Cardiac depression after experimental air embolism in pigs: role of addition of a surface-active agent.

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 Res

journal_title

Cardiovascular research

authors

van Blankenstein JH,Slager CJ,Soei LK,Boersma H,Stijnen T,Schuurbiers JC,Krams R,Lachmann B,Verdouw PD

doi

10.1016/s0008-6363(97)00063-1

subject

Has Abstract

pub_date

1997-06-01 00:00:00

pages

473-82

issue

3

eissn

0008-6363

issn

1755-3245

pii

S0008-6363(97)00063-1

journal_volume

34

pub_type

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