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b line lung ultrasound heart failure diagnosis lung slliding ivc collapsibility distensibility congestive heart failure septic shock shock copd pulmonary embolishm echo reverberation heart failure a line resus ultrasound presentation pocus asthma suthaporn lumlertgul resuscitation lichtenstein ultrasound lumlertgul powerpoint cardiac output echo in sepsis mods pneumothorax point of care ultrasound