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Computed tomography coronary angiography in asymptomatic patients

Angiografia coronarica con tomografia computerizzata in individui asintomatici

  • Cardiac Radiology / Cardioradiologia
  • Published:
La radiologia medica Aims and scope Submit manuscript

Abstract

Purpose

This study assessed the accuracy of computed tomography coronary angiography (CT-CA) for detecting significant coronary artery disease (CAD; ≥50% lumen reduction) in intermediate/high-risk asymptomatic patients.

Materials and methods

A total of 183 consecutive asymptomatic individuals (92 men; mean age 54±11 years) with more than one major risk factor (obesity, hypertension, diabetes, hypercholesterolaemia, family history, smoking) and an inconclusive or nonfeasible noninvasive stress test result (stress electrocardiography, stress echocardiography, nuclear stress scintigraphy) underwent CT-CA in an outpatient setting. All patients underwent conventional coronary angiography (CAG) within 4 weeks. Data from CT-CA were compared with CAG regarding the presence of significant CAD (≥50% lumen reduction).

Results

Mean calcium score was 177±432, mean heart rate during the CT-CA scan was 58±8 bpm and the prevalence (per-patient) of obstructive CAD was 19%. CT-CA showed single-vessel CAD in 9% of patients, two-vessel CAD in 9% and three-vessel CAD in 0%. Per-patient sensitivity, specificity, positive predictive value and negative predictive value of CT-CA were 100% (90–100), 98% (96–99), 97% (85–99), 100% (97–100), respectively. Positive and negative likelihood ratios were 151 and 0, respectively.

Conclusions

CT-CA is an excellent noninvasive imaging modality for excluding significant CAD in intermediate/ high-risk asymptomatic patients with inconclusive or nonfeasible noninvasive stress test.

Riassunto

Obiettivo

Obiettivo di questo lavoro è stato valutare l’accuratezza diagnostica dell’angiografia coronarica con tomografia computerizzata (CT-CA) nell’individuazione delle stenosi coronariche significative (riduzione del lume coronarico >-50%) confrontata con la coronarografia convenzionale (CAG) in una popolazione di soggetti asintomatici a rischio intermedio/alto.

Materiali e metodi

Centottantatre soggetti consecutivi asintomatici (92 maschi e 91 femmine; età media 54±11 anni) con più di un fattore di rischio (obesità, ipertensione arteriosa, diabete mellito, dislipidemia, familiarità, fumo di sigaretta) e stress test inconclusivo o non eseguibile (stress elettrocardiogramma [ECG], stress ecocardiografia, o stress tomografia computerizzata a emissione di fotoni singoli [SPECT]) sono stati sottoposti a CT-CA. Tutti i pazienti sono stati sottoposti a coronarografia convenzionale (CAG) entro 4 settimane dalla CT-CA. I risultati della CT-CA sono stati confrontati con la CAG per la rilevazione di stenosi coronariche significative.

Risultati

Il calcium score medio, la frequenza cardiaca media e la prevalenza di malattia per paziente sono risultati 177±432, 58±8 battiti per minuto (bpm), e 19%, rispettivamente. La CT-CA ha mostrato malattia significativa mono-vasale nell’9% dei casi, bi-vasale nel 9% dei casi, e tri-vasale in nessun paziente. La sensibilità, specificità, valore predittivo positivo della CT-CA per paziente sono risultati 100% (90%–100%), 99% (96%–99%), 97% (85%–99%), 100% (97%–100%), rispettivamente. I likelihood ratio positivo e negativo per paziente sono risultati 151 e 0, rispettivamente.

Conclusioni

La CT-CA è un ottimo strumento per l’esclusione di malattia coronarica significativa nel asintomatico ad intermedio/alto rischio con stress test in conclusivo o non eseguibile.

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Correspondence to F. Cademartiri.

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Maffei, E., Palumbo, A., Martini, C. et al. Computed tomography coronary angiography in asymptomatic patients. Radiol med 116, 1161–1173 (2011). https://doi.org/10.1007/s11547-011-0723-4

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  • DOI: https://doi.org/10.1007/s11547-011-0723-4

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