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Left heart catheterization is an invasive diagnostic procedure used to evaluate the function and structure of the left side of the heart. It is generally performed to diagnose and treat cardiovascular conditions such as valve abnormalities, coronary artery disease, and congenital heart defects.Diagnostic and therapeutic purposesLeft heart catheterization serves various diagnostic and therapeutic purposes, including:Assessing coronary artery bypass grafts.Evaluating coronary artery disease in...
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Cardiac catheterization is an invasive diagnostic technique used to identify and evaluate structural and functional diseases of the heart and major blood vessels. This technique diagnoses congenital heart disease, coronary artery disease, valvular heart disease, and coronary spasms and assesses ventricular function. It helps guide treatment decisions, including the need for revascularization procedures like percutaneous coronary intervention (PCI) or coronary artery bypass grafting (CABG) and...
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Venous thrombosis requires effective prevention and treatment strategies to improve patient outcomes and reduce potential complications.Prevention StrategiesHealthcare providers must prioritize preventing venous thromboembolism (VTE) for all adult patients upon admission. Interventions depend on bleeding and thrombosis risk, medical history, current medications, diagnoses, planned procedures, and patient preferences. Patients on bed rest should change positions every two hours and, if not...
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Related Experiment Video

Updated: Nov 20, 2025

Robotic Ablation of Atrial Fibrillation
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Protocol driven periprocedural anticoagulation for left atrial ablation.

Christopher J Bradley1, Brian D Williamson1, Julie George1

  • 1Department of Cardiovascular Medicine, Oakland University William Beaumont School of Medicine, Royal Oak, Michigan, USA.

Journal of Cardiovascular Electrophysiology
|January 21, 2021
PubMed
Summary
This summary is machine-generated.

A new weight-based heparin dosing protocol improved therapeutic activated clotting time (ACT) levels during left atrial ablation procedures. This protocol specifically benefited patients on direct oral anticoagulants (DOACs), reducing time to therapeutic ACT.

Keywords:
anticoagulationatrial fibrillationcatheter ablationquality improvement

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Area of Science:

  • Cardiology
  • Pharmacology

Background:

  • Subtherapeutic heparin dosing can occur during left atrial catheter ablation.
  • Optimizing heparin dosing is crucial for procedural safety and efficacy.

Purpose of the Study:

  • To evaluate a weight-based heparin dosing protocol adjusted for oral anticoagulation.
  • To determine if the protocol increases therapeutic activated clotting time (ACT) and reduces time to therapeutic ACT during left atrial ablation.

Main Methods:

  • A departmental protocol for intravenous unfractionated heparin (UFH) dosing was implemented, targeting ACT >300 seconds.
  • Initial UFH bolus doses were adjusted based on weight and pre-procedure oral anticoagulation status (warfarin, none, or direct oral anticoagulants [DOACs]).
  • One hundred procedures using the protocol were compared to a retrospective cohort using usual care.

Main Results:

  • The protocol significantly increased the initial UFH bolus dose for patients on DOACs (99.3 to 118.2 units/kg).
  • The proportion of patients achieving therapeutic ACT on the first draw increased from 57.7% to 76.6% for those on DOACs.
  • The time to achieve therapeutic ACT decreased from 37.8 to 30.2 minutes for patients on DOACs.

Conclusions:

  • A weight-based heparin dosing protocol improves periprocedural anticoagulation management.
  • The protocol leads to a higher proportion of therapeutic ACT values and reduced time to therapeutic ACT, particularly for patients on DOACs.