Pediatric Cardiology Flashcards
What CHD category does ventricular septal defect belong to?
Increased pulmonary blood flow
Which CHD is this?
Atrial Septal Defect
Which CHD is this? Which CHD category does it belong to?
Ventricular septal defect. Increased pulmonary blood flow.
Which CHD is this? Which CHD category does it belong to?
Atrioventricular Canal Defect. Increased pulmonary blood flow.
Which CHD is this? Which CHD category does it belong to?
Patent ductus arteriosus. Which CHD category does it belong to?
Which compensatory mechanisms would you expect from a child with increased pulmonary blood flow?
Hint: Increased pulmonary blood flow means that systemic blood flow has decreased.
- Tachypnea —> SOB/Fatigue with feeding —> Weight loss + decreased growth/development
- Tachycardia
The ______ ______ is a normal shunt present in the fetal cardiac structure. This opening allows ___________ blood to bypass the non-functioning fetal lungs. The blood will instead pass directly from the _____ ______ to the _____ _____, then normal flow to the rest of the body.
Foramen ovale
Deoxygenated
Right atrium
Left atrium
Defects involving the left and right sides of the heart will cause blood to shunt across the pressure gradient from _____ pressure (left) to ____ pressure (right). This will increase blood volume flowing through the _____ side of the heart. Subsequently, this means that a higher blood volume is being pushed through the pulmonary artery to the lungs.
- High
- Low
- Right
Fatigue, RR/distress, and increased caloric expenditure/metabolic rate are concerns for infants with CHF. Because of this, they require special alterations for feedings. What are four of them?
- Position infant semi-upright during feeding
- Allow adequate time (30min +) for each feeding
- Gradually increase caloric density (high calorie, low volume) to compensate for energy expenditure.
- If distress/severe fatigue with feeding (RR > 80), switch to enteral feeding.
What defect causes a harsh, swishing/machine-like murmur?
Patent Ductus Arteriosus
Patent Ductus Arteriosus (PDA): Explain the path of blood travel as a consequence of the patent shunt, beginning with blood return to the left atrium.
- Left atrium from pulmonary veins (oxygenated)
- LV
- Aorta
- Through PDA
- To pulmonary artery. (Process is a continuous loop)
Which side of the heart particularly will have an increased workload as a result of PDA- Patent Ductus Arteriosus?
Left side
Blood is essentially traveling in a continuous loop from the left side of the heart, to the aorta, through the PDA, and back through the pulmonary artery to the left side of the heart.
Where is the best place to listen for the murmur associated with the PDA? Why?
- Left sternal border under the left clavicle. (APETM)
- Pulmonic valve location for heart tones. There is continuous flow of blood from the aorta to the pulmonary artery through the PDA. This creates a continuous sound throughout the entire cardiac cycle.
PDA- If blood is continuously moving from the aorta through the PDA to the pulmonary artery, where is it NOT getting pushed to?
Systemic circulation.
Widened pulse pressures might be an indication of which CHD? Why?
-PDA.
- Because of the increased pressure during systole, diastolic pressure decreases —> Higher than normal systolic/ Lower than normal diastolic.
Atrioventricular canal defect, AKA Atrioventricular Septal Defect (AVSD). What two CHD’s is this technically a combination of?
ASD and VSD
Explain the flow of blood in the patient with atrioventricular septal defect, assuming complete.
Oxygenated blood returning to the left side of the heart inevitably flows to the lower pressure on the right side of the heart. So with LV contraction, blood is flowing both to the aorta and into the RV and pulmonary artery. Meaning that the blood recirculates and the LV has an increased workload.- It’s trying to meet the demand of the periphery for oxygenated blood AND is given the extra job of pumping to the pulmonary artery.
What might be present in AVSD upon assessment of the lungs? Why?
- Pulmonary Edema
- More blood being recirculated back to lungs (2-3x more than normal) and pulmonary HTN
AVSD will present with similar manifestations as the other CHD’s in its class. With patho in mind, what specific presentation might you inspect and what would you assess?
- Cyanosis.
- Skin, fingernails, lips, oral mucosa, etc.
Obstructive CHD’s are a class of disorders that involve some type of ___________ of a major _________, interfering with the ability of blood to flow freely through the ______.
- Narrowing
- Vessel
- Vessel
Obstructive CHD’s cause increased _________ backing up toward the heart. This increases cardiac workload.
Pressure
Afterload is the _______ that the ventricle must overcome to open the aortic valve and push past it.
-Pressure
Preload is the amount that the ventricles stretch during diastole. How would you increase preload? How would you decrease it?
- Fluid or blood product admin will increase preload (More volume = More stretching)
- Vasodilator Would decrease venous return (So decrease in blood returning to the heart)
__________ ______________ _____________ is the resistance in the circulatory system that is used to create blood pressure.
Vasoconstriction = Increased _________ __________.
Vasodilation = Decreased _________ _________.
- Peripheral vascular resistance
- Vascular resistance x2