14.1 Interventional Suite & Hybrid OR

Interventional Suite & Hybrid OR

ARRT Cardiac-Interventional Procedures Focus of Questions 10 is Interventional Suite and Hybrid OR. This is not floor-plan trivia. The exam asks whether the room you staffed can do what the case is about to need: two simultaneous cine planes, an implant-grade sterile field, a balloon-pump console that stays powered, or a sternotomy without rolling a crashing patient down the hall.

Quick Answer: A single-plane suite is the everyday PCI room. Biplane is for congenital, complex structural, and many electrophysiology (EP) cases — two tubes, two orthogonal planes at once, a dose tradeoff. A hybrid operating room (OR) adds surgical lights, an anesthesia boom, and cardiopulmonary bypass (CPB) so the team can convert to sternotomy without moving the patient. That is why transcatheter aortic valve replacement (TAVR), lead extraction, high-risk PCI, and ventricular septal defect (VSD) work live there. Implants need OR-grade air and tight traffic. Alcohol prep plus electrosurgery is a fire.

Single-plane versus biplane

Single-plane imaging is one C-arm and one detector. Adult diagnostic catheterization and most PCI run here. You rotate the gantry for right and left anterior oblique and for cranial or caudal angulation; you do not acquire two planes at the same instant.

Biplane is two C-arms — often a frontal plane plus a lateral or caudal plane — that can cine together. The clinical win is two orthogonal views in one contrast injection: fewer sequential runs, less contrast, shorter wire time in small children and in complex congenital connections, and simultaneous dual-plane imaging during some EP and structural cases.

Dose tradeoff (exam trap). Two tubes can raise instantaneous dose because both beams may be on. Total case dose and contrast may fall if you avoid a stack of single-plane cine runs. Biplane is not “always lower dose” and not “always higher dose.” It is chosen when simultaneous two-plane anatomy matters. Do not staff a congenital or complex EP list in a single-plane room and then wonder why the operator is repeating every injection.

Boom-mounted C-arms, control room, lead glass, radiation shields

Modern suites hang the C-arm from ceiling or floor booms so the floor stays open for anesthesia, mechanical-support consoles, and emergency access. A portable C-arm is not a substitute for a fixed interventional system.

The control room sits behind lead glass. Physiologic waveforms, last-image-hold, injector remote, and the intercom live there. Someone competent must still be in the procedure room with the patient; the glass is shielding, not a place to hide the crash cart.

Radiation shields that belong to the suite (Image Production ALARA is a separate chapter): ceiling-suspended lead-acrylic shields, table-side lead flaps, and a place to hang aprons so they are not folded. Park the shield between the scatter source and the operator’s thorax before cine, not after the run.

Power, UPS, and the consoles that must not go dark

Map dedicated outlets and uninterruptible power supply (UPS) coverage before the patient is draped. Imaging, physiologic monitors, the power injector, intra-aortic balloon pump (IABP) and Impella consoles, and intracardiac echocardiography (ICE) / intravascular ultrasound (IVUS) consoles should not share a random extension cord. If the room blinks, the balloon pump should not.

Have the crash cart, defibrillator, and airway equipment (bag-valve mask, suction, oral airways, intubation tray) unobstructed. Boom-mounted monitors that block the cart are a setup failure, not a “we will move it if we code.”

The injector and ICE/IVUS carts need a home that does not block the sterile field, the anesthesia boom, or the path to the head of the table.

Air, sterility, and traffic: table suite versus implant

A diagnostic angiogram can run in a well-run interventional suite. An implant — pacemaker, implantable cardioverter-defibrillator (ICD), TAVR valve, occluder — is an OR-grade event. Laminar / high-efficiency particulate air (HEPA), high air-change ventilation, and restricted traffic exist to drop particles on hardware that will stay in the body. Extra door openings, extra people, and street-clothes traffic are not help.

Traffic flow: unrestricted (waiting), semi-restricted (scrubs, hair cover), restricted (mask, sterile field). For implants, treat every extra body as a contamination source. The circulating role includes who is allowed in and when the door stays shut. Sterile standards are tighter for implants than for a diagnostic catheter.

Time-out (Universal Protocol): identity, procedure, site and laterality, consent, allergies, implants and equipment on the table, blood availability, antibiotics if ordered, and fire risk. A familiar operator does not skip it.

Fire: alcohol prep plus electrosurgery

The surgical fire triad is an oxidizer (oxygen, nitrous oxide), a fuel (alcohol-based prep, drapes, hair), and an ignition source (electrosurgery / Bovie, laser, hot fiberoptic cable). Hybrid and implant cases use all three. Alcohol prep must dry for the manufacturer’s time before a spark. Open oxygen under the drape is not a free pass. This is why fire risk is on the time-out, and why a wet, shiny prep field does not get a Bovie to save two minutes.

Hybrid OR: what it adds and why the exam cares

A hybrid OR is a surgical operating room with a fixed interventional imaging system. Extra pieces the table suite usually lacks:

• Surgical-grade lights
• An anesthesia boom and a full anesthesia machine and ventilator as the default, not a maybe
• CPB (heart-lung machine) capability and a perfusion path to the table
• Space and instruments to convert to sternotomy without moving the patient
• Implant-level air and traffic

Cases that belong here when conversion is a real plan:

• TAVR / TAVI — vascular injury, annular rupture, coronary obstruction, or need for surgical aortic valve replacement
• Lead extraction — a superior vena cava tear is a minutes-not-hallway problem
• High-risk PCI — unprotected left main, last remaining vessel, already on mechanical support, surgical backup in the room
• VSD (post-infarct or selected congenital) — residual shunt, device embolization, or need for patch repair

Do not treat hybrid as “the fancy cath lab.” It is the room that can open the chest where the patient already is.

Table: suite versus hybrid — what you can do

Scenario and traps

A 4-year-old with tetralogy anatomy needs simultaneous frontal and lateral ventricular injections. That is a biplane case, not “swing the gantry twice and accept the extra contrast.” A 78-year-old for high-risk TAVR with a hostile annulus is a hybrid OR case because annular rupture is treated with the chest already in a surgical field, not with a hallway transfer. An ICD generator change is an implant: OR-grade air, fewer door swings, dry prep before any electrosurgery.

Traps: calling every biplane room a hybrid. Calling every hybrid a lower-dose room. Skipping the time-out because the team knows the patient. Plugging the Impella console into an extension that is not on UPS. Wet alcohol and a Bovie. Staffing lead extraction in a table suite with no CPB path “because the extraction is percutaneous.”