Лучшие больницы для «Coronary Artery Angiography (CAG)» в Ченнаи, Индия

Coronary artery disease (CAD) results from the progressive accumulation of atherosclerotic plaques within the intimal layer of the epicardial coronary arteries. Over time, lipid-laden plaques trigger inflammatory cascades, fibrous cap formation, and varying degrees of luminal narrowing — quantified angiographically as percent diameter stenosis. Hemodynamically significant stenoses (typically ≥ 70% in non-left main vessels, or ≥ 50% in the left main coronary artery) reduce coronary flow reserve, precipitating myocardial ischemia under stress or, in the setting of acute plaque rupture, causing unstable angina or acute myocardial infarction (AMI). Non-invasive modalities such as stress echocardiography, myocardial perfusion SPECT, cardiac CT angiography (CCTA), and CMR can detect ischemia with reasonable sensitivity, but coronary artery angiography remains the anatomical reference standard that uniquely allows simultaneous therapeutic intervention.

• ELIGIBILITY — CLINICAL INDICATIONS:
• Stable angina pectoris with objective evidence of ischemia on non-invasive testing (stress ECG, stress echo, nuclear perfusion imaging, or cardiac MRI)
• Acute Coronary Syndrome (ACS): Non-ST-elevation myocardial infarction (NSTEMI) with intermediate-to-high GRACE score, or ST-elevation myocardial infarction (STEMI) requiring primary PCI
• Suspected left main or multivessel disease with a high pre-test probability of significant CAD
• Pre-operative cardiac evaluation before major non-cardiac surgery in patients with known or high-risk CAD
• +27 more

Standard Diagnostic Coronary Angiography (conventional CAG):

The foundational technique involves selective catheterization of the left and right coronary ostia via either the transradial or transfemoral approach, using 5F or 6F diagnostic catheters (Judkins, Amplatz, or universal-tip designs). Cine-fluoroscopic image acquisition in standardized orthogonal and angulated projections (RAO/LAO cranial/caudal views) generates the two-dimensional luminogram that defines lesion severity by percent diameter stenosis (DS%). This approach remains the procedural standard for elective and semi-urgent diagnostic workups globally.

TRANSRADIAL vs. TRANSFEMORAL ACCESS:

The transradial approach (TRA) is now the preferred default at all GAF Healthcare partner centers, supported by Level IA evidence from landmark trials (RIVAL, MATRIX). TRA reduces major access-site bleeding by 60–70%, eliminates the need for bed rest post-procedure (patients ambulate within 1–2 hours), shortens hospital stay to a single-day or overnight admission, and significantly reduces vascular complications compared to transfemoral access. The transfemoral approach remains available for cases with documented radial artery occlusion, severe forearm anatomy anomalies, or high-complexity ad-hoc PCI requiring large-bore access (7F–8F).

PRE-PROCEDURE PHASE (Days -7 to 0):

Day -7 to -3 (Remote/Arrival): GAF Healthcare coordinates electronic transmission of all prior medical records, imaging (ECHO, stress test, CCTA), and laboratory results to the designated interventional cardiologist at the partner hospital. A tele-consultation is arranged for the patient to meet their cardiologist virtually, review findings, confirm the indication for CAG, discuss procedural risks and benefits, and obtain preliminary informed consent. Medication review is conducted: patients on anticoagulants (warfarin, NOACs) receive bridging or cessation instructions; metformin is typically withheld 48 hours before and after contrast exposure in patients with eGFR < 60 mL/min/1.73 m²; dual antiplatelet therapy (DAPT) instructions are issued based on clinical scenario.

Day -1 to 0 (Hospital Admission / Pre-Op Assessment): Patient is admitted to the hospital (or attends a pre-admission clinic for day-procedure cases). Baseline investigations are repeated or verified: ECG, CBC, renal function, coagulation, blood glucose, blood group. An allergy history is formally documented; patients with prior contrast reactions receive premedication (methylprednisolone 32 mg orally at 12 and 2 hours pre-procedure + diphenhydramine 50 mg IV/IM 1 hour pre-procedure). Renal protection protocol (IV 0.9% NaCl hydration at 1 mL/kg/hr for 3–12 hours pre-procedure) is initiated for patients with eGFR 30–60 mL/min/1.73 m². The radial artery is assessed with a modified Allen's test and Barbeau test to confirm ulnar collateral patency before committing to transradial access. The patient is kept NPO for 4–6 hours before the procedure.