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J Thorac Cardiovasc Surg 1996;112:708-711
© 1996 Mosby, Inc.
SURGERY FOR ACQUIRED HEART DISEASE |
At the request of the Councils of The Society of Thoracic Surgeons (STS) and The American Association for Thoracic Surgery (AATS), the Ad Hoc Liaison Committee for Standardizing Definitions of Prosthetic Heart Valve Morbidity "revisited" the Guidelines published in September 1988.
1-3 The purpose of the review was to update and clarify definitions within the guidelines and to consider recommendations made by others. 4,5 The variety of cardiac valvular procedures has expanded since 1988; therefore, in this document the term operated valve indicates prosthetic and bioprosthetic heart valves of all types, operated or repaired native valves, and allograft and autograft valves. The term operated valve includes any cardiac valve altered by a surgeon during an operation.
Much morbidity and mortality is a direct consequence of the interaction between the patient and operated valve(s), although patient variables (e.g., age, degree of coronary arterial disease, follow-up care) may be more responsible for outcomes than an operated valve. However, no set of guidelines can identify all possible patient factors that may affect morbidity and mortality. General agreement regarding the following definitions of terms and suggestions for reporting data does not preclude more detailed analyses or constructive recommendations, and investigators are encouraged to identify relevant patient factors in addition to factors related to operated valves.
Purpose
The purpose of these guidelines is to facilitate the analysis and reporting of results of operations on diseased cardiac valves. The definitions and recommendations that follow are guidelines, not standards, and are designed to facilitate comparisons between the experiences of different surgeons who treat different cohorts of patients at different times with different techniques and materials.
Mortality
Thirty-day mortality (sometimes termed operative mortality) is death within 30 days of operation regardless of the patient's geographic location. Follow-up for 30-day mortality must be complete. Hospital mortality is death within any time interval after operation if the patient is not discharged from the hospital. Hospital to hospital transfer is not considered discharge; transfer to a nursing home or rehabilitation unit is considered hospital discharge unless the patient subsequently dies of complications of the operation.
Definitions of morbidity
Structural valvular deterioration (SVD).
Any change in function (a decrease of one New York Heart Association functional class or more) of an operated valve resulting from an intrinsic abnormality of the valve that causes stenosis or regurgitation.
Structural valvular deterioration includes operated valve dysfunction or deterioration exclusive of infection or thrombosis as determined by reoperation, autopsy, or clinical investigation. The term structural deterioration refers to changes intrinsic to the valve, such as wear, fracture, poppet escape, calcification, leaflet tear, stent creep, and suture line disruption of components (e.g., leaflets, chordae) of an operated valve.
Nonstructural dysfunction.
Any abnormality resulting in stenosis or regurgitation at the operated valve that is not intrinsic to the valve itself.
Nonstructural dysfunction refers to nonstructural problems that result in dysfunction of an operated valve exclusive of thrombosis and infection diagnosed by reoperation, autopsy, or clinical investigation. Examples of nonstructural dysfunction include entrapment by pannus, tissue, or suture, paravalvular leak, inappropriate sizing or positioning, residual leak or obstruction from valve implantation or repair, and clinically important hemolytic anemia.
Sudden or progressive dysfunction or deterioration of the operated valve may be structural, nonstructural, or both as determined by reoperation, autopsy, or clinical investigation.
Valve thrombosis.
Any thrombus, in the absence of infection, attached to or near an operated valve that occludes part of the blood flow path or that interferes with function of the valve.
Valve thrombosis may be documented by operation, autopsy, or clinical investigation.
Embolism.
Any embolic event that occurs in the absence of infection after the immediate perioperative period (when anesthesia-induced unconsciousness is completely reversed).
A neurologic event includes any new, temporary or permanent, focal or global neurologic deficit. A transient ischemic attack (TIA) is a fully reversible neurologic event that lasts less than 24 hours. A reversible ischemic neurologic deficit (RIND) is a fully reversible neurologic deficit that lasts more than 24 hours and less than 3 weeks. A stroke or permanent neurologic event lasts more than 3 weeks or causes death. Psychomotor deficits determined by specialized testing are not considered neurologic events related to operated valves. Patients who do not awaken or who awaken after operation with a new stroke are excluded in tabulations of valve-related morbidity.
A peripheral embolic event is an operative, autopsy, or clinically documented embolus that produces symptoms from complete or partial obstruction of a peripheral (noncerebral) artery. Patients who awake with a myocardial infarction are excluded. Patients who have a myocardial infarction after the perioperative period are also excluded unless a coronary arterial embolus is shown to be the cause of the infarction by operation, autopsy, or clinical investigation. Emboli proven to consist of nonthrombotic material (e.g., atherosclerosis, myxoma) are excluded.
Bleeding event (formerly anticoagulant-related hemorrhage).
Any episode of major internal or external bleeding that causes death, hospitalization, or permanent injury (e.g., vision loss) or necessitates transfusion.
The complication bleeding event applies to all patients whether or not they are taking anticoagulants or antiplatelet drugs, since bleeding events can occur in patients who are not receiving anticoagulants. Embolic stroke complicated by bleeding is classified as a neurologic event under embolism and is not included as a separate bleeding event.
The warfarin anticoagulant status closest to the time that the patient has valve thrombosis, embolism, or a bleeding event should be reported in international normalized ratio units. Whether or not patients were receiving a platelet inhibitory drug (e.g., aspirin, dipyridamole) should also be reported.
Operated valvular endocarditis.
Any infection involving an operated valve.
The diagnosis of operated valvular endocarditis is based on customary clinical criteria including an appropriate combination of positive blood cultures, clinical signs, and histologic confirmation of endocarditis at reoperation or autopsy. Morbidity associated with active infection, such as valve thrombosis, thrombotic embolus, bleeding event, or paravalvular leak, is included under this category and is not included in other categories of morbidity.
Consequences of morbid events
Reoperation.
Any operation that repairs, alters, or replaces a previously operated valve.
The reasons for reoperation should be reported and may include reasons other than valve-related morbidity, such as recall, excessive noise, or incidental or prophylactic removal. Enzymatic or catheter-aided therapy of valve-related morbidity is not considered reoperation, but the morbid event that prompted the intervention should be reported.
Valve-related mortality.
Death caused by structural valvular deterioration, nonstructural dysfunction, valve thrombosis, embolism, bleeding event, operated valvular endocarditis, or death related to reoperation of an operated valve. Sudden, unexplained, unexpected deaths of patients with an operated valve are included as valve-related mortality. Deaths caused by heart failure in patients with advanced myocardial disease and satisfactorily functioning cardiac valves are not included. Specific causes of valve-related deaths should be designated and reported.
Sudden, unexpected, unexplained death.
The cause of these deaths is unknown and the relationship to an operated valve is also unknown. Therefore, these deaths should be reported as a separate category of valve-related mortality if the cause cannot be determined by clinical data or autopsy.
Cardiac death.
All deaths resulting from cardiac causes. This category includes valve-related deaths (including sudden unexplained deaths) and non-valve-related cardiac deaths (e.g., congestive heart failure, acute myocardial infarction, documented fatal arrhythmias).
Total deaths.
All deaths resulting from any cause after a valve operation.
Permanent valve-related impairment.
Any permanent neurologic or other functional deficit caused by structural valvular deterioration, nonstructural dysfunction, valve thrombosis, thrombotic embolism, bleeding event, operated valvular endocarditis, or reoperation.
Data collection
Data collection and reporting for all operated valves should include valve location (aortic, mitral, tricuspid, pulmonary, aortic and mitral, mitral and tricuspid) and category of operated valve (i.e., aortic pericardial bioprosthesis, fresh aortic allograft, mechanical mitral prosthesis, tricuspid ring annuloplasty). For prosthetic valves, including bioprostheses, the manufacturer and model should be reported with designation of different models and manufacturers. For allograft and xenograft valves the method of preservation should be given. Valve sizes for each category of valve, valve model, and valve location should be stated.
Additional pertinent material.
In addition each report should specify:
Data analysis and reporting.
The method of reporting data should facilitate comparison between reports and support the conclusions, inferences, and predictions made. Some methods that may be useful are discussed below. The methods chosen to analyze the collected data will be influenced by the purpose of the report and the availability of various analytical techniques. Methods used in the collection and analysis of data should be defined in the Methods section by references or defined in an appendix.
As with cardiac surgery, statistical science is a dynamic discipline and the methods used may vary between statisticians. However, in all reports the conclusions, predictions, and inferences made should be supported by the collected data and appropriate analysis of the data.
Percentages (not time-related).
Some morbid events that occur within a short time frame (such as the interval between operation and 30 days or hospital discharge) may be reported as a simple percentage, that is, the number of events divided by the number of patients (e.g., percent operative mortality). Percentages should be presented with confidence intervals 6 and may be compared by 
2 analysis of Fisher's exact test. 7 Logistic regression 8 is available for evaluating the simultaneous influence of several risk factors on a dichotomous outcome variable (percentage) and is often used to establish a risk model, that is, a mathematical formula that incorporates such factors.
Time-related events.
Most valve-related events should be reported in a time-related manner, with operation designated as time zero. Kaplan-Meier 9 or other life table techniques 10 provide actuarial estimates of morbid events and should be reported with the standard error of the estimate or with appropriate (usually 67% or 95%) confidence limits. The number of patients remaining at risk should be indicated at appropriate intervals, and curves should not be extrapolated beyond time frames containing very few patients. Although comparisons between subsets of patients can be made, actuarial methods are not predictive beyond the time of the last actuarial estimate and cannot be adapted to multivariate analysis. These methods are called nonparametric or distribution-free because they do not assume a particular statistical distribution or model.
The Cox proportional hazard model 11 produces time-dependent analysis of valve-related events and provides a multivariable, stepwise regression method to identify risk factors associated with specific valve-related morbid events during specific time intervals. The Cox method is a semiparametric (model partly specified) approach, which makes no assumption about the shape of the underlying hazard function, but identifies risk factors and estimates multipliers of the baseline hazard that are the relative risks associated with the risk factors. Several methods are available for assessing the assumption of proportional hazards. 12 The results of a multivariable analysis should be accompanied by a list of the variables considered and a tabular presentation of the numerical results.
A fully parametric method (model completely specified) of calculating a hazard function of valve-related morbid events defines the instantaneous risk of an event at any time after operation. 13-16 Such methods permit univariate and multivariate analysis, provide predictive information beyond the time of the last event, indicate whether the risk is constant, and provide confidence limits.
Linearized rates.
Some of the aforementioned methods have been extended to consider repeated events in the same patient, although the software is not widely available. A simple and widely used approach uses "linearized" rates (events per 100 patient-years or percent per year, calculated as the number of events divided by the total patient-years) to summarize the incidence of multiple events in individual patients. These rates should be considered only approximate unless the hazard function for the complication under study is constant during the entire time interval considered (which is often not true with regard to the early postoperative period) and unless the risk of recurrent events is the same as for initial events (which is often not the case). Linearized rates should be reported with confidence limits, which can be based on the Poisson distribution 17 or on likelihood ratio methods for comparing the means of exponential distributions. 11,18 Linearized rates can be compared using the likelihood ratio test 15,16,19 or a test based on the F-statistic. 11,16
Cumulative incidence.
The hazard function for a given morbid event represents a potential risk; its realization as an actual occurrence is influenced by the competing risks of other events, such as death or explant, which may terminate the valve's use before the event being analyzed can occur. The usual actuarial estimates 9,10 assume that such terminating events are eliminated; it may be useful to determine the actual probability of occurrence, often called the cumulative incidence, which is less than that estimated by the usual actuarial method. 4
The Committee thanks all respondents who contributed to this document and especially Eugene H. Blackstone, MD, who provided particularly valuable criticism and information.
Footnotes
This article is being published concurrently in The Journal of Thoracic and Cardiovascular Surgery, The Annals of Thoracic Surgery, and the European Journal of Cardio-Thoracic Surgery. 
*Members, Ad Hoc Liaison Committee for Standardizing Definitions of Prosthetic Heart Valve Morbidity of The American Association for Thoracic Surgery and The Society of Thoracic Surgeons.
J THORAC CARDIOVASC SURG 1996;112:708-11
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A. J. Bryan, C. A. Rogers, K. Bayliss, J. Wild, and G. D. Angelini Prospective randomized comparison of CarboMedics and St. Jude Medical bileaflet mechanical heart valve prostheses: Ten-year follow-up J. Thorac. Cardiovasc. Surg., March 1, 2007; 133(3): 614 - 622. [Abstract] [Full Text] [PDF]
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T. Bove, Y. Van Belleghem, K. Francois, F. Caes, H. Van Overbeke, and G. Van Nooten Stentless and stented aortic valve replacement in elderly patients: factors affecting midterm clinical and hemodynamical outcome Eur. J. Cardiothorac. Surg., November 1, 2006; 30(5): 706 - 713. [Abstract] [Full Text] [PDF]
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S. K. Singh, G. H.L. Tang, M. D. Maganti, S. Armstrong, W. G. Williams, T. E. David, and M. A. Borger Midterm Outcomes of Tricuspid Valve Repair Versus Replacement for Organic Tricuspid Disease Ann. Thorac. Surg., November 1, 2006; 82(5): 1735 - 1741. [Abstract] [Full Text] [PDF]
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G. L. Grunkemeier, R. Jin, and A. Starr Prosthetic heart valves: objective performance criteria versus randomized clinical trial. Ann. Thorac. Surg., September 1, 2006; 82(3): 776 - 780. [Abstract] [Full Text] [PDF]
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A. Kulik, P. Bedard, B-K. Lam, F. D. Rubens, P. J. Hendry, R. G. Masters, T. G. Mesana, and M. Ruel Mechanical versus bioprosthetic valve replacement in middle-aged patients. Eur. J. Cardiothorac. Surg., September 1, 2006; 30(3): 485 - 491. [Abstract] [Full Text] [PDF]
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C. Valfre, G. Rizzoli, C. Zussa, P. Ius, E. Polesel, S. Mirone, T. Bottio, and G. Gerosa Clinical results of Hancock II versus Hancock Standard at long-term follow-up. J. Thorac. Cardiovasc. Surg., September 1, 2006; 132(3): 595 - 601.e2. [Abstract] [Full Text] [PDF]
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G. Rizzoli, S. Mirone, P. Ius, E. Polesel, T. Bottio, L. Salvador, C. Zussa, G. Gerosa, and C. Valfre Fifteen-year results with the Hancock II valve: A multicenter experience. J. Thorac. Cardiovasc. Surg., September 1, 2006; 132(3): 602 - 609.e4. [Abstract] [Full Text] [PDF]
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R. O. Bonow, B. A. Carabello, K. Chatterjee, A. C. de Leon Jr, D. P. Faxon, M. D. Freed, W. H. Gaasch, B. W. Lytle, R. A. Nishimura, P. T. O'Gara, et al. ACC/AHA 2006 Guidelines for the Management of Patients With Valvular Heart Disease: A Report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Writing Committee to Revise the 1998 Guidelines for the Management of Patients With Valvular Heart Disease) Developed in Collaboration With the Society of Cardiovascular Anesthesiologists Endorsed by the Society for Cardiovascular Angiography and Interventions and the Society of Thoracic Surgeons J. Am. Coll. Cardiol., August 1, 2006; 48(3): e1 - e148. [Full Text] [PDF]
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W. B. Eichinger, I. M. Wagner, S. Bleiziffer, F. von Canal, R. Gunzinger, D. J. Ruzicka, U. Busch, R. Bauernschmitt, and R. Lange Occasional Single Beat Regurgitation Observed with the Medtronic Advantage Bileaflet Heart Valve Ann. Thorac. Surg., August 1, 2006; 82(2): 537 - 541. [Abstract] [Full Text] [PDF]
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B. Lima, G. C. Hughes, A. Lemaire, J. Jaggers, D. D. Glower, and W. G. Wolfe Short-Term and Intermediate-Term Outcomes of Aortic Root Replacement with St. Jude Mechanical Conduits and Aortic Allografts Ann. Thorac. Surg., August 1, 2006; 82(2): 579 - 585. [Abstract] [Full Text] [PDF]
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S. Mohammadi, R. Baillot, P. Voisine, P. Mathieu, and F. Dagenais Structural deterioration of the Freestyle aortic valve: Mode of presentation and mechanisms. J. Thorac. Cardiovasc. Surg., August 1, 2006; 132(2): 401 - 406. [Abstract] [Full Text] [PDF]
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A. Sampath Kumar, S. Talwar, A. Saxena, R. Singh, and D. Velayoudam Results of mitral valve repair in rheumatic mitral regurgitation Interactive CardioVascular and Thoracic Surgery, August 1, 2006; 5(4): 356 - 361. [Abstract] [Full Text] [PDF]
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A. Ali, J. C. Halstead, F. Cafferty, L. Sharples, F. Rose, R. Coulden, E. Lee, J. Dunning, V. Argano, and S. Tsui Are Stentless Valves Superior to Modern Stented Valves?: A Prospective Randomized Trial Circulation, July 4, 2006; 114(1_suppl): I-535 - I-540. [Abstract] [Full Text] [PDF]
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M. Ruel, V. Kapila, J. Price, A. Kulik, I. G. Burwash, and T. G. Mesana Natural History and Predictors of Outcome in Patients With Concomitant Functional Mitral Regurgitation at the Time of Aortic Valve Replacement Circulation, July 4, 2006; 114(1_suppl): I-541 - I-546. [Abstract] [Full Text] [PDF]
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O. Lund and M. Bland Risk-corrected impact of mechanical versus bioprosthetic valves on long-term mortality after aortic valve replacement J. Thorac. Cardiovasc. Surg., July 1, 2006; 132(1): 20 - 26. [Abstract] [Full Text] [PDF]
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V. Chan, W.R.E. Jamieson, E. Germann, F. Chan, R.T. Miyagishima, L.H. Burr, M.T. Janusz, H. Ling, and G.J. Fradet Performance of bioprostheses and mechanical prostheses assessed by composites of valve-related complications to 15 years after aortic valve replacement J. Thorac. Cardiovasc. Surg., June 1, 2006; 131(6): 1267 - 1273. [Abstract] [Full Text] [PDF]
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T. Aybek, S. Dogan, P. S. Risteski, A. Zierer, T. Wittlinger, G. Wimmer-Greinecker, and A. Moritz Two hundred forty minimally invasive mitral operations through right minithoracotomy. Ann. Thorac. Surg., May 1, 2006; 81(5): 1618 - 1624. [Abstract] [Full Text] [PDF]
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A. A. Aroussi, I. M. Sami, A. Leguerrier, and J. P. Verhoye The blower: a useful tool to complete thrombectomy of the mechanical prosthetic valve. Ann. Thorac. Surg., May 1, 2006; 81(5): 1911 - 1912. [Abstract] [Full Text] [PDF]
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M. Ruel, H. Al-Faleh, A. Kulik, K. L. Chan, T. G. Mesana, and I. G. Burwash Prosthesis-patient mismatch after aortic valve replacement predominantly affects patients with preexisting left ventricular dysfunction: Effect on survival, freedom from heart failure, and left ventricular mass regression J. Thorac. Cardiovasc. Surg., May 1, 2006; 131(5): 1036 - 1044. [Abstract] [Full Text] [PDF]
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J. B. Chambers, H. M. Rimington, F. Hodson, R. Rajani, and C. I. Blauth The subcoronary Toronto stentless versus supra-annular Perimount stented replacement aortic valve: Early clinical and hemodynamic results of a randomized comparison in 160 patients J. Thorac. Cardiovasc. Surg., April 1, 2006; 131(4): 878 - 882. [Abstract] [Full Text] [PDF]
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N. Luciani, G. Nasso, A. Anselmi, F. Glieca, M. Gaudino, F. Girola, M. Piscitelli, M. Perisano, L. Martinelli, and G. Possati Repeat Valvular Operations: Bench Optimization of Conventional Surgery Ann. Thorac. Surg., April 1, 2006; 81(4): 1279 - 1283. [Abstract] [Full Text] [PDF]
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Are allografts the biologic valve of choice for aortic valve replacement in nonelderly patients? Comparison of explantation for structural valve deterioration of allograft and pericardial prostheses. J. Thorac. Cardiovasc. Surg., March 1, 2006; 131(3): 558 - 564.e4.
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A. Kulik, F. D. Rubens, P. S. Wells, C. Kearon, T. G. Mesana, J. van Berkom, and B.-K. Lam Early Postoperative Anticoagulation After Mechanical Valve Replacement: A Systematic Review Ann. Thorac. Surg., February 1, 2006; 81(2): 770 - 781. [Abstract] [Full Text] [PDF]
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A. Sampath Kumar, S. Talwar, A. Saxena, and R. Singh Ross procedure in rheumatic aortic valve disease Eur. J. Cardiothorac. Surg., February 1, 2006; 29(2): 156 - 161. [Abstract] [Full Text] [PDF]
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T. Aybek, P. Risteski, A. Miskovic, A. Simon, S. Dogan, U. Abdel-Rahman, and A. Moritz Seven years' experience with suture annuloplasty for mitral valve repair J. Thorac. Cardiovasc. Surg., January 1, 2006; 131(1): 99 - 106. [Abstract] [Full Text] [PDF]
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K. Minami, A. Zittermann, S. Schulte-Eistrup, H. Koertke, and R. Korfer Mitroflow Synergy Prostheses for Aortic Valve Replacement: 19 Years Experience With 1,516 Patients Ann. Thorac. Surg., November 1, 2005; 80(5): 1699 - 1705. [Abstract] [Full Text] [PDF]
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A. Repossini, I. Kotelnikov, R. Bouchikhi, T. Torre, B. Passaretti, O. Parodi, and V. Arena Single-suture line placement of a pericardial stentless valve J. Thorac. Cardiovasc. Surg., November 1, 2005; 130(5): 1265 - 1269. [Abstract] [Full Text] [PDF]
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W.R. E. Jamieson, L. H. Burr, R. T. Miyagishima, E. Germann, J. S. MacNab, E. Stanford, F. Chan, M. T. Janusz, and H. Ling Carpentier-Edwards supra-annular aortic porcine bioprosthesis: Clinical performance over 20 years J. Thorac. Cardiovasc. Surg., October 1, 2005; 130(4): 994 - 1000. [Abstract] [Full Text] [PDF]
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S. Talwar, R. Mohapatra, A. Saxena, R. Singh, and A. S. Kumar Aortic Homograft: A Suitable Substitute for Aortic Valve Replacement Ann. Thorac. Surg., September 1, 2005; 80(3): 832 - 838. [Abstract] [Full Text] [PDF]
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J. Chambers, J. Roxburgh, C. Blauth, J. O'Riordan, F. Hodson, and H. Rimington A randomized comparison of the MCRI On-X and CarboMedics Top Hat bileaflet mechanical replacement aortic valves: Early postoperative hemodynamic function and clinical events J. Thorac. Cardiovasc. Surg., September 1, 2005; 130(3): 759 - 764. [Abstract] [Full Text] [PDF]
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A. S. Kumar, S. Talwar, R. Mohapatra, A. Saxena, and R. Singh Aortic Valve Replacement With the Pulmonary Autograft: Mid-Term Results Ann. Thorac. Surg., August 1, 2005; 80(2): 488 - 494. [Abstract] [Full Text] [PDF]
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G. Polvani, F. Barili, L. Dainese, M. Muratori, M. Porqueddu, A. Sala, and P. Biglioli Long-Term Results After Aortic Valve Replacement With the Bravo 400 Stentless Xenograft Ann. Thorac. Surg., August 1, 2005; 80(2): 495 - 501. [Abstract] [Full Text] [PDF]
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B. Meyns, R. Jashari, M. Gewillig, L. Mertens, A. Komarek, E. Lesaffre, W. Budts, and W. Daenen Factors influencing the survival of cryopreserved homografts. The second homograft performs as well as the first Eur. J. Cardiothorac. Surg., August 1, 2005; 28(2): 211 - 216. [Abstract] [Full Text] [PDF]
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M. Shiono, Y. Sezai, A. Sezai, M. Hata, M. Iida, and N. Negishi Long-Term Results of the Cloth-Covered Starr-Edwards Ball Valve Ann. Thorac. Surg., July 1, 2005; 80(1): 204 - 209. [Abstract] [Full Text] [PDF]
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S. Talwar, C. Saikrishna, A. Saxena, and A. Sampath Kumar Aortic Valve Repair for Rheumatic Aortic Valve Disease Ann. Thorac. Surg., June 1, 2005; 79(6): 1921 - 1925. [Abstract] [Full Text] [PDF]
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W.R.E. Jamieson, O. von Lipinski, R.T. Miyagishima, L.H. Burr, M.T. Janusz, H. Ling, G.J. Fradet, F. Chan, and E. Germann Performance of bioprostheses and mechanical prostheses assessed by composites of valve-related complications to 15 years after mitral valve replacement J. Thorac. Cardiovasc. Surg., June 1, 2005; 129(6): 1301 - 1308. [Abstract] [Full Text] [PDF]
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S. Talwar, M. R. Rajesh, A. Subramanian, A. Saxena, and A. S. Kumar Mitral valve repair in children with rheumatic heart disease J. Thorac. Cardiovasc. Surg., April 1, 2005; 129(4): 875 - 879. [Abstract] [Full Text] [PDF]
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J. Bucerius, J. F. Gummert, T. Walther, M. A. Borger, N. Doll, V. Falk, and F. W. Mohr Impact of Off-Pump Coronary Bypass Grafting on the Prevalence of Adverse Perioperative Outcome in Women Undergoing Coronary Artery Bypass Grafting Surgery Ann. Thorac. Surg., March 1, 2005; 79(3): 807 - 812. [Abstract] [Full Text] [PDF]
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M. Ruel, A. Kulik, B. K. Lam, F. D. Rubens, P. J. Hendry, R. G. Masters, P. Bedard, and T. G. Mesana Long-term outcomes of valve replacement with modern prostheses in young adults Eur. J. Cardiothorac. Surg., March 1, 2005; 27(3): 425 - 433. [Abstract] [Full Text] [PDF]
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P. Boivie, C. Edstrom, and K. G. Engstrom Side differences in cerebrovascular accidents after cardiac surgery: A statistical analysis of neurologic symptoms and possible implications for anatomic mechanisms of aortic particle embolization J. Thorac. Cardiovasc. Surg., March 1, 2005; 129(3): 591 - 598. [Abstract] [Full Text] [PDF]
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S. Dogan, T. Aybek, P. S. Risteski, F. Detho, A. Rapp, G. Wimmer-Greinecker, and A. Moritz Minimally Invasive Port Access Versus Conventional Mitral Valve Surgery: Prospective Randomized Study Ann. Thorac. Surg., February 1, 2005; 79(2): 492 - 498. [Abstract] [Full Text] [PDF]
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G. Rizzoli, T. Bottio, V. Vida, G. Nesseris, L. Caprili, G. Thiene, and G. Gerosa Intermediate results of isolated mitral valve replacement with a Biocor porcine valve J. Thorac. Cardiovasc. Surg., February 1, 2005; 129(2): 322 - 329. [Abstract] [Full Text] [PDF]
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 D. Hering, C. Piper, R. Bergemann, C. Hillenbach, M. Dahm, C. Huth, and D. Horstkotte Thromboembolic and Bleeding Complications Following St. Jude Medical Valve Replacement: Results of the German Experience With Low-Intensity Anticoagulation Study Chest, January 1, 2005; 127(1): 53 - 59. [Abstract] [Full Text] [PDF]
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N. D. Desai, O. Merin, G. N. Cohen, J. Herman, S. Mobilos, J. Y. Sever, S. E. Fremes, B. S. Goldman, and G. T. Christakis Long-Term Results of Aortic Valve Replacement With the St. Jude Toronto Stentless Porcine Valve Ann. Thorac. Surg., December 1, 2004; 78(6): 2076 - 2083. [Abstract] [Full Text] [PDF]
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L. R. Souza, P. M. A. Pomerantzeff, C. M. de Almeida Brandao, L. F. Cardoso, L. R. V. Carrillo, L. F. P. Moreira, M. Grinberg, and S. A. de Oliveira Late evolution of mitral commissurotomy in patients with low echocardiographic score Eur. J. Cardiothorac. Surg., September 1, 2004; 26(3): 640 - 645. [Abstract] [Full Text] [PDF]
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M. Ruel, R. G. Masters, F. D. Rubens, P. J. Bedard, A. L. Pipe, W. G. Goldstein, P. J. Hendry, and T. G. Mesana Late incidence and determinants of stroke after aortic and mitral valve replacement Ann. Thorac. Surg., July 1, 2004; 78(1): 77 - 83. [Abstract] [Full Text] [PDF]
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T. Bottio, G. Rizzoli, G. Thiene, G. Nesseris, D. Casarotto, and G. Gerosa Hemodynamic and clinical outcomes with the Biocor valve in the aortic position: An 8-year experience J. Thorac. Cardiovasc. Surg., June 1, 2004; 127(6): 1616 - 1623. [Abstract] [Full Text] [PDF]
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N. Durrleman, M. Pellerin, D. Bouchard, Y. Hebert, R. Cartier, L. P. Perrault, A. Basmadjian, and M. Carrier Prosthetic valve thrombosis: Twenty-year experience at the Montreal Heart Institute J. Thorac. Cardiovasc. Surg., May 1, 2004; 127(5): 1388 - 1392. [Abstract] [Full Text] [PDF]
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W. Mistiaen, Ph. Van Cauwelaert, Ph. Muylaert, S. U. Sys, F. Harrisson, and H. Bortier Thromboembolic events after aortic valve replacement in elderly patients with a Carpentier-Edwards Perimount pericardial bioprosthesis J. Thorac. Cardiovasc. Surg., April 1, 2004; 127(4): 1166 - 1170. [Abstract] [Full Text] [PDF]
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M. Karck, K. Kallenbach, C. Hagl, C. Rhein, R. Leyh, and A. Haverich Aortic root surgery in Marfan syndrome: Comparison of aortic valve-sparing reimplantation versus composite grafting J. Thorac. Cardiovasc. Surg., February 1, 2004; 127(2): 391 - 398. [Abstract] [Full Text] [PDF]
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J. Bucerius, J. F. Gummert, M. A. Borger, T. Walther, N. Doll, V. Falk, D. V. Schmitt, and F. W. Mohr Predictors of delirium after cardiac surgery delirium: Effect of beating-heart (off-pump) surgery J. Thorac. Cardiovasc. Surg., January 1, 2004; 127(1): 57 - 64. [Abstract] [Full Text] [PDF]
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A. A.M. Ahmed, A. N.J. Graham, D. Lovell, and H. O. O'Kane Management of mild to moderate aortic valve disease during coronary artery bypass grafting Eur. J. Cardiothorac. Surg., October 1, 2003; 24(4): 535 - 540. [Abstract] [Full Text] [PDF]
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G. D'Ancona, J. I. S. de Ibarra, R. Baillot, P. Mathieu, D. Doyle, J. Metras, D. Desaulniers, and F. Dagenais Determinants of stroke after coronary artery bypass grafting Eur. J. Cardiothorac. Surg., October 1, 2003; 24(4): 552 - 556. [Abstract] [Full Text] [PDF]
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