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Case report.

* THE PATIENT

An active, 46-year-old man

* SIGNS a SYMPTOMS

--Right-sided visual toss

--No family history of stroke

* THE CASE

A 46-year-old man presented to the emergency department (ED) with sudden-onset right-sided visual loss. He had a history of asthma, but no family history of hypercoagulability, deep vein thrombosis (DVT), or stroke. The patient had an active lifestyle that included scuba diving, mountain biking, and hockey (coaching and playing). The physical examination revealed a right homonymous upper quadrantanopia. The neurologic examination was within normal limits, except for the visual deficit and unequal pupil size. A computerized tomography scan of the patient's head did not reveal any lesions.

Based on the patient's clinical picture, the ED physician prescribed alteplase, a tissue plasminogen activator (tPA), and admitted him to the intensive care unit for monitoring.

Subsequent magnetic resonance imaging (MRI) of the brain showed multiple small areas of acute infarct in the posterior circulation territory bilaterally, with involvement of small portions of the bilateral cerebellar hemispheres and parts of the left occipital lobe (FIGURE 1A and 1B).

An electrocardiogram showed no evidence of atrial fibrillation, and hypercoagulability studies were within normal limits. There was no evidence of May-Thurner anatomy, and an ultrasound of the lower extremities showed no DVT.

THE DIAGNOSIS

An echocardiogram with bubble study confirmed a diagnosis of patent foramen ovale (PFO) with bidirectional flow, a normal ejection fraction, and no evidence of left ventricular or left atrial thrombus. We started the patient on the anticoagulant enoxaparin 70 mg bid bridged with warfarin 5 mg/d.

Taking the patient's active lifestyle into consideration, he was approved for PFO closure by the PFO committee and underwent closure. Following treatment, the patient was left with a residual 2-mm blind spot in the right visual field. At a 2-year follow-up visit, he showed no new focal deficits or recurrent symptoms.

DISCUSSION

Since 1988 when Lechat et al reported increased incidence of PFO in young stroke patients, (1) many studies have supported the association between PFO and cryptogenic stroke (CS) in young adults. (2) Because it remained controversial as to whether PFO is a risk factor for stroke or transient ischemic attack recurrence, (3) researchers investigated PFO closure as a preventive measure to decrease stroke recurrence in patients with both CS and PFO.

* A 2012 meta-analysis showed possible benefits of closure compared with medical management using antiplatelet or anticoagulation therapies. (4) However, these results were not supported by results of other studies. These include the CLOSURE I trial, (5) which compared device closure of PFO with medical therapy, and the RESPECT (6) and PC trials, (7) which did not show a significant difference in the primary end point of recurrent stroke between patients who received medical therapy and those who had PFO closure.

American Heart Association/American Stroke Association's 2011 guidelines recommend only antiplatelet therapy for patients with CS and PFO. (8) While there is consensus that surgical closure is not better than a medical approach to patients with CS and PFO, cases should be individualized, as a patient's clinical or social factors may dictate otherwise.

Lifestyle may warrant PFO closure

No previous studies have considered occupation or hobbies as an indication for PFO closure in patients with CS. Our patient's active lifestyle, particularly his scuba diving and participation in contact sports, made him a poor candidate for anticoagulation. Scuba diving is associated with decompression sickness and air emboli, which can be a mechanism of cerebral ischemia, especially in patients with a right-to-left shunt, such as with PFO. (9)

We did not observe a strong temporal relationship between diving and stroke in our patient. MRI findings suggested that he had multiple minor embolic events over time, which is consistent with a prior case report. (9) This suggested air emboli as a possible source of stroke, in which case, our patient might not benefit from antiplatelet or anticoagulation therapy.

THE TAKEAWAY

This case illustrates the importance of a thorough social history and knowledge of the patient's hobbies, occupation, and preferences in evaluating and treating individuals with CS associated with PFO. The current literature does not provide complete answers to the cause, diagnosis, and management of CS; additional research is needed.

The work-up involved in defining the etiology of stroke includes, but is not limited to, head and brain imaging, an echocardiogram, hypercoagulability tests, and vascular imaging. The work of Sanna et al showed that approximately 12% of patients with CS have atrial fibrillation when monitored over a one-year period, suggesting atrial fibrillation as a possible cause in some cases. (10)

As the case described here demonstrates, further research is warranted regarding how a patient's occupation and lifestyle factor into decision-making for patients with PFO.

Tokunbo Ajayi, MD; Hyun-Sik Yang, MD; Ashmeet Bhatia, MD

North Shore Medical Center Salem Hospital, Salem, Mass (Drs. Ajayi, Yang, Bhatia); Department of Internal Medicine, Howard County General Hospital, Columbia, Md (Dr. Ajayi); Department of Neurology, Massachusetts General Hospital, Division of Cognitive and Behavioral Neurology, Brigham and Women's Hospital, Boston, Mass (Dr. Yang); Beth Israel Deaconess Medical Center, Boston, Mass (Dr. Bhatia)

toksyajayi@yahoo.com

The authors reported no potential conflict of interest relevant to this article.

References

(1.) Lechat P, Mas JL, Lascault G, et al. Prevalence of patent foramen ovale in patients with stroke. N Engl J Med. 1988;318: 1148-1152.

(2.) Ferro JM, Massaro AR, Mas JL. Aetiological diagnosis of ischaemic stroke in young adults. Lancet Neurol. 2010;9:1085-1096.

(3.) Cotter PE, Belham M, Martin PJ. Stroke in younger patients: the heart of the matter. J Neurol. 2010;257:1777-1787.

(4.) Kitsios GD, Dahabreh IJ, Abu Dabrh AM, et al. Patent foramen ovale closure and medical treatments for secondary stroke prevention: a systematic review of observational and randomized evidence. Stroke. 2012;43:422-431.

(5.) Furlan A J, Reisman M, Massaro J, et al. Closure or medical therapy for cryptogenic stroke with patent foramen ovale. N Engl J Med. 2012;366:991-999.

(6.) Carroll JD, Saver JL, Thaler DE, et al. Closure of patent foramen ovale versus medical therapy after cryptogenic stroke. N Engl J Med. 2013;368:1092-1100.

(7.) Meier B, Kalesan B, Mattle HP, et al. Percutaneous closure of patent foramen ovale in cryptogenic embolism. N Engl J Med. 2013;368:1083-1091.

(8.) Furie KL, Kasner SE, Adams RJ, et al. Guidelines for the prevention of stroke in patients with stroke or transient ischemic attack: a guideline for healthcare professionals from the American Heart Association/American Stroke Association. Stroke. 2011;42: 227-276.

(9.) Menkin M, Schwartzman RJ. Cerebral air embolism. Report of five cases and review of the literature. Arch Neurol. 1977;34: 168-170.

(10.) Sanna T, Diener HC, Passman RS, et al. Cryptogenic stroke and underlying atrial fibrillation. N Engl J Med. 2014;370: 2478-2486.

Caption: FIGURE 1 MRIs reveal area of infarct

An axial diffusion-weighted magnetic resonance imaging (MRI) scan (FIGURE 1A) shows restricted diffusion and a left occipital acute infarct.

A corresponding fluid attenuated inversion recovery (FLAIR) image (FIGURE 1B) shows an abnormal parenchymal signal and hyperintensity in the left occipital lobe, which is the area of the stroke.
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Author:Ajayi, Tokunbo; Yang, Hyun-Sik; Bhatia, Ashmeet
Publication:Journal of Family Practice
Date:Aug 1, 2017
Words:1175
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