|Other names||Tricuspid regurgitation|
|Diagram of the heart with a black arrow showing the location and direction of the abnormal blood flow|
|Symptoms||Few symptoms initially, may develop peripheral swelling, liver enlargement, ascites|
|Complications||Heart failure, atrial fibrillation|
|Causes||Pulmonary hypertension, infective endocarditis, hyperthyroidism, Ebstein anomaly, rheumatic heart disease, carcinoid syndrome, connective tissue disorder, lupus, pulmonary valve stenosis, certain medications such as fenfluramine|
|Diagnostic method||Suspected based on a systolic murmur, confirmed by echocardiogram|
|Differential diagnosis||Mitral regurgitation|
Tricuspid insufficiency (TI), also known as tricuspid regurgitation (TR), is a type of valvular heart disease in which there is backward flow of blood from the right ventricle, through the tricuspid valve, into the right atrium, when the heart contracts. Early on few symptoms may be present. Later on heart failure may develop with peripheral swelling, liver enlargement, and ascites. Other complications may include atrial fibrillation.
Causes include pulmonary hypertension, infective endocarditis, hyperthyroidism, Ebstein anomaly, rheumatic heart disease, carcinoid syndrome, connective tissue disorder, lupus, pulmonary valve stenosis, and certain medications such as fenfluramine. The diagnosis may be syspected based on a systolic murmer and confirmed by an ultrasound of the heart.
Treatment depends on the underlying cause and the severity. In those with left-sided heart failure furosemide and salt restriction may be recommended. Tricuspid valve surgery may be recommended in those with severe disease with significant symptoms or when repairing other valves. In cases were the valve is infected it may be removed without immediate replacement. Outcomes are generally good.
Triscuspid insufficiency is relatively common. The percentage of people newly affected per year is about 0.9% in the United States. Males and females are affected equally frequently. Surgery to replace the tricuspid valve was first described in 1963.
Signs and symptoms
A pansystolic heart murmur may be heard on auscultation of the chest. The murmur is usually of low frequency and best heard on the lower left sternal border. It increases with inspiration, and decreases with expiration: this is known as Carvallo's sign. However, the murmur may be inaudible due to the relatively low pressures in the right side of the heart. A third heart sound may also be present, also heard at the lower sternal border, and increasing in intensity with inspiration.
On examination of the neck, there may be giant C-V waves in the jugular pulse. With severe TR, there may be an enlarged liver detected on palpation of the right upper quadrant of the abdomen; the liver may be pulsatile on palpation and even on inspection.
The causes of TR may be classified as congenital or acquired; another classification divides the causes into primary or secondary. Congenital abnormalities are much less common than acquired. The most common acquired TR is due to right ventricular dilatation. Such dilatation is most often due left heart failure or pulmonary hypertension. Other causes of right ventricular dilatation include right ventricular infarction, inferior myocardial infarction, and cor pulmonale.[medical citation needed]
In regards to primary and secondary causes they are:
- Primary causes
- Secondary causes
In terms of the mechanism of tricuspid insufficiency it involves the expansion of the tricuspid annulus (fibrous rings of heart). Tricuspid insufficiency is linked to geometric changes of the tricuspid annulus (decreased tricuspid annular release). The leaflets shape are normal but prevented from normal working mechanism due to a distortion of spatial relationships of leaflets and chords. It is also contemplated that the process via which tricuspid regurgitation emerges, is a decrease of contraction of the myocardium around the annulus,
The diagnosis of TR may be suspected if the typical murmur of TR is heard. Severe TR may be suspected if right ventricular enlargement is seen on chest x-ray, and other causes of this enlargement are ruled out.
Generally, medical rather than surgical treatment of TR is recommended if the cause is right ventricular dilatation or left-sided heart failure.
Tricuspid valve replacement using either a mechanical prosthesis or a bioprosthesis may be indicated. (Mechanical prostheses may cause thrombo‐embolic phenomena, bioprostheses may have a degeneration problem). Some evidence suggests that there are no significant differences between a mechanical or biological tricuspid valve in a recipient.
Surgery vs. no surgery for TR has been statistically assessed by looking back on consecutive series of hospital cases, mainly of secondary causes. In these cases, one finds that surgery predicts outliving non-surgery cases initially matched in health ~60% of the time (HR = .74).
The prognosis of TR is less favorable for males than females. Survival rates are proportional to TR severity; but even mild TR reduces survival compared to those with no TR. If the TR is due to left heart failure or pulmonary hypertension, prognosis is usually dictated by these conditions, not the TR.[medical citation needed]
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