Abstract
Patent foramen ovale (PFO) is a frequent congenital anomaly, but massive right-to-left shunt (RTLS) is normally prevented by higher pressures in left heart chambers. However, mechanical ventilation with positive end-expiratory pressure (PEEP) can significantly increase right atrial pressure, accentuating the RTLS, mainly after major cardiothoracic surgery. We report a patient admitted to the intensive care unit after cardiac surgery. Pre- and intraoperative transesophageal echocardiography only described an aneurysmal interatrial septum with no shunt. However, high-PEEP ventilation induced a paradoxical response with life-threatening hypoxemia, triggering further echocardiographic evaluation, revealing massive RTLS across a stretch PFO. Provocative maneuvers (Valsalva/PEEP) significantly increase echocardiographic sensitivity, unmasking silent PFO. (c) 2016 Wiley Periodicals, Inc. J Clin Ultrasound 45:58-61, 2017.
Original language | English |
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Pages (from-to) | 58-61 |
Number of pages | 4 |
Journal | Journal of Clinical Ultrasound |
Volume | 45 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 1 2017 |
Keywords
- Aged
- Echocardiography, Transesophageal/methods
- Foramen Ovale, Patent/diagnostic imaging/physiopathology
- Humans
- Male
- Positive-Pressure Respiration
- Ultrasonography, Doppler, Color/methods
- Valsalva Maneuver
- echocardiography
- paradoxical response to positive end-expiratory pressure
- patent foramen ovale
- provocative maneuvers
- right-to-left shunt