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Cardiac Platypnea-Orthodeoxia Syndrome in a 73-Year-Old Woman

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Cardiac Platypnea-Orthodeoxia Syndrome in a 73-Year-Old Woman CMAJ Practice CME Cases Cardiac platypnea-orthodeoxia syndrome in a 73-year-old woman Khai-Jing Ng MD, Yi-Da Li MD 73-year-old woman was admitted and aorta were 99.7%, 85.5% and 88.6%, Competing interests: None because of progressive shortness of respectively, which is compatible with the pres- declared. A breath over the previous two weeks, ence of intracardiac right-to-left shunt through a This article has been peer which affected her daily activities. She had a patent foramen ovale. We diagnosed platypnea- reviewed. history of congestive heart failure (New York orthodeoxia syndrome. The authors have obtained Heart Association functional class II), hyper- The patient was scheduled for transfer to a patient consent. tension and scoliosis. Her medications included tertiary care centre for further surgical interven- Correspondence to: acetylsalicylic acid, amiloride, hydrochlorothia- tion. Because her oxygen saturation fluctuated Yi-Da Li, zide, atenolol, rosuvastatin and spironolactone. between 80%–90% in the supine position, we [email protected] She had no orthopnea or productive cough. On questioned whether she would be able to tolerate CMAJ 2015. DOI:10.1503 physical examination, her heart sounds were the three-hour journey. Considering the patho- /cmaj.141525 normal, without murmur. An electrocardiogram physiology of platypnea-orthodeoxia syndrome, showed normal sinus rhythm. we attempted to increase left ventricular end- During the patient’s stay in hospital, intermit- diastolic pressure using a vasopressor to improve tent hypoxemia was noted when she was eating right-to-left shunting. We initially used low-dose or sitting upright; hypoxemia improved when the dopamine (5 μg/kg per min). Unfortunately, patient was lying down. Oxygen saturation was tachycardia developed, and the patient’s dyspnea found to step-down gradually, from 90% (when and intermittent desaturation did not improve. the patient was supine) to 78% (45° recline) to The patient also felt chest discomfort from palpi- 69% (90° upright), before recovering to 87% tations. We changed the vasopressor to norepi- (return to supine). nephrine (5 μg/hr), which improved the patient’s A transthoracic echocardiogram showed a condition — her oxygen saturation was greater mildly dilated left atrium with a mildly dilated than 95% when she was in a supine position. aortic root (3.95 cm). No valvular abnormalities, The patient was successfully transferred to pericardial effusion or atrial septal aneurysm the tertiary care hospital, where she underwent were seen. Bubbles were seen in the left atrium implantation of a septal occluder. A follow -up and ventricle within three cardiac cycles on bub- cardiac echocardiogram showed no residual ble echocardiography (Figure 1 and Appendix 1, shunting, and the patient’s dyspnea decreased available at www.cmaj.ca/lookup/suppl/ substantially after closure of the patent foramen doi:10.1503/cmaj.141525/-/DC1), suggesting ovale (Appendix 2, available at www.cmaj.ca/ intracardiac shunting. Computed tomography of lookup/suppl/doi:10.1503/cmaj.141525/-/DC1). the chest showed no evidence of lung parenchy- mal disease or pulmonary embolism; however, Key points scoliosis and a tortuous, dilated aortic root were noted. Right heart catheterization confirmed nor- • Patients with platypnea-orthodeoxia syndrome may present with mal pulmonary pressure (mean pulmonary arte- shortness of breath, as well as hypoxemia when in an upright position. rial pressure 12 mm Hg; mean right atrial pres- • Careful history-taking and physical examination usually reveal the diagnosis. sure 4 mm Hg) and a normal Qp/Qs ratio (0.46). • The treatment of choice for cardiac platypnea-orthodeoxia syndrome is Direct measurement of oxygen saturation during percutaneous closure of the interatrial communication. cardiac catheterization showed a step-down pat- • Vasopressors can be used as a bridge to surgical intervention in tern: peripheral arterial saturation (SPo2) in pul- patients with platypnea-orthodeoxia syndrome. monary capillary wedge position, left ventricle ©2015 8872147 Canada Inc. or its licensors CMAJ, December 8, 2015, 187(18) 1385 Practice Discussion Patent foramen ovale Although patent foramen ovale may be clinically Platypnea-orthodeoxia syndrome is an uncom- silent for decades, patients with this defect may mon clinical syndrome that usually presents with present with cardiac platypnea-orthodeoxia syn- a cardinal symptom (platypnea: dyspnea in an drome. It has been proposed that the intracardiac upright posture relieved by recumbency) and sign communication caused by a patent foramen (orthodeoxia: hypoxemia in an upright position). ovale results in transiently elevated right cham- The exact cause of platypnea-orthodeoxia syn- ber pressure, and the “flow” phenomenon (i.e., drome is not fully understood, possibly because distortion of anatomy favouring passage of blood patients do not present with pulmonary hyperten- to the interatrial communication) may lead to the sion and right chamber pressure is normal.1,2 development of platypnea-orthodeoxia syn- Both anatomic and functional abnormalities must drome.2,4,5 In addition, aortic changes (e.g., elon- be present to cause platypnea-orthodeoxia syn- gation and dilatation) may cause the atrial sep- drome.3 The anatomic component refers to the tum to become horizontal, thereby promoting a presence of any structural defect which allows more direct pathway for blood flow from the interatrial communication, including patent fora- vena cava to the interatrial communication, men ovale, atrial septal defect and fenestrated de spite the absence of a pressure gradient.4,5 atrial septal aneurysm. The functional component Moreover, it has been proposed that an upright refers to any condition that may cause an atrial position could stretch the interatrial communica- septum deformity, leading to intracardiac shunt- tion, allowing more streaming of venous blood ing while the patient is in the upright position.3 from the inferior vena cava through the defect.3 We speculate that the development of the sub- stantial intracardiac shunt in our patient’s case Investigations was likely the result of dilatation of the ascending A noninvasive workup including serial oxygen aorta and kyphoscoliosis, which has been saturation measurements with standard pulse reported to cause abnormal orientation of the oximetry and echocardiography are usually suffi- heart (Figure 2).4 cient to establish the diagnosis of platypnea- orthodeoxia syndrome. Contrast transthoracic echocardiography helps to detect the presence of a right-to-left shunt, whereas transesophageal echocardiography is better for assessing atrial anatomy.6 The gold standard diagnostic test for platypnea-orthodeoxia syndrome remains car- diac catheterization with oxygen measurement directly in the left atrium.6,7 Management The definitive treatment for cardiac platypnea- orthodeoxia syndrome is percutaneous closure of the interatrial communication, which appears to be safe and efficient, with a low rate of compli- cation.6,8 Other possible diagnoses, such as pul- monary hypertension, should be excluded before closure of the defect to avoid clinical deteriora- tion of the patient’s condition after correction of right-to-left-shunt. In our patient’s case, we were concerned about the effects of a three-hour journey and reviewed the literature for possible pharmaco- logical interventions to use as a bridge to sur- gery. However, we found little information. Only one case reported the use of a potent α-adrenergic agonist (metaraminol) to reverse the intracardiac shunt by causing a sharp rise of left ventricular end-diastolic pressure and left Figure 1: Bubble echocardiogram from a 73-year-old woman with progressive 9 shortness of breath. Bubbles (asterisk) were seen in the left atrium (LA) atrial pressure in occult atrial septal defect. and left ventricle (LV) within three cardiac cycles. We diagnosed platypnea - We attempted to increase left ventricular end orthodeoxia syndrome. diastolic pressure using vasopressors, including 1386 CMAJ, December 8, 2015, 187(18) Practice dopamine and norepinephrine, to temporarily causing peripheral vasodilation.10 At higher reverse the intracardiac shunting. Norepineph- doses (> 10 μg/kg per min), dopamine activates rine is a strong α-receptor agonist and a weak α receptors, leading to systemic and pulmonary 10 β1-adrenergic agonist, thus producing a dose- vasoconstriction. However, varying serum dependent systemic vascular resistance and mod- drug concentrations can result when dopamine est increase in cardiac output (Figure 3). is administered by weight in various patients.11 In contrast, dopamine is a dose-dependent Norepinephrine successfully reversed the intra- vasopressor that has various hemodynamic cardiac shunting in our patient; this effect was effects. At low doses (< 3 μg/kg per min), dopa- probably due to a more selective action of norepi- mine increases blood flow in renal and splanch- nephrine on peripheral vasoconstriction (Figure 3). nic regions.10 At moderate doses (3–10 μg/kg The moderate dose of dopamine we used likely per min), it stimulates β receptors, increasing caused sinus tachycardia or tachyarrhythmia in our myocardial contractility and heart rate while patient, which lead to her chest discomfort. A B Figure 2: Computed tomography showing the angle between the interatrial septum (solid line) and the sagittal axis (dotted line). The angle in our patient’s case measured 54.2° (A), whereas 25.4° is considered normal
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