Takefumi Oka

Takotsubo syndrome complicated by left ventricular thrombus and free wall rupture leading to cardiac arrest: a case report of successful life-saving surgical treatment

Chihiro Morisue, Dai Kawauchi, Kei Yunoki, Noriyuki Tokunaga et autres

Background: Takotsubo syndrome (TTS) is a stress-induced cardiomyopathy that causes transient left ventricular dysfunction. Although generally considered benign, TTS occasionally leads to serious complications such as cardiac rupture or left ventricular thrombus, both of which carry significant risks. Case summary: A 69-year-old …

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Age-Stratified Effect of Rivaroxaban Monotherapy for Atrial Fibrillation in Stable Coronary Artery Disease

Junichi Yamaguchi, Hiroyuki Arashi, Nobuhisa Hagiwara, Satoshi Yasuda et autres

Importance: Antithrombotic therapy is crucial for older patients with coronary artery disease (CAD) and atrial fibrillation (AF) who are at a high risk of bleeding and thrombotic events. Objective: To examine the age-stratified effects of rivaroxaban monotherapy compared with those of rivaroxaban …

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Cutting Balloon Blade Fracture in Severe Calcified Lesions During Percutaneous Coronary Intervention

Dai Kawauchi, Kei Yunoki, Tomohiro Yoshino, Takefumi Oka

BACKGROUND: Cutting balloon (CB) blade fracture is a rare but potentially serious complication that may cause coronary dissection, rupture, or stent extraction. Our understanding of which lesions, procedures, and maneuvers precipitate blade fracture is limited. CASE SUMMARY: We report 3 cases of …

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Successful weaning from hemodialysis by percutaneous transluminal renal angioplasty in a patient with a solitary kidney and acute kidney injury caused by renal artery occlusion

Kanako Yokomizo, Mayuko Imamura, Kei Yunoki, Ryuta Takenaka et autres

There is no clear consensus on the indication for percutaneous transluminal renal angioplasty (PTRA) in cases of acute kidney injury caused by renal artery stenosis or occlusion in patients with a solitary kidney. A 79-year-old man with a solitary kidney presented with …

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Brugada phenocopy in fulminant eosinophilic myocarditis: a case series

Dai Kawauchi, Kei Yunoki, Tomohiro Yoshino, Takefumi Oka

Background: Brugada phenocopy (BrP) is a condition that induces reversible Brugada-like electrocardiographic (ECG) changes in patients without true Brugada syndrome. We present two cases of fulminant eosinophilic myocarditis that showed Type 1 Brugada ECG changes in the early phase of the clinical …

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Early recurrence of spontaneous coronary artery dissection: potential association with coronary vasospasm and optimal timing for spasm provocation test—a case series

Toyohiro Endo, Kei Yunoki, Katsunori Miyahara, Satomi Yamaguchi et autres

Background: Spontaneous coronary artery dissection (SCAD) is an uncommon cause of acute coronary syndrome (ACS). Various factors predispose individuals to SCAD, including coronary vasospasm, which has been identified in some studies as a related factor. Case summary: recurrence potentially related to coronary …

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Author’s reply: An unusual case of two acute coronary syndrome episodes caused by allergic and non-allergic coronary artery dissection with potential coronary vasospasm association: a case report

Tomohiro Yoshino, Kei Yunoki, Takefumi Oka

We thank Dr. Kounis for his interest and useful comments1 on our recent article presenting an unusual case of two acute coronary syndrome (ACS) episodes caused by allergic and non-allergic coronary artery dissection.2 With regard to the important issues in this report …

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Impact of Serum Indoxyl Sulfate on One-Year Adverse Events in Chronic Kidney Disease Patients with Heart Failure

Keiichiro Iwasaki, Toru Miyoshi, Chikara Urabe, Satoru Sakuragi et autres

Background/Objectives: Indoxyl sulfate, a uremic toxin, is associated with mortality and cardiovascular events in patients with chronic kidney disease (CKD). This study aimed to evaluate the prognostic implications of serum indoxyl sulfate levels in patients with heart failure and CKD. Methods and …

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An unusual case of two acute coronary syndrome episodes caused by allergic and non-allergic coronary artery dissection with potential coronary vasospasm association: a case report

Tomohiro Yoshino, Kei Yunoki, Katsunori Miyahara, Jun Ida et autres

Background: Type I variant Kounis syndrome is characterized by coronary spasm following an allergic or anaphylactic reaction. Coronary spasm is also recognized as a contributing factor in spontaneous coronary artery dissection (SCAD). Case summary: A 46-year-old woman presented to the emergency room …

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Impact of Serum Indoxyl Sulfate on One-year Adverse Events in Chronic Kidney Disease Patients with Heart Failure

Keiichiro Iwasaki, Toru Miyoshi, Chikara Urabe, Satoru Sakuragi et autres

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Unusual optical coherence tomography findings resembling sea anemone tentacles after orbital atherectomy for nodular calcification lesions in a haemodialysis patient: a case report

Mayuko Imamura, Kei Yunoki, Katsunori Miyahara, Takefumi Oka

Background: Optical coherence tomography (OCT) can be used to characterize the details of calcified plaques because it allows high-resolution evaluation of coronary plaques, thrombi, and calcium. Case summary: A 72-year-old man on haemodialysis who had stenosis with a severe calcified lesion at …

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Severe Aortic Regurgitation Due to Aortic Valve Injury During Percutaneous Coronary Intervention

Ryohei Fujimoto, Kei Yunoki, Katsunori Miyahara, Yuki Ohga et autres

Iatrogenic acute aortic regurgitation (AR) is an uncommon condition, and its presentation as severe AR following coronary angiography or percutaneous coronary intervention (PCI) is exceedingly rare. We report a case of iatrogenic severe AR resulting from aortic valve injury caused by manipulation …

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