Presentation on theme: "By: Dr. Ayman Bukhari House officer Obstetrics & Gynaecology"— Presentation transcript:
1By: Dr. Ayman Bukhari House officer Obstetrics & Gynaecology First Stage of LaborBy: Dr. Ayman BukhariHouse officerObstetrics & Gynaecology
2Contents: Introduction Stages of labor Diagnosis Management on admissionActive management of laborMonitoringPartogramAbnormalitiesPain control
3IntroductionLabor : Uterine contractions resulting in progressive dilation and effacement of the cervix and accompanied by descent and expulsion of the fetus.Abnormal labor, dystocia, and failure to progress are terms used to describe a difficult labor patternApproximately 20 % of labors involve dystocia
4Stages of labor NORMAL LABOR — divided into Four stages First stage: time from the onset of labor until complete cervical dilatationSecond stage: time from complete cervical dilatation to expulsion of the fetusThird stage: time from expulsion of the fetus to expulsion of the placentaFourth stage: the 1st post partum hour..
5Recommendations on definitions of the first stage of labor: The first stage is further subdivided into the latent and active phases.active phase subdivided into three additional phases:acceleration phasephase of maximum slopedeceleration phase
6Recommendations on definitions of the first stage of labor: Latent phase is typically characterized by mild, infrequent, irregular contractions with gradual change in cervical dilation (usually <1 cm / h) and effacement.NulliparousMultiparousLatent phase6.4 h4.8 hAbnormal20 h14 hNot influenced by maternal age, birth weight, or obstetric abnormalities
7Recommendations on definitions of the first stage of labor: Active phase — begins at 3 to 4 centimeters when cervical dilatation is plotted against time..characterized by painful contractions of increasing frequency, intensity, and duration accompanied by more rapid (usually >1 cm /h) cervical change.
8Recommendations on definitions of the first stage of labor:
9Recommendations on definitions of the first stage of labor:
10Discharge if labor hasn’t begun Diagnosis of labor The determination of whether a woman is in labor is made within one hour of admission .Diagnosis of labor is made only when painfull contractions are accompanied by any one of the following :Bloody showRupture of the membranesFull cervical effacement.Cervical dilatation is not part of the criteriaLabor unitMeet the criteriaDischarge if labor hasn’t begunAntinatal wardRest & observationUntil next dayDidn’t meet thecriteria
11Diagnosis of laborThe correct diagnosis of labor is considered to be the single most important determination in the management of labor because an incorrect diagnosis of active labor will lead to inappropriate interventions and an increased likelihood of cesarean delivery.
12Management on admission Patient preparation — There is no evidence that routine enemas or perineal shaving is beneficial .A urinary catheter is not necessary unless the woman is unable to void, but she should be encouraged to empty her bladder regularly as a full bladder can impede fetal descent.Fluids and oral intake — There is no consensus on acceptable maternal oral intake during uncomplicated labor
13Management on admission Placement of an intravenous line or a hep-lock at the time admission is recommended.Interestingly, one randomized trial found that women who received intravenous hydration at 250 mL/h had fewer labors persisting for over 12 hours and less need for oxytocin augmentation than those who received 125 mL/h
14Management on admission Antibiotic prophylaxis : (in some centers)to prevent early-onset neonatal infection in appropriate patients;the agent of choice is intravenous penicillin. A minimum of four hours of intrapartum therapy has been recommended prior to deliveryAlthough normal labor and vaginal delivery is not an indication for prophylaxis against infective endocarditis, some centers generally administer antibiotic prophylaxis during labor to pregnant women with underlying valvular heart disease.
15Management on admission Monitoring — All pregnant women require surveillance (eg, monitoring of vital signs and FHR) since 20 to 25 % of all perinatal morbidity and mortality occurs in pregnancies with no underlying risk factors for adverse outcome .Assessment of the quality of the uterine contractions and cervical examinations are repeated at appropriate intervals to follow the progress of labor.
16Management on admission cervical examination should be kept to a minimum to avoid promoting intraamniotic infection.In general, vaginal examinations are performed:On admissionAt one to four hour intervals in the first stage and at one hour intervals in the second stageAt rupture of membranes to evaluate for cord prolapsePrior to intrapartum administration of analgesiaWhen the parturient feels the urge to push to determine whether the cervix is fully dilatedIf the FHR falls, to evaluate for conditions such as cord prolapse or uterine rupture.The results can be noted on a partogram
18Active management of labor It refers to active control, rather than passive observation, over the course of labor by the obstetrical provider.It includes three essential elementsCareful diagnosis of labor by strict criteriaConstant monitoring of labor with specific standards for normal progressionPrompt intervention (eg, amniotomy, high dose oxytocin) according to established guidelines if progress is unsatisfactory .
19Active management of labor The active management of labor is generally limited to women who meet the following criteria:NulliparousTerm pregnancySingleton infant in cephalic presentationNo pregnancy complicationsExperiencing spontaneous onset of labor.
20Active management of labor Nulliparous labor tends to be more subject to failure to progress .administration of oxytocin, sometimes at high dosages, is one of the interventions involved in active management. This is safer in nulligravid women since the nulligravid uterus is virtually immune to rupture (except as a result of manipulation or previous surgery)
21Active management of labor Recommendation on routine amniotomyLimited evidence showed no substantial benefit for early amniotomy and routine use of oxytocincompared with conservative management of labor.In normally progressing labor, amniotomy should not be performed routinely.Combined early amniotomy with use of oxytocin should not be used routinely.
22Active management of labor Interventions with amniotomy and/or high dose oxytocin are initiated if progress does not proceed according to the defined standards.Rutpure of the fetal membranes provides information about fetal status, but does not appear to significantly accelerate labor . In the Dublin protocol, rupture must be performed before treatment with oxytocin, which is administered only in the presence of clear amniotic fluid .
23Active management of labor If membranes are ruptured when there is polyhydramnios or an unengaged fetal presenting part, it is prudent to use a small gauge needle, rather than a hook, to puncture the fetal membranes in one or more places, and to perform the procedure in the operating room. This "controlled amniotomy“ permits emergency cesarean delivery in the event of an umbilical cord prolapse .Routine amniotomy should not be performed in women with active hepatitis B & C or HIV in order to minimize exposure of the fetus to ascending infection.
24Active management of labor So usually, Amniotomy is indicated to further evaluate fetal status (eg, placement of a fetal scalp electrode) or uterine contractions (eg, placement of an intrauterine pressure catheter).
25Active management of labor Slower progress in the nulliparous patient is most often the result of inefficient uterine action .In the absence of medical contraindications, labor that fails to progress is treated with oxytocin
26MonitoringIt is desirable that all examinations be performed by a single individual to minimize interobserver variationsA vaginal examination during labor often raises anxiety and interrupts the woman’s focus & if there is (PRoM), increasing numbers of VEs have been found to be associated with neonatal sepsis ….
27Monitoring:Recommendations on monitoring during the established first stage of laborA pictorial record of labor (partogram) should be used once labor is established.4 hourly temperature and blood pressurehourly pulsehalf-hourly documentation of frequency of contractionsfrequency of emptying the bladdervaginal examination offered 4 hourly, or when there is concern about progressIntermittent auscultation of the fetal heart after a contraction should occur for at least1 minute, at least every 15 minutes, and the rate should be recorded as an average.
30Monitoring: Fetal heart rate — fetal heart rate assessment has become a standard of care for all women in the United States because patients and clinicians are reassured by normal results and believe there is some value in detecting abnormal patterns.
31Monitoring:The American College of Obstetricians and Gynecologists suggests that electronic fetal monitoring tracings to be reviewed :In general, continuous intrapartum FHR monitoring is suggested for high-risk patients and when FHR below 110 or over 160 BPMFirst stageSecond stageLow risky30 min15 minHigh risky5 min
32Monitoring: Intermittent auscultation of the F.H is recommended Once a woman is in established active labor, intermittent auscultation of the fetal heart after a contraction should be continuedIntermittent auscultation can be undertaken by either Doppler ultrasound or Pinard stethoscope.
33Monitoring: Uterine contractions simple observation of the mother palpation of the fundusCTGdirect measurement of intrauterine pressure via internal manometry or pressure transducers95% of women in active labor will have3-5 contractions per 10 minutes.
35Partogram:a graphical representation that clearly shows the patient's labor compared to the expected lower limit of "normal progress Some clinicians employ a partogram with alert and action lines. The alert line represents the rate of dilatation of the slowest 10 % of labors in primigravidae. Crossing the alert line suggests that the patient should be transferred to a hospital if she is laboring in a rural setting. The action line is parallel and four hours to the right of the alert line; crossing the action line suggests the need for intervention (eg, artificial rupture of the membranes, administration of oxytocics).
37Abnormalities Maternal pelvis Cervix Uterus Fetus i.e ( power, passenger, or pelvis).Hypocontractile uterine activity — is the most common cause of protraction or arrest disorders in the first stage of labor. This entity refers to uterine activity that is either not sufficiently strong or not appropriately coordinated to dilate the cervix and expel the fetus. It occurs in 3-8 % of parturients and can be quantified as uterine contraction pressures less than 200 Montevideo units.
38AbnormalitiesHypocontractile uterine activity is treated with oxytocin in the United States. Oxytocin is the only medication approved by the US Food and Drug Administration (FDA) for labor stimulation in the active phase
39AbnormalitiesActive phase arrest is diagnosed when a protraction disorder persists despite oxytocin therapy to achieve ≥ 200 Montevideo units for greater than two hours; cesarean delivery is typically performed at this pointThe National Institute for Health and Clinical Excellence (NICE) also recommended starting oxytocin and monitoring the progress of labor over the next four hours. If less than 2 cm of cervical dilatation occurred, they recommended consideration of cesarean delivery
40AbnormalitiesCephalopelvic disproportion — A disproportion between the size of the fetus relative to the mother can lead to a diagnosis of dystocia . This diagnosis is based upon observation of slow or arrested labor during the active phase. However, it is usually duo to fetal malposition (eg, extended or asynclitic fetal head) or malpresentation (mento- posterior, brow), rather than a true disparity between fetal and maternal pelvic dimensions
41AbnormalitiesDiagnosis of POSITION can generally be made by digital examination, but if there is uncertainty, ultrasound examination is useful and accurate(OA)… (left 2/3)(Transverse positions are unstable)…(OP) …mostly spontaneously rotate to (OA) during the course of labor.However, approximately 5 % experience malposition with persistent OP position or transverse arrest.
42Pain Control:The pain of childbirth is likely to be the most severe pain that a woman experiences during her lifetime.
43Pain Control:women should be involved in the decision of pain relief, to increase maternal satisfaction.This can be accomplished by educating women about pain relief techniques during pregnancy, prior to the onset of labor, as rational decision-making is difficult during times of emotional & physical stress .Furthermore, using patient-controlled epidural analgesia (PCEA) empowers the parturient by giving her direct control of her pain relief, and this may increase maternal satisfaction .
44Pain Control: First stage of labor Visceral or cramp-like source : uterus and cervix, produced by distention of uterine and cervical mechanoreceptors and by ischemia of uterine and cervical tissues///. The pain signal enters the spinal cord after traversing the T10, T11, T12, and L1 .abdominal wall, lumbosacral region, iliac crests, gluteal areas, and thighs.///Transition refers to the shift from the late first stage (7 to 10 cm cervical dilation) to the second stage of labor. Transition is associated with greater nociceptive input as the parturient begins to experience somatic pain from vaginal distention.
45Pain Control:Hyperventilation — consistently accompanies labor pain. Arterial CO2 partial pressures less than 20 mmHg are not uncommon, and profound hypocarbia may inhibit ventilatory drive between contractions and result in maternal hypoxemia, lightheadedness, and loss of consciousness . respiratory alkalosis, which impairs oxygen transfer from the maternal to fetal circulation, may occur.
46Pain Control:Psychological effects — unrelieved pain may also be a factor that contributes to the development of postpartum psychological trauma. This may negatively influence the mother's postpartum adjustment, and in its most severe form, result in post-traumatic stress disorder (PTSD) which shouldn’t be underestemated.
47ANALGESIA FOR THE FIRST STAGE OF LABOR : classified as eithersystemiclocoregional
48Systemic: Intravenous Intramuscular inhalation routes most popular agents are opioids (eg, morphine, fentanyl, meperidine)
49Systemic:Newer opioid analgesics — Fentanyl, a synthetic opioid, and its congeners (eg, sufentanil, alfentanil, and remifentanil) have also been used to provide labor pain relief. These drugs have a short duration of action, so they are best administered using the intravenous, rather than the intramuscular route.
50SystemicInhalation agents — Nitrous oxide . The parturient self-administers the anesthetic gas using a hand-held face mask. The safety of this technique is that the parturient will be unable to hold the mask if she becomes too drowsy. A systematic review on nitric oxide for relief of labor pain concluded it was inexpensive, easy to administer, and safe for both mother and fetus. The analgesic effect was better than that produced by opioids, but less than with epidural analgesia
51Regional techniques:Epidurals and Spinals are the most popular modalitiesRegional techniques are widely acknowledged to be the only consistently effective means of relieving the pain of labor and delivery. Local injection may also be administered to achieve paracervical or pudendal nerve block.
52Pain control:Epidural analgesia provided better pain relief than parenteral opioids. However, opioids were associated with a shorter duration of labor, less oxytocin augmentation, and fewer instrumental deliveries compared to epidural analgesia.Side effects- epidural: Nausea, vomiting, and sedation & Respiratory depression which was the major neonatal concern
53References: Up-to-Date Clinical Guideline, September 2007,Funded to produce guidelines for the NHS by NICERoyal College of Obstetricians and Gynaecologists: Clinical Effectiveness Support Unit. The Care of Women Requesting InducedAbortion. Evidence-based guideline No. 7. London: RCOGGovernment Statistical Service and Department of Health. NHS Maternity Statistics, England: 2002–03. Statistical Bulletin 2004/10.London: Department of Health; 2004.National Assembly for Wales. Maternity Statistics, Wales: Methods of Delivery, No. SDR 40/2004. Cardiff: NationalAssembly for WalesNational Collaborating Centre for Women’s and Children’s Health, Intrapartum care of healthy women and their babies dur ing childbirthReferences: