Regional Myocardial Function at the Papillary Muscle Insertion Site.

Regional myocardial function at the papillary muscle insertion site.

The importance of the mitral apparatus to the global left ventricular (LV) function has been suggested in several clinical studies. One recent study reported that chordal transsection induced an unloading of myocardium at the papillary muscle insertion site. We hypothesized that the regional response for afterloading at this site with intact mitral apparatus was different from that at the free ...

Papillary muscle rupture following myocardial infarction.

Papillary Muscle Rupture after Acute Myocardial Infarction

Mitral regurgitation (MR) after myocardial infarction is a relatively common complication and its incidence is about 50%. One cause of MR after myocardial infarction is papillary muscle rupture, and this situation usually requires urgent surgical treatment. Since prognosis is favorable with early surgical intervention, early diagnosis of the underlying cause of mitral regurgitation is very impo...

Resuspension of the uninfarcted papillary muscle at the time of mitral valve replacement in a patient with post myocardial infarction papillary muscle rupture.

A 60-year-old woman was referred to the Department of Cardiovascular Surgery of Social Insurance Chukyo Hospital for the rupture of a postinfarction papillary muscle. The rupture was in the posterior part of the anterolateral papillary muscle, in which more than two-thirds of its posterior leaflet was prolapsed. Mortality from the surgical repair of a papillary muscle rupture is quite high. For...

Assessment of papillary muscle function in the intact heart.

A technique is described to localize the anterolateral papillary muscle and to assess its performance in vivo. Using this technique, we measured sequentially the pressure generated within the anterolateral papillary muscle and its changes in length during the cardiac cycle in eight open-chest anesthetized dogs. Pressure within the anterolateral papillary muscle was measured with a 1.6 mm diamet...