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Related Concept Videos

Clinical Trials01:16

Clinical Trials

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.
There are four phases in a clinical trial. A phase one...
Clinical Trials: Overview01:11

Clinical Trials: Overview

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...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
Drug Product Performance: In Vitro–In Vivo Correlation01:20

Drug Product Performance: In Vitro–In Vivo Correlation

In pharmaceutical development, it's crucial to establish a predictive in vitro–in vivo correlation (IVIVC) for two or more formulations to gain a comprehensive understanding of release properties. IVIVC reduces the need for costly in vivo studies and facilitates the establishment of meaningful dissolution specifications with significant cost savings and decreased regulatory burden. Furthermore, a meaningful IVIVC should predict Cmax and AUC within 20%, aligning with FDA guidance while adhering...

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Long-Term Results of the RAPCO Trials.

Brian F Buxton1,2, Philip A Hayward2, Jai Raman1,2

  • 1Department of Cardiac Surgery, Austin Hospital, Melbourne, Australia (B.F.B., J.R., S.C.M., S.S., G.M.).

Circulation
|October 5, 2020
PubMed
Summary
This summary is machine-generated.

The radial artery (RA) shows superior long-term patency compared to the right internal thoracic artery (RITA) and saphenous vein (SV) grafts in coronary bypass surgery. This improved patency may also correlate with better patient survival rates.

Keywords:
coronary artery bypassradial arterysaphenous vein

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Area of Science:

  • Cardiovascular Surgery
  • Vascular Grafting
  • Clinical Trials

Background:

  • Coronary artery bypass grafting (CABG) commonly uses internal thoracic artery grafts.
  • Optimal selection of a second conduit for CABG remains a subject of debate.
  • The Radial Artery Patency and Clinical Outcomes (RAPCO) trials were initiated to address this controversy.

Purpose of the Study:

  • To compare the long-term graft patency of the radial artery (RA) versus the right internal thoracic artery (RITA).
  • To compare the long-term graft patency of the radial artery (RA) versus the saphenous vein (SV).

Main Methods:

  • RAPCO-RITA: 394 patients randomized to RA or free RITA graft.
  • RAPCO-SV: 225 patients randomized to RA or SV graft.
  • Primary outcome: 10-year graft failure; secondary outcome: 10-year patient survival.

Main Results:

  • 10-year RA patency (89%) was significantly higher than free RITA (80%) and SV (71%).
  • RA demonstrated a lower risk of graft failure compared to RITA (HR 0.45) and SV (HR 0.40).
  • 10-year patient survival was higher in the RA group compared to RITA (90.9% vs 83.7%) and SV (72.6% vs 65.2%).

Conclusions:

  • The radial artery offers significantly higher 10-year patency rates than both free RITA and SV grafts.
  • These findings support the use of the radial artery as a favorable second conduit in CABG.
  • Improved graft patency with RA may translate to enhanced long-term patient survival.