Ebook A practical approach to clinical echocardiography (E): Part 2
➤ Gửi thông báo lỗi ⚠️ Báo cáo tài liệu vi phạmNội dung chi tiết: Ebook A practical approach to clinical echocardiography (E): Part 2
Ebook A practical approach to clinical echocardiography (E): Part 2
CHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________ Ebook A practical approach to clinical echocardiography (E): Part 2__Importance of the light ventricle (RV) in health and disease has seen a sea change from being just a conduit to an important contractile chamber, which significantly impacts cardiac physiology, hemodynamics and development of symptoms.1 11 is die final barrier between compensated versus decompensa Ebook A practical approach to clinical echocardiography (E): Part 2ted heart. Right ventricular musculature when stressed expresses several important enzymes and activates several signal transduction pathways involvedEbook A practical approach to clinical echocardiography (E): Part 2
in hypertrophy, fibrosis and pulmonary vasoconstriction.’ These changes hring new meaning to pharmacotherapy of heart failure and the role of die RV.CHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________ Ebook A practical approach to clinical echocardiography (E): Part 2ystemic circulation, pulmonary circulation has a much lower vascular resistance andFig. 11.1: Schnmtic diagram of kw vnpedanct: right lx:atl orciilalinn snort-axis view.greater pulmonary artery distensibilily? Under normal conditions, right-sided pressures arc significantly lower than comparable lef Ebook A practical approach to clinical echocardiography (E): Part 2t-sided pressures. Despite this, the RV ejects similar or somewhat greater volume during systole compared to the left ventricle (I.V) *0 (Figs 11.1 anEbook A practical approach to clinical echocardiography (E): Part 2
d 11.5).n PECULIARITIES OF THE RIGHT VENTRICLE• The right ventricular systolic function is predominantly afterload-dependent and minimally affected byCHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________ Ebook A practical approach to clinical echocardiography (E): Part 2s unimpressive unlike the LV. partly because myofiber orientation and muscle volume Is different (Fig. 11.7).•Highly rrabeculated and spongy appearance of rhe cavity allows it to work as an efficient volume pump but poses challenges with regard to geometric volume estimations7 (Fig. 11.8).190Section Ebook A practical approach to clinical echocardiography (E): Part 2 3 Systolic and Diastohc FunctionFig. 11.2: LMtncuton or pulmonary artery systolic pressure in normal sutyects.Fig. 11.3: LXstntxjtion or pulmonary arEbook A practical approach to clinical echocardiography (E): Part 2
tery mean pressire in normal suDiects. A mean pressure > 25 mm Hg indicates presence or pulmo-riMiy hypeileiiNkxi4002550 75 100 125 150 175RV volume (CHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________ Ebook A practical approach to clinical echocardiography (E): Part 2t or the lett ventricle {White).•Presence of a transverse moderator band prevents undue chamber dilatation and hence despite significant combined pressure and volume overload in heart failure, it is not uncommon to see minimum geometric alterations/' Ihis makes eye-balling highly deceptive in assess Ebook A practical approach to clinical echocardiography (E): Part 2ing right ventricular function (Fig. 11.9).•in advanced diseased states, outflow may become a dominant contractile chamber by virtue of its circumfereEbook A practical approach to clinical echocardiography (E): Part 2
ntial muscle orientation. Little attention has been given to the Importance of this phenomenon (Rgs 11.10 and 11.11).□ FUNCTION PARAMETERSFunction of CHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________ Ebook A practical approach to clinical echocardiography (E): Part 2troke volume is nearly similar to that of the LV.•If we assume the RV as a mechanical pump, function is its behavior in developing pressure at varying volumes during cardiac cycle.* *•Ihcrc are phases in cardiac cycle, which have variable functional importance and temporal dimension needs to be coup Ebook A practical approach to clinical echocardiography (E): Part 2led with a mechanical event for completeEchocardiography Assessment of Right Ventricular Function: Methods and Cbmcal Applications191Fig. 11.6: RightEbook A practical approach to clinical echocardiography (E): Part 2
venlriculai basal cãrc.-ianfe«intíal strain uf (Xily 49i in a normal subiect. I’sradoxcaiy. many segments Shaw arcunrerentiai lengtheningFig. 11.7: OxCHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________ Ebook A practical approach to clinical echocardiography (E): Part 2horacic echocardiography short-axis view snowing sptxigy light ssxitrkik:Fig. 11.9: I he tight ventricle ts a tnpartite structure with an inflow part indiidrig tlx: liicuspid valve apỊMralu*:, a lralxx:irf.it pail ttal iixtlixtcs pronounced trabecuiaùons that function as an absorptive sponge, tiling Ebook A practical approach to clinical echocardiography (E): Part 2 diving diastole arid rnkrasing bkxid in syslnki. and an oulfkiw tract th.il consists of a mira-Jili* hfundilxilutn, separating the: ttxnisjxd fiom thEbook A practical approach to clinical echocardiography (E): Part 2
e pulmonary valve.CHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________CHAPTEREchocardiographic Assessment of Right Ventricular Function: Methods and Clinical Applications31~1 INTRODUCTION_________________________________Gọi ngay
Chat zalo
Facebook