The Bubble Test for Diagnosis of Hepatopulmonary Syndrome

TUTORIALconditions, such particles will not enter the left atrium or systemic circulation.If indeed the microbubbles are found in the left atrium or ventricle, or organs such as the kidneys or brain, it may suggest the existence of an intrapulmonary or intracardiac right-to-left shunt. 5A Valsalva maneuver can be used to detect right-to-left shunt, such as a PFO: the patient is asked to breath in and hold the breath while pulling in the abdominal wall for approximately 10 seconds, and then asked to release.This maneuver raises right atrial pressure, and consequently, any existing flap in the atrial wall will open, shunting blood from the right atrium to the left atrium during atrial systole.This technique is used to diagnose a PFO, reducing the number of false-positive findings of IPVD. 4 The source of the shunt can be identified by the bubble test, based on the timing when the left-sided bubbles are seen following injection.In intracardiac shunting (ICS), bubbles are seen in the chambers of the left heart three cardiac cycles after they are seen in the right side; however, in intrapulmonary shunting, the bubbles appear in the left side after four to six cardiac cycles. 6 39-year-old patient with decompensated CLD (MELD Na score 28 and Child-Pugh score C) was admitted with difficulty in breathing.Oxygen saturation on a nonrebreather mask was about 80%, necessitating high-flow nasal oxygen.He was found to have gross ascites and mild pleural effusion.Abdominal paracentesis