Abstract

Central Illustration

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INTRODUCTION

Postural orthostatic tachycardia syndrome (POTS) is the most prevalent chronic cardiovascular dysautonomia among young and middle-age individuals, predominantly women. It is characterized by chronic orthostatic intolerance, abnormal heart rate (HR) increase on standing, and deconditioning (1,2) (Table 1). The syndrome has been postulated to have post-viral autoimmune activation as a possible etiology (3).

In the acute phase, coronavirus disease-2019 (COVID-19) causes multiple complications including pneumonia, respiratory distress syndrome, liver injury, cardiac injury, and prothrombotic coagulopathy. Long-term consequences remain unknown (4). Recently, chronic (“long-haul”) symptoms following COVID-19 infections have been consistent with a POTS-like presentation (4). Here we present a series of 3 patients with chronic post-COVID-19 symptoms diagnosed as POTS.

Patient #1

In March 2020, a 42-year-old woman with history of allergic rhinitis and conjunctivitis developed flu-like symptoms including malaise, cough, fever, weakness, loss of appetite, myalgia, and loss of smell and taste. She did not seek medical attention and her condition improved progressively but, in May, symptoms recurred with the addition of abdominal pain and odynophagia. Chest computed tomography and laboratory testing were normal. A nasopharyngeal swab showed no evidence of COVID-19.

In July, debilitating symptoms of profound exhaustion with associated sinus tachycardia followed. Telemetry showed HR of 70 to 160 beats/min. Echocardiography was normal. Serology tests for severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2) were considered borderline. By September, she was found unable to stand more than 5 min. Additionally, she complained of palpitations, dizziness, heat, and exercise intolerance (Figure 1). During a head-up tilt test, her HR increased from 85 beats/min supine to 135 beats/min upright within 10 min (Figure 2). Active standing showed initial orthostatic hypotension (Figure 3), whereas Valsalva maneuver showed a hyperadrenergic response characteristic for POTS (Figure 4).

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Figure 1

POTS Symptom Scoring in 42-Year-Old Woman

Patient #1 self-reported symptoms using a dedicated postural orthostatic tachycardia syndrome (POTS) symptom scoring questionnaire composed of 12 most commonly reported symptoms in POTS. Patients were asked to grade their symptoms using a visual analogue scale (VAS) ranging from 0 (no symptom) to 10 (worst possible). The maximum score is 120 points. A score >40 points likely indicates pathology.

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Figure 2

HUT Testing in 42-Year-Old Woman

Head-up tilt (HUT) test revealing post–coronavirus disease-2019 POTS in a 42-year-old woman (Patient #1), with red arrows indicating the marked increase in heart rate (HR) during orthostasis. bpm = beats/min; Diz = dizziness; POTS = postural orthostatic tachycardia syndrome.

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Figure 3

Active Standing in 42-Year-Old Woman

Active standing test demonstrating initial orthostatic hypotension and POTS in a 42-year-old woman (Patient #1) with long-haul post–coronavirus disease-2019 symptoms, with red arrow indicating the marked increase in heart rate during orthostasis. Abbreviations as in Figures 1 and​and22.

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Figure 4

Valsalva Response in 42-Year-Old Woman

Hyperadrenergic Valsalva maneuver in a 42-year-old woman (Patient #1) with long-haul post–coronavirus disease 2019 symptoms, with red arrows indicating the marked increase in heart rate and blood pressure (hyperadrenergic response). Abbreviations as in Figure 2.

Ambulatory monitoring demonstrated a mean HR of 89 beats/min with episodic sinus tachycardia, maximum rate of 153 beats/min, while standing. Spirometry and cardiac magnetic resonance were normal. Autoimmunological screening of antiphospholipid antibodies, antinuclear antibodies, antineutrophil cytoplasmic antibody was normal. Twenty-four–hour blood pressure (BP) monitoring showed average BP of 112/74 mm Hg, preserved circadian profile, and lowest BP during daytime of 79/46 mm Hg.

Nonpharmacological measures including increased fluid intake, compression stockings, and avoidance of orthostatic triggers were recommended. She did not tolerate beta-blockers due to worsened orthostatic intolerance, and ivabradine 7.5 mg twice a day was started (Table 2) with substantial improvement, although the patient remains on sick leave.

Patient #2

A 28-year-old woman developed COVID-19 symptoms in May 2020 with fever, dyspnea, chest pain, lightheadedness, and headache. Polymerase chain reaction testing was positive for SARS-CoV-2. Previous medical history included arthroscopic meniscectomy, tonsillectomy, and discectomy.

Due to persistent and progressive symptoms (chest pain, fatigue, vertigo, headache), she was hospitalized twice. Blood tests were normal except slight leukocytosis. Chest computed tomography excluded pulmonary embolism and viral pneumonia but revealed pericardial effusion. As pericarditis was suspected, prednisolone was started, and subsequently changed to colchicine and ibuprofen, with no effect on symptoms. Due to headache, nausea, and photophobia, viral meningitis was suspected. However, lumbar puncture and spine and brain magnetic resonance imaging scan were normal.

An active standing test demonstrated HR increase from 75 to 128 beats/min with concomitant slight increase in systolic BP (10 mm Hg) and pronounced orthostatic intolerance (dizziness, lightheadedness, tremor) (Figure 5).

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Figure 5

POTS Symptom Scoring in 28-Year-Old Woman

Patient #2 self-reported symptoms using a dedicated POTS symptom scoring questionnaire composed of 12 most commonly reported symptoms in POTS. Patients were asked to grade their symptoms using a VAS ranging from 0 (no symptom) to 10 (worst possible). The maximum score is 120 points. A score >40 points likely indicates pathology. Abbreviations as in Figure 1.

In September, she was referred to a tertiary center for post–COVID-19 follow-up and tested positive for SARS-CoV-2 immunoglobulin G antibodies. During a 6-min walking test peripheral oxygen desaturation was noted (from 99% to 89%) without any other findings.

Further evaluation with perfusion stress cardiac magnetic resonance, antinuclear antibodies, antineutrophil cytoplasmic antibody, metoxycatecholamines, and antiphospholipid autoantibodies was normal. POTS was confirmed by both active standing test and head-up tilt (symptomatic sinus tachycardia >130 beats/min).

Nonpharmacological recommendations included increased daily fluid and salt intake, as well as use of compression socks. She was prescribed propranolol 10 mg ×3 times a day (Table 2). After several weeks, she developed gastrointestinal symptoms, itching, and orbital edema. Because concomitant mast cell activation syndrome was suspected, she received H1 and H2 antihistamines but remains highly symptomatic and is on sick leave.

Patient #3

In May 2020, a 37-year-old man developed sore throat, fever, fatigue, muscle weakness, dry cough, and palpitations. He had a history of childhood sepsis and migraine. Polymerase chain reaction testing for SARS-CoV-2 and antibodies was negative on multiple occasions. Although not initially hospitalized, the patient was later admitted twice during the summer due to severe and persistent symptoms of extreme fatigue, muscle weakness, insomnia, palpitations, and “brain fog” with trouble concentrating.

A chest computed tomography revealed no signs of viral pneumonia. Myositis and neurological complications were initially suspected; however, the full-body magnetic resonance imaging (including brain and neck) was normal. Lumbar puncture, echocardiography, and laboratory work-up were normal. Skeletal muscle biopsy revealed minimal enrichment of inflammatory cells with unclear significance. Marked fluctuations in sinus rate (periodic increases >140 beats/min with minimal effort) were noted on telemetry. An active standing test demonstrated increase in sinus rate from 98 to 142 beats/min, whereas BP remained stable. POTS was confirmed.

He was referred to a tertiary center for post–COVID-19 follow-up. Additional tests were negative for antinuclear antibodies, antineutrophil cytoplasmic antibody, and metoxycatecholamines. Anticardiolipin and anti-beta-2-glycoprotein-2 immunoglobulin M were slightly elevated (9 E/ml, with values >30 diagnostic for antiphospholipid syndrome).

Recommendations were given to increase fluid and salt intake and use compression socks (Table 2). The patient received propranolol 10 mg ×3 times a day and pyridostigmine 10 mg ×3, the latter due to severe fatigue and muscle weakness. In addition to typical POTS symptoms he developed nausea, orbital edema, and gastrointestinal symptoms (Figure 6). Empirical treatment with H1 and H2 antihistamines was initiated due to suspected mast cell activation syndrome, with moderate clinical improvement. Despite up-titration of propranolol and pyridostigmine, he is still highly symptomatic and on sick leave.

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Figure 6

POTS Symptom Scoring in 37-Year-Old Man

Patient #3 self-reported symptoms using a dedicated POTS symptom scoring questionnaire composed of 12 most commonly reported symptoms in POTS. Patients were asked to grade their symptoms using a VAS ranging from 0 (no symptom) to 10 (worst possible). The maximum score is 120 points. A score >40 points likely indicates pathology. Abbreviations as in Figure 1.

Discussion

We describe 3 Swedish patients diagnosed with POTS-like symptoms following probable COVID-19 infections. Patients were diagnosed on the grounds of characteristic orthostatic tachycardia and chronic symptoms of orthostatic intolerance after exclusion of competing etiologies (Table 1).

POTS affects primarily women (≈80%) and is manifested by orthostatic tachycardia, in association with various symptoms including palpitations, dizziness, headache, fatigue, and blurred vision (1,2) (Table 3). The syndrome can be precipitated by viral illness or severe infection (5) in 30% to 50% of all patients. The mechanism of POTS is generally undetermined. Similarly, the mechanism of post–COVID-19 POTS remains unknown, although a chronic inflammatory or autoimmune response may be at play. Whereas few reports have been published (6,7), the number of patients affected by long-haul post–COVID-19 will likely grow.

Negative SARS-CoV-2 test results do not exclude SARS-CoV-2 infection and ought to be interpreted with caution in the context of typical symptoms (8). In the differential diagnosis of POTS, it is important to consider and exclude other identifiable causes of sinus tachycardia such as dehydration, other infections, hyperthyroidism, cardiac disease, anxiety, anemia, metabolic disorders, chronic fatigue syndrome, or deconditioning (5) (Table 1).

Available management protocols for POTS (Table 2) aim at increasing intake of fluids (water) and salt, physical countermaneuvers, and individually adapted aerobic exercise in recumbent position (1,5,9) to help correct the physiological abnormalities. Pharmacotherapy includes volume expanders, vasoconstrictors, and HR regulators but patients may remain symptomatic and incapable of work.

Much remains unknown about the specific mechanisms responsible for the POTS-like symptoms in post–COVID-19 patients or how long these symptoms will last but chronic symptoms are expected in a subset of patients based on this initial clinical experience.

Funding Support and Author Disclosures

The authors have reported that they have no relationships relevant to the contents of this paper to disclose.

Footnotes

References