Sections View Full Chapter Figures Tables Videos Annotate Full Chapter Figures Tables Videos Supplementary Content ++ See following table. ++Table Graphic Jump Location|Download (.pdf)|PrintDecelerationEtiologyClinical situationAppearanceEarlyFetal head compressionDuring sterile vaginal examinationsIn second stage of labor when pushingDuring application of internal FHR electrodeCPDAfter rupture of amniotic sacVertex presentationsVariableCord compressionLateUteroplacental insufficiencyExcessive uterine contractionsMaternal hypotensionMaternal hypoxemia (asthma, pneumonia)Reduced placental exchange as in: Hypertensive disorders, diabetes, IUGR abruption Reproduced from Hon EH. An Atlas of Fetal Heart Rate Patterns. New Haven: Harty Press; 1968. ++Table Graphic Jump Location|Download (.pdf)|PrintSignificance of the Various PatternsReassuring patterns (positive outcomes, fetal well-being)Mild variable decelerations (<30 s with rapid return to baseline)Early decelerationsAccelerations without any other significant changesNonreassuring, or “warning,” patterns suggest decreasing fetal capacity to cope with the stress of laborDecrease in baseline variabilityProgressively worsening tachycardia (>160 bpm)Decrease baseline FHRIntermittent late decelerations with good variabilityPatterns suggesting fetal compromisePersistent late decelerations, with decreasing variabilityVariable decelerations with loss of variability, tachycardia, or late return to baselineAbsence of variabilityProfound bradycardia Your Access profile is currently affiliated with [InstitutionA] and is in the process of switching affiliations to [InstitutionB]. Please select how you would like to proceed. Keep the current affiliation with [InstitutionA] and continue with the Access profile sign in process Switch affiliation to [InstitutionB] and continue with the Access profile sign in process Get Free Access Through Your Institution Learn how to see if your library subscribes to McGraw Hill Medical products. Subscribe: Institutional or Individual Sign In Error: Incorrect UserName or Password Username Error: Please enter User Name Password Error: Please enter Password Sign in Forgot Password? Forgot Username? Download the Access App: iOS | Android Sign in via OpenAthens Sign in via Shibboleth You already have access! Please proceed to your institution's subscription. Create a free profile for additional features.