Patent foramen ovale (PFO), an embryonic remnant of the fetal circulation, is present in 20-25% of adults. Although recent observational studies and clinical trials have established the link between PFO-mediated right-to-left shunting with cryptogenic stroke and migraine with aura, the role of a PFO in exacerbating hypoxemic medical conditions (ie, sleep apnea, chronic obstructive pulmonary disease, pulmonary hypertension, platypnea-orthodeoxia, pulmonary arteriovenous malformation, high-altitude pulmonary edema, and exercise desaturation) remains less understood. PFO-mediated hypoxemia occurs when deoxygenated venous blood from the right atrium enters and mixes with oxygenated arterial blood in the left atrium. Patients with an intracardiac right-to-left shunt may have profound hypoxemia out of proportion to underlying primary lung disease, even in the presence of normal right-sided pressures. The presence of right-to-left cardiac shunting can exacerbate the degree of hypoxemia in patients with underlying pulmonary disorders. In a subset of these patients, percutaneous PFO closure may result in marked improvement in dyspnea and hypoxemia. This review discusses the association between PFO-mediated right-to-left shunting with medical conditions associated with hypoxemia and explores the role of percutaneous PFO closure in alleviating the hypoxemia.

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Background When patients present to the emergency department with a complaint concerning for heart disease, this often becomes the primary focus of their evaluation. While patients with noncardiac causes of chest pain outnumber those with cardiac causes, noncardiac etiologies are frequently overlooked. We investigated symptoms and noncardiac conditions in a cohort of patients with chest pain at low risk of cardiac disease. Methods We analyzed data from a prospective registry of patients who were evaluated in our chest pain evaluation center. Registry participants completed standardized and validated instruments for depression (by Patient Health Questionnaire PHQ-9), anxiety (by Generalized Anxiety Disorder GAD-7), and Gastroesophageal Reflux Disorder (GERD; by GERD Symptom Frequency Questionnaire). Chest pain characteristics were recorded; severity was reported on a 10-point scale. Results A total of 195 patients were included in the investigation. Using the instruments noted above, the prevalence of depression was 34%, anxiety was 30%, and GERD was 44%, each of at least moderate severity. 32.5% of patients had 2 or more conditions. The median for the severity of angina was 7/10 and the number of episodes over the preceding week was 2, respectively. Severity of angina was associated with PHQ-9 (r = 0.238; P < 0.001) and GAD-7 (r = 0.283; P < 0.001) scores. The number of angina episodes over the prior week correlated with GERD Symptom Frequency Questionnaire (r = 0.256; P < 0.001) and PHQ-9 (r = 0.175; P = 0.019) scores. No correlation was observed between any of the scores and body mass index, smoking tobacco, diabetes mellitus, hypertension, or hyperlipidemia. Conclusion In our cohort of low-risk acute chest pain patients, depression, anxiety, and GERD were common, substantial overlap was observed. The severity of these noncardiac causes of chest pain causes correlated with the self-reported severity and frequency of angina, but weakly. These conditions should be part of a comprehensive plan of care for chest pain management.