ECHO ASSESSMENT OF ATRIAL SEPTAL DEFECT

DR JULIAN JOHNY THOTTIAN

VARIOUS ECHO MODALITIES

• TTE• CONTRAST ECHOCARDIOGRAPHY• TEE• 3D ECHO• ICE

• 4 TYPESOSTIUM SECUNDUM- 66%OSTIUM PRIMUM- 15%SINUS VENOSUS-10%- superior and posterior

part of septumDEFECTS NEAR CORONARY SINUS

ASD

WHEN TO SUSPECT IN 2D ECHO

• RIGHT VENTRICULAR DILATIONABNORMAL MOTION OF IVS- brisk anterior movement in early systole or flattened movement throughout systole• ? IAS DROP OUT IN APICAL 4C VIEW• RELATIVE ATRIAL INDEX

2D ECHO

RA RV VOLUME OVERLOAD

SEPTAL FLATTENING IN DIASTOLE

RELATIVE ATRIAL INDEX

• Standard apical 4C views- right atrial area divided by left atrial area

• ROC curve analysis - cutoff value of >0.92 predicted patients with ASDs v/s matched controls with 99.1% sensitivity and 90.5% specificity. After closure, significant atrial remodeling occurred immediately, with a reduction in the mean RAI at day 1 to 0.93 ± 0.16 (P < .0001) and complete normalization at early follow-up to 0.81 ± 0.12.

The Relative Atrial Index (RAI)—A Novel, Simple, Reliable, and Robust Transthoracic Echocardiographic Indicator of Atrial Defects

Natalie A Kelly -Journal of the American Society of EchocardiographyVolume 23, Issue 3 , Pages 275-281, March 2010

SUB COSTAL 4C VIEW

• To go for the subcostal 4C – Keeps the atrial septum perpendicular to the ultrasound beam

• Distinguishes OS , OP & SV ASDs• SV ASD are consistently visualised in the

SUBCOSTAL 4C VIEW• Measurements of the septum can be taken• Anomalous drainage of pulmonary veins • Atrial septal aneurysm

TTE -views for ASD

• PSAX-IAS separates Rt &Lt atrium and runs posteriorly from NCC of aortic valve. Not seen in entirety as a result of drop out artefact

• APICAL 4C- Posterior aspect of Interatrial septum is clearly delineated in this view but drop out artefact is seen in region of fossa ovalis.

• Pulmonary venous drainage- 3 veins draining to LA• APICAL 5C VIEW- Anterior aspect of interatrial

septum

PSAX VIEW IAS AGAINST NCC OF AORTA

APICAL 4C VIEW SHOWING THE IAS AND 3 VEINS DRAINING TO LA, RT LOWER PULMONARY VEIN IS USUALLY NOT SEEN

• SUB COSTAL 4C VIEW- Useful in patients with COPD and ventilated patients

Viewed with breath held in inspiration- index marker in 3o` clock position.

No IAS drop outsSUB COSTAL SHORT AXIS- Index marker at 12o`clock

position and sweeping the transducer from midline to Rt side of patient

SUBCOSTAL 4C VIEW

SUB COSTAL SHORT AXIS VIEWALSO SHOWS IVC DRAINING TO RA AND EUSTACHIAN VALVE

Other important views

• To visualise SVC- Suprasternal short axis –index marker in 4 o`clock position

• L-SVC is seen from lt supraclvicular fossa or suprasternal short axis

• Suprasternal short axis to visualise the the pulmonary veins draining into left atrium

• Cleft mitral valve in AVCD in 12o`clock position in PSAX

SUPRASTERNAL SHORT AXIS

`Crab view` showing absent Rt upper and Rt lower pulmonary vein

En face view in 2D

• First the apical 4c view was taken. The image index marker was at approximately kept at 1 o'clock. Keeping the atrial septum and ASD in the region of interest, the transducer was rotated counterclockwise approximately 45° to 60°

Xinseng et al Journal of the American Society of Echocardiography Volume 23, Issue 7 , Pages 714-721, July 2010

A-4c view & B-En face view

Ostium primum ASD

• Defect in lower part of IAS• Associated sometimes with inlet VSD• Cleft mitral valve• AV Valve regurgitation• Partial attachment of mitral valve to IVS

Primum ASD

LARA

LV

RV

Apical four chamber view demonstratinga primum atrial septal defect

Colour Doppler flow image from same view illustrating left-to-right shunt across the primum

atrial septal defect

Fig 5

CLEFT MITRAL VALVE IN PSAX VIEW

POSTERIORLY DIRECTED JET OF MR

Ostium Secundum ASD• 10 morphological variations of defects MC-

Deficient aortic rim (42.1%). Central defects (24.2%) Deficient Inferoposterior rim (12.1%) Perforated aneurysm of the septum (7.9%) Multiple defects (7.3%) Combined deficiency of mitral and aortic rims (4.1%), Deficient SVC rim (1%), Deficient coronary sinus rim (1%). Podnar T, Martanovic P, Gavora P,Masura J. Morphological variations of secundum-type atrial septal defects: feasibility for percutaneous closure using Amplatzer septal occluders. Catheter Cardiovasc Interv 2001;53:386 –91.

Centrally located ASD imaged at 0°

ASD with deficient Aortic margin

Large ASD with deficient posterior and Aortic margins

Multiple ASDs; larger anterior defect (block arrow) and a smaller posterior defect

Sinus venosus ASD

A – INTACT IASB- COLOUR DOPPLER SHOWS DEFECT IN THE UPPER PART OF IAS AT ENTRANCE OF SVC

TEE

CORONARY SINUS ASDD

ILATED CO

RON

ARY SINU

S

TEE 120 DEGREES

ATRIAL SEPTAL ANEURYSM

CRITERIA

A-PROTRUSION OF ANEURYSM ATLEAST15MM OF PLANE OF IAS OR IAS SHOWING15MM OF PHASIC EXCURSION DURINGCARDIORESPIRATORY CYCLEB- BASE WIDTH≥ 15MM

PATENT FORAMEN OVALE

TEE -0 DEGREE

TEE-90 DEGREES

PFO WITH SECONDARY SEPTUM

COLOUR DOPPLER

• Shows the direction of the shunt • Caveat- FP results due to improper gain and

caval flow streaming near septum can be misdiagnosed as ASD.

• PULSED DOPPLER- demonstrates the flow from L to R in mid systole to mid diastole with second phase in atrial systole. Some R to L shunting occurs in early systole

• QUANTIFICATION OF SHUNT – Qp /Qs

OS ASD VIA DOPPLER SINUS VENOSUS ASD VIA DOPPLER

CONTRAST ECHOCARDIOGRAPHY

• APICAL 4C VIEW IS USED• AGITATED SALINE USED- 5ml in each 10ml

syringe, 0.5ml of air taken in the syringe and agitated to create microbubbles.

ARROW SHOWS NEGATIVE CONTRAST EFFECTDIRECT EVIDENCE OF SHUNT- NON CONTRAST BLOOD IN RA

Extent of shunting tend to focus on numbers of bubbles seen in a single still frame in the left atrium. Shunt grading incorporates : Grade 1:5 bubbles; Grade 2: 5 to 25 bubbles; Grade 3:25 bubbles; Grade 4: Opacification of chamber

Echocardiographic Evaluation of Patent Foramen Ovale Prior to Device ClosureBushra et al JACC 2010 VOL. 3, NO. 7, 2010

RIMS OF ASD

Aortic - Superoanterior Atrioventricular (AV) valve -mitral or inferoanterior Superior Vena Caval SVC – Superoposterior Inferior venacaval (IVC or Inferoposterior) Posterior (from the posterior free wall of the atria).

IVC AND SVC RIMS

OTHER RIMS

TEE

TTE

TEE 2D & 3D

2D TEE at 0o

TEE at 0° to Evaluate the Posterior and Anterior Rims of the Defect- SVC RAA level

TEE at 0° to Evaluate the Posterior and Anterior Rims of the Defect- mid septum level

TEE at 0° to Evaluate the Posterior and Anterior Rims of the Defect- At the level of the AV valves

atrioventricular valves

TEE at 90° to Evaluate the SVC and IVC Rims

AORTIC RIM IS SEEN INTEE 45 DEGREES

Probe to 30-40o right

Probe rotated 30-40o left

Special tee views for Inferoposterior rims

No Infero posterior rim with probe in normal position

Catheter Closure of Atrial Septal Defects With Deficient IVC Rim Under TEE GuidanceK.S. Remadevi, MD, FNB, Edwin Francis, DM, and Raman Krishna Kumar, DM, FACC . Catheterization and Cardiovascular Interventions (2008)

Retroflexed probe in the stomach and bought towards the esophagus and viewedIn the 70-90o view

STOP FLOW METHOD –DEVICE SIZING

DEVICE SELECTION

TEE IMAGES OF ASD DEVICE CLOSURE

3D ECHO

• Matrix transducers – pyramid shaped volumes• Full volume 3D dataset in 4-7 cardiac cycles• Ideal window is the mid esophageal basal long

axis (bicaval view)• Subcostal 4c view- enface septum• Low parasternal 4c view case of suboptimal

windows• 3D tee overcomes 3D TTE if suboptimal

windows

• Real-time 3D imaging demonstrates the changing shape of the ASD during a cardiac cycle, with maximum size in diastole

• As we take the Bicaval view structures – we first remove the right atrial free wall .

• Images are taken with suspended respiration and ECG gating with optimal gain settings

• Low gain – drop outs and high gain – blurring of structural details

Gain settingsFor Best view

Cropping toGet the IAS

TUPLE (TILT UP & LEFT)-ENFACE VIEW OF IAS FROM LT ATRIAL PERSPECTIVE

RIMS OF ASD

ASD IN VARIOUS PHASES OF CARDIAC CYCLE

ATRIAL SEPTUM ANEURYSM WITH ASD

MULTIPLE ASDs

DEFECT NEAR THE IVC

3D echo- En face 3D reconstruction of a secundum ASD with a relatively deficient

IVC and posterior rim

multiple ASDs with the thin atrial septum (*) separating the 2 defects

Measuring the ASD

Images Paediatr Cardiol. 2011 Jul-Sep; 13(3): 1–18.Three-dimensional trans-esophageal Echocardiographic Evaluation of Atrial Septal Defects: A Pictorial EssayVinay K Sharma, S Radhakrishnan, and S Shrivastava

Deployment of ASD device

INTRACARDIAC ECHO(ICE)

• 1960-1970• 9-10MHz frequency• TWO TYPES- ROTATING AND PHASED ARRAY• ROTATING TYPE -9F ,9MHz PHASED ARRAY- 5.5-10MHz • ROTATING – 360o ALONG THE TRANSVERSE PLANE &

DEPTH OF IMAGING 5CM• PHASED ARRAY- 5.5-10MHz, SECTOR OF 90o DEPTH OF

IMAGING 12CM• SHEATH SIZE 8F,9F,10F

IAS between RA & LA Long axis view

Tenting of IAS (long arrow) by needle (short arrow) approaching it from right atrium (RA)

Measurement of ASD size along long axis

Balloon stretched diameter

ADVANTAGES

• Assess ASD size and rims• Pulmonary veins assessment• Position of sheath and guide wire can be

determined.• Additional defects can also be assessed• Plan for closure

POST PROCEDURE COMPLICATIONS

RESIDUAL SHUNT POST PROCEDURE

DEVICE MISPLACEMENT

IMPINGEMENT OF THE DEVICE ON AORTIC ANNULUS- CAN LEAD TO EROSION?

CONCEPT OF `MINNESOTA WIGGLE`

DEVICE DISLODGEMENT AND ATTEMPETED SNARING

The correlations between the ASD maximal diameter by RT-3DE and operation or balloon sizing were excellent (r > 0.95). All surrounding rims of the atrial septum could be assessed on 3D

reconstruction; except for the aortic rim, a cross-sectional reconstruction was created mimicking the transesophageal echocardiographic cross section (r > 0.92)

THANK YOU

MCQ

QUESTION 1

• To view the IVC rim better we need to keep the TEE probe in

a) Neutral position in mid esophagusb) Anteflexed position in mid esophagusc) Retroflexed position in stomachd) Neutral position in high esophagus

QUESTION 2

• Cleft mitral valve is seen in a) PSAX with index marker at 12 o` clock

positionb) PSAX with index marker at 4 o` clock positionc) Subcostal short axis at 12 o` clock positiond) Subcostal short axis at 12 o`clock position

QUESTION 3

• Enface view of ASD in 2D echo is seen ina) Apical 4c viewb) Parasternal short axis viewc) Subcostal short axisd) Right parasternal view

QUESTION 4

• Most common type of ostium secundum ASD a) Deficient aortic rimb) Central defectc) Deficient posterosuperior rimd) Combined deficient mitral and aortic rim

QUESTION 5

• ATRIAL SEPTAL ANEURYSM- FALSE IS• a) Protrusion of aneurysm at least 15mm• b) IAS showing 15mm of phasic excursion

during cardiorespiratory cycle• C) Base WIDTH≥ 15MM• D) RA/ RV overload should always be

demonstrated

QUESTION 6

• IVC rim and SVC rim is evaluated in (TEE) mid esophageal

a) 90o

b) 50o

c) 0o

d) 140o

QUESTION 7

• Posterior and anterior rims are assessed in (TEE)

a) 0o

b) 50o

c) 90o

d) 140o

QUESTION 8

• Relative atrial index - A cutoff value of ------ predicted patients with ASDs v/s matched controls with 99.1% sensitivity and 90.5% specificity

a) 0.78b) 0.92c) 0.62d) 0.52

QUESTION 9

• Maximum diameter of ASD is in a) Early systoleb) Late systolec) Early diastole d) Late diastole

QUESTION 10

Aortic rim In TEE is seen in

a) Mid esophageal 0o

b) Mid esophageal 40o

c) Mid esophageal 90o

d) Gastroesophageal jn retroflexed