Optimization of the Dose of Intrathecal Morphine in Total Hip Surgery

P Pu ur rp po os se e: : To determine the optimal dose of intrathecal morphine that produces satisfactory analgesia with minimum side effects in elderly patients undergoing transurethral resection of the prostate (TURP). M Me et th ho od ds s: :In this double-blind prospective study, 42 patients undergoing TURP with spinal anesthesia were allocated to one of three groups. Group A (n = 14) received tetracaine, 10 mg, alone. Group B (n = 13) and Group C (n = 15) received morphine 0.05 mg and 0.10 mg, respectively, in combination with tetracaine. Postoperative pain, nausea and pruritus were evaluated using visual analogue scales (VAS). SpO 2 and respiratory rate were also assessed.R Re es su ul lt ts s: : At three, five, seven and 24 hr after spinal anesthesia, the VAS scores for pain in Groups B and C were significantly less than in Group A. Group C experienced significantly greater VAS scores for pruritus as compared to Groups A and B. There was no significant difference in the intensity of nausea among the three groups. No patient experienced hypoxemia (SpO 2 < 90%) and respiratory depression (respiratory rate < 10 beats·min -1 ) in any group. C Co on nc cl lu us si io on n: : A dose of 0.05 mg in intrathecal morphine with spinal anesthesia would be optimal for elderly patients undergoing TURP. Objectif : Déterminer la dose optimale de morphine intrathécale pour obtenir une analgésie satisfaisante et le moins d'effets secondaires possibles chez des patients âgés devant subir la résection transurétrale de la prostate (RTUP). Méthode : L'étude prospective et à double insu comportait Résultats : À trois, cinq et 24 h après la rachianesthésie, les scores de douleur à l'EVA ont été significativement plus bas dans les groupes B et C que dans le groupe A. Dans le groupe C, les patients ont eu des scores de prurit significativement plus élevés que ceux des groupes A et B. Il n'y a pas eu de différence intergroupe significative quant à l'intensité des vomissements. Aucun patient n'a souffert d'hypoxémie (SpO 2 < 90 %) ou de dépression respiratoire (fréquence respiratoire < 10 respirations·min -1 ). Conclusion : Une dose de 0,05 mg de morphine intrathécale combinée à la rachianesthésie serait optimale chez des patients âgés qui subissent une RTUP.FTER transurethral resection of the prostate (TURP), patients often suffer from pain caused by detrusor muscle spasm. 1,2 Intrathecal morphine provides an excellent long-lasting analgesia and the addition of morphine to spinal anesthesia has been used for postoperative analgesia after many surgical procedures. [3][4][5][6][7][8][9][10] Cunningham et al. demonstrated that intrathecal morphine was effective for analgesia after TURP. 11 On the other hand, intrathecal morphine is often accompanied by adverse effects such as pruritus, nausea and respiratory depression. Clinicians tend to use smaller doses to reduce the incidence of adverse effects. This study was carried out to examine the efficacy and adverse effects associated with low-dose intrathecal morphine in patients undergoi...

Section: Méthode : L'étude Prospective Et à Double Insu Comportait 42mentioning

confidence: 99%

Section: Méthode : L'étude Prospective Et à Double Insu Comportait 42mentioning

confidence: 99%

Mini-dose (0.05 mg) intrathecal morphine provides effective analgesia after transurethral resection of the prostate

Sakai

Use

Shimamoto

et al. 2003

“…3 However, when used in large doses 3,4 and moderate doses (10 µg·kg -1 ) 5 ITM leads to delayed extubation. Lower doses of ITM have been used effectively for analgesia following Cesarean section (100 µg), 6 hip replacement surgery (100 µg) 7 and knee replacement surgery (300 µg). 8 There are reports of the use of lower doses of ITM (250 µg or 500 µg) as part of a fast-track approach in cardiac surgery, with no effect on extubation time (six to seven hours).…”

mentioning

confidence: 99%

Low dose intrathecal morphine facilitates early extubation after cardiac surgery: results of a retrospective continuous quality improvement audit

Parlow

Steele

O’Reilly

2005

P Pu ur rp po os se e: : To document one centre's experience with a multimodal analgesic approach, with or without low dose intrathecal morphine (ITM), in facilitating "fast-track" recovery in patients undergoing cardiac surgery.M Me et th ho od ds s: : Records of 131 consecutive patients who underwent first time elective cardiac surgery during a four-month period in 2000 were reviewed. Patients were divided into two groups: those receiving and those not receiving preoperative low dose ITM (< 5 µg·kg -1 ) as part of a multimodal analgesic technique. Demographic and surgical characteristics, postoperative morphine use, time to extubation and requirement for antiemetics were recorded. R Re es su ul lt ts s: : Overall, 75% of patients were extubated within two hours, and 93% within six hours. Fifty-five patients received, and 76 did not receive, ITM (mean ± SD 259 ± 53 µg) along with a multimodal analgesic technique (parasternal infiltration, acetaminophen and indomethacin, and postoperative iv morphine). Anesthetic technique involved modest dose opioids, volatile agent and propofol infusion. The groups were similar with respect to preoperative, intraoperative and anesthetic characteristics.Mean extubation time for fast-track patients receiving vs not receiving ITM was 75 ± 65 vs 117 ± 85 min (P = 0.003). Intravenous morphine use for the first 12 hr after surgery was also reduced in the ITM group (4.6 ± 4.1 vs 10.0 ± 14.8 mg, P = 0.009). There was no difference in rescue antiemetic or antipruritic requirements, failed fast-tracking, or serious adverse events.C Co on nc cl lu us si io on ns s: : Multimodal postoperative analgesia allowed for uneventful early extubation and low opioid requirements. Low dose ITM further facilitated early extubation, and reduced postoperative analgesic requirements. MIT (4,6 ± 4,1 vs 10,0 ± 14,8 mg, P = 0,009

“…The majority of this latter group defined RD with RR in conjunction with other variables, such as SpO 2 and ABGs. Six studies defined RD with both RR and ABGs, 8,14,20,74,103,109 while three used ABGs alone. 24,56,78 RR was the most common variable used to define RD.…”

Section: Discussionmentioning

confidence: 99%

Définitions de la “dépression respiratoire” de l’analgésie postopératoire réalisée avec de la morphine intrathécale : une revue documentaire

Goldstein

VanDenKerkhof

2003

108

P Pu ur rp po os se e: : To review the postoperative intrathecal morphine (ITM) analgesia literature for their definitions of "respiratory depression" (RD).S So ou ur rc ce e: : Medline (1966 -June Week 5 2001) and reference lists were searched for original studies involving bolus-dose ITM for postoperative analgesia, which used "respiratory depression" or similar terms. P Pr ri in nc ci ip pa al l f fi in nd di in ng gs s: : The search identified 209 studies. These were included if ITM use was appropriate (bolus dose, postoperative analgesia) and the term "respiratory depression" was used, which left 96 studies remaining. Forty-four (46%) did not define "RD" despite using this term. A further 24 (25%) defined RD with respiratory rate (RR) alone. Only 28 (29%) defined RD with more than RR alone. There was no statistically significant association between the presence of a definition for RD with study design, study size or publication period. Also, no significant association existed between rigorousness of RD definitions and the above factors.C Co on nc cl lu us si io on n: : The term "respiratory depression" has no clear definition from a review of the literature on ITM use for postoperative analgesia. While defining RD with bradypnea is superior to having no definition, this is still inadequate. In future research, the consistent use of terms with specific meanings will facilitate understanding the true incidence of ITM's respiratory effects. If "respiratory depression" is used, then an explicit definition of its meaning should be provided. Future research must also address what is clinically significant respiratory impairment from intrathecal opioids, and how to optimally monitor for this. Further delineating their risks vs benefits will allow for more optimal dosing. Objectif : Passer en revue les documents sur l'analgésie postopéra-toire, réalisée avec la morphine intrathécale (MIT), quant à leurs défi-nitions de la "dépression respiratoire" (DR). Source : La base Medline (1966 -Semaine 5, juin 2001) et les listes de lectures de référence ont été fouillées à la recherche d'études originales sur des bolus de MIT administrés comme analgésie postopéra-toire, et dans lesquelles on retrouve le terme "dépression respiratoire" ou des termes similaires. Constatations principales : La recherche nous a fourni 209 études. Les études (96) comportant un usage approprié de la MIT (dose en bolus, analgésie postopératoire) et l'utilisation du terme