Assessment of the sensitivity of hydrogen inhalation in the detection of left-to-right shunting.
For the detection of left-to-right intracardiac shunting, the oximetric and standard indocyanine green techniques are relatively insensitive, in that neither can reliably detect a shunt with a ratio of pulmonary to systemic flow (Qp/Qs) less than 1.3 (percentage shunt, 23%). Although the hydrogen inhalation method is said to be much more sensitive in this regard, no previous study has measured its sensitivity. Accordingly, in 15 patients (4 men, 11 women, aged 38 to 67 years) without intracardiac shunting, hydrogen inhalation was performed 1) without and 2) with an artificially created femoral arteriovenous shunt of known size, and cardiac output was measured by thermodilution. For the 15 subjects with cardiac outputs of 3.64 to 8.10 liters/min, shunts of 22 to 248 ml/min were created, so that the shunts ranged from 0.5% to 3.3%. Hydrogen inhalation detected all shunts greater than or equal to 1.3% (Qp/Qs greater than or equal to 1.01). Of the 10 shunts less than 1.3%, it detected 5, with the smallest being 0.7%. Thus, the hydrogen inhalation technique is extremely sensitive in identifying the presence of left-to-right shunting, far more sensitive than the oximetric and standard indocyanine green methods.
Department of Internal Medicine (Cardiovascular Division), University of Texas Southwestern Medical Center, Dallas 75235.
E D
ED
Flores
R A
RA
Lange
J B
JB
Bedotto
R S
RS
Danziger
L D
LD
Hillis
D000328:Adult; D000368:Aged; D006328:Cardiac Catheterization; D002302:Cardiac Output; D003326:Coronary Circulation / Q000502:physiology; D005260:Female; D006343:Heart Septal Defects / Q000175:diagnosis*; D006801:Humans; D006859:Hydrogen; D007201:Indicator Dilution Techniques; D007208:Indocyanine Green; D008297:Male; D008875:Middle Aged; D010092:Oximetry; D013815:Thermodilution
D006859:Hydrogen; D007208:Indocyanine Green