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Related Concept Videos

Observational Studies01:11

Observational Studies

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Observational studies are a type of analytical study where researchers observe events without any interventions. In other words, the researcher does not influence the response variable or the experiment's outcome.
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Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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Regression toward the mean (“RTM”) is a phenomenon in which extremely high or low values—for example, and individual’s blood pressure at a particular moment—appear closer to a group’s average upon remeasuring. Although this statistical peculiarity is the result of random error and chance, it has been problematic across various medical, scientific, financial and psychological applications. In particular, RTM, if not taken into account, can interfere when...
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Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
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Related Experiment Video

Updated: Oct 8, 2025

A Rodent Model of The Ross Operation: Syngeneic Pulmonary Artery Graft Implantation in A Systemic Position
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State-of-the-art: Insights from the Ross Registry.

Buntaro Fujita1,2, Anas Aboud1,2, Hans-Hinrich Sievers1

  • 1Department of Cardiac and Thoracic Vascular Surgery, University Heart Center Lübeck, University Hospital of Schleswig Holstein, Lübeck, Germany.

JTCVS Techniques
|January 3, 2022
PubMed
Summary

The Ross procedure offers excellent mid-term survival for young patients with aortic valve disease, showing lower reintervention and morbidity rates compared to other treatments. This registry data supports its long-term efficacy.

Keywords:
Ross procedureSAVRaortic regurgitationaortic stenosispulmonary autograftyoung patients

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Area of Science:

  • Cardiovascular Surgery
  • Thoracic Surgery
  • Valvular Heart Disease

Background:

  • Aortic valve disease in young patients necessitates durable solutions with long-term outcomes exceeding 20-30 years.
  • The Ross procedure, using an autologous pulmonary valve, aims for superior durability and avoids anticoagulation.
  • Limited randomized data exists, highlighting the importance of observational studies and registries.

Discussion:

  • The multicenter Ross Registry, founded in 2001, has collected data on over 2500 patients, with follow-up extending beyond 25 years.
  • Analyses focus on patient demographics, surgical techniques, risk factors, and survival outcomes.
  • Registry data is crucial for monitoring outcomes and reflecting current practice quality in the absence of randomized trials.

Key Insights:

  • The Ross procedure demonstrates excellent mid-term survival (25 years) in adult patients (mean age 44.1 years).
  • Reintervention rates are lower than with xenografts.
  • Anticoagulation-related morbidity is lower than with mechanical valves.

Outlook:

  • Continued data collection and analysis from the Ross Registry will further elucidate long-term outcomes.
  • The registry serves as a vital resource for understanding the treatment of aortic valve disease in young populations.
  • Further research may focus on refining surgical techniques and patient selection for the Ross procedure.