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We evaluated regional myocardial strain by speckle tracking during dobutamine stress echocardiography (DSE) in patients with MB in the left anterior descending coronary artery (LAD). We studied 11 patients with MB in the LAD and no obstructive coronary artery disease (CAD), 7 patients without MB, but obstructive CAD in the LAD, and 12 controls without MB or obstructive CAD. MB was defined as either\u2009&gt;\u20091\u00a0mm (superficial) or\u2009&gt;\u20092\u00a0mm (deep) intramyocardial course of the LAD in coronary CT angiography. Regional longitudinal, radial and circumferential strains and strain rates as well as post-systolic strain index (PSI) were measured at rest, peak stress, and early recovery (1\u00a0min after stress). Strain parameters during DSE were similar in the myocardium distal to MB and other myocardial regions of the same patients as well as the LAD territory in controls. However, patients with obstructive CAD showed impaired LS and strain rate as well as increased PSI at peak stress. None of the MB was associated with systolic compression in invasive coronary angiography and strain parameters were similar between superficial and deep MB. Stress myocardial blood flow by positron emission tomography correlated with LS and RS at peak stress in the myocardium distal to MB (r\u2009=\u2009\u2212\u00a00.73, p\u2009=\u20090.03, and r\u2009=\u20090.64, p\u2009=\u20090.04, respectively). Myocardial strain is not reduced during DSE in patients with MB in the LAD and no significant systolic compression.<\/jats:p>","DOI":"10.1007\/s10554-024-03239-z","type":"journal-article","created":{"date-parts":[[2024,9,13]],"date-time":"2024-09-13T17:07:32Z","timestamp":1726247252000},"page":"2345-2355","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["The effects of myocardial bridging on two-dimensional myocardial strain during dobutamine stress echocardiography"],"prefix":"10.1007","volume":"40","author":[{"given":"Haitham","family":"Ballo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valtteri","family":"Uusitalo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mikko","family":"Pietil\u00e4","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria","family":"Wendelin-Saarenhovi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Markku","family":"Saraste","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Juhani","family":"Knuuti","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Antti","family":"Saraste","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,9,13]]},"reference":[{"key":"3239_CR1","first-page":"9","volume":"8","author":"G Ciliberti","year":"2022","unstructured":"Ciliberti G, Laborante R, Di Francesco M, Restivo A, Rizzo G, Galli M et al (2022) Comprehensive functional and anatomic assessment of myocardial bridging: unlocking the Gordian Knot. 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The authors affirm that human research participants provided informed consent for publication of the images as in Fig.\u00a0.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"The study was performed according to the Declaration of Helsinki, it was approved by the local ethics committee.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}]}}