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A right atrial mass: thrombus or not?

Mean exhaled concentration was different from all patients except patient 6. Sampling was stopped when active treatment was withdrawn. Patient 6 (Fig. 1C) was moribund after a self-inflicted poisoning with pyrogallum (wood paneling varnish). He had a high mean ethane concentration. He was extremely acidotic (pHo7) with multi-organ failure, undergoing plasmapheresis the first hour and hemofiltration the last 1.5 h of sampling period. Several peaks were related to recorded clinical events. Peaks of ethane of short duration occur in breath of intensive care patients. These surges may have clinical interest as fewer were observed for patients 1, 2 and 4, which had less serious conditions than the others. In patients 3, 5 and 6, peaks were more frequent, and some had a timely relation to a recorded clinical event such as administration of drugs, pulmonary toilette and arrhythmias. It can also be speculated whether higher mean concentrations may indicate a serious condition. The study has shown that surges of ethane occur in critically ill patients. Their role may be determined in the future if continuous online electronic recordings of physiological and clinical variables are combined with new developments in laser technology allowing for continuous monitoring of breath ethane (9, 10).