Cardiologist's Toolkit: Diagnostic and Therapeutic Technologies

Cardiologists employ a vast array of tools spanning physical examination, non-invasive imaging, invasive hemodynamics, implantable devices, and surgical instrumentation.

Physical Examination & Basic Tools

• Stethoscope: Auscultation of heart sounds, murmurs, rubs, lung fields.
• Blood Pressure Cuff: Manual (auscultatory) or automated; central aortic pressure via applanation tonometry.

Electrical Activity Assessment

• 12-Lead ECG: Resting electrical snapshot; ischemia, arrhythmia, hypertrophy, conduction delays.
• Holter Monitor: 24–48 hr continuous ECG; arrhythmia burden, symptom correlation.
• Event Monitor / Loop Recorder: Weeks to months; patient-activated or auto-detect.
• Implantable Loop Recorder (ILR): 3+ years; unexplained syncope, AF monitoring.

Structural & Functional Imaging

• Transthoracic Echocardiogram (TTE): First-line for structure/function; valves, chambers, EF, hemodynamics.
• Transesophageal Echo (TEE): Higher resolution; LA appendage, vegetations, intraoperative.
• Stress Echo: Ischemia detection via wall motion; exercise or dobutamine.
• Cardiac MRI: Tissue characterization (fibrosis, edema, infiltration), congenital, masses.
• Cardiac CT / CTA: Coronary anatomy (CAC scoring, CTA), TAVR planning, bypass grafts.
• Nuclear Imaging (SPECT/PET): Perfusion, viability, inflammation (sarcoid), amyloid.

Invasive Hemodynamics & Intervention (Cath Lab)

• Right Heart Catheterization: Pressures, cardiac output, resistances (PAH, transplant).
• Coronary Angiography: Gold standard for coronary anatomy.
• PCI (Angioplasty/Stenting): Balloon, DES, BRS, IVUS, OCT, FFR/iFR, rotablation, shockwave.
• Structural Interventions: TAVR, MitraClip, PFO/ASD closure, LAA occlusion, valve-in-valve.

Implantable Devices

• Pacemakers: Single/dual/CRT-P; leadless (Micra).
• ICDs: Single/dual/CRT-D; S-ICD (subcutaneous).
• Remote Monitoring: All modern devices transmit data wirelessly.

Mechanical Circulatory Support (Advanced)

• IABP: Temporary counterpulsation (cardiogenic shock, high-risk PCI).
• Impella: Percutaneous LVAD (2.5–5.5 L/min).
• ECMO: VA-ECMO for refractory shock/arrest.
• Durable LVAD: HeartMate 3 (destination therapy/bridge to transplant).

Surgical Instruments (Cardiac Surgeons)

• Median sternotomy/thoracotomy sets, cardiopulmonary bypass circuitry, aortic cross-clamps, cardioplegia delivery, anastomotic devices, valve sizers, suture (PTFE, polyester).

Tool selection is guided by clinical question, patient factors, and institutional capabilities.