What is the clinical evidence from this study?

Study design: Observational. Population: Obstructed mechanical heart valve prostheses (n=100). Intervention: Surgical management (valve replacement or declotting). Primary outcome: Early mortality.

What question did this study set out to answer?

To evaluate clinical features and surgical management strategies for obstructed mechanical heart valve prostheses.

June 13, 2026

Obstruction of mechanical heart valve prostheses: Clinical aspects and surgical management

Key Result

Surgical management of obstructed mechanical heart valves had an early mortality rate of 12.3%, with significantly higher perioperative mortality in NYHA class IV patients (17.5% vs 4.7%, p<0.05).

Key Points

To evaluate clinical features and surgical management strategies for obstructed mechanical heart valve prostheses.
Analysis of surgical procedures conducted on 100 patients with obstructed mechanical valves between 1980 and 1989.
Data collected on patient demographics, valve types, anticoagulant therapy, and functional class at time of obstruction.
Operative procedures included valve replacement, declotting, and management of thrombus and pannus.
Early mortality rate was 12.3% across all procedures, with no significant difference between mitral (12.2%) and aortic (13.7%) surgeries.
In functional class IV, the perioperative mortality rate was significantly higher at 17.5% (p < 0.05) compared to lower classes (4.7%).
For valve replacement, the mortality rate was 12% for those procedures, while declotting had a 13% mortality rate.

Study Design

Type

Observational (n=100)

Structured PICO

What are the clinical characteristics and surgical outcomes of patients with obstructed mechanical heart valve prostheses?

Population

100 patients (median age 32 years, 68% female) undergoing 106 surgical procedures for obstructed mechanical heart valve prostheses between 1980 and 1989.

Exposure

Surgical management including valve replacement (n=81) or valve declotting and excision of pannus (n=23).

Outcome

Early mortality ratehard clinical

Surgical management of obstructed mechanical heart valves carries a 12.3% early mortality rate, which is significantly higher in patients presenting in NYHA class IV.

Abstract

One hundred patients (32 male) aged 5 months to 82 years (median 32 years) underwent 106 surgical procedures for 112 mechanical prosthetic valves obstructed by a thrombus (n = 61) or pannus (n = 7), or both (n = 44), between January 1, 1980 and December 31, 1989. The position of the obstructed prosthesis was aortic in 51 patients (48%), mitral in 49 (46%) and both aortic and mitral in 6 (6%). The types of obstructed prosthetic valves were Björk-Shiley (n = 51), St. Jude (n = 41) and Medtronic-Hall (n = 20). The time interval between valve replacement and obstruction ranged from 6 weeks to 13 years (median 4 years). Of 63% of patients in whom coagulation variables were available at the time of obstruction, 70% were receiving inadequate anticoagulant therapy. In 63% of the procedures the patient was in New York Heart Association functional class IV. Two patients underwent preoperative thrombolysis with incomplete results. Operative procedures included valve replacement (n = 81), valve declotting and excision of pannus (n = 23) and aortic valve replacement and mitral valve declotting (n = 2). The early mortality rate was 12.3% (13 patients), and there was no difference between surgery for mitral prostheses (12.2%) versus aortic prostheses (13.7%). The perioperative mortality rate was 17.5% (11 of 63 patients) in patients in functional class IV and 4.7% (2 of 43 patients) in those in functional classes I to III (p less than 0.05). For valve replacement, the mortality rate was 12% (10 of 81 patients) and for declotting of the prosthesis 13% (3 of 23 patients).(ABSTRACT TRUNCATED AT 250 WORDS)

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