introduction to congenital heart disease · an introduction to congenital heart defects becky...
TRANSCRIPT
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Blue is Not the New Pink: An Introduction to Congenital
Heart Defects
Becky Anderson RN, MSN, NRP, etc. Bon Secours Critical Care Transport Team
VCU Health
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Objectives
• Have a better understanding of the anatomy and physiology behind your patient’s congenital defect in order to provide better care to that patient.
• Feel more confident caring for patients whose parents are telling you to do things that might not make sense.
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Outline • Review Normal Circulation • Review Normal Fetal Circulation • Left-to-Right Shunts
– When Fetal Circulation Sticks Around • PFO, PDA • Septal Defects
• Cyanotic Defects/ Right-to-Left Shunts – Truncus Arteriosus – D-Type Transposition, – Tricuspid Atresia, – Tetraology of Fallot – Total Anomalous Pulmonary Venous Return, – Hypoplastic Left Heart
• Notes on Babies Post-Op • Broncho-Pulmonary Dysplasia
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• Scenario 1: You are dispatched to a 2-month-old with “hemorrhage.” You arrive to find a baby in no apparent distress. Mom reports the baby is on daily aspirin for a heart condition and today has had bloody diapers when he poops. She called the cardiologist, who recommended she go to the ED. However, most concerning to you is the fact that the baby appears blue. Lungs are clear and the baby has no increased work of breathing or tachypnea. Your pulse ox shows a sat of 85% with excellent pleth/waveform. Mom says the sats are always low. What do you do?
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• Scenario 2: You are dispatched to a 1-week-old infant with “respiratory distress.” You arrive to find a lethargic, limp baby who looks grey. Oral mucosa is tinged blue. You notice increased work of breathing, tachypnea, and a very fast heartrate. Cap refill is 5-6 seconds, skin is clammy and wet. No recent ill contacts. Baby was a normal delivery, born at a birthing center 6 days ago and seemed normal until this morning. Lungs are clear to your auscultation. Pulse oximetry is not reading. – What do you think is going on? – How are you going to treat this infant?
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• Scenario 3: You are dispatched to a 2-month-old baby with “respiratory distress.” You arrive to find an alert but tired looking baby with tachypnea and some increased work of breathing. Under the baby’s eyes appear swollen, and he looks very skinny. Cap refill is 4-5 seconds, no wet diapers today. PMH from mom is that he has always gotten sweaty and “pants like a puppy” when eating from a bottle, has gotten progressively worse. Heartrate feels very fast, and lungs have crackles bilaterally. – What do you think is going on with this patient? – How will you treat him?
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What Is Congenital Heart Disease?
• Congenital = Present at birth • Wide range of severity of symptoms • Includes defects of great vessels and/or
structures of the heart
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Cyanotic vs Acyanotic Defects
• Cyan = Blue • Present when blood skips the lungs and goes out
to the body • Oxygenated blood mixes with deoxygenated
blood – Healthcare Providers can make this mixing better or
worse – without ever touching oxygen!!!!
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Normal Adult Circulation
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Normal Adult Circulation
RA
RV
LA
LV
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Normal Adult Circulation
RA
RV
LA
LV Tricuspid Valve MitraL
Valve
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Normal Adult Circulation
RA
RV
LA
LV Tricuspid Valve MitraL
Valve
Pulmonary
Artery
Aorta
Pulmonary Vein IVC, SVC
Coronary Sinus
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• t
Right Side Low Oxygen ~70%
Left Side Oxygen! ~100%
TO BODY TO LUNGS
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Shunts
Low Pressure Higher Pressure
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Shunts
Low Pressure Higher Pressure
TO BODY TO LUNGS
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Shunts
Low Pressure Higher Pressure
TO BODY TO LUNGS
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Fetal Circulation
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Fetal Circulation
ALL PRESSURES EQUAL! Oxygen sat ~60-70%
High Pressure and Fluid In Lungs
Oxygenated blood from placenta
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Fetal Circulation Foramen Ovale: Connects the right and left atria Ductus Arteriosus: Connects pulmonary artery to aorta
Placenta → Right Atrium → Left Atrium → Left Ventricle → Aorta → Body
*1/3 of blood still goes to Right Ventricle: Right Ventricle → Pulmonary Artery → Ductus Arteriosus ↑
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Ductus Arteriosus
Blood from Mom
Out to Body
High Pressure
RA
RV
LA
LV
Foramen Ovale
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Birth!
– Pressures change, blood flow changes -- PFO is pushed closed – Increased oxygen content in blood reaches
lining of the ductus arteriosus, which starts constricting and eventually closes
Baby takes first breath, fluid pushed out of lungs.
RA
RV
LA
LV
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Sometimes Fetal Circulation Isn’t Ready to Say Goodbye
• Patent Ductus Arteriosus • Patent Foramen Ovale
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Patent Ductus Arteriosus
PDA
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Patent Ductus Arteriosus (PDA)
• Connects pulmonary artery and aorta – Which way do you think the blood will flow?
• Blood backs up into the right side of the heart – What do we expect to see clinically?
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Patent Ductus Arteriosus (PDA)
• Signs in baby: – Eventually, baby tires easily, trouble eating, crackles
and murmur on auscultation (heart failure) • Only if PDA is large.
– If small, the shunt is insignificant and patient is only at risk for endocarditis.
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Congestive Heart Failure in Babies
• Tachycardia • Tachypnea with crackles in bases • Irritable at first then lethargic • Pallor/cool skin • Decreased cap refill • Mottled lower extremities • Sweaty • Hepatomegaly • May be underweight
– Big head, tiny little body • Dependent edema
– Not legs if they’re not walking or sitting up! • Eyes • Vulva/Scrotum
Develops Slowly Over Time
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This Baby is Exercising
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OXYGEN DEMAND
• Two ways to increase oxygenation: – Add Oxygen
– Take Away Less Oxygen/ Decrease Oxygen Demand
• Crying • Fever • Tachycardia
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PDA Hospital Treatment
• Close with indomethacin or ibuprofen – Why we don’t give pregnant women these drugs in
3rd trimester – If PDA doesn’t close with medical therapy, can be
closed in the cath lab with coil embolization or other device.
– Surgical closure is by ligation or metal clip
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PDA Hospital Treatment
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PDA EMS Treatment
• You won’t know it’s a PDA in your ambulance – Baby with gradual trouble breathing and crackles,
dependent edema possible. • Keep happy • Assist breathing if necessary
– Oxygen? – PPV if needed
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Blow-By Oxygen
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Nasal Cannula in Children
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Effects of Oxygen
• Oxygen is a vasodilator – Decreases pulmonary pressures – Increases blood flow to the lungs, which decreases
blood flow from the systemic circulation • Oxygen is a part of what makes the PDA close at
birth
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PDA Dependent Lesions
• The PDA usually closes within the first week of life. If the child has an undiagnosed defect that was dependent on this
shunt, the baby will experience SEVERE, ACUTE decompensation.
• EMS Presentation: – Acute rapid onset cyanosis, tachycardia, tachypnea – Signs of shock (decreased cap refill, grey
appearance)
• Treatment: Symptom-dependent, get to hospital
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PDA-Dependent Lesions Hospital Treatment: • Keep open with prostaglandin E1 infusion in hospital
(“Keeeeep open”) • Begin surgery workup with echo and consults
Prehospital Treatment: • Get to hospital as quickly as possible. Call ahead as soon as
possible with report.
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Patent Foramen Ovale (PFO)
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PFO vs Other Atrial Septal Defects (ASDs)
• PFO is technically a type of atrial septal defect • PFO is a flap, so it’s only open when pressures
are higher on the right – Thus Right to Left shunt
• Mixes deoxygenated blood with oxygenated blood • Air and thrombi can pass directly to left atrium and
then to the brain
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The Septal Defects
Atrial and Ventricular
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Atrial Septal Defect
• Creates a left-to-right shunt • Effect depends on size
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ASD Complications
• Increased blood flow to the right side of the heart and pulmonary circulation
• Over time, right atrial and ventricular dilation • Pulmonary congestion • Eventually if untreated, pressure on right side
keeps increasing until right-to-left shunt develops – Risk for emboli and stroke
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Hospital Treatment
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Hospital Treatment
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EMS Treatment
• Keep the baby happy!
• Signs of heart failure? – Oxygen Options? – PPV if needed – Support to hospital
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Ventricular Septal Defect
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VSD Complications
• All the same left-to-right complications we’ve discussed already – Pulmonary congestion, pulmonary HTN, eventual
heart failure and eventually right-to-left shunt • VSDs are larger, so L-R shunt is worse,
symptoms are worse – More commonly associated with poor feeding and
growth, rapid breathing, irritability, excessive sweating
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EMS Treatment
• Keep baby happy
• Signs of heart failure? – Oxygen ? – PPV if needed – Support to hospital
• Diuretics?
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Heart Failure vs PDA Closure
• Slow and progressive vs sudden decompensation
• Crackles vs Dry lung sounds
• Tachypnea vs Increased WOB
VS
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Eisenmenger Syndrome
• Eventually the Left to Right shunts cause enough damage that pressure is higher on the right and the shunt switches
• Right to Left Shunt = Cyanotic RIGHT now
• Left to Right shunt = Cyanotic Later
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CYANOTIC DEFECTS
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Truncus Arteriosus
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Transposition of the Great Arteries (D-type)
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PDA
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Tricuspid Atresia • “Atresia” = Absent/Never formed/Closed
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Tetraology of Fallot
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Hypercyanotic Spells
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Hypercyanotic Spells Pulmonary stenosis worsens when child is stressed Crying causes tachycardia
Right to Left shunt worsens with vasodilation: fever bowel movement ↓ blood flow to lungs, even worse than normal
↓ Systemic Vascular Resistance/ afterload ( ↓ pressure on L) ↑ Pressure on the Right = ↑ right-to-left shunt/mixed blood Can be fatal
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Treatment of the Hypercyanotic Spell
Knee to Chest Position Helps calm child and ↑ SVR/Pressure on L
Oxygen?? Can decrease pulmonary pressure, increasing blood flow to lungs. (If there is any blood getting to lungs) **Can also upset baby, worsening problem!!
Morphine? Other agents? KEEP THE BABY HAPPY!!!!
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Tetraology of Fallot Repair
Preferred to fix all at once around 6 months of age If severe, may have BT shunt placed as newborn
(manmade PDA) before sent home.
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Total Anomalous Pulmonary Venous Return
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Hypoplastic Left Heart
1. Absent or small mitral valve 2. Small ascending aorta 3. Hypoplastic LV 4. Hypoplastic ascending aorta 5. Coarctation of Aorta 6. Atrial Septal Defect
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Phase I Repair: Norwood
First few days of life
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Phase II Repair: Glenn or Hemi-Fontan
Age 2-9 months
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Phase III Fenestrated Fontan
Age 2-3 years
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Fenestrated Fontan
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Fenestrated Fontan
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Babies Post-Surgery “My baby had a fountain surgery…”
• Prone to arrythmias, typically tachyarrythmias – Ask about home medications, many on digoxin or
amiodarone or a beta blocker – Try other ways to get heartrate down including PALS
guidelines, fluid bolus 10mL/kg, rule out fever, keep happy
• Passive flow to RV means very pre-load, fluid
dependent – Respond well to fluid boluses
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Other Times It’s OK for the Baby to be Blue
• Acrocyanosis
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Other Times it’s OK to be Blue
• Are they cold? – Cutis marmorata
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BronchoPulmonary Dysplasia (BPD)
– NICU grads – Characterized by severe desaturations with irritation
progressing to bradycardia and potentially cardiac arrest
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Summary: Blue Baby Treatment
Is baby awake/able to look at you?
Is baby crying/upset in distress?
Make baby happy
Keep baby happy
Oxygen, resuscitation via
PALS or NRP algorithm
No Yes
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Review: The 5 T’s of Cyanotic Heart Defects
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Key Points to Remember
• Decreasing heart rate and oxygen demand can make a big difference!! – Calm baby down—with parents and/or medications
• Sedatives • Anti-fever medications
– Fluid bolus cautiously 10cc/kg to maximize preload/fill the tank
• Oxygen is not always helpful – Can irritate baby more (consider blow-by) – Takes blood away from systemic circulation/worsens
pulmonary congestion – Keep baby at baseline saturations, if unknown,
around 70 - 85%
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If You Have to Intubate
• Prepare for acute decompensation – Know your epi dose & have drawn up – Fluid bolus ready to go – Premedicate with Atropine – Keep vent pressures low as possible for effect (PIP
and PEEP) – If equipped with oxygen blender, try to keep FiO2 as
low as possible to goal saturation of ~70 - 85% or baseline (PALS recommends 80%)
• If patient arrests, PETCO2 will not be reliable indicator of CPR quality because pulmonary bloodflow depends on other factors
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• Scenario 1: You are dispatched to a 2-month-old with “hemorrhage.” You arrive to find a baby in no apparent distress. Mom reports the baby is on daily aspirin for a heart condition and today has had bloody diapers when he poops. She called the cardiologist, who recommended she go to the ED. However, most concerning to you is the fact that the baby appears blue. Lungs are clear and the baby has no increased work of breathing. Your pulse ox shows a sat of 85% with excellent pleth/waveform. Mom says “that number” is always low. What do you do?
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• Scenario 2: You are dispatched to a 1-week-old infant with “respiratory distress.” You arrive to find a lethargic, limp baby who looks grey. Oral mucosa is tinged blue. You notice increased work of breathing, tachypnea, and a very fast heartrate. Cap refill is 5-6 seconds, skin is clammy and wet. No recent ill contacts. Baby was a normal delivery, born at a birthing center 6 days ago and seemed normal until this morning. Lungs are clear to your auscultation. Pulse oximetry is not reading. – What do you think is going on? – How are you going to treat this infant?
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• Scenario 3: You are dispatched to a 2-month-old baby with “respiratory distress.” You arrive to find an alert but tired looking baby with tachypnea and some increased work of breathing. Under the baby’s eyes appear swollen, and he looks very skinny. Cap refill is 4-5 seconds, no wet diapers today. PMH from mom is that he has always gotten sweaty and “pants like a puppy” when eating from a bottle. Heartrate feels very fast, and lungs have crackles bilaterally. – What do you think is going on with this patient? – How will you treat him?
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References
• American Academy of Pediatrics. Pediatric Education for Prehospital Providers.-3rd edition. Jones & Bartlet, 2014.
• American Academy of Pediatrics, American College of Emergency Physicians. The Pediatric Emergency Medicine Resource-5th Edition. Jones & Bartlett, 2011.
• American Heart Association, American Academy of Pediatrics. Pediatric Advanced Life Support Provider Manual. American Heart Association, 2011.
• Anders, J.F. et al. The Sick Neonate with Cardiac Disease. Clin Pedaitr Emerg Med, 2011. 12(4): p. 12.
• Aronson, P. L. et al. The Neonate After Cardiac Surgery: What Do You Need to Worry About in the Emergency Department. Clin Pediatr Emerg Med, 2011. 12 (4): p. 10.
• Brown, K., The Infant With Undiagnosed Cardiac Disease in the Emergency Department. Clin Pediatr Emerg Med, 2005. 6: p. 7.
• Costello, J.M. et. al. Emergency Care for Infants and Children with Acute Cardiac Disease. Clin Pediatr Emerg Med 2007. 8: p. 10.
• Diaz, L.K. and L. Jones. Sedating the Child with Congenital Heart Disease. Anesthesiology Clinics, 2009. 27(2): p 301-319.
• Everett, Allen D. & Lim, Scott. Illustrated Field Guide to Congenital Heart Disease and Repair. 3rd Edition. Scientific Software Solutions 2010.
• Heiden, Ken. Congenital Heart Defects Simplified. A Pediatric Registry Review. PB Publishing 2009.