Dr. Adelena Izold, ND

A systems-based framework addressing autonomic dysfunction, gut–brain signaling, endocrine balance, and metabolic resilience in post-viral dysautonomia.

This case report describes the integrative management of a 36-year-old female with post-viral POTS following COVID-19 exposure. Through longitudinal assessment targeting autonomic regulation, gut microbiome balance, electrolyte repletion, and HPA axis resilience, the patient experienced sustained improvements in symptom severity, functional stability, and quality of life over a two-year follow-up period.

Abstract

• Background: POTS prevalence and post-viral association, including post–COVID-19. 
• Case Presentation: Female patient (36-year-old) with orthostatic intolerance following COVID exposure. 
• Intervention: Integrative, multi-modal approach.
• Outcomes: Symptom and functional improvement. 
• Conclusion: Clinical implications for integrative care.
  

Introduction

Postural orthostatic tachycardia syndrome (POTS) is a form of autonomic nervous system dysfunction characterized by excessive heart rate increase upon standing, often accompanied by dizziness, fatigue, palpitations, exercise intolerance, and cognitive impairment. Diagnostic criteria typically include a sustained increase in heart rate of ≥30 beats per minute (≥40 in adolescents) within 10 minutes of standing in the absence of orthostatic hypotension. Although previously considered uncommon, recognition of POTS has increased substantially over the past decade.

Epidemiologic data indicate a marked female predominance, with approximately 75–85% of cases occurring in women of reproductive age. Many patients report symptom onset following a
physiologic stressor, including viral illness, surgery, trauma, or significant psychosocial stress.
Increasing literature has identified associations between POTS and post-viral syndromes, including cases following SARS-CoV-2 infection. Similar symptom clusters have also been reported following COVID-19 vaccination in a small subset of individuals, although mechanisms remain under investigation. Proposed pathophysiologic contributors include immune dysregulation, small fiber neuropathy, hypovolemia, mast cell activation, and altered autonomic signaling.

Conventional management focuses primarily on symptom mitigation through fluid and salt loading, compression garments, graded exercise therapy, and pharmacologic agents such as beta-blockers, fludrocortisone, midodrine, or ivabradine. While these strategies may reduce symptom severity, many patients continue to experience persistent functional impairment and require long-term multi-drug regimens.

Given the multifactorial nature of POTS and its frequent association with immune, endocrine,
and metabolic disturbances, a systems-based, integrative approach may offer additional therapeutic benefit. Functional assessment of adrenal reserve, thyroid conversion, micronutrient status, and gastrointestinal integrity may help identify modifiable contributors to autonomic instability.

The following case describes longitudinal outcomes in a female patient with POTS managed using a comprehensive integrative framework targeting these interconnected physiologic domains.

Case Presentation

Patient Information
The subject was a female patient, age 36. Relevant background factors included a history of prior COVID-19 exposure through natural infection and vaccination in 2019, which temporally preceded the onset of symptoms. No additional personal or family history was identified that independently explained the clinical presentation.

Presenting Concern
The patient presented with symptoms consistent with orthostatic intolerance, including positional
tachycardia, fatigue, lightheadedness, exercise intolerance, and cognitive complaints. Symptoms had persisted for several months and resulted in a measurable decline in daily functioning and quality of life.

Clinical History and Context
Symptom onset occurred following COVID-19 exposure, with progressive worsening over time.
Prior evaluations included conventional cardiopulmonary assessment, which did not identify
structural heart disease or alternative primary cardiopulmonary pathology. Standard management strategies provided limited or transient benefit, prompting pursuit of an integrative evaluation focused on autonomic regulation, metabolic resilience, and post-viral physiologic stress. The patient was followed longitudinally over a two-year period, with reassessments every 3–6 months to evaluate physiologic trends and guide care modifications.

Clinical Findings
Orthostatic vital sign assessment demonstrated positional tachycardia consistent with autonomic
dysfunction. Physical examination was otherwise unremarkable, with no findings suggestive of
acute infection, primary endocrine disease, or structural cardiovascular abnormality.

Diagnostic Assessment
Baseline laboratory evaluation included comprehensive blood testing, stool analysis with parasitology (three samples), and urinary hormone assessment (DUTCH Complete).

Blood testing revealed white blood cell counts higher than optimal (>6.0 ×10⁹/L), elevated fasting glucose (>95 mg/dL), low potassium (<3.5 mmol/L), suboptimal red blood cell magnesium (<4.4 mg/dL), and elevated reverse triiodothyronine (reverse T3 >15 ng/dL). These findings suggested immune activation, metabolic stress, electrolyte imbalance, and altered thyroid hormone
conversion.

Comprehensive stool analysis demonstrated reduced populations of Bifidobacterium and Lactobacillus, with relative overrepresentation of Clostridium species, Bacteroides, and Escherichia coli within the commensal flora category. Multiple commensal organisms were present at higher than-optimal concentrations, many within gram-negative bacterial groups. Moderate microscopic yeast was observed. Inflammatory and immune markers revealed elevated lysozyme and decreased secretory immunoglobulin A (sIgA). Stool pH was acidic, and short-chain fatty acid production was reduced.

Urinary hormone testing demonstrated increased conversion of cortisol to cortisone, rapid cortisol metabolism, low dehydroepiandrosterone sulfate (DHEA-S), and reduced methylation capacity. These assessments were repeated at 3–6-month intervals over a two-year period to monitor trends and guide individualized care adjustments.

Clinical Assessment

The working diagnosis was postural orthostatic tachycardia syndrome (POTS), based on clinical presentation and exclusion of alternative etiologies. Differential considerations included primary thyroid disease, anemia, medication effects, deconditioning, and anxiety-related tachycardia, none of which sufficiently accounted for the symptom pattern.

Laboratory findings were interpreted within a functional framework, suggesting chronic physiological stress characterized by post-viral immune activation, metabolic strain, gut ecological imbalance, and HPA axis dysregulation. Elevated inflammatory markers and impaired glycemic regulation were considered contributory to sympathetic nervous system activation. Electrolyte and micronutrient insufficiencies were viewed as potential contributors to vascular tone instability and neuromuscular excitability.

Gut findings were interpreted as reflective of microbial imbalance, increased gram-negative antigen burden, mucosal immune activation, and impaired immune defense, with potential downstream effects on systemic inflammation and autonomic signaling via the gut–brain axis.

Endocrine findings suggested reduced cortisol bioavailability, diminished adrenal reserve, and limited adaptive capacity in response to chronic stress. Reduced methylation capacity was  considered relevant to neurotransmitter metabolism and autonomic regulation.

Taken together, these findings supported a clinical model in which post-viral immune burden, gut-mediated inflammatory signaling, and HPA axis strain contributed to sustained autonomic instability.

Therapeutic Intervention

Therapeutic interventions were implemented in a stepwise, individualized manner and adjusted over time based on clinical response and serial reassessment findings. The overarching goals were to improve autonomic stability, reduce physiologic stress burden, restore gut ecology and mucosal immunity, and support HPA axis resilience.

Foundational Lifestyle Strategies

Initial interventions emphasized foundational lifestyle support. The patient was counseled to maintain consistent hydration with the addition of mineral support to daily water intake. Emphasis was placed on whole-food sources rich in magnesium, calcium, and potassium to support vascular tone, neuromuscular function, and cardiac conduction. An adrenal-supportive hydration strategy (“adrenal cocktail”) was incorporated, consisting of coconut water, a small amount of unrefined sea salt, and fresh lemon juice, used regularly to support fluid balance and electrolyte repletion.

Activity pacing strategies were implemented to reduce symptom flares, alongside the use of compression garments when tolerated. Education focused on recognizing early signs of orthostatic stress and modifying activity accordingly.

Gut-Directed Therapies

Gut-directed interventions were introduced sequentially. Initial focus was placed on repletion of beneficial flora through targeted probiotic supplementation, selected to support microbial diversity and mucosal immune balance. To address low sIgA and impaired mucosal defense, serum-derived immunoglobulins were incorporated.

Antifungal strategies were then implemented through a combination of dietary modification and targeted supplementation to address the presence of moderate yeast. Subsequent interventions addressed commensal microbial overgrowth patterns, several of which demonstrated an upper respiratory and oral-perioral association. Food-grade hydrogen peroxide oral rinses were used as part of this phase. Final stages of gut support emphasized restoration of intestinal barrier integrity and optimization of nutrient absorption.

Adrenal and HPA Axis Support

Circadian rhythm optimization formed the foundation of HPA axis support. Patients were counseled on morning light exposure, grounding practices, gentle morning movement, and consistent sleep hygiene, including minimizing evening screen exposure and electromagnetic stimulation.

Mineral support was emphasized through rotational use of magnesium malate, selected for vascular and neuromuscular support, and magnesium L-threonate to support central nervous system relaxation. During the initial three months of care, interventions prioritized calming and stabilizing the stress response using adaptogenic botanicals. As tolerance and resilience improved, adrenal support was advanced using glandular-based therapies to support adrenal reserve.

Nervous System Regulation and Medication Coordination

Nervous system regulation strategies included collaborative care with functional chiropractic
neurologists to support structural integrity and autonomic nervous system recalibration. Anxiolytic herbal formulations were used as needed to support symptom flares.

Medication coordination was addressed when applicable. The patient was perimenopausal, necessitating optimization of hormone replacement therapy when in use. Coordination with cardiology providers was undertaken to support adjustments to blood pressure–modulating medications as autonomic function and volume status improved. Overall, care emphasized a comprehensive, integrative approach tailored to the complex, multifactorial nature of post-viral POTS.

Follow-up and Outcomes

The patient was followed longitudinally over a two-year period with in-office reassessments every 3–6 months and ongoing email support between visits. Over time, the most notable clinical improvement was a reduction in the frequency and severity of POTS episodes. While episodes of orthostatic intolerance were not universally eliminated, the patient consistently reported improved ability to recognize early symptoms and implement grounding, hydration, and pacing strategies to mitigate symptom escalation.

By approximately six months of care, the patient reported improved blood pressure stability, reduced lightheadedness with positional changes, and improved tolerance for daily activities. Improvements in gastrointestinal function were also commonly reported, including more regular
bowel movements and reduced digestive discomfort, consistent with interventions targeting gut
ecology and absorption.

By twelve months and beyond, the patient frequently described improved overall stamina, increased motivation for physical activity, and reduced baseline fatigue. These changes allowed for gradual re-engagement in movement and exercise without triggering prolonged symptom flares. Improvements in perceived stress resilience and recovery following exertion were also noted.

Progress was not strictly linear. Periods of symptom exacerbation were most commonly associated with unforeseen stressors, including intercurrent infections, antibiotic exposure, and significant psychosocial stress such as family-related challenges. These events often required temporary modification of therapeutic strategies and reinforcement of foundational support. Despite these fluctuations, overall trends across the observation period reflected improved autonomic stability, functional capacity, and quality of life.

Discussion

This case illustrates the potential value of a longitudinal, integrative approach to postural orthostatic tachycardia syndrome (POTS) in midlife females with prior COVID-19 exposure. Rather than targeting isolated symptoms, care was directed toward modifiable physiologic patterns involving autonomic regulation, HPA axis function, gut ecology, immune signaling, and metabolic resilience. Over a two-year observation period, this systems-based strategy was associated with meaningful improvements in symptom burden, functional capacity, and physiological stability.

POTS has been increasingly recognized in association with post-viral syndromes, including
post–COVID-19 conditions. Proposed mechanisms include autonomic nervous system imbalance, immune dysregulation, hypovolemia, altered vascular tone, and impaired stress adaptation. In this case, blood, stool, and urinary hormone assessments revealed patterns consistent with chronic physiological stress, including electrolyte insufficiency, altered thyroid hormone conversion, reduced adrenal reserve, and gut-mediated immune activation. While these findings are not diagnostic in isolation, their convergence provided a clinically actionable framework for individualized care.

Electrolyte and mineral insufficiencies were considered particularly relevant given their role in
vascular tone, cardiac conduction, and neuromuscular excitability. Improvements in potassium
and intracellular magnesium status over time coincided with enhanced blood pressure stability
and reduced orthostatic symptoms. Similarly, downward trends in reverse triiodothyronine (reverse T3) suggested improved metabolic efficiency and reduced stress signaling, aligning with improvements in energy and exercise tolerance.

HPA axis findings demonstrated reduced cortisol bioavailability, rapid cortisol metabolism, and
low DHEA-S, patterns that have been described in chronic stress and post-infectious states. Interventions emphasizing circadian rhythm support, mineral repletion, adaptogenic botanicals, and staged adrenal support were associated with gradual improvements in stress tolerance, sleep quality, and overall resilience. Objective sleep metrics obtained through wearable devices supported patient-reported improvements, although such data should be interpreted cautiously given variability in consumer-grade monitoring tools.

Gut ecological findings highlighted reduced beneficial flora, increased gram-negative commensal burden, impaired mucosal immunity, and reduced short-chain fatty acid production. These patterns are relevant given emerging evidence linking gut-derived immune signaling and autonomic nervous system function through the gut–brain axis. Targeted gut-directed therapies were temporally associated with improved gastrointestinal function, immune stability, and reduced symptom flares, supporting the plausibility of gut-mediated contributions to autonomic dysfunction.

An important observation in this case was the nonlinear nature of recovery. Symptom exacerbations frequently followed additional infections, antibiotic exposure, or significant psychosocial stressors, underscoring the vulnerability of autonomic and stress-response systems in this population. Ongoing support, reassessment, and reinforcement of foundational strategies were critical in maintaining forward progress. Importantly, the patient developed increased self-efficacy and symptom management skills, reducing the functional impact of episodic flares even when symptoms were not fully eliminated.

Several limitations should be acknowledged. This report represents observational clinical experience without a control group, limiting causal inference. Functional testing guided clinical decision-making but is not universally standardized, and results should be interpreted within clinical context. Wearable sleep data and patient-reported outcomes provide valuable insight into functional change but lack the rigor of laboratory-based measures. Additionally, hormonal transitions common in perimenopausal and postmenopausal females may have influenced outcomes.

Despite these limitations, this case contributes to the growing clinical dialogue surrounding integrative approaches to post-viral POTS. It highlights the importance of longitudinal care, pattern recognition, and individualized intervention in addressing the complex interplay between immune stress, gut ecology, endocrine function, and autonomic regulation. Further research, including prospective and comparative studies, is warranted to better define the role of integrative strategies in the management of POTS.

Conclusion

This case highlights the potential clinical value of a longitudinal, integrative approach to postural orthostatic tachycardia syndrome (POTS) in midlife females with prior COVID-19 exposure. By addressing autonomic dysfunction through targeted support of electrolyte balance, gut ecology, immune signaling, and HPA axis regulation, patients experienced meaningful improvements in symptom burden, functional capacity, and physiologic resilience over time. Although recovery was nonlinear and influenced by ongoing stressors, serial reassessment and individualized care supported sustained progress and improved self-management. These findings underscore the importance of systems-based, patient-centered strategies in the management of post-viral POTS.

Tables and Figures

Table 1. Longitudinal Clinical and Functional Outcome Trends Over Two Years

Domain	Baseline Findings	6-Month Trends	12–24 Month Trends
Electrolyte & Mineral Status	Suboptimal potassium and RBC magnesium; symptoms consistent with mineral insufficiency	Gradual normalization of potassium and magnesium levels; improved tolerance to hydration strategies	Sustained mineral repletion with improved vascular stability and reduced orthostatic symptoms
Thyroid Hormone Conversion	Elevated reverse T3 suggestive of stress-related impaired conversion	Downward trend in reverse T3 with stress and metabolic support	Reverse T3 within optimal range or clinically improved, correlating with improved energy and exercise tolerance
Adrenal/HPA Axis Function	Low DHEA-S, rapid cortisol metabolism, increased cortisol-to-cortisone conversion	Gradual increase in DHEA-S; improved stress tolerance	Sustained improvement in adrenal reserve and physiologic resilience
Sleep Quality	Fragmented sleep and non-restorative sleep reported	Improved sleep duration and efficiency	Consistently improved sleep quality and recovery metrics tracked via wearable devices (Apple Watch, OURA Ring)
Blood Pressure Stability	Labile blood pressure with orthostatic changes	Improved blood pressure consistency and fewer symptomatic drops	Stable blood pressure patterns documented via home tracking journals
Immune & Inflammatory Markers	Elevated WBC, gut immune activation, reduced sIgA	Reduction in inflammatory patterns and improved mucosal immune markers	Sustained immune resilience with fewer flares associated with infections or stress

*Trends represent aggregate clinical observations across longitudinal follow-up and are reported descriptively rather than as quantitative outcomes.

 

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Dr. Adelena Izold, ND is a licensed naturopathic physician specializing in integrative primary care, women’s health, cardiometabolic disease, and complex chronic illness. She earned her Doctor of Naturopathic Medicine degree from the National University of Natural Medicine (NUNM), where she received advanced clinical training in functional medicine, endocrine balance, and evidence-informed natural therapeutics.

Dr. Izold focuses on identifying root causes of chronic disease through comprehensive laboratory assessment, lifestyle medicine, botanical therapeutics, and targeted nutritional interventions. Her clinical interests include cardiovascular risk reduction, hormone optimization, thyroid dysfunction, autoimmune conditions, and personalized preventive medicine. She is committed to bridging conventional and naturopathic approaches to deliver collaborative, patient-centered care that supports long-term resilience and metabolic health.

 

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