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Prognostic value of perfusion cardiovascular magnetic resonance with adenosine triphosphate stress in stable coronary artery disease



Adenosine triphosphate (ATP) has been predominantly used in the Asia–Pacific region for stress perfusion cardiovascular magnetic resonance (CMR). We evaluated the prognosis of patients stressed using ATP, for which there are no current data.


We performed a retrospective longitudinal study from January 2016 to December 2020 and included 208 subjects with suspected obstructive coronary artery disease (CAD) who underwent ATP stress perfusion CMR. An inducible stress perfusion defect was defined as a subendocardial dark rim involving ≥ 1.5 segments that persisted for ≥ 6 beats during stress but not at rest. The primary outcome measure was a composite of major adverse cardiovascular events (MACE) including (1) cardiac death, (2) nonfatal myocardial infarction, (3) cardiac hospitalization, (4) late coronary revascularization. We compared outcomes in patients with and without perfusion defect using Kaplan–Meier and log rank tests. Significant predictors of MACE were identified using multivariable Cox regression analysis.


Median follow-up was 3.3 years. Patients with no stress perfusion defect had a lower incidence of MACE (p < 0.001), including lower cardiac hospitalization (p = 0.004), late coronary revascularization (p = 0.001) and cardiac death (p = 0.003). Significant independent predictors for MACE were stress induced perfusion defect (p < 0.001, hazard ratio [HR] = 3.63), lower left ventricular ejection fractino (LVEF) (p < 0.001, HR = 0.96) and infarct detected by late gadolinium enhancement (LGE) (p = 0.001, HR = 2.92).


Perfusion defects on ATP stress are predictive of MACE which is driven primarily by cardiac hospitalization, late coronary revascularization and cardiac death. Significant independent predictors of MACE were stress induced perfusion defect, lower LVEF and infarct detected by LGE.


Stress perfusion cardiac magnetic resonance (CMR) is a low-risk and non-invasive imaging modality for diagnosis of coronary artery disease (CAD) with high sensitivity, specificity and accuracy [1, 2]. Apart from its diagnostic accuracy, stress perfusion CMR is also recognized for its high prognostic value in risk stratification of patients of known or suspected CAD when using adenosine, dipyridamole and regadenoson as the vasodilator agent [3,4,5,6,7,8,9,10]. However, the prognostic value of adenosine triphosphate (ATP) as a vasodilator for stress CMR is not well-established. ATP has similar vasodilatory and hemodynamic changes to adenosine [11] and due to its lower cost and/ or licensing/ production issues of alternative pharmaceutical agents, it has been a commonly used alternative in the Asian Pacific region [11,12,13,14] and some European countries [15, 16]. Although ATP stress CMR might be assumed to have prognostic significance, this has never been demonstrated. Therefore, we performed this study to evaluate the prognostic significance of ATP stress CMR in order to confirm this hypothesis.


This study was approved by the Institutional Review Board of the Hong Kong West Cluster. Requirement for informed consent was waived. This study was a retrospective longitudinal study. Patients from the University of Hong Kong and Queen Mary Hospital’s database were identified from 1st January 2016 to 31st March 2019 and 1st January 2017 to 31st December 2017 respectively. Inclusion criteria were patients ≥ 18 years undergoing ATP stress CMR for suspected or known obstructive CAD. Exclusion criteria included coronary artery bypass grafts, known hypertrophic cardiomyopathy, myocarditis, implantation of cardiac pacemaker or implantable cardiac defibrillator, history of asthma or bronchospasm, incomplete notes to determine adequate stress and second or third-degree atrioventricular block. A total of 208 subjects were identified (see Fig. 1).

Fig. 1
figure 1

Patient flow diagram

CMR protocol

A 3 T CMR scanner (Achieva, Philips Healthcare, Best, the Netherlands) with a 16-element phased array coil or a 1.5 T CMR scanner (Aera, Siemens Healthineers, Erlangen, Germany) with a 32-element phased array coil were used in all cases. Subjects were given ATP at an infusion rate of 0.14 mg/kg/min for at least 3 min, followed by an intravenous administration of gadoterate meglumine (injection rate: 3 to 4 mL/s, with a subsequent 30 mL saline flush at the same flow rate) to obtain the first-pass perfusion images using a T1 weighted fast gradient echo sequence for both scanners. [Philips Achieva: echo time (TE) 1.2 ms, repetition time (TR) 2.5 ms, flip angle 20°, field of view 320 mm x 320 mm, slice thickness 10 mm, Siemens Aera: TE 0.98 ms, TR 177 ms, flip angle 50°, voxel size 2.3 × 2.3 x 8 mm]. Three perfusion short-axis slice images (base, mid, apex) of the left ventricle were acquired. This was followed by acquisition of a short-axis cine stack using balanced steady-state free precession (bSSFP) (3 T Philips Achieva: TE/TR = 1.48/2.96 ms, flip angle 45°, slice thickness 8 mm, 25 cardiac phases; 1.5 T Siemens Aera TE/TR 1.28/40.17 ms, voxel size 1.2 × 1.2x6mm. flip angle 62°, slice thickness 8 mm, 25 phases) and analyzed with cmr42 software (Circle Cardiovascular Imaging, Inc., Calgary, Alberta, Canada) or Syngo Via (Siemens Healthineers). Long axis bSSFP cine images were acquired in the 2, 3 and 4-chamber orientations. Rest perfusion images were acquired in the same three short axis positions as the stress perfusion images at least 10 min after termination of ATP infusion. Inversion time scout images were acquired to determine the ideal inversion time for late gadolinium enhancement (LGE). LGE images were acquired 8–15 min after the second gadoterate meglumine injection for rest perfusion images. For the 3 T Philips Achieva, segmented phase sensitive inversion recovery (PSIR) LGE images were acquired (TE 3 ms, TR 6.1 ms, flip angle 25 degrees, slice thickness 8 mm). For the 1.5 T Siemens Aera, PSIR LGE images were acquired (TE 3–4 ms, TR 8–9 ms, flip angle 25 degrees, slice thickness 8 mm).

Adequate stress response

Adequate stress response to ATP was defined as two or more of the following criteria: (1) heart rate increase ≥ 10 bpm, (2) systolic blood pressure decrease ≥ 10 mmHg, (3) positive splenic switch-off sign, and (4) presence of stress symptoms (e.g. chest pain, shortness of breath, headache). Inadequate stress was defined as 0 or 1 of the above criteria. A subsequent 50% increased infusion rate would be given for an inadequate stress response [17]. If adequate stress response was still not achieved, no further infusion rate increase was delivered.

ATP perfusion and LGE assessment

Following previous publications on prognostic significance of regadenoson, adenosine and dipyridamole stress CMR [7, 8, 18], we identified significant inducible stress perfusion defects on the stress perfusion images (see Fig. 2) as previously described [19]. Briefly a stress-induced perfusion defect was defined as a subendocardial rim of reduced signal involving ≥ 1.5 segments that persisted for ≥ 6 beats during stress but not at rest without matching enhancement on LGE imaging [19, 20]. Rest perfusion defects and perfusion defects matching LGE were not regarded as stress induced perfusion defects. Reporting radiologists and cardiologists were blinded to the clinical outcome. Reporting was performed by either one or two radiologists/ cardiologists. At a minimum one of those reporting had level 3 accreditation. Myocardial LGE was quantified using the cmr42 software (Circle Cardiovascular Imaging, Inc.) [21]. LGE was identified as 5 standard deviations above the mean.

Fig. 2
figure 2

Case of patient undergoing adenosine triphosphate (ATP) stress cardiovascular magnetic resonance (CMR). Stress perfusion (ac), rest perfusion (df), late gadolinium enhancement (LGE) (gi), left coronary artery catheter angiogram (G) and right coronary artery (RCA) catheter angiogram (H) images are illustrated. Stress induced perfusion defects (green arrows) are demonstrated in the left ventricular (LV) inferior wall on the basal and mid-ventricular slices (a, b) which resolves at rest (d, e). The left coronary artery catheter angiogram (j) shows collateral vessels coming from the left anterior descending coronary artery (LAD) and left circumflex coronary artery (LCX) to perfuse the RCA branches. LGE images (gl) show no evidence of infarction. RCA coronary angiogram (k) shows the RCA is occluded. Note, that the splenic switch-off sign is present (red arrows in c, f) with the spleen unenhanced during stress and the spleen enhancing during rest

CMR ventricular function, volume analysis and image quality assessment

Left ventricular (LV) function and volumes were assessed using the bSSFP short axis cine images and analyzed with cmr42 software (Circle Cardiovascular Imaging, Inc.) to give the following CMR parameters: (1) LV end-diastolic volume, (2) LV end-systolic volume, (3) LV ejection fraction (LVEF), and (4) LV mass. Volumes and mass were corrected for body surface area using the Mosteller equation [22]. Image quality scoring of the perfusion and LGE images were performed using a Likert scale from 1 to 4. A score of 1 being excellent and 4 being non-diagnostic. Fifty cases were chosen at random. Mean and standard deviation for perfusion and LGE image quality scoring were 1.4 (SD 0.6) and 1.8 (SD 0.6).

Major adverse cardiovascular events

The subsequent hospital-related activities of the subjects were obtained through the territory-wide Electronic Patient Record system, including any clinical follow-ups, inpatient and outpatient care records, and examinations performed. The primary outcome measure of this study is a composite of major adverse cardiovascular evvents (MACE) consisting of (1) cardiac death, (2) non-fatal myocardial infarction (MI), (3) cardiac hospitalization, and (4) late coronary revascularization. Cardiac hospitalization included any in-patient hospital stay due to a cardiovascular events (i.e. heart failure or acute coronary syndrome), while late coronary revascularization includes percutaneous coronary intervention, and coronary artery bypass grafting more than 90 days post stress CMR. We recorded all cardiovascular events these subjects experienced, and their first events were used for analysis regarding composite MACE. For the annualized event rate, we used cardiac death and non-fatal myocardial infarct events only in keeping with other publications and meta-analysis [8, 10].

Statistical analysis

Continuous variables are presented as mean ± standard deviations. Categorical variables are presented in numbers with percentages in brackets. Student’s t-test was used to compare normally distributed variables. Mann–Whitney U test was used to compare non-normally distributed variables. Categorical variables were compared using Fisher’s exact test.

The outcomes of subjects with and without inducible perfusion defects on ATP stress CMR findings were compared using Kaplan Meier survival curve with log rank test. Sub-analysis of each type of MACE was also performed with Kaplan Meier survival curve and log rank test to determine the main drivers of the composite MACE outcome. A multivariable Cox regression model was created using the variables stress induced perfusion defect, LGE infarct and LVEF which all had a p-value < 0.05 on univariate Cox regression analysis. All statistical analyses were done using SPSS (version 26.0, Statistical Package for the Social Sciences, International Business Machines, Inc., Armonk, New York, USA).


Subjects had a mean age of 61.2 ± 14.8 years and 123 were male (59.1%). Table 1 shows the characteristics of subjects with MACE compared to those without.

Table 1 Patient characteristics of study population (MACE vs without MACE)

Adequate stress response to standard dose and a 50% higher infusion rate was achieved in 196 (94.2%) and 12 (5.8%) cases respectively.

ATP side-effects

One hundred patients (48.1%) experienced symptoms during ATP infusion. Side-effects included chest pain, shortness of breath, headache, palpitation and hot flushing. The symptoms were mild and resolved shortly after the ATP infusion was completed. No medical complications were encountered. See Table 2 for the frequency of different side-effects experienced by subjects during stress test.

Table 2 Frequency of ATP side-effects experienced by subjects during stress test

Abnormal CMR findings

Out of 208 patients, 87 patients (male: female = 59:28) had abnormal CMR findings. Of these 87 patients, the patients had one or more of the following abnormalities: 35 (40.2%) had LVEF < 50%, 51 (58.6%) had MI detected by LGE, and 38 (43.7%) had stress induced perfusion defects. 6 patients (6.9%) had all three abnormalities, 25 (28.7%) had two of the three abnormalities, and 56 (64.4%) had only one of the three abnormalities.

Incidence of MACE composite endpoints

The median follow-up period was 3.3 years (interquartile range from 2.7 to 3.7 years).

Table 3 shows the incidence of MACE composites in patients with and without stress induced perfusion defects. Results of Kaplan Meier analysis showed that the primary endpoint of composite MACE was significantly different between patients with and without stress induced perfusion defects (p < 0.001) (Fig. 3). On sub-analysis of the individual endpoints, late coronary revascularization (p = 0.001), cardiac hospitalization (p = 0.004) and cardiac death (p = 0.003) were significantly different between the two groups (see Fig. 4a–d). There was no significant difference in non-fatal MI (p = 0.646) (see Fig. 4c).

Table 3 Incidence of composite endpoints in patients with and without stress inducible perfusion defects; MI, myocardial infarction
Fig. 3
figure 3

Incidence of composite major adverse cardiovascular events (MACE) between normal and abnormal stress test findings. Estimated cumulative incidence of composite MACE was significantly higher in subjects with abnormal stress findings (log rank p-value < 0.001)

Fig. 4
figure 4

Sub-analysis of the four parameters comprising the composite major adverse events end point (i.e. late coronary revascularization, cardiac hospitalization, non-fatal myocardial infarction and cardiac death) between patients with and without perfusion defects. Late coronary revascularization, cardiac hospitalization and cardiac death were significantly higher in subjects with stress induced perfusion defects (log rank p-value = 0.001, = 0.004 and = 0.003 respectively). There was no significant difference between the two groups in terms of non-fatal myocardial infarction

The annualised event rate for patients with no stress induced perfusion defect was 0.4% vs 2.8% for patients with perfusion defects (Table 4).

Table 4 Annualized event rates for patients with and without stress inducible perfusion defects

Predictors for higher incidence rate of MACE

Subjects with MACE had significantly higher age, smoking rates, estimated glomerular filtration rate, prevalence of atrial fibrillation, LV end-diastolic volume index, LV end-systolic volume index, LV mass index, resting heart rate, LVEF < 50%/ lower LVEF, infarct detected by LGE, stress induced perfusion defect (see Table 1). Univariate Cox regression analysis of these factors is shown in Additional file 1: Table S2.

Using multivariable Cox regression analysis, stress induced perfusion defect (p < 0.001, hazard ratio [HR] = 3.63), lower LVEF (p < 0.001, HR = 0.96) and infarct detected by LGE (p = 0.001 h = 2.92) were identified as the predictors for higher incidence of MACE (Table 5).

Table 5 Multivariable Cox regression model with stress induced perfusion defect, presence of LGE infarct and LVEF as variables. LVEF is a continuous variable


Our study showed that similar to other vasodilator stress agents, ATP stress CMR is also predictive of MACE. A stress induced perfusion defect on ATP stress CMR was associated with a higher risk of MACE (hazard ratio = 3.63) over a median follow-up of 3.3 years with an annualized event rate of 2.8%. The main drivers of this increased risk were the incidence of cardiac hospitalization, late coronary revascularization and cardiac death which were significantly higher in patients with stress induced perfusion defects on ATP stress CMR examinations. Alternatively, absence of a stress induced perfusion defect on ATP stress CMR had an annualized event rate of 0.4%. With multivariable cox regression analysis, stress induced perfusion defect, LVEF and MI detected by LGE were independent rick factors for MACE.

ATP has a short half-life of 20 s [23] and has vasodilatory effects like adenosine. Once ATP is infused intravenously, there is incremental cleavage of each phosphate compound. The resulting adenosine thus activates the A1 and A2 receptors producing the same vasodilatory effect as the more established intravenous adenosine infusion [24].

ATP is a readily accessible and less expensive in parts of the Asia Pacific region relative to other stress agents. The cost of ATP in our centre is approximately US$15 per patient whilst adenosine costs nearly US$70 per patient. An additional hurdle we have faced is the difficulty in obtaining adenosine and regadenoson in mainland China due to licensing and manufacturing issues. As such, centres in the Asia–Pacific frequently use ATP but the data supporting its use in CMR is not as extensive as other stress agents such as dobutamine, adenosine, dipyridamole and regadenoson [8, 18, 25]. Another issue with ATP is that centres in the Asia–Pacific region have sometimes mistaken adenosine and ATP as being the same agent. The current Society for Cardiovascular Magnetic Resonance guidelines has recently included ATP as a stress agent [26, 27] but the data supporting the imaging protocol are very limited. Evidence and drug availability are crucial in the development of stress CMR services as some countries in this region have limited access to well established stress agents (i.e. adenosine, dipyridamole and regadenoson) due to licensing issues, cost and production. Thus, this study provides timely evidence for the utilization of ATP as a stress agent for stress CMR. So far, data supporting the use of ATP has been primarily in nuclear myocardial perfusion imaging studies and the protocols have been adapted for stress CMR [11, 14].

This study also demonstrates a safe and clinically feasible ATP protocol with a starting infusion rate of 0.14 mg/kg/min in which no patients experienced significant complications. The most common side effects of ATP infusion in our study were shortness of breath, chest pain and headache which largely agree with a previous report [13]. However, these side effects were mild and resolved within 5 min after ATP infusion was stopped. Indeed, we also demonstrated the feasibility of increasing the ATP infusion rate by 50% in patients not responding adequately. This 50% increase in infusion rate has been safely demonstrated in adenosine stress CMR previously [17] but not in ATP stress CMR. Some studies have suggested that ATP should be given at slightly higher infusion rates of 0.16 mg/kg/min initially [24]. However, our study shows that with an infusion rate of 0.14 mg/kg/min 94.2% of patients are adequately stressed.

Compared to other studies assessing the prognostic significance of stress CMR, our study showed similar findings of increased MACE in patients with stress induced perfusion defects on stress CMR [8, 18]. Furthermore, we showed that a normal ATP stress CMR indicates a lower likelihood of MACE and adds to the growing literature that stress CMR has significant prognostic value with different pharmacological stress agents [2, 10, 28]. Thus, the choice of pharmacological stress agent should be dependent on a center’s previous experience, the availability of the pharmacological agent and the cost implications for health care.

In our study, stress induced perfusion defect, lower LVEF and LGE detected infarcts were independent predictors of MACE. Our finding of LGE and stress induced perfusion defect as independent predictors of MACE is consistent with previous publications by Freed et al. and Pontone et al. which looked at regadenoson and dipyridamole respectively [8, 18].


Our study has limitations. Firstly, this is a retrospective study in a Chinese population. Further research is needed to determine if this is generalizable to other populations worldwide. Secondly, our follow-up period is relatively short with relatively small number of patients with stress perfusion defects and a smaller number of patients with hard cardiovascular events. Thus, non-fatal MI although not significant in this study may actually be significant if the study length was increased and the number of subjects also increased. Nonetheless, our study still showed the prognostic value of ATP stress CMR for adverse cardiovascular events in Chinese population and data supporting the use of ATP stress CMR is required in this region to support the practice and development of stress CMR. Thirdly, we do not have other vasodilator agents like adenosine or dipyridamole for comparison to see if ATP is a comparable stress agent to more well-established stress agents for CMR. Lastly, not all patients underwent catheter/invasive coronary angiography to confirm the presence of obstructive CAD. Thus, a stress induced perfusion defect likely led to the patients undergoing catheter coronary angiography, however, the decision to revascularize was decided during the interventional procedure. In addition, our study follows previous studies in establishing the prognosis by not catheterizing all patients undergoing stress CMR [5, 8, 18].


ATP stress CMR has significant prognostic value. An abnormal ATP stress CMR with findings of stress-induced perfusion defect is predictive of higher MACE events. Patients with suspected obstructive CAD without a stress induced perfusion defect on ATP stress CMR have an annualized event rate of 0.4% versus 2.8% if a stress induced perfusion defect is present.

Availability of data and materials

The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.



Adenosine triphosphate


Balanced steady-state free precession


Coronary artery disease


Cardiovascular magnetic resonance


Hazard ratio


Left anterior descending coronary artery


Left circumflex coronary artery


Late gadolinium enhancement


Left ventricle/left ventricular


Left ventricular ejection fraction


Major adverse cardiovascular events


Myocardial infarction


Phase sensitive inversion recovery


Right coronary artery


Echo time


Repetition time


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We would like to acknowledge the help of Mr Tse Siu Tong, Mr Danny Wai-Man Cho, Ms Kah Au-Yeung, Ms Yan Ting Lee, Ms Winnie Cheung and Mr Ambrose Fong for their assistance with the project.


This project is supported by the SanMing Gong grant from the Shenzhen Ministry of Health, China.

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Authors and Affiliations



MYN, CYC contributed to study design. MYN, CYC, PMY, were responsible for data acquisition and/or analysis. MYN, CYC, EYFW performed statistical analysis. MYN, CYC, JSHH, SC, HFT, CBD, DJP, KHY contributed to drafting of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Ming-Yen Ng.

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Patient studies were conducted following human subject approval of the IRB of the Hong Kong West Cluster. All subjects gave informed written consent for study participation.

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MYN has received funding from Bayer and Circle Cardiovascular Imaging.

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Supplementary Information

Additional file 1: Table S1.

Patient characteristics of study population (without stress perfusion defect vs with stress perfusion defect). Table S2. Univariate Cox regression.

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Ng, MY., Chin, C.Y., Yap, P.M. et al. Prognostic value of perfusion cardiovascular magnetic resonance with adenosine triphosphate stress in stable coronary artery disease. J Cardiovasc Magn Reson 23, 75 (2021).

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