Hemodynamic evaluation of patients with double-valve prostheses

Area of Science:

• Cardiology
• Cardiac Surgery
• Medical Devices

Background:

• Limited literature exists on evaluating patients with post-operative double mechanical heart valve prostheses.
• Symptomatic patients with mechanical prostheses in both mitral and aortic positions present diagnostic challenges.

Purpose of the Study:

• To review hemodynamic data from symptomatic patients with double mechanical heart valve prostheses.
• To identify difficulties and establish precise measurements for evaluating these complex patients.

Main Methods:

• Retrospective review of 27 double-valve cases undergoing left ventricular catheterization.
• Analysis of hemodynamic parameters including pulmonary wedge pressures, prosthesis gradients, and valve areas.
• Invasive measurements were obtained via transapical or retrograde left ventricular entry.

Main Results:

• 68% of patients (17 of 25) had elevated pulmonary wedge pressures.
• Calculated mitral valve areas ranged from 0.3 to >3.0 cm², and aortic valve areas from 0.9 to >3.0 cm².
• Low calculated valve areas sometimes lacked apparent stenosis, and one patient had a misdiagnosis.

Conclusions:

• Hemodynamic evaluation of symptomatic double-prosthesis patients is difficult and potentially risky.
• Precise invasive measurements and knowledge of valve size are essential for accurate assessment.
• The distinction between acceptable values and parameters requiring reoperation is narrow for mechanical prostheses.