Aleksandr Korniyenko

Toxic Effects of Marijuana on the Cardiovascular System

We present a case of marijuana-induced ST segment elevation mimicking Brugada syndrome in a young man. Cannabis can have a multitude of effects on the different organ systems of the body; we take a closer look at its effects on the cardiovascular system, including acute coronary syndrome, arrhythmias and congestive heart failure.

'Chasing the dragon': new knowledge for an old practice.

Heroin administration by “chasing the dragon,” whereby the user places freebase heroin on aluminum foil, heats it below with a flame, and inhales the pyrolysate through a straw, can be associated with the rare development of a delayed-onset spongiform leukoencephalopathy. We report the case of a 46-year-old woman with a psychiatric diagnosis of depression and heroin dependence by “chasing the dragon” admitted with features of altered mental status and later development of catatonia, abulia, and akinetic mutism. A brain magnetic resonance image evidenced bilateral symmetric high-signal lesions in the white matter of the cerebrum and cerebellum on T2-weighted images compatible with toxic leukoencephalopathy. The patients condition resolved after a hospital stay of 2 months with supportive treatment. Acute onset of neurobehavioral changes, including confusion, apathy, and cerebellar signs in a person with exposure to heroin, should prompt one to consider toxic leukoencephalopathy as a cause of presentation.

Infectious atherosclerosis: Is the hypothesis still alive? A clinically based approach to the dilemma

Among the multiple factors involved in the pathophysiology of heart disease, infections have been proposed to play a role in atherosclerosis with most of the available evidence implicating Chlamydia pneumonia, influenza virus and Mycoplasma pneumoniae. Based on a model case presentation, we speculate that in the absence of traditional risk factors and in the context of an ongoing respiratory infection caused by a pro-inflammatory pathogen (M. pneumoniae) along with a past positive serologic history for potentially proven atherogenic microorganism (C. pneumoniae) and infection may elicit potentially pathogenic events on vascular wall cells and leukocytes of atheromatous lesions, supporting the hypothesis that such infections may potentiate atherosclerotic cardiovascular disease (CVD).

A Bridge to a Woman's Heart as the Cause of Recurrent Chest Pain: A Case on Myocardial Bridge.

Myocardial bridge is a congenital structural variant of the coronary arteries where a segment of the epicardial vessel is surrounded by the myocardium. It is an uncommon entity that may go unnoticed in patients with recurrent chest pain. We present a case on a 36-year-old woman with recurrent chest pain. Initial workup revealed normal routine laboratory test results, cardiac biomarkers, electrocardiogram, and an echocardiogram showing preserved ejection fraction with no valvulopathies. A dobutamine myocardial perfusion stress test was performed; this induced chest pain in the patient with electrocardiogram changes evident for 1-mm ST segment elevation in lead V5 and V6 consistent with myocardial ischemia. Perfusion imaging revealed a small fixed myocardial perfusion defect of the apical inferior wall. A cardiac catheterization revealed moderate-to-severe myocardial bridging involving the middle left anterior descending artery. Treatment with metoprolol and ranolazine resolved her symptoms. This case portrays the importance of recognizing myocardial bridge as the potential cause of recurrent chest pain and its ability to cause myocardial ischemia under stress.

Bilateral Bochdalek Hernias Presenting as Respiratory Failure in an Elderly Patient

Bochdalek hernia occurs from a congenital defect of the diaphragm, allowing the passage of abdominal structures into the thoracic cavity, limiting lung expansion and ventilatory function. Bochdalek hernia is common in neonates but rarely occur in adults; there are only 4 documented cases in the elderly population. We present a case of an 88-year-old woman with severe hypoxia and respiratory failure that required ventilatory support, in whom bilateral Bochdalek hernias progressed over the years and severely invaded the thoracic cavity, causing acute decompensation. This is a rare condition in adults but can cause substantial morbidity when the involvement of the thoracic cavity is severe.

Mild hyperkalemia and low eGFR a tedious recipe for cardiac disaster in the elderly: an unusual reversible cause of syncope and heart block

Hyperkalemia affects the myocardial tissue producing electrocardiographic abnormalities, such as prolongation of the P-R interval, tall peaked T waves, a reduction in the amplitude and an increase in the duration of P wave, and atrial and ventricular arrhythmias, including variable degree heart blocks. Elderly patients are particularly predisposed to developing hyperkalemia and the associated abnormalities due to an age-related reduction in glomerular filtration rate and pre-existing medical problems. Therefore, the impact of aging on potassium homeostasis must be taken into consideration, and preventive measures, such as early recognition of possible hyperkalemia in the geriatric population treated with certain medications or supplements must be investigated. The threshold for cardiac arrhythmias in the elderly can be lower than the general population. We report 3 unusual cases of mild hyperkalemia in elderly patients presenting with hypotension, syncope and variable degree heart blocks which resolved spontaneously with the correction of hyperkalemia.