# Off-Pump Coronary Artery Bypass (OPCAB)

> Citation bundle for Off-Pump Coronary Artery Bypass (OPCAB) on The Treatment Registry.
> URL: https://thetreatmentregistry.com/procedures/cabg-off-pump
> Bundle URL: https://thetreatmentregistry.com/api/citations/procedures/cabg-off-pump

- Category: cardiology
- Average recovery: 56 days
- Typical sessions: 1
- Price range (USD international): $22,000–$70,000

## Description

Off-pump coronary artery bypass (OPCAB) is a CABG technique performed on a beating heart without cardiopulmonary bypass. The surgeon uses tissue stabilisers to immobilise the small area of the coronary artery being grafted while the rest of the heart continues to beat. OPCAB avoids the systemic inflammatory response and other physiological consequences of cardiopulmonary bypass, but is technically more demanding than on-pump CABG and may produce slightly fewer complete revascularisations in some hands. ACC/AHA guidelines recommend OPCAB as a reasonable alternative to on-pump CABG in selected patients, particularly those with calcified ascending aortas where aortic cannulation is high-risk.

## Overview

Off-pump coronary artery bypass (OPCAB) is a form of coronary artery bypass surgery (CABG) used to treat coronary artery disease, the build-up of atheromatous plaque that narrows the arteries supplying the heart. The operation bypasses these narrowed segments using arteries or veins harvested from elsewhere in the body, restoring blood flow to previously ischaemic heart muscle; CABG can relieve the chest pain of angina, slow the progression of the disease and improve life expectancy. There are two main approaches to constructing the grafts. In the conventional on-pump technique, a cardiopulmonary bypass machine operated by a perfusionist takes over the work of the heart and lungs while the heart is stopped in cardioplegic arrest, and the surgeon then joins the grafts across the diseased segments. In the off-pump approach that defines OPCAB, these connections, known as anastomoses, are instead constructed while the heart continues to beat, avoiding the bypass machine. The most important graft is usually the left internal mammary (internal thoracic) artery joined to the left anterior descending artery, which supplies the largest share of heart muscle; other commonly used conduits include the right internal mammary artery, the radial artery and the great saphenous vein. The selection of which vessels to bypass follows review of the patient's coronary angiogram, with the aim of addressing all the significant lesions.

## Peer-reviewed outcome rates

- **Complication rate:** 8.00% (range 5.00–13.00%) — from 1 cited source
- **Revision rate:** 5.00% (range 3.00–10.00%) — from 2 cited sources
- **Mortality rate:** 1.50% (range 0.50–3.00%) — from 2 cited sources

## Common risks

- Incomplete revascularisation
- Conversion to on-pump CABG
- Atrial fibrillation
- Stroke
- Sternal wound infection
- Atelectasis

## FAQs

### Is off-pump CABG safer than on-pump?

In experienced hands, mortality is comparable. OPCAB has short-term advantages (lower transfusion, possibly lower stroke rate, faster extubation) and the trade-off of slightly lower graft patency in some series and the surgical demand. ACC/AHA guidelines recommend OPCAB as reasonable in selected patients (Class IIa).

### When is off-pump CABG specifically recommended?

Patients with severely calcified ascending aortas (where aortic cannulation for on-pump bypass is high-risk) are the strongest candidates. Patients with significant comorbidity (renal dysfunction, advanced age, severe lung disease) may also benefit from avoiding cardiopulmonary bypass.

### How experienced does my surgeon need to be?

OPCAB has a meaningful learning curve. Surgeons with high OPCAB volumes (>50 cases per year) achieve outcomes comparable to on-pump CABG. Low-volume operators may have worse outcomes — both for completion of revascularisation and for major adverse events.

### What if the surgeon needs to convert to on-pump intra-operatively?

Conversion to on-pump CABG happens in 5-15% of OPCAB cases depending on patient anatomy and surgeon experience. Pre-operative consent should always cover the possibility of conversion. Outcomes after conversion are similar to planned on-pump CABG.

### Can I have OPCAB if I have multiple-vessel disease?

Yes — modern OPCAB technique allows multi-vessel revascularisation in most patients. The decision is based on coronary anatomy, target vessel quality, and surgeon experience. Some patterns (deep posterior targets, marginal target vessels) are technically more demanding off-pump.

### How long is the in-hospital stay?

Total length of stay is typically 5-7 days, similar to on-pump CABG. Extubation may be faster (4-6 hours vs 8-12 hours on-pump) and ICU stay slightly shorter, but step-down and ward time are comparable.

### Can off-pump CABG be combined with valve surgery?

Combining off-pump CABG with valve replacement is technically possible but reduces the off-pump advantage substantially, because valve surgery typically requires cardiopulmonary bypass anyway. Most surgeons performing combined coronary-valve operations use on-pump CABG to maintain a consistent operative environment.

### Is recovery shorter after off-pump CABG?

Extubation typically happens earlier (4-6 hours vs 8-12 hours on-pump) and ICU stay is slightly shorter, but total hospital length-of-stay is broadly similar — 5-7 days for most patients. The longer-term recovery trajectory (return to sedentary work, cardiac rehabilitation milestones) is comparable between on-pump and off-pump CABG.

## Sources

- [STS Adult Cardiac Surgery Database](https://www.sts.org/registries/sts-national-database/adult-cardiac-surgery-database) — Society of Thoracic Surgeons (accessed 2026-05-09)
- [2021 ACC/AHA/SCAI Guideline for Coronary Artery Revascularization](https://www.ahajournals.org/doi/10.1161/CIR.0000000000001038) — American College of Cardiology / American Heart Association (accessed 2026-05-09)