What is the recommended anesthesia management for transcarotid artery revascularization (TCAR)?

Anesthesia Management for TCAR

Both regional/local anesthesia (RA/LA) and general anesthesia (GA) are acceptable for transcarotid artery revascularization (TCAR), with regional anesthesia increasingly preferred due to shorter hospital stays, reduced need for ICU monitoring, and the ability to perform immediate neurological assessment.

Anesthesia Selection

Regional/Local Anesthesia (Preferred When Feasible)

• RA/LA can be safely used in the majority of TCAR cases 1, 2
• Observational data shows 84% of TCAR procedures successfully performed under RA with zero conversions to GA intraoperatively 1
• National registry data (2016-2018) demonstrates comparable outcomes between RA (17.7% of cases) and GA (82.3%), with no significant difference in the composite endpoint of stroke, MI, and mortality (2.6% vs 2.3%, p=0.808) 2

Advantages of RA/LA:

• Immediate neurological monitoring during flow reversal
• Shorter hospital length of stay (1.4 days vs 4.2 days with GA) 1
• Reduced need for ICU admission (only 8% required ICU with standardized protocols) 1
• 93% reduction in 30-day mortality odds compared to GA 3
• Lower pulmonary complications (OR 0.19) 3
• Shorter case duration (88 vs 106 minutes) 3

General Anesthesia Indications

GA should be used when:

• Transesophageal echocardiography guidance required during deployment
• Borderline vascular access necessitating complex manipulation
• Cognitive or language barriers preventing patient cooperation
• Inability to remain still or lie flat
• Chronic pain syndromes
• Morbid obesity
• Patient anxiety or preference 4

Intraoperative Hemodynamic Management

Blood Pressure Control

Critical principle: Maintain cerebral perfusion during flow reversal

• Target systolic BP: 140-160 mmHg (or patient's baseline) during carotid clamping/flow reversal 5
• Administer glycopyrrolate 0.2-0.4 mg to maintain heart rate ~70 bpm and prevent bradycardia during carotid manipulation 5
• Use phenylephrine infusion in 95% of cases to maintain BP targets during flow reversal 5
• Avoid prolonged hypotension—maintain mean arterial pressure >75 mmHg to prevent the cascade of subendocardial ischemia and hemodynamic collapse 6

Monitoring Requirements

Standard monitoring includes:

• ASA standard monitors
• Invasive arterial blood pressure monitoring (essential)
• Cerebral oximetry/near-infrared spectroscopy (bilateral)
• Continuous ECG monitoring 5

Note: Unlike traditional TAVR procedures, TCAR does not routinely require pulmonary artery catheters or central venous access 4

Perioperative Medication Management

Antiplatelet Therapy

• Dual antiplatelet therapy (DAPT) with aspirin 81-325 mg + clopidogrel 75 mg is mandatory before and for minimum 30 days after TCAR 7, 8
• Continue aspirin indefinitely postoperatively 7
• For clopidogrel intolerance, substitute ticlopidine 250 mg twice daily 7

Anticoagulation

• Administer heparin after sheath insertion to maintain ACT >300 seconds 6
• Protamine reversal may not be necessary for transfemoral access if minimal bleeding risk 6

Postoperative Care Protocols

Recovery Location

Most patients do NOT require ICU admission 1

Standardized pathway:

1. Post-anesthesia care unit (PACU) for 2-4 hours
2. Transfer to step-down unit or floor (if hemodynamically stable)
3. ICU reserved only for:
   • Severe preoperative neurological symptoms
   • Postoperative neurological events
   • Hemodynamic instability requiring IV vasoactive medications
   • Respiratory complications 1

Immediate Postoperative Management

For GA patients:

• Early extubation in the procedure room when feasible 4
• Fast-track extubation protocols 4

Blood pressure management:

• 52.5% require antihypertensives (hydralazine 10-20 mg or labetalol 10-20 mg) during emergence to prevent hypertensive complications 5
• Postoperative hypertension increases risk of stroke, TIA, wound bleeding, and intracranial hemorrhage 8

Neurological assessment:

• Document clinical neurological examination within 24 hours before and after procedure 7
• With RA/LA, immediate assessment possible; with GA, assess upon emergence

Expected Outcomes

• Mean hospital stay: 1.5 days with enhanced recovery protocols 1, 9
• Perioperative stroke/death rate: 1.9-2.4% 1, 9
• Mean blood loss: 74 mL (transfusion rarely needed) 5

Common Pitfalls to Avoid

1. Hypotension during flow reversal: This is the most dangerous complication—can trigger subendocardial ischemia and ventricular fibrillation. Preemptive vasopressor therapy is essential 6

2. Inadequate patient selection for RA/LA: Don't attempt RA/LA in patients who cannot cooperate or remain still—conversion to GA intraoperatively is problematic

3. Routine ICU admission: Unnecessary in 90%+ of cases with proper protocols, wastes resources and increases costs 1

4. Delayed extubation with GA: Early extubation allows immediate neurological assessment—critical for detecting complications 4

5. Inadequate DAPT: Failure to maintain dual antiplatelet therapy for 30 days increases thrombotic complications 7, 8