Abstract:
OBJECTIVE:Air bubbles entering the coronary artery may have harmful effects on cardiac function. From the physical point of view it is the relatively high surface tension of the blood-air interface which causes bubbles to trap in small vessels. The aim of the present study was to reduce depression of myocardial function from air embolism by lowering the surface tension of air bubbles. METHODS:The effect of using antifoam as a surface-tension-reducing agent on air bubble entrapment and cardiac function was investigated in 6 anesthetized pigs (27 +/- 1 kg) and analyzed using a two-compartment diffusion model. Air bubbles with a diameter of 150 microns were selectively injected into the left anterior descending coronary artery (LADCA) in a carrying fluid in the presence or absence of antifoam. Myocardial systolic segment shortening in the LADCA region (SS-LADCA) was measured by sonomicrometry. Presence of emboli was detected by measuring the amount of reverberation of ultrasound scattered by trapped air bubbles. RESULTS:SS-LADCA transiently decreased after injections of air bubbles in both the absence and presence of antifoam. However, in the presence of antifoam the regional depression recovered to normal sooner, the average depth of the depression was reduced, and bubbles from the embolized area cleared faster. These observations can be explained by a model derived from Laplace's law.
journal_name
Cardiovasc Resjournal_title
Cardiovascular researchauthors
van Blankenstein JH,Slager CJ,Soei LK,Boersma H,Stijnen T,Schuurbiers JC,Krams R,Lachmann B,Verdouw PDdoi
10.1016/s0008-6363(97)00063-1subject
Has Abstractpub_date
1997-06-01 00:00:00pages
473-82issue
3eissn
0008-6363issn
1755-3245pii
S0008-6363(97)00063-1journal_volume
34pub_type
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