03/12/2025
๐งต๐๐๐ซ๐ข๐จ๐ฉ๐๐ซ๐๐ญ๐ข๐ฏ๐ ๐๐ง๐ญ๐ข๐๐จ๐๐ ๐ฎ๐ฅ๐๐ญ๐ข๐จ๐ง
This is one of the hardest decisions in medicine.
Stopping too early increases clots.
Stopping too late increases bleeding.
This post simplifies everything.
1๏ธโฃ ๐๐ญ๐๐ซ๐ญ ๐ฐ๐ข๐ญ๐ก ๐ญ๐ก๐ ๐๐ฎ๐ง๐๐๐ฆ๐๐ง๐ญ๐๐ฅ ๐ช๐ฎ๐๐ฌ๐ญ๐ข๐จ๐ง
Perioperative AC is about preventing two dangers
โข Surgical bleeding
โข Thrombosis when AC is stopped
Every patient needs BOTH risks assessed before making any move.
2๏ธโฃ ๐๐ญ๐๐ฉ ๐. ๐๐ฅ๐๐ฌ๐ฌ๐ข๐๐ฒ ๐ญ๐ก๐ ๐ฉ๐ซ๐จ๐๐๐๐ฎ๐ซ๐ ๐๐ฅ๐๐๐๐ข๐ง๐ ๐ซ๐ข๐ฌ๐ค ๐ฉธ
Three levels guide the entire plan
โข Minimal
โข Low to moderate
โข High
This determines whether AC is continued, temporarily held, or fully reversed.
3๏ธโฃ ๐๐ข๐ง๐ข๐ฆ๐๐ฅ ๐๐ฅ๐๐๐๐ข๐ง๐ ๐ซ๐ข๐ฌ๐ค (๐๐ ๐ฎ๐ฌ๐ฎ๐๐ฅ๐ฅ๐ฒ ๐๐จ๐ง๐ญ๐ข๐ง๐ฎ๐๐)
Examples
โข Dental procedures
โข Minor dermatology
โข Pacemaker implantation
โข Cataract surgery
โข Arthrocentesis
โข Diagnostic endoscopy
These have extremely low procedure-related bleeding even if AC is continued.
4๏ธโฃ ๐๐จ๐ฐ ๐ญ๐จ ๐ฆ๐จ๐๐๐ซ๐๐ญ๐ ๐๐ฅ๐๐๐๐ข๐ง๐ ๐ซ๐ข๐ฌ๐ค (๐๐ ๐ฎ๐ฌ๐ฎ๐๐ฅ๐ฅ๐ฒ ๐ข๐ง๐ญ๐๐ซ๐ซ๐ฎ๐ฉ๐ญ๐๐)
Common examples
โข Laparoscopic cholecystectomy
โข Hernia repair
โข Most abdominal and thoracic surgeries
โข Coronary angiography
These procedures typically need short DOAC hold or warfarin interruption.
5๏ธโฃ ๐๐ข๐ ๐ก ๐๐ฅ๐๐๐๐ข๐ง๐ ๐ซ๐ข๐ฌ๐ค ๐ฉ๐ซ๐จ๐๐๐๐ฎ๐ซ๐๐ฌ (๐ฌ๐ญ๐ซ๐ข๐๐ญ ๐๐ ๐๐จ๐ง๐ญ๐ซ๐จ๐ฅ ๐ง๐๐๐๐๐)
Examples
โข Neurosurgery
โข Major vascular surgeries
โข Major cancer surgeries
โข Total hip or knee replacement
โข Surgeries with neuraxial anesthesia
These require near-complete anticoagulant clearance and controlled restart.
6๏ธโฃ ๐๐ญ๐๐ฉ ๐. ๐๐ฌ๐ฌ๐๐ฌ๐ฌ ๐ญ๐ก๐ซ๐จ๐ฆ๐๐จ๐ฌ๐ข๐ฌ ๐ซ๐ข๐ฌ๐ค ๐ง
You must stratify thrombosis risk from
โข Mechanical valves
โข Atrial fibrillation
โข VTE
This step decides whether interruption is safe and whether bridging is required.
7๏ธโฃ ๐๐๐๐ก๐๐ง๐ข๐๐๐ฅ ๐ฏ๐๐ฅ๐ฏ๐ ๐ฉ๐๐ญ๐ข๐๐ง๐ญ๐ฌ = ๐ก๐ข๐ ๐ก๐๐ฌ๐ญ ๐ซ๐ข๐ฌ๐ค ๐ ๐ซ๐จ๐ฎ๐ฉ
High-risk features
โข Mitral mechanical valve
โข Caged-ball or tilting-disk valves
โข Valve placed โค months
โข Prior stroke
โข AF or LV dysfunction
Mitral mechanical valves have up to 22 percent annual stroke risk without AC.
8๏ธโฃ ๐๐ญ๐ซ๐ข๐๐ฅ ๐๐ข๐๐ซ๐ข๐ฅ๐ฅ๐๐ญ๐ข๐จ๐ง ๐ญ๐ก๐ซ๐จ๐ฆ๐๐จ๐ฌ๐ข๐ฌ ๐ซ๐ข๐ฌ๐ค (๐๐๐๐๐๐๐-๐๐๐๐)
Risk levels
โข 0 to 3 โ low
โข 4 to 6 โ moderate
โข โฅ7 or recent stroke โ high
BRIDGE trial: low and moderate AF patients bleed more if bridged without any reduction in stroke.
9๏ธโฃ ๐๐๐ ๐ญ๐ก๐ซ๐จ๐ฆ๐๐จ๐ฌ๐ข๐ฌ ๐ซ๐ข๐ฌ๐ค ๐๐๐ฉ๐๐ง๐๐ฌ ๐ฆ๐๐ข๐ง๐ฅ๐ฒ ๐จ๐ง ๐ญ๐ข๐ฆ๐ข๐ง๐
โข VTE โค months โ high risk
โข VTE 3 to 12 months โ moderate
โข VTE >12 months โ low
Strong thrombophilias (APS, protein C/S, AT deficiency) push the patient into high-risk category irrespective of timing.
๐ ๐๐ญ๐๐ฉ ๐. ๐๐๐๐ข๐๐ ๐ข๐ ๐๐ ๐ฆ๐ฎ๐ฌ๐ญ ๐๐ ๐ข๐ง๐ญ๐๐ซ๐ซ๐ฎ๐ฉ๐ญ๐๐
Simple rule
โข Minimal bleeding risk โ continue AC
โข Low/moderate โ interrupt safely
โข High bleeding risk โ interrupt and ensure INR normalization or full DOAC washout before incision
This step prevents intraoperative bleeding catastrophes.
1๏ธโฃ1๏ธโฃ ๐๐ญ๐๐ฉ ๐. ๐๐ซ๐ข๐๐ ๐ข๐ง๐ ๐๐๐๐ข๐ฌ๐ข๐จ๐ง๐ฌ (๐๐จ๐ซ ๐ฐ๐๐ซ๐๐๐ซ๐ข๐ง ๐จ๐ง๐ฅ๐ฒ) ๐งฉ
Bridging = giving LMWH or UFH during warfarin interruption.
Modern evidence: bridging should be used only in very high thrombosis risk patients because it increases bleeding without reducing thrombosis in most others.
(PERIOP2 + BRIDGE trials)
1๏ธโฃ2๏ธโฃ ๐๐ก๐จ ๐ญ๐ซ๐ฎ๐ฅ๐ฒ ๐ง๐๐๐๐ฌ ๐๐ซ๐ข๐๐ ๐ข๐ง๐ (๐ซ๐๐ซ๐ ๐๐ฎ๐ญ ๐๐ซ๐ฎ๐๐ข๐๐ฅ)
Use bridging only when stopping AC is extremely unsafe:
โข Mechanical mitral valve
โข Caged-ball or tilting-disk valve
โข CHA2DS2-VASc โฅ7
โข Recent stroke or TIA
โข VTE โค months
โข APS or multiple thrombophilias
These are the ONLY groups where bridging has a favorable riskโbenefit ratio.
1๏ธโฃ3๏ธโฃ ๐๐๐ซ๐๐๐ซ๐ข๐ง ๐ฉ๐๐ซ๐ข๐จ๐ฉ๐๐ซ๐๐ญ๐ข๐ฏ๐ ๐ฉ๐ฅ๐๐ง (๐๐ฅ๐๐๐ซ ๐๐ง๐ ๐๐๐ญ๐๐ข๐ฅ๐๐) ๐ก
Stopping
โข Stop 5 days before surgery
โข Check INR 7โ10 days before, then again night before
โข If INR >1.5 โ give 1.25โ2.5 mg vitamin K
Restarting
โข Low/mod risk โ restart 12 hours post-op
โข High bleed risk โ restart 24โ36 hours post-op
Bridging ONLY if patient is very high thrombosis risk.
1๏ธโฃ4๏ธโฃ ๐๐ซ๐ข๐๐ ๐ข๐ง๐ ๐ฉ๐ซ๐จ๐ญ๐จ๐๐จ๐ฅ (๐ข๐ ๐ข๐ง๐๐ข๐๐๐ญ๐๐)
โข Start LMWH 36 hours after last warfarin dose
โข Last LMWH dose 24 hours before procedure
โข If CrCl