Episode 165: Early-Onset Sepsis Part 2Dr. Lovedip Kooner explains how to use the Kaiser Permanente early-onset sepsis calculator and explains other useful tools to assist in the diagnosis of EOS. Dr. Arreaza adds comments about the usefulness of this calculatorWritten by Lovedip Kooner, MD. Comments and editing by Hector Arreaza, MD.You are listening to Rio Bravo qWeek Podcast, your weekly dose of knowledge brought to you by the Rio Bravo Family Medicine Residency Program from Bakersfield, California, a UCLA-affiliated program sponsored by Clinica Sierra Vista, Let Us Be Your Healthcare Home. This podcast was created for educational purposes only. Visit your primary care provider for additional medical advice.Introduction: As a recap, Early-onset sepsis is diagnosed within 72 hours (or within 7 days, according to some experts) after birth. We talked about GBS as the main culprit of EOS. 28% of EOS by GBS are babies born 4 hrsTwo or more physiologic abnormalities lasting for > 2 hrsNote: abnormality can be intermittent.An ill newborn, in general, is described as having abnormal vital signs, either hyper or hypothermia, tachycardia, bradycardia or arrhythmia, flaccid, doesn’t regard faces, no or muted reflexes and poor suck, mottled color, cyanosis or bruising, petechiae, retractions, nasal flair or poor nasal breathing (with choanal atresia, pinks up only when crying), gasping respirations,  poor bowel sounds, possibly distended OR scaphoid (with atresias will have scaphoid abdomen and with anomalies like TEF depending on type, emesis or difficulty breathing when fed)  obvious congenital anomalies, etc.Clinical Illness in the Kaiser Permanentetool is defined as:Persistent need for Nasal CPAP / High flow nasal cannula / mechanical ventilation (outside of the delivery room)Hemodynamic instability requiring vasoactive medicationsNeonatal encephalopathy/Perinatal depression: Seizure, Apgar Score @ 5 minutes < 5Need for supplemental O2 > 2 hours to maintain oxygen saturations > 90% (outside of the delivery room)After all that information is entered into the Kaiser Permanente calculator, the options for management are clinical monitoring, laboratory evaluation, or antibiotic administration. Example: -Incidence: 0.5/1,000 live births -Gestational age: 36 6/7 weeks-Highest maternal antepartum temperature: 102 F-ROM: 5 hours-Maternal GBS: Positive-Intrapartum antibiotics: Broad spectrum 3 hours prior to birth-RESULT: EOS risk at birth 2.34.Recommendations based on physical exam:1. Well-appearing baby, risk 0.96, RECOMMENDATIONS: No culture, no antibiotics, vitals every 4 hours for 24 hours.2. Equivocal, risk 11.61, RECOMMENDATIONS: Start empiric antibiotics and vitals per NICU.3. Clinical Illness, risk 47.46, RECOMMENDATIONS: Start empiric antibiotics and vitals per NICU.The Kaiser Permanente neonatal early-onset sepsis calculator was analyzed in a meta-analysis, as published in the American Family Physician in 2021. Six high-quality, non-randomized controlled trials were evaluated, including more than 170,000 neonates. The calculator was compared to the standard approach recommended by the CDC guidelines. The analysis showed there was a statistically significant reduction in antibiotic use, a reduction in the number of laboratory tests, and a reduction in NICU admission in neonates who were managed following the sepsis calculator compared with the standard approach. There was no difference in readmission rates to NICU and no difference in culture-positive sepsis between neonates treated using the sepsis calculator and those treated with the standard approach. In summary, I recommend using the Kaiser Permanente calculator as part of your evaluation. BTW, I received no money from KP. It is important to know that depending on resources and institutional policies, your management may change.Use of CBC and CRP.CBC interpretation in neonates: Remember that CBC in newborns needs to be evaluated following the normal parameters for neonates. For example, WBC up to 30,000 per mm3, and hemoglobin up to 19.9 gm/dL can be normal in neonates. Serial white blood cell counts and immature–to–total neutrophil ratio (I/T ratio) generally greater than or equal to 0.2 by some experts is considered positive for sepsis. Complete blood cell counts taken 12-24 hours after birth are associated with increased sensitivity and negative predictive value compared to a sample taken 1-7 hours after birth. C-reactive protein (CRP) is also often used and it rises within 6 hours of infection and peaks at 24 hours. Two normal CRP levels, one taken between 8-24 hours of age and the second 24 hours later, have an over 99% negative predictive value. Single values of CRP or procalcitonin obtained after birth to assess the risk of EOS are neither sensitive nor specific to guide EOS care decisions.Procalcitonin: Procalcitonin may be difficult to interpret within the first 3 days after birth due to elevations caused by noninfectious etiologies and the physiologic rise after birth. It is important to note that neither single values of CRP nor procalcitonin after birth should be used to guide the management plan of infants undergoing evaluation for EOS>.Extreme values in CBC: Extreme values (total WBC count 0.3; ANC

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