Publications by authors named "Tuomas O Kiviniemi"

Objective: Iron supplementation may reduce postoperative anemia, blood transfusions, and infections in patients undergoing surgery. We sought to assess efficacy and safety of prophylactic intravenous iron supplementation in patients without anemia undergoing cardiac surgery.

Methods: In this investigator-initiated industry-sponsored single-center randomized double-blind parallel group trial, we enrolled patients undergoing coronary bypass, aortic or mitral valve or ascending aortic surgery who fulfilled prespecified iron blood test safety criteria.

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Objectives: Cardiac surgery induces systemic inflammatory response syndrome (SIRS), leading to higher morbidity and mortality. There are no individualized predictors for worse outcomes or biomarkers for the multifactorial, excessive inflammatory response. The interest of this study was to evaluate whether a systematic use of the SIRS criteria could be used to predict postoperative outcomes beyond infection and sepsis, and if the development of an exaggerated inflammation response could be observed preoperatively.

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Objective: Patients undergoing heart surgery are at high risk of postoperative fluid accumulation due to long procedures and cardiopulmonary bypass. In the present study, we sought to investigate the prevalence of postoperative fluid accumulation and its relation to adverse events in patients undergoing cardiac surgery.

Methods: CAREBANK is prospective, single-center cohort study focusing on the adverse events after cardiac surgery.

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Heart failure (HF) is a disease related to impaired performance of the heart and is a significant cause of mortality and treatment costs in the world. During its progression, HF causes worsening (decompensation) periods which generally require hospital care. In order to reduce the suffering of the patients and the treatment cost, avoiding unnecessary hospital visits is essential, as hospitalization can be prevented by medication.

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Background: Patients with atrial fibrillation (AF) are selected for oral anticoagulation based on individual patient characteristics. There is little information on how clinical AF burden associates with the risk of ischaemic stroke or systemic embolism (SSE). The aim of this study was to explore the association of the frequency of cardioversions (CV) as a measure of clinical AF burden on the long-term SSE risk, with a focus on patients at intermediate stroke risk based on CHADS-VASc score.

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Patients undergoing cardiac surgery develop a marked postoperative systemic inflammatory response. Blood transfusion may contribute to disruption of homeostasis in these patients. We sought to evaluate the impact of blood transfusion on serum interleukin-6 (IL-6), hypoxia induced factor-1 alpha (HIF-1α) levels as well as adverse outcomes in patients undergoing adult cardiac surgery.

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Thromboembolism prophylaxis after biologic aortic valve replacement (BAVR) is recommended for 3 months postoperatively. We examined the continuation of oral anticoagulation (OAC) treatment and its effect on the long-term prognosis after BAVR. We used nation-wide register data from 4,079 individuals who underwent BAVR.

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Background: There are limited data on the association of minor troponin elevation in unselected patients with atrial fibrillation (AF) presenting to the emergency department (ED) with adverse events. In this study, we sought to assess the early and mid-term mortality of these patients.

Methods: In this observational study, 2911 patients with AF were admitted to the ED.

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Objectives: Atrial fibrillation (AF) is a common complication after cardiac surgery. More knowledge is needed about long-term AF recurrence and adverse outcomes related to new-onset AF (NOAF) during the index hospitalization.

Methods: A total of 1073 patients underwent isolated surgical aortic valve replacement at the 4 participating hospitals (2002-2014).

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This cohort study investigates heart rate and cardiac troponin levels in patients admitted to the emergency department with symptomatic atrial fibrillation.

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Objectives: Postpericardiotomy syndrome (PPS) is a relatively common complication after cardiac surgery. However, long-term follow-up data on the adverse events and mortality of PPS patients requiring invasive interventions are scarce.

Methods: We sought to assess the occurrence of mortality, new-onset atrial fibrillation (AF), cerebrovascular events, and major bleeds in PPS patients requiring medical attention in a combination database of 671 patients who underwent isolated surgical aortic valve replacement with a bioprosthesis (n = 361) or mechanical prosthesis (n = 310) between 2002 and 2014 (Cardiovascular Research Consortium-A Prospective Project to Identify Biomarkers of Morbidity and Mortality in Cardiovascular Interventional Patients [CAREBANK] 2016-2018).

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Article Synopsis
  • The study aimed to identify genetic variants causing cardiac conduction system disease (CCSD) in patients using whole-exome sequencing (WES) and evaluate the effectiveness of functional studies in determining pathogenicity.
  • Researchers conducted WES on 23 patients with early-onset CCSD and analyzed 117 genes associated with heart conditions, identifying five patients with pathogenic protein truncating variants and finding 21 additional variants of uncertain significance.
  • Functional analyses using zebrafish models demonstrated that certain genetic variants affected heart function, leading to a reclassification of some variants from uncertain to likely pathogenic in six patients, highlighting the potential of such studies in genetic research.
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Patients with atrial fibrillation (AF) presenting to the emergency department (ED) often have elevated cardiac troponin T (TnT) levels without evidence of type 1 myocardial infarction. We sought to explore the causes and significance of minor TnT elevations in patients with AF at the ED. All patients with AF admitted to the ED of Turku University Hospital between 1 March, 2013 and 11 April, 2016, and at least two TnT measurements, were screened.

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. To investigate nationwide changes in procedure rates, patient selection, and prognosis after all surgical aortic valve replacements. .

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Background: We aimed to determine the relative frequency of affected cerebrovascular territories in patients with atrial fibrillation (AF) suffering an ischemic stroke.

Methods: Altogether, 1,976 patients who suffered their first-ever ischemic stroke during 2003-2012 and were diagnosed with AF either before or within 30 days after the event were included in this retrospective multicenter cohort study. Strokes were classified radiographically to be located either within the anterior or the posterior cerebrovascular territory, and the effect of the CHADS-VASc score, oral anticoagulant (OAC) use, and timing of AF diagnosis on lesion localization was determined.

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Cardioversion is an essential component of rhythm control strategy for atrial fibrillation. The thromboembolic risk of cardioversion is well established and the mechanisms behind the phenomenon have been comprehensively described. There are several clinical aspects that are important to take into consideration when assessing the safety of cardioversion.

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CHADS-VASc and HAS-BLED scores stratify the risk of thromboembolic and bleeding events respectively in patients with atrial fibrillation. There is only little information on how they differentiate which of the 2 clinically most important complications (ischemic stroke [IS] or an intracranial bleeding [IB]) the patient is more prone to suffer. We evaluated both scores in patients with either of these major complications.

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Objectives: Contemporary, nationwide data on trends in mitral valve surgery are scarce. Our aim was to investigate changes in procedure rates, patient selection, and post-procedural prognosis of open-heart mitral valve surgery in Finland.

Design: We combined data from three nationwide administrative registers with compulsory reporting.

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Introduction: Severe warfarin overanticoagulation is a risk factor for bleeding, but there is little information on its manifestations, prognosis and factors affecting the outcome. We describe the manifestations and clinical outcomes of severe warfarin overanticoagulation in a large group of patients with atrial fibrillation (AF).

Material And Methods: All international normalized ratio (INR) samples (n = 961,431) in the Turku University Hospital region between 2003 and 2015 were screened.

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Background: The aim of this study was to investigate the incidence of permanent working disability (PWD) in young patients after percutaneous or surgical coronary revascularization.

Methods And Results: The study included 1035 consecutive patients ≤50 years old who underwent coronary revascularization [910 and 125 patients in percutaneous coronary intervention (PCI) and coronary artery bypass grafting (CABG) groups, respectively] between 2002 and 2012 at 4 Finnish hospitals. The median follow-up time was 41 months.

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Vitamin K antagonist warfarin is widely used in clinical practice and excessive anticoagulation is a well-known complication of this therapy. Little is known about permanent and temporary predictors for severe overanticoagulation. The aim of this study was to investigate the occurrence and predicting factors for episodes with very high (≥9) international normalized ratio (INR) values in warfarin treated patients with atrial fibrillation (AF).

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Background/objectives: Optical coherence tomography (OCT) is widely used for evaluation of healing response to stent implantation. We sought to test the agreement between the 1-mm and 0.6-mm sampling intervals for assessment of the percentage of uncovered and malapposed struts by OCT.

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