TY - JOUR
T1 - The usefulness of a 10% air-10% blood-80% saline mixture for contrast echocardiography
T2 - Doppler measurement of pulmonary artery systolic pressure
AU - Jeon, Doo Soo
AU - Luo, Huai
AU - Iwami, Takahiro
AU - Miyamoto, Takashi
AU - Brasch, Andrea V.
AU - Mirocha, James
AU - Naqvi, Tasneem Z.
AU - Siegel, Robert J.
N1 - Funding Information:
This work was supported in part by the Catholic University Medical College, Seoul, Korea; Western Cardiac Research Fund; the Lee E. Siegel, MD, Memorial Fund; and the Save a Heart Foundation.
PY - 2002/1/2
Y1 - 2002/1/2
N2 - OBJECTIVES: We assessed an air-blood-saline mixture for Doppler measurement of pulmonary artery systolic pressure (PASP) and the mechanism of enhancement of the Doppler signal by this mixture. BACKGROUND: Underestimation of PASP by Doppler echocardiography occurs with inadequate continuous wave (CW) signals of tricuspid regurgitation (TR). METHODS: We assessed in vitro the diameter and concentration of microbubbles of agitated air-saline mixture, air-blood-saline mixture and 10% air-10% plasma-80% saline mixture immediately, 5, 10 and 20 s after agitation. In 20 patients, PASP was estimated by Swan-Ganz catheter and CW Doppler of TR: 1) without contrast injection; 2) with intravenous injection of 10% air-90% saline; and 3) 10% blood-10% air-80% saline mixture. RESULTS: Compared to air-saline, addition of blood or plasma to the air-saline solution significantly increased the concentration of microbubbles (p < 0.001). The air-blood-saline (26.7 ± 7.2 μ) and air-plasma-saline mixture (25.3 ± 7.4 μ) had smaller microbubbles than air-saline mixture (31.6 ± 8.2 μ) (p < 0.001). The correlation between Doppler- and catheter-measured PASP at baseline (r = 0.64) improved with agitated air-saline (r = 0.86). With the air-blood-saline mixture, the correlation further improved (r = 0.92) and the best limits of agreement were obtained. CONCLUSIONS: The combination of the patient's own blood is a method of making a sterile solution of numerous small microbubbles for injection into the right-sided cardiac chambers. Clinically, the air-blood-saline mixture is easily prepared at bedside and is superior to the air-saline mixture in assessing PASP in patients with inadequate CW Doppler signals.
AB - OBJECTIVES: We assessed an air-blood-saline mixture for Doppler measurement of pulmonary artery systolic pressure (PASP) and the mechanism of enhancement of the Doppler signal by this mixture. BACKGROUND: Underestimation of PASP by Doppler echocardiography occurs with inadequate continuous wave (CW) signals of tricuspid regurgitation (TR). METHODS: We assessed in vitro the diameter and concentration of microbubbles of agitated air-saline mixture, air-blood-saline mixture and 10% air-10% plasma-80% saline mixture immediately, 5, 10 and 20 s after agitation. In 20 patients, PASP was estimated by Swan-Ganz catheter and CW Doppler of TR: 1) without contrast injection; 2) with intravenous injection of 10% air-90% saline; and 3) 10% blood-10% air-80% saline mixture. RESULTS: Compared to air-saline, addition of blood or plasma to the air-saline solution significantly increased the concentration of microbubbles (p < 0.001). The air-blood-saline (26.7 ± 7.2 μ) and air-plasma-saline mixture (25.3 ± 7.4 μ) had smaller microbubbles than air-saline mixture (31.6 ± 8.2 μ) (p < 0.001). The correlation between Doppler- and catheter-measured PASP at baseline (r = 0.64) improved with agitated air-saline (r = 0.86). With the air-blood-saline mixture, the correlation further improved (r = 0.92) and the best limits of agreement were obtained. CONCLUSIONS: The combination of the patient's own blood is a method of making a sterile solution of numerous small microbubbles for injection into the right-sided cardiac chambers. Clinically, the air-blood-saline mixture is easily prepared at bedside and is superior to the air-saline mixture in assessing PASP in patients with inadequate CW Doppler signals.
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U2 - 10.1016/S0735-1097(01)01698-9
DO - 10.1016/S0735-1097(01)01698-9
M3 - Article
C2 - 11755297
AN - SCOPUS:0037005838
SN - 0735-1097
VL - 39
SP - 124
EP - 129
JO - Journal of the American College of Cardiology
JF - Journal of the American College of Cardiology
IS - 1
ER -