Congenital Heart Disease

Congenital Heart DiseaseGreg Gordon MD

Updated 2012 Version

Training for Career in Pediatric Cardiac Anesthesia

Suggested training (US & UK):

Specific Fellowship: Rare

•Pediatric Anesthesia: 12 months

•Adult Cardiac Anesthesia: 6 months

•Pediatric Cardiac Anesthesia: 6 months

•Pediatric Critical Care: 6 months

Baum V & De Souza DG. Pediatric Anesthesia 17:407, 2007White MC & Murphy TWG. Pediatric Anesthesia 17:421, 2007

?• PDA ligations• Murmurs preop• CHD patients for

noncardiac surgery

Adults with CHD in US today

2,140,000Growing 5% per year

Cahalan MK. Anesthetic Management of Patients with Heart Disease. IARS 2003 Review Course Lectures

Tammy

3 y/o with TOF s/p right BTS

For dental restorations

•Turns blue with crying

•Scheduled to undergo cardiac repair

in 3 months

•SpO2 93

•Systolic ejection murmur

•Slight clubbing of fingers

•Hct 52

(Recent oral board case)

5 y/o for T&A

Systolic murmur

• VSD

• Needs surgical closure

• Cardiologist recommended T&A first

Victor

Fran

11 y/o with tricuspid atresia

s/p Fontan procedure

•Temporary BTS at age 3

weeks

•Modified Fontan at age 3

years

•Meds: digoxin, captopril

•SpO2 88 on RA, 98 in O2

•P 67, BP 99/42

•First degree AV block

For scoliosis repair

Objectives

Participants will be able to more intelligently discuss:

• Newborn heart and lungs

• Initial evaluation the child’s heart

• Pathophysiology of selected CHDs

• Anesthetic implications of CHD

CHOP “Duct Busters”

The Newborn Heart

Provide service to 17 area NICUsSend team of 2 each

surgeons anesthesia providers

(attending + CRNA)nurses

Operate within 24 - 48 hoursMonday – Friday No weekends

Reimbursement exceeds other cardiac

servicesSusan Nicholson and Gould DS et al: Pediatrics 2003 112:1298-1301

Foramen Ovale

Functional closure first hours as LAP > RAP

Probe-patent

50% of 5-year-olds

25% of 20-year-olds

Paradoxical embolus

The Newborn Heart

The Newborn Heart

Ventricular tissue

•Fewer myocytes

•Greater proportion of connective tissue

•Relative RVHSo:

•Decreased compliance

•More sensitive to preload

The Newborn Heart

Normally near peak of Starling curveStroke volume relatively fixedC.O. relatively heart rate dependent

•Near peak of Starling curve

•Stroke volume relatively fixed

•C.O. relatively heart rate dependent

Ca+

+

The Newborn Heart

Newborn myocardium derives relatively high fraction of activator Ca from the extracellular pool, so

Beware Ca channel blockers

The Preterm Infant Heart

More sensitive to depressant effects of inhaled agentsDecreased response to catecholamines

Relatively high PVR persists

Pulmonary vasculature more sensitive to vasoconstriction by:

Hypoxia

Acidosis

Hypercarbia

CHD Pearl

murmur in newborn =

benign disease

Initial evaluation of child’s heart

History: To determine

•Level of function

•CHF


History - cyanosis

•Turn blue?

•At rest?

•When crying?

•Passes out?

•Stops playing and squats


History - CHF

Run around like crazy?

Like sibs?

Or tends to be quiet, slow?

Infant – feeding behavior:

Slow to finish bottle?

Sweats when nursing?

Eyes puffy in the morning?


Physical exam

•Listen to heart first when/if infant quiet(warm stethoscope)

•First concentrate on S1 and especially S2

Louder than normal?Split normally?

•Systolic murmur:Starts after or obscures S1?

•Diastolic murmur?•Widely radiating murmur?•Palpate liver•BP in arm and leg•Tongue - cyanosis

CHD Pearl

Sudden CHF in ‘healthy’ 10-day-old =

complicated coarct

General Approach to CHD Patient

1.Define cardiovascular pathology

2.Predict pathophysiology

3.Determine hemodynamic goals

4.Anticipate emergency treatments

Cahalan MK. Anesthetic Management of Patients with Heart Disease. IARS 2003 Review Course Lectures

Don’t worry

Almost any anesthetic technicmay be used in any CHD patient

if

the anesthesiologist understands

•the pathophysiology of the lesion and

•the pharmacology of the drugs employed.

Normal Neonate

1 week SVC

RA

RV

MPA

PV

LA

LV

Ao

m=2

30/3

30/12 m=18

m=4

80/5

80/50

60

65

65

65

99

99

99

Some basic definitions

physiologicL to R shunt =

lungs to lungs shunt

Blood that is returning to the heart

from the lungs is recirculated back

to the lungs without going out to the

rest of the body.


physiologicR to L shunt =

body to body shunt


from the body is recirculated directly

back to the body without going to the

lungs to be oxygenated.


effective pulmonaryblood flow=

body to lungs flow


from the body that is actually directed

to the lungs to be oxygenated.


Nonrestrictive VSD

VSD large enough that

pressure equalizes in the two ventricles

(no pressure gradient can be maintained)

LV pressure = RV pressure

SVC

RA

RV

MPA

PV

LA

LV

AoPDA

Premature1 week old

28 weeks EGA

65/2565/30

65/1265/10

96

96

92

65

65

80

to R arm& head To L arm

MHMC PDA ligation

http://metrohealthanesthesia.com/edu/ped/chd6.htm#PDALigation

CHD Pearl

blue newborn +

no airway or breathing problem +

quiet heart =

decreased PBF lesion (TOF)

Tammy

Tetralogy Of Fallot

Most common cyanotic lesion

NB: cyanosis plus quiet heart

Diminished pulmonary blood flow

Ao ejection click

Hypercyanotic “tet” spells

tachypnea, pallor, LOC, less murmur

Tammy

1.Define cardiovascular pathology

2.Predict pathophysiology

3.Determine hemodynamic goals

4.Anticipate emergency treatments

3 y/o with TOF s/p right BTS

Tammy

Tetralogy Of Fallot

Essentially a duality:1. severe RVOT obstruction plus2. nonrestrictive VSD

With anatomic consequences:1.RVH2.Overriding aorta

And physiologic consequences1.R to L shunt2.Diminished pulmonary blood flow

Tetralogy of Fallot

SVC

RA

RV

MPA

LA

LV

Ao

40

40

40

96

85

50

m=5

85/6

15/10

m=4

85/5

85/45

Tammy

Tetralogy Of Fallot

s/p right BTS?

Blalock-Taussig Shunt

Thomas-Blalock-Taussig Shunt

Vivien Thomas, Partners of the Heart, 1998 andSomething the Lord Made - Best Made-for-TV Movie, 2004

Helen Taussig

Alfred Blalock

Vivien Thomas

November 29, 1944Thomas-Blalock-Tuassig

Dr. Blalock does the Blalock(Johns Hopkins)

Systemic to Pulmonary Shunts

Tammy

Tetralogy Of Fallot

Avoid dehydration, especially if polycythemic

Maintain adequate tissue oxygenation

1.Avoid increasing O2 demand2.Maintain SVR, systemic BP3.Minimize PVR

Oral premed/inductionmidazolam + ketamine

Free written board answer:

Speed of induction:

R->L shunt• Inhalational: slower• IV: faster

L->R shunt• Inhalational: maybe faster• IV: slowerBut probably not clinically important

Tanner et al. Anesth Analg 64:101, 1985

Beware:

blunted chemoreceptor response to

hypoxemiaTammy

Beware:

Tammy

VD:VT may be 0.6And increase with•start of mechanical ventilation•too much PEEP•hypovolemia

ETCO2 << PaCO2

Tammy

Tetralogy Of Fallot

Minimize R->L Shunt

MAINTAIN SVR•ketamine•phenylephrine

Tammy

Tetralogy Of Fallot

Minimize RVOT obst & PVR

•oxygen•beta blocker ready

Maybe:•nitroglycerin•phentolamine•tolazoline•prostaglandin E1

•nitric oxide

Tammy

Tetralogy Of Fallot

And of course:

•No Air in lines

infective endocarditis prophylaxis

and

Maybe no N2O

Infective Endocarditis Prophylaxis

Infective endocarditis prophylaxis

for dental procedures is

reasonable only for patients with

underlying cardiac conditions

associated with

the highest risk of adverse

outcome from infective

endocarditis.

Wilson W, Taubert KA et al. AHA Guidelines. Prevention of Infective Endocarditis. Circulation 116:1736-54, 2007

Infective Endocarditis Prophylaxis Recommended

Unrepaired cyanotic CHD,

including palliative

shunts and conduits.

Circulation 116:1736, 2007


CHD completely repaired with

prosthetic material or device

less than 6 months ago.



Repaired CHD with

residual defect(s) at or near

a prosthetic patch or device.



Prosthetic material in a valve.

Previous infective endocarditis.

Valvulopathy after transplant.



Wilson W, Taubert KA et al. AHA Guidelines. Prevention of Infective Endocarditis. Circulation 116:1736-54, 2007

For patients with the above conditions,

prophylaxis is reasonable for

all dental procedures that involve

manipulation of gingival tissue or

the apical region of teeth or

perforation of the oral mucosa.

Infectious Endocarditis Prophylaxis


NOT Recommended

Any form of CHD not listed above

Local injection -> noninfected tissue

Shedding deciduous teeth

Bleeding/trauma to lips, oral mucosa

Tammy

Tetralogy Of Fallot

and

SVRmaintain

infective endocarditis prophylaxis

Tetralogy Of Fallot

Treatment of Tet Spell

•Knee-chest position

•O2

•Morphine 0.1-0.2 mg/kg IM,IV

•Phenylephrine gtts : increase systolic BP 20-40

mmHg

•Beta blockade, e.g. propanolol: titrate to 0.1

mg/kg

•ABG: NaHCO3 if necessary

•Surgery

CHD Pearl

blue newborn +

no airway or breathing problem +

hyperactive heart =

TGA

(Recent oral board case)

5 y/o for T&A

Systolic murmur

• VSD

• Needs surgical closure

• Cardiologist recommended T&A first

Victor

Newborn VSD

Most common lesion

2/3rds close spontaneously

Small VSD

Definite murmur

Will probably close

Large VSD

No murmur

No problems

Home with Mom

CHF symptoms by 4-8 weeks

VSD

SVC

RA

RV

MPA

LA

LV

Ao

m=6

90/8

90/35

m=12

90/10

90/60

60

80

88

96

94

94

nonrestrictive

98

Nonrestrictive VSD

Victor

L->R shunt

Pulmonary to System Flow Ratio

QP:QS = SaO2 – SvO2__________

SpvO2 – SpaO2

=94 - 60_______98 - 88

= 3.4:1

Nonrestrictive VSD

Victor

Besides, of course:

•No Air in linesMaybe no N2O

and

infectious endocarditis prophylaxis

Proper management of the physiologic

abnormalities is more important

than the choice of specific anesthetic

and pharmacologic approaches.

Nonrestrictive VSD

Victor

Maintain PVR

Lower SVR better

Normal ventilation(paCO2 = 40’s)

FIO2 < 1

Major inhalational agents

Thiopental, propofol

Fran

11 y/o with tricuspid atresia

s/p Fontan procedure

•Temporary BTS at age 3

weeks

•Modified Fontan at age 3

years

•Meds: digoxin, captopril

•SpO2 88 on RA, 98 in O2

•P 67, BP 99/42

•First degree AV block

For scoliosis repair

Fran

Tricuspid Atresia3rd most common cyanotic CHD1. TOF2. TGA

20% extracardiac abnormalities•GI•Musculoskeletal

Cyanosis•Mixing in LA•Decreased PBF•Spells

Type IB most common•Small VSD (and RV)•PS

ModifiedBidirectional

Modified

16/10

16/1288/6

Age 5 years

Fran

11 y/o with tricuspid atresia s/p Fontan procedure

Potential problems during scoliosis repair

CHF1. Volume shifts2. Anemia3. Hypertension

Paradoxical embolus

Thrombosis Vena cavae RA Pulmonary arteries

Hypoxemia1. Hypovolemia2. Low PBF

Fran

11 y/o with tricuspid atresia s/p Fontan procedure

Goals during scoliosis repair

Monitor RA pressure•RA catheter•Maintain starting pressure

Maintain systemic BP near baseline

Minimize myocardial depressants

NO AIR IN LINESNo N2O

Relatively high FIO2

Normal Hct

16/10

16/1288/6

Age 5 years

For more cool stuff about CHDcheck out the lesson and fun Quiz at

http://greggordon.org/edu/ped/chd1.htm

http://greggordon.org/edu/ped/chd1.htm

Now we can more intelligently discuss:

• Newborn heart and lungs

• Initial evaluation the child’s heart

• Pathophysiology of selected CHD

• Anesthetic implications of CHD

Congenital Heart Disease

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