Echobasics [start] [author] [print] [impressum]

Echocardiography 5 minutes before starting  


Overview


[Echocardiographic examinations]
[Transthoracic examination]
[TEE - views]
[Stress echocardiography]
[Contrast echocardiography]
[Cardiac asynchrony]
[Strain - Strain rate]
[3D | 4D echo]
[Indications for echocardiography]
[Training in echocardiography]


[Cardiac function and PA-pressure]


[Examples of pathological findings]


Transthoracic examination


[Standard measurements]   [Normal values]


Two-dimensional views

Parasternal long axis: place the transducer approximately on the 3rd intercostal space left paraster- nal. The transducer's index mark is directed towards the patient's right shoulder. The right (RV) and the left ventricle (LV), as well as the aortic bulb (Ao) and the left atrium (LA) can be displayed.

Parasternal short axis (apical level): turn the transducer 90° clockwise from the previous posi- tion and tilt it a little bit upwards and to the left. Sometimes is will be necessary to place it one intercostal space deeper. The apex of the left (LV) and right (RV) ventricles can be displayed.

Parasternal short axis (papil- lary muscle level): from the former position tilt the transducer some downwards and to the right. The left ventricle (LV) at the level of the papillary muscles and the right ventricle (RV) can be displayed.

Parasternal short axis (mitral valve level): further tilt the transducer a little from the same position down to the right. A cross section of the left ventricle (LV) at the level of the mitral valve and the right ventricle (RV) can be displayed.

Parasternal short axis (aortic valve level): tilt transducer a little more from the same position down to the right. The aortic valve (AV), the pulmonary valve (PV), the left atrium (LA) and the right atrium (RA), as well as the tricuspid valve (TV) and the right ventricular outflow track (RVOT) can be displayed.

Apical four-chamber view: place transducer on the 5th inter- costal space, aprox. left midclavi- cular. The transducer's index mark is directed towards the patient's left side. The left (LV) and the right ventricle (RV), as well as the left (LA) and the right atrium (RA) can be displayed.

Apical two-chamber view: turn the transducer aprox. 60° counter- clockwise from the previous position. The left ventricle (LV) and the left atrium (LA) can be displayed.

Apical three-chamber view: turn the transducer further, aprox. 60° counter-clockwise from the previous position and side tilt slightly. The left ventricle (LV), the left atrium (LA) and the aortic bulb (Ao) can be displayed.

Apical five-chamber view: show a four-chamber view and then tilt the transducer slightly down. The aortic valve (AV) can be seen in the middle, between chambers. Tilting the transducer to the opposite direction, the coronary sinus can be displayed.

Subcostal view: place the transducer on the subxyphoid region. The transducer's index mark is directed towards the patient's head. The inferior vena cava (VCI) can be displayed. Turn the transducer clockwise slightly to diplay the right and left ventricle, as well as the right (RA) and left atrium.

Subcostal four-chamber view: turn the transducer aprox. 45° clockwise from the previous po- sition and tilt some. The liver (L), apex of the left (LV) and right (RV) ventricles, as well as the left (LA) and right (RA) atrium can be displayed.

Suprasternal view: place the transducer on the suprasternal region. The transducer's index mark is directed towards the patient's head and turned aprox. 45° to the right. The aortic arch (*), the neck arteries (TB, CL, SL) and the right pulmonary artery (RPA) as well as the left atrium (LA) can be displayed.



[overview]



Standard measurements - parasternal view


(1) Aortic bulb

(2) Left atrium

(3) Interventricular septum

(4) LV-EDD (end diastolic
diameter, LV)

(5) Posterior wall

(6) LV-ESD (end systolic
diameter, LV)



Measurements must always be done perpendicular to the main axis of a vessel, a chamber or atria. The aortic bulb should be measured at the beginning, the left atrium at the end of the ventricular systole. Perpendicular "cuts" from the parasternal view in adults are often not possible, short axis can be taken instead for a better orientation. A global impression from all views is necessary in order to avoid under- or overestimation of dimensions. Therefore, traditional measurements with M-Mode from parasternal can not be recommended anymore.



[overview]



Normal values

Diameters

Aortic bulb < 40 mm
Ascending aorta < 40 mm
Aortic arch < 30 mm
Descending aorta < 20 mm
Left atrium < 40 mm
Right atrium < 35 mm
Right ventricle < 30 mm
Inferior vena cava < 20 mm
Interventricular septum 6-10 mm
Posterior wall 6-10 mm
Lelft ventricle - end diastolic 40-55 mm
Left ventricle - end systolic variable


Doppler velocities

Aortic valve 1.35 (1.0 - 1.7) m/s
Mitral valve 0.90 (0.6 - 1.3) m/s
Pulmonary valve 0.75 (0.6 - 0.9) m/s
Tricuspid valve 0.50 (0.3 - 0.7) m/s


The American Society of Echocardiography has published new recommendations for chamber quantification. This document can be downloaded directly from the ASE: Recommendations for Chamber Quantification, 2005.


Prosthetic valves - normal values

Velocities depend not only from the diameter and type of the prosthesis, but also from the degree of hyperdynamia (pregnant women, hyperthyoidism, anemia), significant prosthetic valve regurgitation, and the "too-small-to-fit" phenomenon, caused by too small prosthetic valves for the native anatomic architecture.





Maximal velocity (Vmax) in m/s, peak pressure gradient (PPG) and mean pressure gradient (MPG) in mmHg. AVP = prosthetic aortic valve, MVP = prosthetic mitral valve.



[overview]