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RV wall diastolic collapse.
![Figure 49. A. Partial early diastolic collapse and B. complete diastolic collapse of the RV free wall](https://echobyweb.com/wp-content/uploads/2022/04/Mmode_RVwallCollapse-1.jpg)
A. Partial early diastolic collapse (curved black arrow; black arrow marks beginning of diastole)
B. complete diastolic collapse of the RV free wall (thick black arrows). Asterisk: effusion.
![Figure 51. M-mode subcostal 4-chamber, RV free wall. Prolonged diastolic collapse of the RV lateral wall](https://echobyweb.com/wp-content/uploads/2022/04/tt2422_RVwallcollapse.jpg)
Figures 50-51. Prolonged diastolic collapse of the RV lateral wall (white arrow). Asterisk: pericardial effusion.
Excessive movement of the heart within the pericardial sac (the swinging heart).
![Figure 53. Excessive movement of the heart within the pericardial sac (the swinging heart).](https://echobyweb.com/wp-content/uploads/2022/04/Mmode_ExcessiveHeartMove.jpg)