ct coronary angiography (ctca)
DESCRIPTION
CT Coronary Angiography (CTCA)TRANSCRIPT
CT Coronary Angiogram
(CTCA)
What is it? Use of Computed Tomography to image a
beating heart
Non invasive
Good visualisation of the coronary vessels
Provides useful diagnostic information regarding coronary artery disease (CAD)
Conjoint Committee for Recognition of Training in
CTCA Body that governs specialists in Australia and
New Zealand who report CTCA
Radiologist, Cardiologists and Nuclear Medicine Physicians
Complete requisite training criteria
Level A: 150 live and library cases (300 cases every 3 years)
Level B: 300 live and library cases (600 every 3 years)
Why Refer for a CTCA
Examination of coronary artery that is
Low risk
Low radiation
Non invasive
Why Refer for a CTCA
Accurately detect and grade stenosies or narrowing
Demonstrate developmental anomalies of cornary vessels
Check patency of existing grafts
Patients who would benefit…
Suspected CAD
Presents with atypical chest pain
Coronary artery anomaly
Asymptomatic atherosclerosis with known CAD
Post by-pass surgery patients
Indications Based on Framingham criteria (risk score),
previous nuclear and stress echocardiogram or coronary angiography
Framingham criteria is a risk score assessment tool based on a study of
11,611American patients
20-76 years
No self reported CAD, stroke, peripheral arterial dusease or diabetes
Indications Framingham criteria/risk score is based on:
Age
Total cholesterol
HDL cholesterol
Smoking history
Systolic blood pressure
Indications
Results
82% Low: 10% of less CAD risk at 10 years
16% Intermediate: 10-20% CAD risk at 10 years
3% High: More than 20% CAD risk at 10 years
High risk category mainly contained advanced age and male gender
Risk calculator available on internet
Indications Chest pain (Low to intermediate pre test
probability)
CABG and stents (stent length <3mm)
Cardiac conditions
Non coronary valvular surgery
Unexplained heart failure and arrythmias
Coronary anomalies
AF Ablation
Early detection/screening
Rebatable Indications for CTCA
Stable symp;toms consistent with coronary ischaemia, low to intermediate risk or CAD, people who have been considered for coronary angiography
Undergoing non-coronary cardiac surgery
Exclusion of artery anomaly
Comparison of CTCA with Selective Coronary Angiography (>50% luminal
stenosis)n CAD
Prevelance
Sensitivity
Specificity
PPV NPV
ACCURACY
230 25% 95% 83% 64% 99%
CORE64 291 56% 85% 90% 91% 83%
Dutch Study
360 68% 99% 64% 86% 97%
Patient Preparation…
Withould caffeine from midnight prior to examination
4hr fast
BP and HR measurement
If HR >60-65bpm : betablocker
ECG monitoring (gated study)