cardiac disease in pregnancy. physiological changes in the cardiovascular system during pregnancy a...

Cardiac Disease Cardiac Disease in Pregnancy in Pregnancy

Physiological Changes Physiological Changes in the Cardiovascular System in the Cardiovascular System

During PregnancyDuring Pregnancy

• A thorough knowledge – essential

• In order to understand – the additional impact of cardiac disease

Physiological Changes 1Physiological Changes 1

• The first cardiovascular change associated with pregnancy

• Peripheral vasodilation (induced by progesterone)

• leading to • A decrease in systemic vascular

resistance

Physiological Changes 2Physiological Changes 2• Cardiac output increases • 8 weeks : 20%• 20-28 weeks :40-50% • Stroke volume increase 80ml/t

– ventricular end-diastolic volume– wall muscle mass– contractility

• Heart rate increase– 10 to 15 beats per minute

Physiological Changes 3Physiological Changes 3• Labour leads to further increases in

cardiac output • In the first stage: 15%• In the second stage: 50%

– abdominal pressure plummeted– pain and anxiety : sympathetic

stimulation– pulmonary artery pressure increased– blood back into the circulation with each

uterine contraction: 300-500 ml

Physiological Changes 4Physiological Changes 4• After delivery, cardiac output increases

again immediately : 60-80%– sudden interruption of placental circulation– uterine contraction – relief of caval compression– within 1 h: rapid decline to pre-labour values

• Puerperium: – uterine contractions– retented Interstitial fluid returned to circulation– return to normal after 2 weeks

Physiological Changes 5Physiological Changes 5

• The greatest change period in systemic blood circulation and heart burden– 32 to 34 weeks– Intrapartum– 3 days postpartum

• Easily induced heart failure

Table 1   -- Normal Hemodynamic Changes During Pregnancy

Hemodynamic Parameter

Change During Normal Pregnancy

Change during labor and delivery

Change during postpartum

Blood volume ↑ 40-50% ↑ ↓ (autodiuresis)

Heart rate ↑ 10-15 beats/min ↑ ↓

Cardiac output ↑ 30-50 % ↑ additional 50% ↓

Blood pressure ↓ 10 mm Hg ↑ ↓

Stroke volume ↑ 1st and 2nd trimester;↓ 3rd trimester

↑ (300-500 mL per contraction)

↓

Systemic vascular resistance

↓ ↑ ↓

Types of CD during pregnancyTypes of CD during pregnancy

• Congenital heart disease• Rheumatic heart disease• Hypertensive disorders in pregnancy

heart disease• Peripartum cardiomyopathy• Other

Congenital heart Congenital heart diseasedisease• Left → right shunt

• ① atrial septal defect    

• ② ventricular septal defect    

• ③ patent ductus arteriosus

• No shunt    ① pulmonary artery stenosis    ② coarctation of the aorta    ③ Marfan syndrome

• right → Left shunt:

• Tetralogy of Fallot 、 Eisenmenger's

syndrome

Rheumatic heart disease

• Mitral incompetence: isolated • can tolerance pregnancy, delivery and

puerperium.

Mitral stenosis:1Blood volume (during pregnancy)2Blood volume back to the heart (intrapartum and early puerperium)

Pulmonary venous hypertension Acute pulmonary edema

Pulmonary circulation volume

Left atrial pressure

Rheumatic heart disease

• Aortic stenosis: severe• Pulmonary edema • Low discharge capacity heart failure• Aortic incompetence : severe • Left ventricular failure • Bacterial endocarditis

HDIP heart diseaseHDIP heart disease • No history of heart disease and signs • Sudden onset of systemic failure left ventricular failure

Peripheral small artery resistance increasedMyocardial ischemia, interstitial edema,

hemorrhage and necrosis spots

Blood viscosity increased to promote myocardial ischemia

water, sodium retention

HDIP heart diseaseHDIP heart disease• Misdiagnosed as the flu and

bronchitis• Early diagnosis is important• After eliminate the cause, most can

be restored

Peripartum Cardiomyopathy Peripartum Cardiomyopathy (PPCM)(PPCM)

• Define: dilated cardiomyopathy

• Interval: between the last 3 month of pregnancy up to the first 6 months postpartum

• Women : without preexisting cardiac dysfunction

• Fetal death:10~30%

• Maternal mortality is approximately 9%

– heart failure, pulmonary infarction,

arrhythmia

• These women should be counseled against subsequent pregnancies

PPCMPPCM• The exact etiology : unknown• Possible causes

– infection, immunity, multiple pregnancy, hypertension, malnutrition

– viral myocarditis– automimmune phenomena– specific genetic mutations

PPCMPPCM• Symptoms• Fatigue• Dyspnea on exertion, orthopnea• Nonspecific chest pain• Abdominal discomfort and distension• palpitations, cough, hemoptysis,

hepatomegaly, edema• other heart failure symptoms

PPCMPPCM• Typical signs• Heart enlarged • Myocardial contractility reduce • Ejection function reduced

• ECG: • Arrhythmias• left ventricular hypertrophy• ST segment and T wave abnormalities

CD main threat to pregnant CD main threat to pregnant women women

• Heart failure• Subacute infective

endocarditis• Hypoxia and cyanosis• Venous thrombosis and

pulmonary embolism

The impact of CD in The impact of CD in pregnant women pregnant women

• A validated cardiac risk score • Predict a maternal chance of having

adverse cardiac complications

Risk factor 0 1 >1

Maternal cardiac

event rates5% 27% 75%

Table 2 Risk factor and maternal cardiac event rates

Table3 Predictors of Maternal Risk for Cardiac ComplicationsTable3 Predictors of Maternal Risk for Cardiac Complications

Criteria Example Points*

Prior cardiac events

heart failure, transient ischemic attack, stroke before present pregnancy

1

Prior arrhythmia

symptomatic sustained tachyarrhythmia or bradyarrhythmia requiring treatment

1

NYHA III/IV or cyanosis

1

Valvular and outflow tract obstruction

aortic valve area <1.5 cm2, mitral valve area <2 cm2, or left ventricular outflow tract peak gradient > 30 mm Hg

1

Myocardial dysfunction

LVEF <40% or restrictive cardiomyopathy or hypertrophic cardiomyopathy

1

Maternal Cardiac Lesions and Risk Maternal Cardiac Lesions and Risk of Cardiac Complicationsof Cardiac Complications

• Low Risk • Atrial septal defect• Ventricular septal defect  • Patent ductus arteriosus• Asymptomatic aortic stenosis with low

mean gradient (<50 mm Hg) and normal LV function (>50%)

• Aortic regurgitation with normal LV function and NYHA functional class I or II 

little

Maternal Cardiac Lesions and Risk Maternal Cardiac Lesions and Risk of Cardiac Complicationsof Cardiac Complications

• Low Risk  • Mitral valve prolapse

– (isolated or with mild to moderate mitral regurgitation and normal LV function)

• Mitral regurgitation with normal LV function and NYHA class I or II

• Mild to moderate mitral stenosis– (mitral valve area >1.5 cm2, mean gradient <5 mm Hg)

without severe pulmonary hypertension)• Mild/moderate pulmonary stenosis• Repaired acyanotic congenital heart disease

without residual cardiac dysfunction

Maternal Cardiac Lesions and Risk Maternal Cardiac Lesions and Risk of Cardiac Complicationsof Cardiac Complications

• Intermediate Risk • Large left-to-right shunt• Coarctation of the aorta• Marfan syndrome with a normal aortic root• Moderate to severe mitral stenosis• Mild to moderate aortic stenosis• Severe pulmonary stenosis

Maternal Cardiac Lesions and Risk Maternal Cardiac Lesions and Risk of Cardiac Complicationsof Cardiac Complications

• High Risk • Eisenmenger's syndrome• Severe pulmonary hypertension• Complex cyanotic heart disease

– (tetralogy of Fallot, Ebstein's anomaly, truncus arteriosis, transposition of the great arteries, tricuspid atresia)

• Marfan syndrome with aortic root or valve involvement  

Maternal Cardiac Lesions and Risk Maternal Cardiac Lesions and Risk of Cardiac Complicationsof Cardiac Complications

• High Risk• Uncorrected severe aortic stenosis with or

without symptoms• Uncorrected severe mitral stenosis with NYHA

functional class II-IV symptoms• Aortic and/or mitral valve disease (stenosis or

regurgitation) with moderate to severe LV dysfunction (EF <40%)

• NYHA class III-IV symptoms associated with any valvular disease or with cardiomyopathy of any etiology

• History of prior peripartum cardiomyopathy

The impact of CD in The impact of CD in FetalFetal• Premature birth• Low birth weight• Respiratory distress• Fetal death• Neonatal death• Genetic heart disease

DiagnosisDiagnosis• History:• Palpitations, difficulty breathing

or heart failure• Organic heart disease• Rheumatic fever

DiagnosisDiagnosis• Signs and symptoms abnormal: • Exertional dyspnea, Paroxysmal nocturnal

dyspnea , orthopnea, hemoptysis, recurrent exertional chest pain

• Cyanosis, clubbing, jugular vein engorgement continuing

• Cardiac auscultation– a diastolic murmur and/or grade Ⅲ or rough

systolic murmur over the whole– a pericardial friction rub, diastolic gallop,

alternating pulse

Early signs of heart failureEarly signs of heart failure • Chest tightness, palpitations,

shortness of breath after mild activity

• Resting heart rate> 110 beats / min • Respiration> 20 times / min• Paroxysmal nocturnal dyspnea• The end of the lung wet rales

persisted

Diagnosis:Diagnosis:auxiliary examination

• Noninvasive testing of the heart may include:• ECG: severe arrhythmias

– atrial fibrillation, atrial flutter, Ⅲ degree atrioventricular block, ST segment and T wave abnormalities and changes

• Chest radiograph– the heart was significantly expanded

• Echocardiogram– expansion of the heart chamber– myocardial hypertrophy– valvular motion abnormalities– cardiac structural abnormalities

ManagementManagement

• Before pregnancy: – detailed examination to determine

whether she is suitable to pregnant• access to counselling

– specialized – multidisciplinary – preconception

• In order to empower them to make choices about pregnancy

Not suitable for pregnancyNot suitable for pregnancy ！！• Cardiac function grade Ⅲ ~ Ⅳ• Those who previously had heart failure• A pulmonary hypertension, severe stenosis

the main A• Ⅲ atrioventricular block, atrial fibrillation,

atrial flutter,diastolic gallop;• Cyanotic heart disease• Active rheumatic or bacterial endocarditis

The main aims of The main aims of managementmanagement

• To optimize the mother's condition during the pregnancy– considering ß-blockers– Thromboprophylaxis– pulmonary arterial vasodilators

• To monitor for deterioration• Minimize any additional load on the

cardiovascular system

Pregnant womenPregnant women with CD with CD• Should be assessed clinically as soon as possible • A multidisciplinary team and appropriate

investigations undertaken• The core members of the team should include:• Suitably experienced obstetricians• Cardiologists• Anaesthetists• Midwives• Neonatologists• Intensivists

ManagementManagement of gestation period

• Regular prenatal care• Early prevention of heart failure

– adequate rest– appropriate weight limit– treatment the motivation of heart failure

: infection, anemia,PIH

• The treatment of heart failure – as same as those who are not pregnant

Mode of DeliveryMode of Delivery• Vaginal delivery:

– cardiac function Ⅰ ~ Ⅱ grade – not a fetal macrosomia– cervical conditions are good

ManagementManagement in intrapratumintrapratum• First stage of labor• Semi-recumbent position,• oxygen masks, attention Bp, R, P,

heart rate,– cedilanid : 0.4mg +5% GS20ml iv slow

(when necessary)– antibiotics : during labor to 1 week after

postpartum

ManagementManagement in intrapratumintrapratum • Low-dose regional analgesia:usually

recommended • providing effective pain relief• reduce the further increases in

– cardiac output – myocardial oxygen demand

• Be careful not to inhibit the neonatal breathing

ManagementManagement in intrapratumintrapratum• Second stage of labor:

– episiotomy, facilitate instrumental delivery to shorten the stage

• Third stage of labor:– Ergot disabled to prevent venous pressure

increased– injection of morphine or pethidine immediately

postpartum – abdominal pressure sandbags – control the liquid velocity

Mode of DeliveryMode of Delivery• Cesarean section:

– Marfan syndrome : expansion of the aortic root> 45 mm

– use warfarin during delivery– sudden hemodynamic deterioration– severe pulmonary hypertension and

severe aortic stenosis

ManagementManagement in puerperium• Monitoring heart rate, blood oxygen,

blood pressure during delivery 24 hours

• She could not breast-feeding – more than grade Ⅲ cardiac function

• Prophylactic antibiotics• High-level maternal surveillance

Thanks four your listening