Cardiac Cath Lab Equipment: The Essential Tools

From the first needle stick to the final closure device, the cath lab runs on a well-defined toolkit. Here's what each piece of equipment does and where it fits in a case.

Vascular access: needles and sheaths

A case begins with vascular access — a needle punctures the artery (radial or femoral), a guidewire is threaded in, and an introducer sheath is placed over it. The sheath is a valved tube that keeps the access site open, controls bleeding, and lets catheters be exchanged smoothly.

Guidewires

Guidewires provide the rail that everything else tracks over:

Wire	Typical use
0.035 inch	Diagnostic and peripheral work
0.014 inch	Coronary interventions (the PCI workhorse)

Diagnostic and guide catheters

Diagnostic catheters — such as Judkins left and right and the pigtail (for ventriculography) — are shaped to engage specific vessels and record pressures. Guide catheters have a larger lumen and stiffer body to deliver balloons and stents during PCI.

Manifold and pressure monitoring

The manifold is a set of stopcocks connecting contrast, flush, and pressure monitoring through one system. Fluid-filled tubing and a transducer convert the catheter-tip pressure into the tracings you read on screen — the basis of all invasive hemodynamics.

Intravascular imaging and physiology

• IVUS (intravascular ultrasound) — ultrasound images of the vessel wall and lumen; sizes stents and assesses plaque.
• OCT (optical coherence tomography) — near-infrared light for very high-resolution vessel imaging.
• FFR / iFR — a pressure wire measures the physiological significance of a stenosis (see the hemodynamics guide).

Support and closure devices

Complex cases add mechanical support such as the intra-aortic balloon pump or a percutaneous ventricular assist device. At the end of a case, vascular closure devices or manual pressure achieve haemostasis at the access site.

Key takeaways

• Access uses a needle, guidewire, and an introducer sheath.
• 0.035-inch wires are diagnostic; 0.014-inch wires drive PCI.
• Diagnostic catheters record pressures; guide catheters deliver devices.
• The manifold and transducer power invasive hemodynamics.
• IVUS, OCT, and FFR add imaging and physiology; the IABP adds support.

Frequently asked questions

What equipment is used in the cardiac cath lab?

Vascular access needles and introducer sheaths, guidewires, diagnostic and guide catheters, a manifold and pressure transducer, intravascular imaging (IVUS, OCT), FFR pressure wires, support devices like the intra-aortic balloon pump, and vascular closure devices.

What is an introducer sheath?

A valved tube placed in the artery that keeps the access site open, controls bleeding, and lets catheters be exchanged over a guidewire.

What is the difference between a diagnostic and a guide catheter?

Diagnostic catheters engage vessels and record pressures; guide catheters have a larger lumen and stiffer body to deliver balloons and stents during PCI.

What guidewire size is used for coronary work?

A 0.014-inch guidewire is the coronary workhorse; 0.035-inch wires are used for diagnostic and peripheral work.

What is IVUS used for?

Intravascular ultrasound images the vessel wall and lumen from inside the artery, helping size stents and assess plaque and stent expansion.

What does the manifold do?

It connects contrast, flush, and pressure monitoring through one system of stopcocks for controlled injection and hemodynamic recording.