Một số biện pháp chức năng toàn cầu nên được đưa ra. Bất kỳ hoặc tất cả những điều sau đây có thể được sử dụng, tùy thuộc vào việc thực hành ưa thích của phòng thí nghiệm cá nhân. Khối lượng khoang LV và phân suất tống máu | Echocardiography A Practical Guide for Reporting Mid-anterior Basal anterior Mid-latcral l-anrerior Mid-posterior Short-axis parasternal view Apical lateral Apical anterior Basal septum posterior po7tt or Long-axis parasternal Mid-lateral Mid-inferior Basal lateral Basal inferior Mid-septum L Left anterior descending distribution V X Right coronary artery distribution lóóód Circumflex distribution Kxyj Left anterior desccnding circumflcx overlap Ỵ A Left anterior descend ng right coronary artery overlap Figure Arterial territories of the heart. The motion of the endocardium within each arterial territory should be described Table . A 17-segment model has been proposed for myocardial contrast studies or when comparing two different imaging modalities. This has not superseded the 16-segment model for routine use Reproduced from Segar DS et al. J Am Coll Cardiol 1992 19 1197-202 with permission Left ventricle 3. Global function Some measure of global function should be given. Any or all of the following may be used depending on the preferred practice of the individual laboratory. LV cavity volumes and ejection fraction With experience the ejection fraction can be estimated by A value to the nearest 5 or a range . 40-50 should be given since the estimate can never be precise. Otherwise systolic and diastolic volumes should be calculated. This can be done using the area-length method if the LV is symmetric but the biplane modified Simpson s rule 4- and 2-chamber views should be used if there is a wall motion abnormality. The ejection fraction EF Table is then given by the following expression diastolic volume - systolic volume EF 100 X--------------- -------------------------- diastolic volume Simpson s rule should also be used if a clinical decision rests on a threshold ejection fraction . to implant a defibrillator . Table Grading LV function by ejection fraction2 Normal Mildly abnormal Moderately abnormal Severely abnormal Stroke distance
