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Papillary muscle calcification after inferoposterior myocardial infarction
  1. F T Schwender
  1. Henry Ford Hospital, Department of Internal Medicine, 2799 West Grand Boulevard, Detroit, MI 48202, USA
  1. Dr Schwender

Abstract

Extensive papillary muscle calcification is quite a rare finding in echocardiographic examinations. A case of a 71 year old man with isolated calcification of the papillary muscles, detected by fluoroscopy and confirmed by echocardiography, is presented. Intracardiac calcifications in patients with prior right coronary artery occlusion and mitral regurgitation should suggest the possibility of posteromedial papillary muscle calcification and dysfunction.

  • papillary muscle
  • coronary artery disease
  • calcification

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Papillary muscle calcification has been associated with coronary artery disease, dilated cardiomyopathy, mitral valve disease, hypercalcaemia, and increased calcium phosphate product in end stage renal disease.1-3 Papillary muscle calcification was first diagnosed radiographically in 1974.4 Small calcific deposits are a common finding in elderly people and are located most commonly at the apex.1 5 Extensive papillary muscle calcification is rarely seen.

A 71 year old man with a history of hypertension, myocardial infarction in 1991 and 1994, and three vessel coronary bypass surgery in 1996 presented with an episode of unstable angina. On examination there were no signs of congestive heart failure but a 3/6 mitral regurgitation murmur was noticed. The patient was started on intravenous heparin, β blockers, and aspirin. Serial cardiac enzyme analysis showed no evidence of myocardial infarction.

Given this patient's prior history of a positive stress test in 1999, he underwent cardiac catheterisation and coronary angiography. It showed inferior akinesis, moderate mitral regurgitation, a 70% proximal stenosis of the left circumflex coronary artery which was heavily calcified, and 100% occlusion of the obtuse marginal and right coronary arteries. There was a patent venous graft to the distal right coronary artery and a small left internal mammary artery to the left anterior descending artery. Extensive calcification of the posteromedial papillary muscle and moderate calcific deposits of the anteromedial papillary muscle were noticed (fig 1). Review of an echocardiogram taken in 1998 showed an ejection fraction of 45%, normal chamber dimensions, inferior and posterior wall akinesis, and mild to moderate mitral regurgitation. The papillary muscle calcification was confirmed (fig 2). A biochemistry profile showed normal renal function and electrolytes including a normal serum calcium (8.5 mg/dl or 2.1 mmol/l) and serum phosphate (3.2 mg/dl or 1.0 mmol/l). The patient continued medical treatment and had no further cardiac symptoms three months after discharge. Six months later he presented with ischaemia of the small intestinal and died due to septic complications.

Figure 1

Coronary angiogram showing extensive posteromedial papillary muscle calcification.

Figure 2

Echocardiogram taken in 1998 confirmed calcification of the posteromedial papillary muscle.

Discussion

Calcific deposits are frequently observed in the hearts of people living in the western world. Common locations of calcification are atherosclerotic plaques in the epicardial coronary arteries, followed by the mitral anulus, aortic valve cusps, and apices of the left ventricular papillary muscles.6 Extensive papillary muscle calcification is uncommon and only scarce literature about causes and the clinical significance is available. Coronary artery disease has been described in association with papillary muscle calcification. The posteromedial papillary muscle is dependent on its blood supply from the right coronary artery, although sometimes also from a circumflex branch. In contrast, the anteromedial papillary muscle has a dual blood supply. It is believed that in some people the central artery of the papillary muscle is an “end artery” making the muscle prone to necrosis or sclerosis in the case of an ischaemic event.1The patient described had an occlusion of all coronary arteries potentially supplying the posteromedial papillary muscle.

In a study of 17 patients by Come and Riley2 an association among mitral regurgitation, congestive heart failure, and papillary muscle calcification was found.

We present a rare case of extensive calcification of the left ventricular papillary muscles diagnosed by fluoroscopy and two dimensional echocardiography. The cause of extensive calcification in this patient is unknown. The finding of intracardiac calcifications in patients with prior right coronary artery occlusion and mitral regurgitation suggests the possibility of post-ischaemic papillary muscle calcification and dysfunction.

References

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