Users Online: 1025 Home Print this page Email this page Small font sizeDefault font sizeIncrease font size  
Home | About us | Editorial board | Search | Ahead of print | Current issue | Archives | Submit article | Instructions | Subscribe | Contacts | Login 


RSACP wishes to inform that it shall be discontinuing the dispatch of print copy of JOACP to it's Life members. The print copy of JOACP will be posted only to those life members who send us a written confirmation for continuation of print copy.
Kindly email your affirmation for print copies to dranjugrewal@gmail.com preferably by 30th June 2019.

 

 
Table of Contents
LETTER TO EDITOR
Year : 2019  |  Volume : 35  |  Issue : 2  |  Page : 276

Use of ropivacaine 0.2% with or without clonidine 1 μg/kg for epidural labor analgesia


Department of Anaesthesiology, King George's Medical University, Lucknow, Uttar Pradesh, India

Date of Web Publication25-Jun-2019

Correspondence Address:
Hemlata
Type IV/3, SGPGI Campus, Lucknow - 226 014, Uttar Pradesh
India
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/joacp.JOACP_122_18

Rights and Permissions

How to cite this article:
Hemlata. Use of ropivacaine 0.2% with or without clonidine 1 μg/kg for epidural labor analgesia. J Anaesthesiol Clin Pharmacol 2019;35:276

How to cite this URL:
Hemlata. Use of ropivacaine 0.2% with or without clonidine 1 μg/kg for epidural labor analgesia. J Anaesthesiol Clin Pharmacol [serial online] 2019 [cited 2019 Dec 7];35:276. Available from: http://www.joacp.org/text.asp?2019/35/2/276/261275



Madam,

I read with great interest the recent study by Kumari et al.[1] “Comparison of ropivacaine (0.2%) with or without clonidine 1 μg/kg for epidural labor analgesia: A randomized controlled study.” I sincerely appreciate the efforts taken by the authors in designing, conducting, and reporting their study. However, there seems to be a major flaw in the methodology of their study with respect to the preparation of study drugs. According to the authors, they had drawn 3 ml of 0.5% ropivacaine in a 10 ml syringe and added 7 ml of saline to obtain 10 ml of 0.2% ropivacaine solution for Group R patients. Similarly, for Group RC patients, the solution was prepared by adding 1 μg/kg of a 100 μg/ml solution of clonidine to 3 ml of 0.5% ropivacaine and injection normal saline q.s. 10 ml. So, in both the groups, the solution that they prepared, were in effect, 0.15% ropivacaine and not 0.2% ropivacaine, as claimed by them. Ideally, they should have taken 4 ml of 0.5% ropivacaine instead of 3 ml to get a final 10 ml of 0.2% solution of ropivacaine.

This article made an interesting read and illuminated us on a very important topic, however, because they had actually studied a different concentration of the drug in question, this might have a bearing on the interpretation of the study results.

The authors had concluded that the addition of clonidine 1 μg/kg to epidurally administered ropivacaine 0.2% improves the onset of analgesia, prolongs its duration, and is very well accepted by the parturients. Considering the fact that both 0.15% and 0.2% ropivacaine can be used for epidural labor analgesia (ELA)[2],[3] in routine clinical practice, and that the same concentration of ropivacaine was used in both the groups, this conclusion may still hold true. However, I have some reservations about their additional conclusion regarding the incidence of undesirable motor blockade, cesarean section/instrumental vaginal delivery, or neonatal depression. I wonder if the incidences of undesirable motor blockade or neonatal depression would still have been the same (and more importantly, acceptable) had they actually added 1 μg/kg of clonidine to 10 ml of 0.2% ropivacaine (20 mg) rather than to 0.15% ropivacaine (15 mg). Muir et al.[3] had reported a 21% incidence of motor block using 10 ml of 0.25% ropivacaine (25 mg). Greater incidences of motor block have been reported by Eddleston et al.[4] (25–37.5 mg ropivacaine) and McCrae et al.[5](50 mg ropivacaine), with figures as great as 65%. Authors of the present study have not mentioned the exact incidences of motor blockade in the two groups, they had only mentioned that the difference was not significant.

In conclusion, the authors actually compared ropivacaine (0.15%) with or without clonidine 1 μg/kg for ELA. Still they ended up concluding about ropivacaine 0.2% with or without clonidine 1 μg/kg for ELA, thus providing a false sense of assurance among practicing clinicians regarding the safety of use of clonidine (1 μg/kg) with 0.2% ropivacaine for ELA. Moreover, the relevant research question regarding the safety of adding clonidine 1 μg/kg to 0.2% ropivacaine for ELA with respect to undesirable motor blockade and neonatal depression still remains unanswered.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Kumari I, Sharma K, Bedi V, Mohan M, Tungaria H, Modi MK. Comparison of ropivacaine (0.2%) with or without clonidine 1 μg/kg for epidural labor analgesia: A randomized controlled study. J Anaesthesiol Clin Pharmacol 2018;34:18-22.  Back to cited text no. 1
[PUBMED]  [Full text]  
2.
Lee BB, Ngan Kee WD, Wong EL, Liu JY. Dose–response study of epidural ropivacaine for labor analgesia. Anesthesiology 2001;94:767-72.  Back to cited text no. 2
    
3.
Muir HA, Writer D, Douglas J, Weeks S, Gambling D, Macarthur A. Double-blind comparison of epidural ropivacaine 0.25% and bupivacaine 0.25%, for the relief of childbirth pain. Can J Anaesth 1997;44:599-60.  Back to cited text no. 3
    
4.
Eddleston JM, Holland JJ, Griffin RP, Corbett A, Horsman EL, Reynolds F. A double-blind comparison of 0.25% ropivacaine and 0.25% bupivacaine for extradural analgesia in labour. Br J Anaesth 1996;76:66-71.  Back to cited text no. 4
    
5.
McCrae AF, Jozwiak H, McClure JH. Comparison of ropivacaine and bupivacaine in extradural analgesia for the relief of pain in labour. Br J Anaesth 1995;74:261-5.  Back to cited text no. 5
    




 

Top
 
  Search
 
    Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
    Access Statistics
    Email Alert *
    Add to My List *
* Registration required (free)  

 
  In this article
   References

 Article Access Statistics
    Viewed294    
    Printed8    
    Emailed0    
    PDF Downloaded64    
    Comments [Add]    

Recommend this journal