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Abnormal Myocardial Blood Flow Reserve Observed in Cardiac Amyloidosis
Michael Chi Yuan Nam,Karen Nel,Roxy Senior,Kim Greaves 한국심초음파학회 2016 Journal of Cardiovascular Imaging (J Cardiovasc Im Vol.24 No.1
We performed real-time myocardial contrast echocardiography on a patient with cardiac amyloidosis and previous normal coronary angiography presenting with atypical chest pain to assess myocardial blood flow reserve (MBFR). Myocardial contrast echocardiography was performed and flash microbubble destruction and replenishment analysis was used to calculate myocardial blood flow. Dipyridamole was used to achieve hyperemia. MBFR was derived from the ratio of peak myocardial blood flow at hyperemia and rest. The results show a marked reduction in MBFR in our patient. Previous reports of luminal obstruction of intramyocardial rather than epicardial vessels by amyloid deposition may be causing microvascular dysfunction.
Invasive and Non-Invasive Imaging for Ischaemia with No Obstructive Coronary Artery Disease
Ming-Yen Ng,Hok Shing Tang,Lucas Chun Wah Fong,Victor Chan,Roxy Senior,Dudley John Pennell 아시아심장혈관영상의학회 2021 Cardiovascular Imaging Asia Vol.5 No.3
Ischaemia with no obstructive coronary artery disease (INOCA) affects up to 50% of patients referred for coronary angiography for suspected angina. Although originally thought to be benign, recent data shows that patients with INOCA have an adverse prognosis. There are challenges in identifying and managing the underlying cause, which is most often attributed to coronary microvascular disease or coronary vasospasm. This review will cover the clinical relevance and prognosis of INOCA as well as the invasive and non-invasive imaging techniques available to identify the underlying aetiology. Upcoming technological advancements will also be discussed.