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Year : 2013  |  Volume : 57  |  Issue : 1  |  Page : 93-94  

Author's reply

Department of Anaesthesiology and Intensive Care, GianSagar Medical College and Hospital, Ram Nagar, Banur, Punjab, India

Date of Web Publication14-Mar-2013

Correspondence Address:
Sukhminder Jit Singh Bajwa
Department of Anaesthesiology and Intensive Care, GianSagar Medical College and Hospital, House No 27-A, Ratan Nagar, Tripuri, Patiala, Punjab
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Source of Support: None, Conflict of Interest: None

PMID: 23716785

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How to cite this article:
Bajwa SS, Kaur J, Singh G, Kulshrestha A, Gupta S, Sharma V, Singh A, Parmar S S. Author's reply. Indian J Anaesth 2013;57:93-4

How to cite this URL:
Bajwa SS, Kaur J, Singh G, Kulshrestha A, Gupta S, Sharma V, Singh A, Parmar S S. Author's reply. Indian J Anaesth [serial online] 2013 [cited 2021 Aug 3];57:93-4. Available from: https://www.ijaweb.org/text.asp?2013/57/1/93/108591


It is always nice to receive the constructive criticism of one's research work that can open new avenues for further improvement in medical sciences. It is also matter of honor that the concerns have been expressed by the readers. [1]

To begin with, it should be clear to the concerned readers that this study was mainly focused on attenuation of stress response to laryngoscopy and intubation and not just merely to a decreased response to skin incision as has been cited in all the references in their communication. [2] In the various references, they have mentioned the MAC values of isoflurane required for prevention of response to skin incision and a wait for equilibration of end-tidal and alveolar levels for achieving such a response. How will you wait for equilibration with face-mask ventilation after induction of anaesthesia to achieve attenuation of stress response to laryngoscopy and intubation? The readers are solely concerned with intraoperative events rather than the most important part of anaesthesiology practice, that is, laryngoscopy and intubation to secure airway.

In one of the mentioned articles, the MAC values of isoflurane were decreased by the use of concomitant fentanyl 1.5 μg/kg. [3] Further, it has also been stated in the study that doubling the dose of opiates has a ceiling effect with no further decrement effect on the concentration of inhalational anaesthetics. It is very clearly mentioned in the present study in the Material and methods section that the maximum concentration used for isoflurane was 1% which was 33% lesser than the maximum concentration used by the quoted study. [3] Also, no quoted study in the letter has attended the issues of stress response to laryngoscopy and intubation, which was the main nucleus of our study. The concerned readers should be aware of the potential actions of dexmedetomidine when used through various routes or even as premedicant or pre-operatively as was used in the present study. The central actions of dexmedetomidine are largely responsible for decreasing the dose of anaesthetics and analgesics which can help in the titration as well as achieving the desired clinical effects (attenuation of stress response in the present study) at a lower dose of anaesthetics and analgesics thus avoiding side effects due to higher dosages. [1],[4] The model of comparison of the quoted studies does not match exactly with the present study.

It is invariably implied that all type of surgeries using inhalational anaesthetics in modern day anaesthesiology practice uses circle absorber system unless and until specified. Monitoring of end-tidal CO 2 has huge significance during maintenance phase of anaesthesia after intubation. In the present study, continuous monitoring of EtCO 2 was done but no significant findings were observed as compared to pulse oximetry that showed significant variations pre-operatively. Therefore, it was not considered necessary to occupy a larger space in the journal by an insignificant clinical finding. The concerned readers should have given a better example than the study of Elam et al. which was published more than 56 years ago in 1956 and is not relevant in the present day anaesthesiology practice. [5] Besides the stress response, all other findings and outcomes were secondary results and hence cannot be considered important to give priority over the primary aim of the study. Every study may have a number of confounding variables which may mask some of the reliability of the statistical results and significance. However, in the present study, the mentioned confounding variables are merely physiological

postulates and they are relevant only to a smaller extent to the methodology of our study as we intended to study the effect on stress response primarily and not the response to skin incision alone. It could have been significantly helpful for future references and improvement had the concerned readers compared our study with other studies of similar models and methodology.

   References Top

1.Bajwa SS, Kaur J, Singh A, Parmar SS, Singh G, Kulshrestha A, et al. Attenuation of pressor response and dose sparing of opioids and anaesthetics with pre-operative dexmedetomidine. Indian J Anaesth 2012;56:123-8.  Back to cited text no. 1
[PUBMED]  Medknow Journal  
2.White D. Uses of MAC. Br J Anesth 2003;91:167-9.  Back to cited text no. 2
3.Lee DJ, Robinson DL, Soni N. Efficiency of a circle system for short surgical cases: Comparison of desflurane with isoflurane. Br J Anaesth 1996;76:780-2.  Back to cited text no. 3
4.Bajwa SJ, Gupta S, Kaur J, Singh A, Parmar SS. Reduction in the incidence of shivering with perioperative dexmedetomidine: A randomized prospective study. J Anaesthesiol Clin Pharmacol 2012;28:86-91.  Back to cited text no. 4
[PUBMED]  Medknow Journal  
5.Elam JO, Brown ES. Carbon dioxide homeostasis during anesthesia. III. Ventilation and carbon dioxide elimination. Anesthesiology1956;17:115-27.  Back to cited text no. 5


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