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 Table of Contents  
ORIGINAL ARTICLE
Year : 2018  |  Volume : 8  |  Issue : 1  |  Page : 10-15

Effect of intraoperative anaesthetic management on patients' pain scores in post-anaesthesia care unit after caesarean section


Department of Anaesthesiology, Aga Khan University Hospital, Karachi, Pakistan

Date of Web Publication13-Apr-2018

Correspondence Address:
Dr. Samina Ismail
Department of Anaesthesiology, Aga Khan University Hospital, Karachi - 74800
Pakistan
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/joacc.JOACC_60_17

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  Abstract 


Objective: To determine the effect of intraoperative factors while using technique of anaesthesia and use of specific opioids on patients' pain score and need for first rescue analgesia in the post-anaesthesia care unit (PACU) after caesarean section (CS). Patients and Methods: This is a cross-sectional study on CS patients with 6 months collected data that include patients' demographics, surgical incision, duration of surgery, technique of anaesthesia, intraoperative use of specific opioids/co-analgesia, numerical rating score (NRS) and time of first rescue analgesia in the PACU. Results: Among 334 patients enrolled in the study, 7.2–13.3% had NRS >4 and required first rescue analgesia within the first hour in the PACU with 28 (8.4%) patients at time zero and 20 (6.0%) patients at 30 min in the PACU. There was no statistically significant difference among patients having NRS >4 from those having ≤4 in terms of the type of incision, American Society of Anaesthesiologist grading and duration of surgery. A statistically significant (P-value < 0.01) low pain scores in the initial 30 min in the PACU was observed in patients having surgery under regional anaesthesia (RA) compared to general anaesthesia (GA) and in patients receiving intraoperative intravenous (IV) morphine compared to nalbuphine or tramadol when operated under GA. Conclusion: The need for rescue analgesia during the initial 30 min in the PACU was less in patients undergoing CS under RA or receiving IV morphine under GA.

Keywords: Anaesthesia recovery, caesarean section, pain measurement, post-operative pain


How to cite this article:
Ismail S, Aman A, Hussain A. Effect of intraoperative anaesthetic management on patients' pain scores in post-anaesthesia care unit after caesarean section. J Obstet Anaesth Crit Care 2018;8:10-5

How to cite this URL:
Ismail S, Aman A, Hussain A. Effect of intraoperative anaesthetic management on patients' pain scores in post-anaesthesia care unit after caesarean section. J Obstet Anaesth Crit Care [serial online] 2018 [cited 2018 Oct 23];8:10-5. Available from: http://www.joacc.com/text.asp?2018/8/1/10/230069




  Introduction Top


Caesarean section (CS) is among the most commonly performed procedure and is known to induce moderate to severe pain for 48 h.[1] Literature reports an overall incidence of severe post-operative pain to be 11%.[2] Patients emerging from anaesthesia after surgery often wakeup with pain or discomfort due to inadequate intraoperative pain management in the operating room (OR).[3] Sensory signals generated due to tissue damage during surgery can trigger a prolonged state of increased excitability; therefore, therapeutic interventions should be made in advance of the pain than in reaction to it.[3]

One study revealed 69% of patients having moderate or severe pain on full recovery from anaesthesia in the post-anaesthesia care unit (PACU) compared to significantly less pain on discharge from the PACU.[4] Patients having moderate to severe pain immediately in the PACU indicates that intraoperative management was inadequate to control their pain when they emerged from anaesthesia in the PACU.

The proposed standard or target for best practice is 100% patients having a pain score of <4 on first awakening in the PACU after surgery, 100% patients should have a pain score of <4 within 30 min of first awakening in the PACU and 100% of patients should have a regular and breakthrough analgesia.[5]

Previous studies have addressed the issues of transitional pain care needs.[4],[6] However, the effect of intraoperative factors on patients' pain score in the PACU needs to be explored for the provision of better post-operative care.

The primary objective of the study is to determine whether there is an association between post-CS patient's PACU pain score and need for first rescue analgesia on intraoperative factors while using technique of anaesthesia [general anaesthesia (GA) or regional anaesthesia (RA)], intraoperative use of different types of intravenous (IV) opioids, surgical time, type of incision and patient grading using American Society of Anaesthesiologists (ASA). The secondary outcome is to observe the pain management in the PACU for post-CS patients.


  Patients and Methods Top


This cross-sectional study was done for a period of 6 months at a university hospital, which is a tertiary care centre with the approximate annual birth rate ranging from 3500 to 5000. In this institution, RA in the form of spinal anaesthesia is the technique of choice for majority (80%) of CS. Hyperbaric bupivacaine 9–12 mg is used in combination with fentanyl in the dose of 0.15–0.25 mg for induction of spinal anaesthesia. Because preservative-free long-acting intrathecal opioids like morphine is not available in the investigator's country, patients receiving RA get short-acting intrathecal fentanyl with local anaesthetic. When GA is used as a technique of anaesthesia for CS, IV opioids are used for intraoperative analgesia. However, the type of IV opioids used is either at the discretion of primary anaesthesiologists or on the availability of opioids. Intraoperative use of co-analgesia in the form of IV paracetamol, diclofenac suppository or transverses abdominus plane (TAP) block are also used for both spinal anaesthesia and GA at the discretion of primary anaesthesiologists. All patients either receiving GA or spinal anaesthesia for CS receive IV tramadol infusion for post-operative pain control, which is started either at the request for first analgesia in the PACU or at 60 min, whichever comes first. Patients are assessed for pain using numerical rating scale (NRS) immediately in the PACU and at regular intervals. Any patient having NRS >4 is given rescue analgesia. The opioid used in the PACU is IV tramadol, both for post-operative infusion and for rescue analgesia. The institution policy for patients having a working labour epidural in place and coming for emergency CS is to initially give a bolus of 10 ml of 2% xylocaine followed by titrated doses of 0.5% bupivacaine (maximum 10 ml) till a block of thoracic level between T5 and T6 is achieved as assessed by loss of temperature sensation. These patients in the PACU and in the ward for the next 12 h are given as an infusion of local anaesthetic and fentanyl (bupivacaine 0.1% with fentanyl 2 μg per ml of local anaesthetic solution). For rescue analgesia, these patients are given boluses of local anaesthetics from the epidural catheter.

After approval from Hospital Ethics Committee, patients fulfilling our inclusion criteria and about to undergo either elective or emergency CS under GA or spinal anaesthesia were approached for the written informed consent to participate in this observational study. Patients were explained the purpose of the study and all consenting patients were enrolled in the study. We excluded patients who did not consent to be a part of the study, who were suffering from chronic pain or mental illness, had history of substance abuse, language barrier, operated for morbidly adherent placenta, unable to communicate with the nursing staff or operated for CS under already placed labour epidural as their pain management regime was different from patients receiving GA or spinal for CS. Data were collected by a designated research assistant or nurses from acute pain management services, which were trained by the primary investigator to fill the data collection sheet, from the anaesthesia record form, nursing notes, post-operative notes and observation of nursing and anaesthesia pain assessment and management in the PACU. A predesigned data collection sheet was used to collect the data, which included patients' demographics, American Society of Anaesthesiologist (ASA) classification, type of incision (vertical midline or pfannenstiel), surgical time, type of anaesthesia, type of intraoperative opioid and co-analgesia used in the OR. The PACU parameters for data collection included NRS at time zero, then at 30, 45 and 60 min and time to first rescue analgesia and time taken to reach the score of <4 after rescue analgesia and occurrence of any side effects. All patients were followed throughout their stay in the PACU.

Patients were informed regarding the assessment of pain score using NRS from 0 to 10, where 0 is no pain and 10 is the worst possible pain. In addition, mild pain was taken as NRS of 0–3, moderate as NRS from 4 to 6 and severe as NRS from 7 to 10. Side effects assessed were sedation, nausea, vomiting, pruritus, respiratory depression and low oxygen saturation of <94%.

Following score were used for assessment of side effects:

Sedation (0 = no sedation, 1 = drowsy, easily roused, 2 = somnolent, difficult to rouse)

Nausea + vomiting (0 = none, 1 = mild, 2 = severe)

Pruritus (0 = none, 1 = yes)

Statistical analysis

Data were analysed using the Statistical Package for the Social Sciences (SPSS) version 19.0 (SPSS Inc., Chicago, Illinois, USA). For quantitative variables (age, weight, height and pain scores), means and standard deviations will be computed and analysed by independent sample t-test and Mann–Whitney U-test. Frequency and percentages were computed for qualitative data and analysed by Chi-square and Fisher's exact test. A P value of ≤ 0.05 was treated as significant.


  Results Top


During our study period from July to December 2015, there were 389 patients operated for CS in the OR of labour room suite. There were 352 patients who fulfilled our inclusion criteria and were approached for consent, out of which 334 consented and were enrolled in the study and assessed in the PACU. The demographic characteristics including the ASA status, mode of admission, type of anaesthesia, type of incision (vertical midline or pfannenstiel) and surgical time are shown in [Table 1]. The first assessment in the PACU was done immediately (time = 0 min) and was repeated at 30, 45 and 60 min [Table 2]. None of the patients stayed beyond 120 min in the PACU. Percentage of patients having NRS >4 and who required rescue analgesia on immediate assessment (time zero) was 28 (8.4%). After that, 20 patients (6.0%) at 30 min, 12 (3.6%) patients at 45 min and 6 (1.8%) patients at 60 min had NRS of >4 and required first rescue analgesia. There was no statistically significant difference among patients in PACU having NRS >4 from those having NRS <4 in terms of the type of incision, ASA grading and duration of surgery.
Table 1: Patients' demographic, ASA status, mode of admission and type of anaesthesia

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Table 2: Assessment of pain with NRS at different time intervals in the PACU, use of rescue analgesia, time taken for the pain score to reach >4 and number of patients having complications

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According to the institution, PACU protocol of any patient having NRS >4 received rescue analgesia. The results of this study revealed that all patients having NRS >4 received rescue analgesia (I/V tramadol bolus 1 mg/kg) which took 3–15 min for NRS to become <4 [Table 2]. Infusion of I/V tramadol was started following the first rescue analgesia and if the patient did not require any rescue analgesia it was started at 60 min. None of the patients at any time in PACU were reported to have sedation score of>2, respiratory rate of <10 or drop in saturation to <94%. There were eight patients (2.39%) who had nausea and vomiting score of 1 and two patients (0.6%) who complained of pruritus. All patients were treated according to the PACU protocol and did not require further intervention.

Comparison between technique of anaesthesia and time for the need of first rescue analgesia is shown in [Table 3]. Patients receiving RA had a statistically significant (P-value < 0.01) low percentage of patients with NRS >4 and need for first rescue analgesia at time zero and at 30 min when compared to the percentage of patients operated under GA [Table 3]. The difference became insignificant after 30 min.
Table 3: Comparison between technique of anaesthesia and time for the need of first rescue analgesia

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Patients operated under GA were given IV opioids after delivery of baby at the time of cord clamping. Nalbuphine (1 mg/kg) was the most commonly used IV opioid followed by tramadol (1 mg/kg) and morphine (0.1 mg/kg). Patients receiving nalbuphine and tramadol had statistically significant higher mean pain score (P-value <0.01) on immediate assessment and at 30 min assessment in the PACU compared to patients receiving morphine. However, no difference was observed on subsequent assessments after receiving rescue analgesia and when tramadol infusion was started.

Overall, 17% (57/334) of patients received some sort of co-analgesia, mainly in the form of IV paracetamol (16%, 55/334) and only two patients received TAP block. It was observed that out of 57 patients receiving co-analgesia, majority had received GA (75.4%, 43/57) as compared to RA (24.6%, 14/57).


  Discussion Top


This study provides information about the effect of intraoperative factors on PACU pain scores as patients were shifted from OR to PACU. The results of this study showed that patients having moderate to severe pain after CS in PACU on immediate assessment was 8.4%. A study from Nigeria has reported a much higher percentage of their patients experiencing some degree of pain in the immediate post-operative period with 79.6% reporting severe pain following CS.[7] Another study by al-Hassan et al. revealed a 69% of patients having moderate or severe (VAS ≥4) on immediate recovery from anaesthesia in the PACU but having a significantly less pain on discharge from PACU.[4] The results from our study and other quoted in the literature [4],[7] contrasts with the Audit Commission's (UK) recommendation of <5% of patients should experience severe post-operative pain [8] and also with the proposed standard of target for best practice recommending 100% patients to have a pain score of <4 on first awakening and within 30 min of first awakening in the PACU.[5]

Immediate pain in the recovery can be due to intraoperative factors leading to inadequate pain control when patients are first assessed in the PACU and subsequent pain scores on overall pain management in the PACU. However, researchers examining pain management have focused on specific stages of patient care,[6],[9] which often did not include intraoperative factors which may have an association on pain scores in PACU after abdominal surgery like CS. Factors such as technique of anaesthesia, type of opioids used in the OR, use of co-analgesia in the OR, type of incision, surgical time duration, ASA grading and overall pain assessment and use of rescue analgesia in the PACU may explain the gap between the standards set by Joint Commission Accreditation of Healthcare Organization of uniformly low pain score and those reported in the literature.

Previous literature has shown an association with type of surgical incision and severity of pain,[10] however, this study did not observe any statistically significant difference in the severity of pain as assessed by NRS scoring in terms of the type of incision. The probable reason could be unequal numbers in two groups as pfannenstiel incision was the commonly used incision (91%) versus midline vertical incision (9%) in this study. For the same reason, no statistically significant difference was observed in the pain scores in terms of duration of surgery and ASA grading as 97.3% of CS were done within 90 min and 91.6% belonged to ASA1 and 11 category.

Considering technique of anaesthesia, a statistically significant difference (P < 0.01) in the number of patients having NRS >4 at time zero and at 30 min receiving RA and GA for CS was observed. The percentage of patients receiving RA, having NRS >4 was significantly low compared to patients operated under GA in the initial 30 min in PACU. Our findings are consistent with previous studies that have shown lower pain scores for patients receiving RA.[11] However, difference between percentage of patients having moderate to severe pain after 45 min became statistically insignificant between GA and RA. The most probable reason could be the short duration of intrathecal fentanyl used in all cases done under RA. A study by Naghibi et al. revealed lower pain scores in the first 6 h post-operatively for patients operated under RA, but after that there were no significant differences between RA and GA regarding post-operative pain scores.[12] Another study by Tyritziz et al. has found the lasting effect of analgesic effect of RA for up to 2 h.[13] The difference in the lasting effect of RA can be due to the use of long-acting intrathecal opioid-like morphine, which was used in the study by Naghibi et al. and not by the Tyritziz et al.[12],[13]

Addition of intrathecal fentanyl to local anaesthetic to potentiate the effect of subarachnoid block is a widely used practice.[14],[15] However, the analgesic effect of intrathecal fentanyl lasts for about 30 min with an elimination half-life of 1.5–6 h.[16] The same effect is observed in this study where the analgesic effect seemed to decline, as difference between frequency of patients with NRS >4 between GA and RA became insignificant at 45 min. In a randomized trial comparing intrathecal morphine with intrathecal fentanyl and a combination of intrathecal morphine and fentanyl, the quality of post-operative analgesia with fentanyl, when used alone, was found to be inferior to that with morphine. The investigators concluded that the combination of opioids offered no advantage over morphine alone in management of post-caesarean pain.[17]

Similarly, Dahl et al. found a clinically relevant reduction in severity of post-operative pain and analgesic consumption with the use of intrathecal morphine when compared to other intrathecal opioids in patients undergoing caesarean section with spinal anaesthesia.[18] McMorrow et al. found that the pain scores and analgesia requirements after CS were lowest in those receiving spinal morphine 100 μg.[19] One survey from United States indicated that majority (77%) of respondents used intrathecal morphine.[20] However, availability of preservative-free intrathecal morphine is a major issue in developing country like the one in which this study was conducted.

In this study, intraoperative co-analgesia was used in only 17% (57/334) patients. The most common intraoperative co-analgesia used was IV paracetamol. A study done by Ozmete et al. on the efficacy of pre-operative paracetamol in patients undergoing CS under RA found that additional analgesic requirements were significantly lower in patients receiving IV paracetamol 15 min before induction of anaesthesia compared to the control group in the first post-operative hour.[21] The results of our study showed that majority of the patients receiving IV paracetamol had received GA (75.4%). These patients despite being given IV paracetamol had higher pain scores compared to patients receiving RA.

TAP block was used in only two patients who received RA. These two patients had NRS <4 beyond 60 min in PACU. One systemic review published on the use of TAP block in CS patients showed significantly improved post-operative analgesia in women undergoing CS who did not receive intrathecal morphine but showed no improvement in those who did receive intrathecal morphine.[22] The use of TAP block is therefore a valuable option for developing countries where availability of intrathecal morphine is an issue.

When investigating IV analgesics administered in the OR for patients operated under GA, nalbuphine was found to be the most commonly used IV opioid followed by tramadol and morphine. Patients receiving nalbuphine and tramadol had statistically significant higher mean pain score (P-value < 0.01) on immediate assessment and at 30 min assessment in the PACU compared to patients receiving morphine; however, no difference was found beyond this time. One meta-analysis has shown comparable analgesic efficacy of nalbuphine to other opioids.[23]

Pain management does not only vary between hospitals but also between wards within the same hospitals.[24] PACU is a very critical area where pain needs to be assessed and managed properly. A number of studies report not only pain intensity but also pain relief in terms of “escape criteria,” which is the need and delivery of rescue analgesia.[2] The results of this study revealed that all patients having NRS of >4 received rescue analgesia which took 3–15 minutes for NRS to become <4.

One of the limitation of our study is that there is wide difference in the number of patients operated under GA (19.8%) compared to RA (80.2%) making the comparison less valid. However, this was an observational study done over a time period, where the number of patients operated under different techniques cannot be controlled.


  Conclusion Top


This study showed that in patients undergoing CS under RA, the need for rescue analgesia was less compared to patients operated under GA in the initial 30 min in PACU. In addition, patients who were operated under GA and received IV morphine as intraoperative analgesia had better pain scores compared to patients receiving nalbuphine or tramadol. The overall pain management in the PACU was adequate as all patients were given rescue analgesia if they had NRS of >4 and no patient was shifted from PACU with NRS of >4. However, pain management was not adequate in terms of patient's immediate pain scores in PACU according to the Audit Commission's (UK) recommendation.

Recommendations

Therefore, our recommendation is to use RA as the technique of choice for CS and supplement it with the regular use of intraoperative co-analgesia such as IV paracetamol and TAP block, especially in countries where good quality IV opioids and intrathecal long-acting opioids are not available.

Acknowledgments

The authors wish to acknowledge the support and assistance of Nazia Maqsood, Senior Research Assistant in data collection, Syed Amir Raza, Research Coordinator, in data analysis and Asma Faraz, Associate, Department of Anaesthesiology, Aga Khan University for editing the manuscript.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

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Bonnet MP, Mignon A, Mazoit JX, Ozier Y, Marret E. Analgesic effect and adverse effects of epidural morphine compared to parenteral opioids after elective caesarean section: A systemic review. Eur J Pain 2010;14:894-9.  Back to cited text no. 1
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al-Hassan M, Alkhalil MS, al Ma'aitah R. Jordanian nurses' role in the management of postoperative pain in the post anesthesia care unit. J Perianesth Nurs 1999;14:384-9.  Back to cited text no. 4
    
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    Tables

  [Table 1], [Table 2], [Table 3]



 

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