PAE509 — Neonatology and Genetics: Lecture Note

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This is the complete lecture note for PAE509 Neonatology and Genetics. You can read it online below, open it in the full viewer, or download the PDF for offline study. It pairs with the course's video lectures, so you can read and watch together.

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la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS

la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Course code: PAE 509 Course title: Neonatology and Genetics Course credit load: 2 Units Series 1: Introduction to Neonatology, the Normal Newborn, and Changes at Birth • Part 1.1: Introduction to Neonatology and Vital Statistics o Sub Part 1.1.1: Defining neonatology and the neonatal period o Sub Part 1.1.2: Key vital statistics in neonatology o Sub Part 1.1.3: The significance of neonatal statistics for clinical practice • Part 1.2: The Normal Newborn: Assessment and Characteristics o Sub Part 1.2.1: Immediate assessment of the newborn at birth o Sub Part 1.2.2: Assessment of gestational age o Sub Part 1.2.3: Characteristic features of the normal term newborn • Part 1.3: Physiological Changes at Birth: Respiratory and Cardiovascular Transition o Sub Part 1.3.1: Respiratory changes at birth o Sub Part 1.3.2: Cardiovascular changes at birth o Sub Part 1.3.3: Clinical significance of the fetal to neonatal circulatory transition • Part 1.4: Physiological Changes at Birth: Thermoregulation and Metabolic Adaptation o Sub Part 1.4.1: Thermoregulation in the newborn o Sub Part 1.4.2: The physiological basis of neonatal heat production o Sub Part 1.4.3: Metabolic adaptations required at birth Introduction Picture the moment a baby is born: within seconds, a series of dramatic physiological changes must occur for the newborn to survive independently outside the womb, from the first breath that expands previously fluid-filled lungs to the rerouting of blood flow away from the placenta. This Series opens the PAE 509 course by introducing neonatology as a discipline and building a thorough understanding of the normal newborn and the remarkable physiological transition that occurs at birth, a foundation that underpins everything else you will study in this course.

la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS The aim of this Series is to equip you with the knowledge required to understand key neonatal vital statistics, assess a normal newborn at birth, and understand the physiological changes that occur as the newborn transitions from intrauterine to extrauterine life. This Series begins with an introduction to neonatology and vital statistics, before turning to the assessment and characteristics of the normal newborn. Next, we examine the respiratory and cardiovascular changes at birth, before concluding with thermoregulation and other metabolic adaptations at birth. Series Learning Outcomes At the end of this Series, you should be able to: • SLO 1.1: define neonatology and the neonatal period, • SLO 1.2: describe key vital statistics used in neonatology, including birth rate, neonatal mortality rate, and perinatal mortality rate, • SLO 1.3: describe the normal assessment of a newborn at birth, including the Apgar score and gestational age assessment, • SLO 1.4: describe the characteristic physical features of a normal term newborn, • SLO 1.5: describe the physiological changes in the respiratory system at birth, • SLO 1.6: describe the physiological changes in the cardiovascular system at birth, including the transition from fetal to neonatal circulation, • SLO 1.7: describe thermoregulation and the mechanisms of heat loss in the newborn, and • SLO 1.8: describe the metabolic adaptations required of the newborn immediately after birth. 1.1 Introduction to Neonatology and Vital Statistics 1.1.1 defining neonatology and the neonatal period A short period with outsized clinical importance Neonatology is the branch of paediatrics concerned with the medical care of the newborn infant, particularly those who are unwell or at increased risk due to prematurity, low birth weight, or complications arising during pregnancy or delivery. The neonatal period is defined as the first 28 completed days of life, further subdivided into the early neonatal period, the first 7 days, and the late neonatal period, from day 8 to day 28, a distinction that matters because the risk and pattern of illness and death differ considerably between these two windows.

la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS The neonatal period, though brief, is a time of disproportionately high risk, since the physiological transition from intrauterine to extrauterine life, discussed later in this Series, together with the vulnerability of a newly born infant to infection, temperature instability, and feeding difficulties, means a substantial proportion of all childhood deaths occur within this narrow window, making neonatal care a particularly high-yield area of paediatric practice. Fill in the blank: The neonatal period is defined as the first ________ completed days of life. 1.1.2 key vital statistics in neonatology Several vital statistics are used to describe and compare neonatal and perinatal health outcomes across populations and over time. The birth rate refers to the number of live births per 1,000 population per year, while the neonatal mortality rate refers to the number of deaths occurring within the first 28 days of life per 1,000 live births, a key indicator of the quality and accessibility of newborn care within a given health system. The perinatal mortality rate combines stillbirths occurring after a defined gestational age threshold with early neonatal deaths, occurring within the first 7 days of life, per 1,000 total births, reflecting the combined burden of pregnancy, delivery, and immediate newborn complications, while the infant mortality rate, a broader measure, includes all deaths in the first year of life, of which neonatal deaths typically make up a substantial proportion. Fill in the blank: The perinatal mortality rate combines stillbirths with early neonatal deaths occurring within the first ________ days of life. 1.1.3 the significance of neonatal statistics for clinical practice Understanding these vital statistics is not merely an academic exercise, since neonatal mortality rate trends within a health facility or region provide an important marker of the overall quality of antenatal, intrapartum, and newborn care being delivered, and can help identify specific areas, such as delayed resuscitation, inadequate thermal care, or delayed recognition of neonatal sepsis, where targeted quality improvement efforts might meaningfully reduce preventable neonatal deaths. In many low and middle income settings, including much of Nigeria, the neonatal mortality rate remains considerably higher than in high income settings, and a large proportion of these deaths are attributable to a relatively small number of preventable or treatable causes, including prematurity and its complications, intrapartum-related complications such as birth asphyxia, and neonatal infection, each of which will be explored in greater depth across this course.

la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Fill in the blank: A large proportion of neonatal deaths in low and middle income settings are attributable to a relatively small number of ________ or treatable causes. Table 1.1: Key neonatal and perinatal vital statistics. Statistic Definition Birth rate Number of live births per 1,000 population per year Neonatal mortality rate Deaths within the first 28 days of life per 1,000 live births Perinatal mortality rate Stillbirths plus early neonatal deaths (first 7 days) per 1,000 total births Infant mortality rate Deaths within the first year of life per 1,000 live births Pilot questions 1.1 1. Define neonatology and the neonatal period. (Linked to SLO 1.1) 2. Distinguish the early from the late neonatal period. (Linked to SLO 1.1) 3. Define neonatal mortality rate and perinatal mortality rate. (Linked to SLO 1.2) 4. Explain why neonatal mortality rate is a useful indicator of the quality of newborn care. (Linked to SLO 1.2) 5. List three leading causes of neonatal death in low and middle income settings. (Linked to SLO 1.2) 1.2 The Normal Newborn: Assessment and Characteristics 1.2.1 immediate assessment of the newborn at birth The first minutes set the tone for everything that follows Immediate assessment of the newborn at birth focuses on three key questions: is the baby breathing or crying, does the baby have good tone, and is the baby term gestation, since a baby who answers all three favourably can generally remain with the mother for routine care, while a baby who does not requires prompt further assessment and, where needed, resuscitation, following the principles you will encounter in greater detail elsewhere in your paediatric training. The Apgar score, assessed at 1 minute and 5 minutes after birth, and repeated at 5 minute intervals if the initial score remains low, provides a structured, rapid assessment of the newborn's condition, scoring heart rate, respiratory effort, muscle tone, reflex irritability, and colour, each from 0 to 2, with a total score out of 10, and, while useful as a communication tool and a marker of response to resuscitation, is not intended to be used in isolation to guide the decision of whether resuscitation is required.

la-NET | ONLINE LEARNING VIDEO PLATFORM FOR POST-SECONDARY & HIGHER INSTITUTION STUDENTS Fill in the blank: The Apgar score is assessed at 1 minute and ________ minutes after birth. 1.2.2 assessment of gestational age Accurate assessment of gestational age is essential, since many aspects of expected newborn appearance, behaviour, and risk of complications are gestational age-dependent, and while antenatal ultrasound dating, particularly performed in early pregnancy, is generally the most accurate method where available, a postnatal clinical assessment, such as the

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