Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstétrique et gynécologie du Canada : JOGC
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To review the literature with respect to the use of diagnostic ultrasound in the management of twin pregnancies. To make recommendations for the best use of ultrasound in twin pregnancies. ⋯ The benefit expected from this guideline is facilitation and optimization of the use of ultrasound in twin pregnancy. SUMMARY STATEMENTS: 1. There are insufficient data to make recommendations on repeat anatomical assessments in twin pregnancies. Therefore, a complete anatomical survey at each scan may not be needed following a complete and normal assessment. (III) 2. There are insufficient data to recommend a routine preterm labour surveillance protocol in terms of frequency, timing, and optimal cervical length thresholds. (II-2) 3. Singleton growth curves currently provide the best predictors of adverse outcome in twins and may be used for evaluating growth abnormalities. (III) 4. It is suggested that growth discordance be defined using either a difference (20 mm) in absolute measurement in abdominal circumference or a difference of 20% in ultrasound-derived estimated fetal weight. (II-2) 5. Although there is insufficient evidence to recommend a specific schedule for ultrasound assessment of twin gestation, most experts recommend serial ultrasound assessment every 2 to 3 weeks, starting at 16 weeks of gestation for monochorionic pregnancies and every 3 to 4 weeks, starting from the anatomy scan (18 to 22 weeks) for dichorionic pregnancies. (II-1) 6. Umbilical artery Doppler may be useful in the surveillance of twin gestations when there are complications involving the placental circulation or fetal hemodynamic physiology. (II-2) 7. Although many methods of evaluating the level of amniotic fluid in twins (deepest vertical pocket, single pocket, amniotic fluid index) have been described, there is not enough evidence to suggest that one method is more predictive than the others of adverse pregnancy outcome. (II-3) 8. Referral to an appropriate high-risk pregnancy centre is indicated when complications unique to twins are suspected on ultrasound. (II-2) These complications include: 1. Twin-to-twin transfusion syndrome 2. Monoamniotic twins gestation 3. Conjoined twins 4. Twin reversed arterial perfusion sequence 5. Single fetal death in the second or third trimester 6. Growth discordance in monochorionic twins. Recommendations 1. All patients who are suspected to have a twin pregnancy on first trimester physical examination or who are at risk (e.g., pregnancies resulting from assisted reproductive technologies) should have first trimester ultrasound performed. (II-2A) 2. Every attempt should be made to determine and report amnionicity and chorionicity when a twin pregnancy is identified. (II-2A) 3. Although the accuracy in confirmation of gestational age at the first and second trimester is comparable, dating should be done with first trimester ultrasound. (II-2A) 4. Beyond the first trimester, it is suggested that a combination of parameters rather than a single parameter should be used to confirm gestational age. (II-2C) 5. When twin pregnancy is the result of in vitro fertilization, accurate determination of gestational age should be made from the date of embryo transfer. (II-1A) 6. There is insufficient evidence to make a recommendation of which fetus (when discordant for size) to use to date a twin pregnancy. However, to avoid missing a situation of early intrauterine growth restriction in one twin, most experts agree that the clinician may consider dating pregnancy using the larger fetus. (III-C) 7. In twin pregnancies, aneuploidy screening using nuchal transluscency measurements should be offered. (II-2B) 8. Detailed ultrasound examination to screen for fetal anomalies should be offered, preferably between 18 and 22 weeks' gestation, in all twin pregnancies. (II-2B) 9. When ultrasound is used to screen for preterm birth in a twin gestation, endovaginal ultrasound measurement of the cervical length should be performed. (II-2A) 10. Increased fetal surveillance should be considered when there is either growth restriction diagnosed in one twin or significant growth discordance. (II-2A) 11. Umbilical artery Doppler should not be routinely offered in uncomplicated twin pregnancies. (I-E) 12. For defining oligohydramnios and polyhydramnios, the ultrasonographer should use the deepest vertical pocket in either sac: oligohydramnios when < 2 cm and polyhydramnios when > 8 cm. (II-2B).
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J Obstet Gynaecol Can · Sep 2010
Review Practice GuidelineAntibiotic prophylaxis in obstetric procedures.
To review the evidence and provide recommendations on antibiotic prophylaxis for obstetrical procedures. ⋯ Implementation of this guideline should reduce the cost and harm resulting from the administration of antibiotics when they are not required and the harm resulting from failure to administer antibiotics when they would be beneficial. SUMMARY STATEMENTS: 1. Available evidence does not support the use of prophylactic antibiotics to reduce infectious morbidity following operative vaginal delivery. (II-1) 2. There is insufficient evidence to argue for or against the use of prophylactic antibiotics to reduce infectious morbidity for manual removal of the placenta. (III) 3. There is insufficient evidence to argue for or against the use of prophylactic antibiotics at the time of postpartum dilatation and curettage for retained products of conception. (III) 4. Available evidence does not support the use of prophylactic antibiotics to reduce infectious morbidity following elective or emergency cerclage. (II-3) RECOMMENDATIONS: 1. All women undergoing elective or emergency Caesarean section should receive antibiotic prophylaxis. (I-A) 2. The choice of antibiotic for Caesarean section should be a single dose of a first-generation cephalosporin. If the patient has a penicillin allergy, clindamycin or erythromycin can be used. (I-A) 3. The timing of prophylactic antibiotics for Caesarean section should be 15 to 60 minutes prior to skin incision. No additional doses are recommended. (I-A) 4. If an open abdominal procedure is lengthy (>3 hours) or estimated blood loss is greater than 1500 mL, an additional dose of the prophylactic antibiotic may be given 3 to 4 hours after the initial dose. (III-L) 5. Prophylactic antibiotics may be considered for the reduction of infectious morbidity associated with repair of third and fourth degree perineal injury. (I-B) 6. In patients with morbid obesity (BMI>35), doubling the antibiotic dose may be considered. (III-B) 7. Antibiotics should not be administered solely to prevent endocarditis for patients who undergo an obstetrical procedure of any kind. (III-E).
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To review the evidence and provide recommendations for the counselling and management of obese parturients. ⋯ 1. Periodic health examinations and other appointments for gynaecologic care prior to pregnancy offer ideal opportunities to raise the issue of weight loss before conception. Women should be encouraged to enter pregnancy with a BMI < 30 kg/m(2), and ideally < 25 kg/m(2). (III-B). 2. BMI should be calculated from pre-pregnancy height and weight. Those with a pre-pregnancy BMI > 30 kg/m(2) are considered obese. This information can be helpful in counselling women about pregnancy risks associated with obesity. (II-2B). 3. Obese pregnant women should receive counselling about weight gain, nutrition, and food choices. (II-2B). 4. Obese women should be advised that they are at risk for medical complications such as cardiac disease, pulmonary disease, gestational hypertension, gestational diabetes, and obstructive sleep apnea. Regular exercise during pregnancy may help to reduce some of these risks. (II-2B). 5. Obese women should be advised that their fetus is at an increased risk of congenital abnormalities, and appropriate screening should be done. (II-2B). 6. Obstetric care providers should take BMI into consideration when arranging for fetal anatomic assessment in the second trimester. Anatomic assessment at 20 to 22 weeks may be a better choice for the obese pregnant patient. (II-2B). 7. Obese pregnant women have an increased risk of Caesarean section, and the success of vaginal birth after Caesarean section is decreased. (II-2B). 8. Antenatal consultation with an anaesthesiologist should be considered to review analgesic options and to ensure a plan is in place should a regional anaesthetic be chosen. (III-B). 9. The risk of venous thromboembolism for each obese woman should be evaluated. In some clinical situations, consideration for thromboprophylaxis should be individualized. (III-B).
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This guideline reviews the evidence relating to the potential benefits of the vaginal hysterectomy (VH) and supracervical hysterectomy (SCH) versus total abdominal hysterectomy (TAH) with respect to postoperative sexual function, urinary function, and peri- and postoperative complications. Laparoscopic options are not included in this guideline. ⋯ 1. Vaginal hysterectomy is generally considered the first choice of surgical approach for most benign indications for hysterectomy, as it is associated with lower rates of morbidity, fewer postoperative complications, and a faster recovery time than abdominal hysterectomy. (I-A). 2. Women contemplating a vaginal, laparoscopic, or abdominal hysterectomy for the management of benign uterine disease should be reassured that hysterectomy is usually associated with improved quality of life, including improved sexual function, whether or not the cervix is removed. (I-B). 3. Supracervical hysterectomy should not be recommended as a superior technique to total abdominal hysterectomy for the prevention of postoperative lower urinary tract symptoms. (I-B). 4. Although supracervical hysterectomy may be associated with less blood loss and a shorter surgical time, these parameters have not been found to be clinically significant, and supracervical hysterectomy should not be recommended as a superior technique to total abdominal hysterectomy for the prevention of peri- and postoperative complications. (I-B). 5. Women considering a supracervical hysterectomy should be counselled that they may continue experiencing cyclic vaginal bleeding following the surgery. (I-B). 6. Women must be advised that they require routine cytological screening following a supracervical hysterectomy. (II-B). 7. Women who require a hysterectomy and who have a current or significant history of abnormal cervical cytological results should be counselled on the advantages of vaginal hysterectomy or total abdominal hysterectomy over supracervical hysterectomy. (I-B).
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J Obstet Gynaecol Can · Oct 2009
Review Practice GuidelineActive management of the third stage of labour: prevention and treatment of postpartum hemorrhage.
To review the clinical aspects of postpartum hemorrhage (PPH) and provide guidelines to assist clinicians in the prevention and management of PPH. These guidelines are an update from the previous Society of Obstetricians and Gynaecologists of Canada (SOGC) clinical practice guideline on PPH, published in April 2000. ⋯ Prevention of Postpartum Hemorrhage 1. Active management of the third stage of labour (AMTSL) reduces the risk of PPH and should be offered and recommended to all women. (I-A) 2. Oxytocin (10 IU), administered intramuscularly, is the preferred medication and route for the prevention of PPH in low-risk vaginal deliveries. Care providers should administer this medication after delivery of the anterior shoulder. (I-A) 3. Intravenous infusion of oxytocin (20 to 40 IU in 1000 mL, 150 mL per hour) is an acceptable alternative for AMTSL. (I-B) 4. An IV bolus of oxytocin, 5 to 10 IU (given over 1 to 2 minutes), can be used for PPH prevention after vaginal birth but is not recommended at this time with elective Caesarean section. (II-B) 5. Ergonovine can be used for prevention of PPH but may be considered second choice to oxytocin owing to the greater risk of maternal adverse effects and of the need for manual removal of a retained placenta. Ergonovine is contraindicated in patients with hypertension. (I-A) 6. Carbetocin, 100 microg given as an IV bolus over 1 minute, should be used instead of continuous oxytocin infusion in elective Caesarean section for the prevention of PPH and to decrease the need for therapeutic uterotonics. (I-B) 7. For women delivering vaginally with 1 risk factor for PPH, carbetocin 100 microg IM decreases the need for uterine massage to prevent PPH when compared with continuous infusion of oxytocin. (I-B) 8. Ergonovine, 0.2 mg IM, and misoprostol, 600 to 800 microg given by the oral, sublingual, or rectal route, may be offered as alternatives in vaginal deliveries when oxytocin is not available. (II-1B) 9. Whenever possible, delaying cord clamping by at least 60 seconds is preferred to clamping earlier in premature newborns (< 37 weeks' gestation) since there is less intraventricular hemorrhage and less need for transfusion in those with late clamping. (I-A) 10. For term newborns, the possible increased risk of neonatal jaundice requiring phototherapy must be weighed against the physiological benefit of greater hemoglobin and iron levels up to 6 months of age conferred by delayed cord clamping. (I-C) 11. There is no evidence that, in an uncomplicated delivery without bleeding, interventions to accelerate delivery of the placenta before the traditional 30 to 45 minutes will reduce the risk of PPH. (II-2C) 12. Placental cord drainage cannot be recommended as a routine practice since the evidence for a reduction in the duration of the third stage of labour is limited to women who did not receive oxytocin as part of the management of the third stage. There is no evidence that this intervention prevents PPH. (II-1C) 13. Intraumbilical cord injection of misoprostol (800 microg) or oxytocin (10 to 30 IU) can be considered as an alternative intervention before manual removal of the placenta. (II-2C) TREATMENT OF PPH: 14. For blood loss estimation, clinicians should use clinical markers (signs and symptoms) rather than a visual estimation. (III-B) 15. Management of ongoing PPH requires a multidisciplinary approach that involves maintaining hemodynamic stability while simultaneously identifying and treating the cause of blood loss. (III-C) 16. All obstetric units should have a regularly checked PPH emergency equipment tray containing appropriate equipment. (II-2B) 17. Evidence for the benefit of recombinant activated factor VII has been gathered from very few cases of massive PPH. Therefore this agent cannot be recommended as part of routine practice. (II-3L) 18. Uterine tamponade can be an efficient and effective intervention to temporarily control active PPH due to uterine atony that has not responded to medical therapy. (III-L) 19. Surgical techniques such as ligation of the internal iliac artery, compression sutures, and hysterectomy should be used for the management of intractable PPH unresponsive to medical therapy. (III-B) Recommendations were quantified using the evaluation of evidence guidelines developed by the Canadian Task Force on Preventive Health Care (Table 1).