Merja Kokki MD, PhD Department of Anaesthesiology and Intensive Care, Kuopio University Hospital, School of Medicine, University of Eastern Finland
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1 Long-acting opioids in obstetric analgesia and the newborn Merja Kokki MD, PhD Department of Anaesthesiology and Intensive Care, Kuopio University Hospital, School of Medicine, University of Eastern Finland
2 Contents Placenta and placental drug permeability Tramadol Hydromorphone Oxycodone Morphine/diamorphine Opioid dependent mother Pharmacogenetics Closure
3 Take home message Opioids are moderately efficacious in labour pain Optimal doses and dosing time not known Pethidine use will/should decrease Oxycodone is a useful opioid in labour pain The drug effect on newborn must be followed
4 Placenta In humans: haemomonochorial placenta single layer of trophoblast tissue separates the mother's blood from the blood capillaries of the foetus
5 Placental drug permeability Passive diffusion concentration gradient lipid solubility flow dependent transfer Diffusion of ions as non-ionized base most of the opioids
6 Physicochemical properties of opioids Molecular weight pka base group Protein binding (%) Principal binding protein Morphine Albumin Pethidine AAG Methadone AAG Oxycodone Albumin Buprenorphine , - globulins
7 Drugs and the effects to the newborn Direct effects Placental transfer Indirect effects Maternal physiology and biochemistry
8 Equilibrium distribution across placenta ph gradient mother fetus Fetal plasma ph lower than maternal Free base concentrates to the fetal side (ion trapping) Acidotic fetus is exposed to basic drugs local anaesthetics and opioids
9 Equilibrium distribution across placenta Protein binding Fetal plasma protein content increases at term Albumin Little transplacental gradient α1-acid glycoprotein (AAG) Lower in fetus Binding higher in maternal than fetal side
10 Equilibrium distribution across placenta Equilibration takes longer time in fetus than in maternal tissue Fetal exposure is dependent on Blood flow Equilibrium ratios Duration of exposure
11 Pethidine, meperidine Maternal T½ 2-3 h, neonatal T½ 16-22h Active metabolites: norpethidine Crosses placenta slowly Fetal/matenal ratio does not correlate with dosedelivery interval Fetal effect at maximum 3 hours after maternal administration
12 Pethidine: adverse effects Fetal effects Reduced Muscular activity Aortic blood flow Oxygen saturation Short term heart rate variation Neonatal effects Depressed Apgar scores Respiration Neurobehavioural scores Muscle tone and suckling A detrimental effect on breastfeeding
13 The relationship between dose-delivery interval and neonatal urinary excretion of pethidine and norpethidine Kuhnert et al. 1979
14 Obstetric analgesia: a comparison of patient-controlled meperidine, remifentanil, and fentanyl in labour PCA Pethidine 50 mg loading, 5 mg bolus, lock out 10 min (n= 53) Remifentanil 40 µg loading, 40 µg bolus, lock out 2 min, max 1200 µg/h (n= 52) Fentanyl 50 µg loading, 20 µg bolus, lock out 5 min, max 240 µg/h (n=54) Douma et al. BJA 2010
15 Obstetric analgesia: a comparison of patientcontrolled meperidine, remifentanil, and fentanyl in labour * * p<0.05 when compared to the baseline
16 Effect of pethidine administered during the first stage of labor on the acid-base status at birth. Sosa et al. Eur J Obstet Gynecol Reprod Biol arterial blood cord samples Pethidine group Lower ph and bicarbonate levels higher pco 2 levels were found in the. ph < 7.12, OR: 8.59, 95% C.I. 3.29, The highest frequency of acidosis with pethidine-delivery interval 5 h.
17 Parenteral opioids for maternal pain relief in labour 54 studies, > 7000 women Poor quality of studies 2/3 women reported moderate/severe pain and poor/moderate pain relief after opioid treatment Ullman et al. 2010
18 Parenteral opioids for maternal pain relief in labour Opioids provide some pain relief Adverse effects drowsiness, nausea and vomiting Insufficient evidence to assess safety of opioids in labour pain Ullman et al. 2010
19 Tramadol Prodrug, with active metabolite O-desmethyl tramadol=m1 Affects both opioid receptor and prevents serotonin uptake CYP 2D6 substrate Polymorphisms: poor metaboliser, no/poor drug effect; extensive metaboliser, marked drug effect, adverse effects Drug interactions (SSRI)
20 Different pharmacokinetics of tramadol in mothers treated for labour pain and in their neonates
21 A comparison of tramadol and pethidine analgesia on the duration of labour: A randomised clinical trial Khooshideh et al. Australian and New Zealand Journal of Obstetrics and Gynaecology 2009 Pethidine 50 mg vs tramadol 100mg N= 160 Shorter delivery time with tramadol 165 min vs. 223 min
22 The Risk of Cesarean Delivery with Neuraxial Analgesia Given Early versus Late in Labor CSE (n=366) vs. hydromorphone mg (n=362) No differences in labour outcome * <0.001 Pain (VRS) at 1 st pain request Pain at 2 nd request Duration of 1 st analgesia CSE 8 (7-9) 5 (3-7) 95 (73-119) Opioid 8 (7-9) 8 * (7-9) 108 * (80-144) Vomiting 7/366 62/362 * Wong et al. N Engl J Med 2005 Umbilical vein ph Umbilical artery ph 7.30± ± ± ±0.07
23 Oxycodone µ-opioid agonist T½ 3-4 h Metbolism: CYP 3A4 and CYP 2D6 Oxymorphone, noroxycodone, noroxymorphone Hodge 1965: No advantages when comparing to pethidine and morphine Data quality poor
24 Oxycodone in early labour pain Oxycodone 1 mg i.v. ad. 5 mg Pharmacokinetic/dynamic study P-Oxycodone: Umbilical artery: 3,2 (0,1 14) mg/l Umbilical vein 2,7 (0,0 14) mg/l Mother 3,0 (0,1 15) mg/l Positive correlation (r = 0,98 ja 0,96, p = 0,001)
25 Morphine and diamorphine (heroin) Diamorphine: prodrug 3,6-diacetyl ester of morphine T½ <10 min Parenteral use Morphine T ½ 2-3 h Intrathecal use M6-glucuronide, and M3-glucuronide Renal excretion
26 Addition of low-dose morphine to intrathecal bupivacaine/ sufentanil labour analgesia: A randomised controlled study Morphine 50 or 100 µg or saline added to bupivacaine 1,25 mg + sufentanil 5 µg Hein et al 2010 IJOA
27 Addition of low-dose morphine to intrathecal bupivacaine/ sufentanil labour analgesia: A randomised controlled study
28 Diamorphine for pain relief in labour pain: a randomised controlled trial comparing intramuscular and patient controlled analgesia McInnes et al. BJOG 2004 PCA Diamorphine, loading 1.2 mg, lock out 5 min., max 1.8 mg/h vs mg i.m
29 Diamorphine for pain relief in labour pain: a randomised controlled trial comparing intramuscular and patient controlled analgesia McInnes et al. BJOG 2004
30 Opioid dependent mother on maintenance treatment and labour pain relief Buprenorphine No difference in pain or analgesia during labour when compared to controls After labour/cs increased pain After CS increased need of analgesics Meyer et al. Eur J Pain 2010 Methadone Similar analgesic needs and response during labor than controls, but require 70% more opiate analgesic after CS Meyer et al. Obst Gyn 2007
31 Pharmacogenetics in labour analgesia Single nucleotide polymorphism in μ- opioid receptor gene (OPRM1 gene) C.304A>G 2 (118A>G) May affect individual response to opioid analgesia
32 Observational study of the effect of µ-opioid receptor genetic polymorphism on intrathecal opioid labor analgesia and post-cesarean delivery analgesia Wong et al. IJOA 2010 Postoperative analgesia CS: i.t morphine 150 μg Labour analgesia: bupivacaine + fentanyl PCEA
33 Duration of fentanyl labour analgesia Wong et al. IJOA 2010
34 Need of po morphine after CS
35 Conclusion Optimal doses of longacting opioids and dosing times are not known Pethidine use will decrease Oxycodone is a feasible opioid in early labour pain The drug effect in newborn must be followed Pharmacogenetics may change future drug therapies
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