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The Effect of Intrathecal Morphine Dose on Outcomes After Elective Cesarean Delivery: A Meta-Analysis.
Anesth Analg. 2016 07; 123(1):154-64.A&A

Abstract

BACKGROUND

The intrathecal morphine dose achieving optimal analgesia for cesarean delivery while minimizing side effects has not yet been deduced. In this meta-analysis, our objective was to determine whether low- or high-dose intrathecal morphine provides acceptable duration and intensity of analgesia with fewer side effects.

METHODS

A literature search (PubMed, EMBASE, MEDLINE, Scopus, Web of Science, and CINAHL) was performed to identify randomized controlled trials involving patients undergoing elective cesarean delivery under spinal anesthesia comparing low-dose (LD; 50-100 μg) morphine with higher dose (HD; >100-250 μg). The primary outcome was the time for first request for supplemental analgesia. The secondary outcomes included pain scores, morphine use, maternal side effects (vomiting and pruritus), and Apgar scores. Mean differences (MDs) and odds ratios (ORs) were calculated using random effects modeling with 95% confidence intervals (CIs).

RESULTS

Eleven articles met our inclusion criteria. Four hundred eighty patients were recruited in all study groups (233 patients in the HD and 247 in the LD groups). The mean time to first analgesic request was longer (MD, 4.49 hours [95% CI, 1.85-7.13]; P = 0.0008) in the HD group compared with the LD group. Pain scores (0-100 scale) at 12 hours (MD, 2.54 [95% CI, -2.55 to 7.63]; P = 0.33) as well as morphine consumption at 24 hours (MD, 1.31 mg [95% CI, -3.06 to 7.31]; P = 0.42) were not significantly different. The incidence of nausea or vomiting (OR, 0.44 [95% CI, 0.27-0.73]; P = 0.002) and pruritus (OR, 0.34 [95% CI, 0.20-0.59]; P = 0.0001) was lower in the LD group. The incidence of Apgar scores <7 at 1 minute was not different between groups (OR, 1.11 [95% CI, 0.06-20.49]; P = 0.94).

CONCLUSIONS

This meta-analysis shows that HDs of intrathecal morphine prolong analgesia after cesarean delivery compared with lower doses. The MD of 4.5 hours (95% CI, 1.9-7.1 and 99% CI, 1.0-8.2 hours) of pain relief must be balanced against the increased risk of maternal pruritus and vomiting. Results from this study can be used by clinicians to weigh the benefits and potential side effects of using HDs of intrathecal morphine for cesarean delivery.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Sultan P
From the *Department of Anaesthesia, University College London Hospital, London, United Kingdom; †Department of Anesthesia, University of Toronto and Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada; ‡Department of Anaesthesia, St. Thomas' Hospital, London, United Kingdom; and §Department of Anesthesia, Stanford University School of Medicine, Stanford, California.
Halpern SH
No affiliation info available
Pushpanathan E
No affiliation info available
Patel S
No affiliation info available
Carvalho B
No affiliation info available

MeSH

Analgesia, EpiduralAnalgesia, ObstetricalAnalgesics, OpioidCesarean SectionChi-Square DistributionDose-Response Relationship, DrugElective Surgical ProceduresFemaleHumansMorphineOdds RatioPain MeasurementPain ThresholdPain, PostoperativePostoperative Nausea and VomitingPregnancyPruritusRisk AssessmentRisk FactorsTreatment Outcome

Pub Type(s)

Journal Article
Meta-Analysis
Review
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

27089000

Clinical Trial Links

Dexmedetomine as Adjuvant for Spinal Anesthesia in Elective Cesarian Sections : a Pilot Study

Citation

Sultan, Pervez, et al. "The Effect of Intrathecal Morphine Dose On Outcomes After Elective Cesarean Delivery: a Meta-Analysis." Anesthesia and Analgesia, vol. 123, no. 1, 2016, pp. 154-64.
Sultan P, Halpern SH, Pushpanathan E, et al. The Effect of Intrathecal Morphine Dose on Outcomes After Elective Cesarean Delivery: A Meta-Analysis. Anesth Analg. 2016;123(1):154-64.
Sultan, P., Halpern, S. H., Pushpanathan, E., Patel, S., & Carvalho, B. (2016). The Effect of Intrathecal Morphine Dose on Outcomes After Elective Cesarean Delivery: A Meta-Analysis. Anesthesia and Analgesia, 123(1), 154-64. https://doi.org/10.1213/ANE.0000000000001255
Sultan P, et al. The Effect of Intrathecal Morphine Dose On Outcomes After Elective Cesarean Delivery: a Meta-Analysis. Anesth Analg. 2016;123(1):154-64. PubMed PMID: 27089000.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The Effect of Intrathecal Morphine Dose on Outcomes After Elective Cesarean Delivery: A Meta-Analysis. AU - Sultan,Pervez, AU - Halpern,Stephen H, AU - Pushpanathan,Ellile, AU - Patel,Selina, AU - Carvalho,Brendan, PY - 2016/4/19/entrez PY - 2016/4/19/pubmed PY - 2017/6/27/medline SP - 154 EP - 64 JF - Anesthesia and analgesia JO - Anesth Analg VL - 123 IS - 1 N2 - BACKGROUND: The intrathecal morphine dose achieving optimal analgesia for cesarean delivery while minimizing side effects has not yet been deduced. In this meta-analysis, our objective was to determine whether low- or high-dose intrathecal morphine provides acceptable duration and intensity of analgesia with fewer side effects. METHODS: A literature search (PubMed, EMBASE, MEDLINE, Scopus, Web of Science, and CINAHL) was performed to identify randomized controlled trials involving patients undergoing elective cesarean delivery under spinal anesthesia comparing low-dose (LD; 50-100 μg) morphine with higher dose (HD; >100-250 μg). The primary outcome was the time for first request for supplemental analgesia. The secondary outcomes included pain scores, morphine use, maternal side effects (vomiting and pruritus), and Apgar scores. Mean differences (MDs) and odds ratios (ORs) were calculated using random effects modeling with 95% confidence intervals (CIs). RESULTS: Eleven articles met our inclusion criteria. Four hundred eighty patients were recruited in all study groups (233 patients in the HD and 247 in the LD groups). The mean time to first analgesic request was longer (MD, 4.49 hours [95% CI, 1.85-7.13]; P = 0.0008) in the HD group compared with the LD group. Pain scores (0-100 scale) at 12 hours (MD, 2.54 [95% CI, -2.55 to 7.63]; P = 0.33) as well as morphine consumption at 24 hours (MD, 1.31 mg [95% CI, -3.06 to 7.31]; P = 0.42) were not significantly different. The incidence of nausea or vomiting (OR, 0.44 [95% CI, 0.27-0.73]; P = 0.002) and pruritus (OR, 0.34 [95% CI, 0.20-0.59]; P = 0.0001) was lower in the LD group. The incidence of Apgar scores <7 at 1 minute was not different between groups (OR, 1.11 [95% CI, 0.06-20.49]; P = 0.94). CONCLUSIONS: This meta-analysis shows that HDs of intrathecal morphine prolong analgesia after cesarean delivery compared with lower doses. The MD of 4.5 hours (95% CI, 1.9-7.1 and 99% CI, 1.0-8.2 hours) of pain relief must be balanced against the increased risk of maternal pruritus and vomiting. Results from this study can be used by clinicians to weigh the benefits and potential side effects of using HDs of intrathecal morphine for cesarean delivery. SN - 1526-7598 UR - https://www.unboundmedicine.com/medline/citation/27089000/The_Effect_of_Intrathecal_Morphine_Dose_on_Outcomes_After_Elective_Cesarean_Delivery:_A_Meta_Analysis_ DB - PRIME DP - Unbound Medicine ER -