[Exam 2] Chapter 17 – Newborn Transitioning Flashcards
What is the neonatal period?
The first 28 days of life.
Circulation through the heart changes: Fetus vs Newborn?
FEtus: Pressure in right atrium are greater than left
Newborn: Pressure in the left atrium are greater then right
The newborn’s most dramatic and most rapid extrauterine transitions occur in what areas?
Respiratory, Circulatory, Thermoregulation, and Ability to stabilize blood glucose levels
(N) Cardiovascular System Adaptations: What do the umbilical veins do?
Carries oxygenated blood from the placenta to the fetus
(N) Cardiovascular System Adaptations: What does the ductus venosus allow?
The majority of the umbilical vein blood to bypass the liver and merge with blood moving through the vena cava
(N) Cardiovascular System Adaptations: What does the foramen ovale allow?
For more than half the blood entering the right atrium to cross immediately to the left atrium bypassing pulmonary circulation
(N) Cardiovascular System Adaptations: Change from fetal to postnatal circulation requires what?
Increased pulmonary bloow flow, removal of placenta, and closure of the intracardiac and extracardiac shunts
(N) Cardiovascular System Adaptations: What stimulates increased cardiac output and contractility, surfacant release, and promotion of pulmonary fluid clearance?
Increase in epinephrine and norepinephrine
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: What happens to the systemic vascular system when placenta clamped?
REsistance increases and blood return to the heart via the inferior vena cava decreases
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: Why does the foramen ovale close?
Due to decrease in pulmonary vascular resistance, which leads to decrease in right-sided heart pressures
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: Changes in the atrial after birth?
Left atrial pressure increases and right atrial pressure decrease
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: Where is the ductus arteriosus and what does it do?
Between aorta and pulmonary artery. Protects lungs against overload by shunting blood (right to left) into the descending aorta, bypassing pulmonary circulation
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: When does the ductus arteriosus close?
Within a few hours after birth. Oxygen important in closing closure. Depends on high oxygen content of the aortic blood that results from aeration of lungs at birth
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: What happens to pulmonary vascular resistance at birth?
Decreases, which allows pulmonary blood flow to increase and oxygen exchange to occur in the lungs
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: What did the ductus venosus do?
Shunted blood from the left umbilical vein to the inferior vena cava during intrauterine life .
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: When does the ductus venosus close?
Within a few days after birth. Not needed because liver takes over functions of placenta
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: What happens to the two arteries and vein at birth?
Constrict at birth, because of placental expulsion and blood flow ceases.
(N) Cardiovascular System Adaptations - Fetal to Neonatal Circul. Changes: Normal path of blood flow in the heart now?/
Pulmonary Veins -> Right Atrium -> right Ventricle -> lungs -> left atrium ->left ventricle -> aorta
(N) Cardiovascular System Adaptations - Heart Rate: HR a few minutes after birth? An decreases to what average?
110 to 160
120 to 130 bpm is the average after it decreases
(N) Cardiovascular System Adaptations - Heart Rate: When is blood pressure highest?
After birth and reaches plateau within a week after birth
(N) Cardiovascular System Adaptations - Heart Rate: Tachycardia may be found with what?
Volume depletion, cardiorespiratory disease, drug withdrawal, and hyperthyroidism
(N) Cardiovascular System Adaptations - Heart Rate: Bradycardia may be found with what
Apnea and Hypoxia
(N) Cardiovascular System Adaptations - Blood Volume: Usually estimated to be what?
80-85 mL/kg. May vary by as much as 25-40%
(N) Cardiovascular System Adaptations - Blood Volume: Early (before 30 seconds) or late (after 3 mins) clamping of the umbilical cord changes what?
Circulatory dynamics during transition