Vol 80, No 1 (2022)
Clinical vignette
Published online: 2021-12-02

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  • „ Clinical vignette

Dynamic computed tomography perfusion imaging for detection of cardiac allograft rejection and myocardial ischemia in a heart transplant recipient

Anna Oleksiak1*, Małgorzata Sobieszczańska-Małek2*, Mariusz Kruk3, Tomasz Zieliński2, Krzysztof Komuda2, Cezary Kępka3

1Department of Intensive Cardiac Therapy, National Institute of Cardiology, Warszawa, Poland

2Department of Heart Failure and Transplantology, National Institute of Cardiology, Warszawa, Poland

3Department of Coronary and Structural Heart Diseases, National Institute of Cardiology, Warszawa, Poland

*Both authors equally contributed to the study

Correspondence to:

Anna Oleksiak, MD, PhD,

Department of Intensive Cardiac Therapy,

National Institute of Cardiology,

Alpejska 42, 04–628 Warszawa, Poland,

phone: +48 22 343 43 14,

e-mail: aoleksiak@ikard.pl

Copyright by the Author(s), 2022

DOI: 10.33963/KP.a2021.0168

Received: November 6, 2021

Accepted: December 2, 2021

Early publication date: December 2, 2021

Cardiac allograft rejection (CAR) is one of the most common complications and the main determinant of morbidity and mortality in the first year after orthotopic heart transplantation (OHT) [1]. Therefore, an accurate and fast diagnosis of CAR is crucial for early treatment, especially since effective immunosuppressive therapies are available. The gold standard screening tool for CAR is endomyocardial biopsy (EMB), which requires radioscopy and is associated with a 0.2%–5.5% risk of serious complications. Biopsy-negative rejection is a clinically important well-known phenomenon with 10%–20% incidence [2].

Several studies have reported that cardiac magnetic resonance (CMR) could detect CAR [3, 4]. A novel imaging method dynamic computed tomography perfusion (CTP) has specificity and sensitivity comparable to CMR. The role of CTP in patients after heart transplantation was described for the first time in our pioneer pilot study [5].

In this case, a 27-year-old woman with end-stage heart failure due to dilated cardiomyopathy underwent OHT on June 2. The donor was a 43-year-old man after head trauma. The cold ischemic time was 170 minutes.

The patient was treated with oral immunosuppression (tacrolimus, mycophenolate mofetil, and prednisolone). An EMB performed on June 12 revealed revealed numerous concentrations of inflammatory infiltrates with the destruction of cardiomyocytes and a Quilty effect (grade 2R). Pulse IV steroids were continued for three days. A second EMB (June 19) showed improvement (grade 1R). A third EMB (June 25) demonstrated recovery (grade 0R). However, on the electrocardiogram (ECG), ischemic ST-T changes were observed (Figure 1E). Computed tomography coronary angiography revealed a myocardial bridge in the mid-segment of the left anterior descending artery, and the dynamic CTP showed diffuse irregular areas of hypoperfusion (a “midwall patchy pattern” [MPP]) in the basal and mid segments of the left ventricle (Figure 1AD) [5].

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Myocardial ischemia caused by a myocardial bridge was detected in myocardial segments 13, 14, 15, 16, and partly in 7. Quantitatively, the myocardial blood flow in the segments classified as normal was 144.9 (143.2147.1) ml/100 ml/min, 114.0 (109.7115.0) ml/100 ml/min in the segments with the MPP, and 98.1 (93.2103.0) ml/100 ml/min in the ischemic segments. The radiation dose was 2.6 mSv. In the fourth EMB, performed after the CTP, grade 1R was found. Considering the low representation of the MPP in the septal segments, it was problematic to prove the ACR grade in the biopsy due to the random localization of the biopsy site.

To conclude, dynamic CTP is a newly developed non-invasive diagnostic method, and its advantages include safety, simplicity, low cost, and that it can be performed in patients with electrodes. As the presented case showed, it is possible to distinguish between ischemic lesions and those associated with rejection in the myocardial tissue in CTP, but these preliminary observations require confirmation in a larger group. The extremely rare presentation of the myocardial bridge in the transplanted heart made this case more interesting because donor’s hearts are not tested for this type of anomaly. ECG ischemic ST-T changes after OHT are always suspicious and need further investigation.

Article information

REFERENCES

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Polish Heart Journal (Kardiologia Polska)