A comparison between cardiac CT scanning and cardiac digital subtraction angiography (DSA)

Abstract coronary thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis thrombosis arteria sickness affects nearly one tenth of the UK community and re main(prenominal)s the collaring ca white plague of death in the western earth. To investigate and leave behind interventions for coronary arterial root vessel indisposition, imaging of the coronary arteries to enable opticisation of atheromatic plaque is occupyd. This re thought process looked at the techniques of cardiac computed imaging see and cardiac digital entailment angiography, and their division to the investigation of coronary arteria affection. Comparison of the mathematical processs con spotred technique, shaft of light photograph, descent actor, clinical signs and efficacy in diagnosis of coronary arteria stricture. On similarity of the effectualness of the techniques, some(prenom inal) were shown to become been effective non-trespassing(a) r breakines that may be utilize to rule out diagnoses and avoid irrelevant habituate of invasive angiography. The research shows mixed take the stand for cardiac computed tomography angiography as a ravel of high specificity, however aesthesia and specificity of cardiac digital entailment angiography is high, and at that placefore evoke that the techniques may be useful in low risk patients. cornerstone coronary thrombosis arterial blood vessel indisposition remains the main cause of death in the UK and western world (Hacker, 2013 Liu et al., 2002) and contributes a substantial disease burden, affecting 7% of men and 5% of women in the UK in 1999 (Liu et al., 2002).coronary artery disease results from the build up of atherosclerotic plaque within the arteries supplying the myocardium. This plaque limits the melt of blood finished the arteries, and dejection cause ischemia of the sprightliness muscle. If the plaque becomes un constant and ruptures, this may lead to thrombus formation and the complete occlusion of an artery, resulting in a myocardial infarction (McClure et al., 2009).Acute coronary syndrome (ACS) is a sub-classification of coronary artery disease and encompasses unfit angina, non-ST nurture myocardial infarction and ST elevation myocardial infarction. ACS represents a range of conditions that result from thrombus formation in coronary arteries, and if untreated has poor prognosis and high death rate (NICE, 2010).To investigate and cater information for interventions for coronary artery disease and ACS, visualisation of the coronary arteries and any lesions cause by atherosclerotic plaque is required. Advances in technology deal given emanation to several sophisticated perfusion analysis techniques, which turn in greater symbol protect than structural imaging (Hacker, 2013). Perfusion analysis allows the blood flow through the coronary vessels to be observ ed and any ab figureities in the perfusion can be interpreted as a positional consequence of atherosclerotic changes within the vessels (Hacker, 2013).Currently, UK guidelines (NICE, 2010a) urge on coronary angiogram as first line way for patients presenting with ACS. This enables imaging of the coronary arteries to survey perfusion. It is primal to measure out the circulation as arteries can be affected from the soonest stages of endothelial dys extend to high- set up coronary artery stenoses (Hacker et al., 2010 Bugiardini et al. 2004 Kaufmann et al., 2000), and this provides the information necessary for prognosis and intervention. With the advances in technology, there argon today various symptomatic tests obtainable to assess coronary artery disease, including coronary angiography and computed tomography (CT) see (Gorenoi, Schonermark & Hagen, 2012).This go off aims to review the literature on coronary CT see and digital entailment angiography, their clinical app lications, techniques and comparative value in coronary artery estimate and diagnosis.cardiac digital deductive reasoning angiography coronary thrombosis angiography is the stuffy diagnostic procedure apply in coronary artery disease. It is a minimally invasive technique, whereby a catheter is displace into the radial or femoral artery and is advanced through the arterial system to the coronary arteries. A subscriber line performer is then injected at the aortic root and allows visualization of the arteries using x-ray in real metre at up to 30 frames per second. This allows a view of the extent, location and stiffness of coronary obstructive lesions such as atherosclerosis and enables prognostic indication (Miller et al., 2008). coronary thrombosis angiography too enables catheter placement either side of the lesion to assess pressure changes and determines the degree of flow obstruction (Miller et al., 2008). .Digital subtraction angiography (DSA) again works by introd ucing a billet agent into the coronary arteries and taking x-rays in real time, however a pre image is interpreted by x-ray. This allows for the post images to be subtracted from the original masque image, eliminating bone and soft tissue images, which would otherwise cover the artery under view (Hasegawa, 1987). Unlike courtly angiography, it is possible to conduct DSA via the venous system, through accessing the super vena cava via the basillic vein (Myerowitz, 1982). This removes the risks associated with arterial cannulation (Mancini & Higgins, 1985). The procedure can also be performed with a humiliate sexually transmitted disease of contrast agent and be through more quickly thereof eliminating constraints of using likewise much contrast during a procedure (Myerowitz, 1982).Whilst DSA is the metal(prenominal) standard in arterial imaging of carotid artery stenosis (Herzig et al., 2004), the application of DSA to the coronary arteries is extra repayable to effect a rtefacts associated with each heartbeat and airing (Yamamoto et al., 2009).There be numerous cardiac clinical applications of DSA, it can be utilize to assess coronary blood flow (Molloi et al., 1996), valvular regurgitation (Booth, Nissen & DeMaria, 1985), cardiac phase (Katritsis et al., 1988), congenital heart shunts (Myerowitz, Swanson, & Turnipseed, 1985), coronary electrical shunt grafts and percutaneous coronary intervention outcomes (Katritsis et al, 1988 Guthaner, Wexler & Bradley, 1985). However, others adjudge suggested that the coronary arteries be non visualized well out-of-pocket to their small size, movement, their position overlying the opacified aorta and left ventricle, and wonder with other structures such as the pulmonary veins (Myerowitz, 1982).cardiac CT Scanningontogenesis of CT scanning in the 1990s enabled an increase in profane resolution that was sufficient to view the beating heart, and they now provide a non-invasive technique for diagnostic and prognostic purposes. Cardiac CT scans have clinical applications that go beyond perfusion investigation, and can be used to assess structure and function of the heart (for example in electrophysiology disorders or congenital heart disease) due to its efficiency to provide anatomic detail (Achenbach & Raggi, 2010). CT scans can be used to assess coronary artery disease with and without injection of contrast agent (Achenbach & Raggi, 2010) by calcium scan or CT angiography.Coronary calcium CT scanning uses the separate instal that coronary artery calcium is a jibe of atherosclerosis (Burke et al., 2003) and is a bullnecked prognostic prognosticator of the future development of coronary artery disease and cardiac events (Arad et al., 2000 Budoff et al., 2009 Achenbach & Raggi, 2010). Calcium is easily depicted on CT scan due to its high CT attenuation, and is classified according to the Agatson score, which considers the density and area of the calcification (Hoffman, Brady & M uller, 2003).Coronary CT angiography (CTA) allows visualization of the coronary artery lumen to identify any atherosclerosis or stenosis within the vessels. Patients are injected intravenously with a contrast agent and then undergo a CT scan. There are limitations regarding the suit capability of patients for coronary CTA due to prerequisites of sinus rhythm, low heart rate and ability to follow breath-holding commands. Additionally, obesity presents a problem for patients that cannot rival into the scanner and affects the accuracy of the procedure. (Achenbach & Raggi, 2010).Comparison of cardiac DSA and cardiac CT scanningThe technical differences betwixt cardiac DSA and cardiac CT scanning give rise to differences in the clinical indications for the procedures, their diagnostic efficacy and also different risks or relative benefits to the patients.Due to the constitution of the images produced by coronary CTA and DSA, each lends itself to different indications for use. Whilst coronary DSA provides imaging of all aspects of perfusion, CTA used with contrast agent also provides this however has the additional advantage of be able to assess structure and function of the heart.Coronary CTA has been shown to have a high accuracy at detection and exclusion of coronary artery stenoses (Achenbach & Raggi, 2010). In a multicentre trial conducted by Miller et al. (2008), patients underwent coronary calcium scoring and CT angiography prior to unoriginal invasive coronary angiography. The diagnostic accuracy of coronary CTA at ruling out or espial coronary stenoses of 50% was shown to have a sensitivity of 85% and a specificity of 90%. This showed that coronary CTA was set forthicularly effective at ruling out non-significant stenoses. Additionally, coronary CTA was shown to be of equal efficacy as schematic coronary angiography at identifying the patients that subsequently went on to have revascularisation via percutaneous intervention. This was shown by an area under the booze-up (AUC), a measure of accuracy of 0.84 for coronary CTA and 0.82 for coronary angiography. Miller et al.s (2008) psychoanalyse intromitd a large number of patients at different study sites, and additionally represented a large sorting of clinical patient characteristics. The authors allege that these factors contribute to the strength and validity of the study divulgeings, and suggest that in addition to using patients with clinical indications for anatomical coronary imaging, should be used as essay that coronary CTA is accurate at identifying disease severity in coronary artery disease.Miller et al. (2008) did however,, find that positive predictive and negative predictive value of coronary CTA were 91% and 83% respectively and accordingly suggested that coronary CTA should not be used in place of the more accurate conventional coronary angiography. A low positive predictive value (in relation to the prevalence of disease) was proposed to be due to a tendency to overestimate stenosis degree as well as the presence of artefacts leading to dark positive recital (Achenbach & Raggi, 2010).Other research providing proportion between coronary CTA and conventional coronary angiogram has highlighted unevenness in results. A meta-analysis conducted by Gorenoi, Schonermark and Hagen (2012) investigated the diagnostic capabilities of coronary CTA and invasive coronary angiography using intracoronary pressure criterion as the reference standard. The authors erect that CT coronary angiography had a greater sensitivity than invasive coronary angiography (80% vs 67%), meaning that coronary CTA was more in all likelihood to identify useablely relevant coronary artery stenoses in patients. Despite this,, specificity of coronary CTA was 67%, compared to 75% in invasive coronary angiography, meaning that the technique was less effective at correctly excluding non-diagnoses than invasive coronary angiogram. This research appears to contradi ct the power of cardiac CTA at excluding diagnoses of coronary artery stenosis as suggested by Miller et al. (2008), he study did accede evidence from over 44 studies to provide their results and therefore had a large statistical power. The authors interpret the results in light of the clinical relevance of cardiac imaging, suggesting that patients with a higher pretest possibility of coronary heart disease will likely require invasive coronary angiography for revascularisation indicating that coronary CTA may be a subservient technique in those patients with an intermediate pre-test probability of coronary heart disease that will therefore not require invasive angiography.Goldberg et al. (1986) investigated the efficacy of DSA in comparison to conventional coronary angiography in 77 patients. They found that the two angiograms agreed within one grade of severity in 84% of single cases and 90% of multiple cases, identifying twain patent and lesioned arteries. The results led the authors to terminate that there was no significant difference between the two methods and that DSA could be used in discriminating coronary angiography to find results comparable to that of conventional angiography. In addition to being a small study into the efficacy of DSA, the study also had several kickoffs of organic variability that should be considered when interpreting the results. These included differing sizes of digital imaging diffuse and non-use of calipers, meaning that the interpretation of the images could depart throughout the study. The authors also suggest that whilst showing strong support for the use of DSA in coronary artery disease, the technique may not actually stomach better prognostic determinations or clinical judgements that are better than conventional angiography, and therefore the further slaying of the techniques may not be founded or necessitated. more than new-fashionedly, there has been further research looking at the effectiveness of DSA as a way of standard coronary blood flow. Whilst motion artefacts have proven a problem in lots of historical research (Marinus, Buis & Benthem, 1990 Hangiandreou, 1990), recent research has developed methods to denigrate these. Moilloi and colleaues (1996) showed that using a motion-immune dual-energy digital subtraction angiography, arrogant volumetric coronary blood flow could be measured accurately and thus provide an indication of the severity of any arterial stenosis.This may provide further suggestion for clinical implementation of DSA.Although these studies provide evidence for the efficacy of cardiac DSA and CTA, they often dumbfound comparisons to conventional angiography. This is useful as a baseline comparison, however it is difficult to make comparisons between the two procedures directly due to less available evidence making direct comparisons.Lupon-Roses et al. (1985) conducted a study canvas two coronary CTA and venous DSA. The study looked at the efficacy o f both techniques at diagnosing patency of coronary artery grafts compared to the control conventional angiography. CT was shown to diagnose 93% of the patent grafts and 67% of the hinder grafts whereas DSA correctly diagnosed 98% and 100% of patent and obstruct grafts respectively. Interestingly, the DSA picked up the 11 grafts that were misdiagnosed by CTA and the CTA picked up the 2 grafts misdiagnosed by the DSA. This data may suggest that individually, DSA has a better profile for diagnosis of coronary artery occlusion, however if the two procedures are used in combination exclusion of patent arteries and diagnosis of occluded arteries would be effective (Lupon-Roses et al., 1985).Coronary DSA and CTA are both non-invasive procedures (unlike the conventional coronary angiography where a wire is placed in the coronary vasculature). With the only invasive part of the procedure being the injection of the contrast square into a vein. This presents a significant advantage to bo th procedures over that of conventional angiography, and may even accept investigation on an outpatient basis (Meaney et al., 1980). Similarly, both DSA and coronary CTA are favoured because of their intravenous ascend, eliminating the risks of bleeding or arterial injury from an intra-arterial catheterization and being able to be used in those with limited arterial access. However, although the intravenous approach used in cardiac DSA makes it favourable, it does lead to difficultness with visualisation of the coronary arteries due to the overlying alter pulmonary and cardiac structures (Mancini & Higgins, 1985). Therefore,, intra-arterial DSA is also sometimes used (Yamamoto et al., 2009).As with all CT scanning, coronary CTA carries with it a dose of ionizing shaft (Brenner & Hall, 2007). Studies have estimated that for diagnostic CT scanning, patients are on average exposed to 12mSv of ray during the procedure, the equivalent of 600 x-rays (Hausleiter et al., 2009). Estima tes of radiation doses associated with conventional coronary angiography are lower than that of coronary CTA at 7mSv ( psyche et al., 2007). Additionally, DSA technique reduces the radiation dose from that of conventional coronary angiography as the vessels are visualised more clearly (Yamamoto et al., 2008). The dangers of radiation exposure are increased risk of developing cancer, unclothe injuries and cateracts (Einstein et al., 2007). It is therefore important that the benefits of conducting the procedure greatly outweigh the risk of radiation exposure. CT calcium scanning provides a low radiation dose at around 1mSv (Hunold et al., 2003).Cardiac CT calcium scanning does not require administration of a contrast agent, unlike in coronary CTA and DSA that use iodine based contrast agents. The risks associated with contrast agent include nephrotoxicity and risks of hives, sensitized reactions and anaphylaxis (Maddox, 2002). The amount of contrast agent used is partly dependent on the length of the procedure and how clearly the arteries can be visualised. For this reason, both cardiac CTA and DSA use less contrast agent that conventional coronary angiography (Brant-Zawadzki, et al., 1983). CT calcium scanning of the coronary arteries is therefore recommended in those with less likelihood of coronary artery disease (NICE, 2010).Both coronary CTA and DSA require interpretation by skilled physicians, and the importance of preparation and achieving intra-rater reliability should not be underestimated (Pugliese et al., 2009).ConclusionOverall, both coronary CT and DSA have been demonstrated as effective procedures for the imaging of the coronary arteries in hot dog (Achenbach & Raggi, 2010 Miller et al., 2008 Moilloi et al., 1996 Goldberg et al., 1986). Whilst cardiac CT scanning does provide a wider range of clinical applications, allowing assessment of perfusion as well as cardiac structure and function (Achenbach & Raggi, 2010), coronary DSA has many appl ications that allow assessment of coronary blood flow (Molloi et al., 1996 Katritsis et al, 1988 Booth, Nissen & DeMaria, 1985 Guthaner, Wexler & Bradley, 1985 Myerowitz, Swanson, & Turnipseed, 198).Both cardiac DSA and CTA procedures have their advantages. As non-invasive procedures, these techniques pose less risk to patients, and enable the possibility of outpatient investigation, to be used to rule out diagnoses and to avoid inappropriate invasive coronary angiogram (Gorenori et al., 2012). Additionally, intravenous access is preferential to arterial cannulation for the contrast infusion, removing the risks associated with bleeding or intra-arterial injury. Cardiac DSA exposes the patient to a lower dose of radiation that coronary CTA (Hausleiter et al., 2009 Yamamoto et al., 2008 Einstein et al., 2007), which is beneficial at reducing the risk of patrimonial mutations and cancer.Cardiac CTA and DSA also have their common disadvantages. The use of contrast agent may present sid e effects for the patient including kidney damage and risk of allergic reactions and anaphylaxis (Maddox, 2002). For this reason, calcium CT scanning can be useful in patients that are not at high likelihood of coronary artery disease (NICE, 2010b). Additionally, both cardiac DSA and CTA are subject to motion artefacts from respiration and heart beats, which can cause difficulties with interpretation (Achenbach & Raggi, 2010 Yamamoto et al., 2009). In the case of cardiac CTA, this excludes a subset of patients that are unable to follow commands and those who have high heart rates.Overall, cardiac CTA and cardiac DSA are effective, non-invasive imaging techniques for assessment of coronary artery disease. Whilst they are not the prosperous standards in cardiac monitoring, they can provide important diagnostic information without exposing patients to the risks of invasive angiography. Due to this, their use should be weighted against clinical need, the risks of the procedures, and th e suitability of the patient. reading of cardiac CTA and DSA imaging should be by trained individuals.ReferencesAchenbach, S., & Raggi, P. (2010) Imaging of coronary atherosclerosis by computed tomography. European Heart ledger. 311442Arad, Y., Spadaro, L. A., Goodman, K., Newstein, D., & Guerci, A. D. (2000). Prediction of coronary events with negatron beam computed tomography. daybook of the American College of Cardiology, 36(4), 1253-1260.Booth, D. 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