesthesia to prepare the venepuncture site is standard treatment in children, but that this is handled rather less consistently in adults. In order to determine the effectiveness of local anesthesia when inserting a cannula into a vein on the dorsum of the hand, 450 adult inpatients at the University Hospital of Marburg were allocated to different treatment and control groups. After the first attempt at venepuncture, they were asked to score their subjective pain/discomfort caused by the procedure using an 11-point numerical rating scale (NRS; 0=no discomfort, 11=unbearable discomfort). After using vapocoolant spray, an average score of 2.4 for pain/discomfort showed a statistically significant improvement compared with the control group, with a score of 4.0). After lidocaine injection, the NRS score improved to 3.2 points, which was not considered as clinically relevant compared with the control group. If cannulas of 17 gauge or larger were used, the benefits of local anesthesia were even more easily measured on the pain scale: 2.6 points when vapocoolant spray was used, 3.5 for lidocaine, and 5.0 in the control group.

The authors interpret this as proof that local anesthetic preparation of the venepuncture site on the dorsum of the hand is indicated if a cannula of 17G or larger is being used. In their view, patients' scores were significantly and to a clinically relevant degree better after lidocaine injection as well as after vapocoolant spray application. If larger gauge cannulas were used, an even greater benefit of these interventions can be assumed, in the authors' opinion, whereas in smaller gauge cannulas (e.g. 20G) the subjective pain/discomfort was comparatively low. As the rate of failed puncture attempts is notably higher after lidocaine injection because of the intradermal welt, the authors recommend cooling anesthesia in peripheral venous cannulation as an at least equivalent alternative to lidocaine application.

Source: Eurekalert

News A-Z
News Category
What's New on Medindia
Contraceptive Pills in Polycystic Ovary Syndrome (PCOS) Curtail Type 2 Diabetes Risk
Mushroom May Help Cut Down the Odds of Developing Depression
How to Battle Boredom during COVID
View all

Medindia Newsletters Subscribe to our Free Newsletters!
Terms & Conditions and Privacy Policy.

More News on:
Dental Anesthesia Spinal and Epidural Anesthesia Local Anesthesia General Anesthesia Anaesthesia - History Anaesthesia - History and Origins Post operative Complications 

Recommended Reading
Biologic Therapies Receive FDA Clearance for Drillable Bone Marrow Cannulas
The bone marrow aspiration devices are minimally invasive, reduce fracturing to bone around the ......
Cardiac Assist’s Emergency Cannula PROTEK Duo Approved for European Market
PROTEK Duo is designed to overcome confines of mechanical ventilation, bypassing the lungs and ......
FDA Clears Alcyone MEMS Cannula for Injecting Therapeutic Agents Into Brain
Alcyone MEMS Cannula is intended for use in delivering gene therapy, therapeutic viruses, and other ...
Anesthesia can Pose a Danger to Kids Younger Than Three
Prolonged anesthesia exposure poses a possible threat to brain development in children under the ......
Anaesthesia - History
valuable information regarding the recent developments in the field of anesthesia ...
Anaesthesia - History and Origins
Anaesthesia has come a long way since the days of chloroform. It is much more safe today than it wa...
Dental Anesthesia
The advent of anesthesia may be regarded as a cornerstone in the development of modern dentistry....
General Anesthesia
General anesthesia is treatment with medications that induce a state of deep sleep and unconsciousne...
Local Anesthesia
Local anesthesia is a type of anesthesia generally used to block pain sensation only in a specific a...

Disclaimer - All information and content on this site are for information and educational purposes only. The information should not be used for either diagnosis or treatment or both for any health related problem or disease. Always seek the advice of a qualified physician for medical diagnosis and treatment. Full Disclaimer

© All Rights Reserved 1997 - 2021

This site uses cookies to deliver our services. By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use