Dynamic Wheelchair Seating Positions Impact Cardiovascular Function after Spinal Cord Injury

Background Innovative wheelchairs allow individuals to change position easily for comfort and social situations. While these wheelchairs are beneficial in multiple ways, the effects of position changes on blood pressure might exacerbate hypotension and cerebral hypoperfusion, particularly in those with spinal cord injury (SCI) who can have injury to autonomic nerves that regulate cardiovascular control. Conversely, cardiovascular benefits may be obtained with lowered seating. Here we investigate the effect of moderate changes in wheelchair position on orthostatic cardiovascular and cerebrovascular reflex control. Methods Nineteen individuals with SCI and ten neurologically-intact controls were tested in supine and seated positions (neutral, lowered, and elevated) in the Elevation™ wheelchair. Participants with SCI were stratified into two groups by the severity of injury to cardiovascular autonomic pathways. Beat-to-beat blood pressure, heart rate and middle cerebral artery blood flow velocity (MCAv) were recorded non-invasively. Results Supine blood pressure and MCAv were reduced in individuals with lesions to autonomic pathways, and declined further with standard seating compared to those with preserved autonomic control. Movement to the elevated position triggered pronounced blood pressure and MCAv falls in those with autonomic lesions, with minimum values significantly reduced compared to the seated and lowered positions. The cumulative duration spent below supine blood pressure was greatest in this group. Lowered seating bolstered blood pressure in those with lesions to autonomic pathways. Conclusions Integrity of the autonomic nervous system is an important variable that affects cardiovascular responses to orthostatic stress and should be considered when individuals with SCI or autonomic dysfunction are selecting wheelchairs

The perspectives of educators, regulators and funders of massage therapy on the state of the profession in British Columbia, Canada

Background: Registered Massage Therapists (RMTs) are valuable members of the healthcare team who assist in health promotion, disease prevention, treatment, rehabilitation and palliation. RMT visits have increased across Canada over the past decade with the highest increase in British Columbia (BC). Currently, RMTs are private practitioners of healthcare operating within a largely publicly funded system, positioning them outside of the dominant system of healthcare and making them an important case study in private healthcare. In another paper we examined the perspectives of RMTs themselves. Here, we offer perspectives of regulators, educators and funders of Massage Therapy (MT) on advancement of the profession. Methods: We interviewed 28 stakeholders of MT in BC – including members of the MT regulatory board, representatives from MT colleges in BC and public and private health insurers. Results: All three groups identified research, particularly on efficacy of MT, as playing a vital role in enhancing the professional credibility of MT. However, participants noted that presently research is not a large feature of the current MT curricula and we analyze why this may be and how it can improve. Finally, conferral of baccalaureate degree status could assist RMTs in gaining recognition with the general public and other healthcare professionals. Conclusion: RMTs have potential to ameliorate population health in a cost-effective manner. Their role in British Columbia’s healthcare landscape could be expanded if they produce more research and earn degree status.Family Practice, Department ofPopulation and Public Health (SPPH), School ofMedicine, Faculty ofReviewedFacult

The perspectives of educators, regulators and funders of massage therapy on the state of the profession in British Columbia, Canada

Abstract Background Registered Massage Therapists (RMTs) are valuable members of the healthcare team who assist in health promotion, disease prevention, treatment, rehabilitation and palliation. RMT visits have increased across Canada over the past decade with the highest increase in British Columbia (BC). Currently, RMTs are private practitioners of healthcare operating within a largely publicly funded system, positioning them outside of the dominant system of healthcare and making them an important case study in private healthcare. In another paper we examined the perspectives of RMTs themselves. Here, we offer perspectives of regulators, educators and funders of Massage Therapy (MT) on advancement of the profession. Methods We interviewed 28 stakeholders of MT in BC – including members of the MT regulatory board, representatives from MT colleges in BC and public and private health insurers. Results All three groups identified research, particularly on efficacy of MT, as playing a vital role in enhancing the professional credibility of MT. However, participants noted that presently research is not a large feature of the current MT curricula and we analyze why this may be and how it can improve. Finally, conferral of baccalaureate degree status could assist RMTs in gaining recognition with the general public and other healthcare professionals. Conclusion RMTs have potential to ameliorate population health in a cost-effective manner. Their role in British Columbia’s healthcare landscape could be expanded if they produce more research and earn degree status.</p

Table1_Cardiovascular and cerebrovascular responses to urodynamics testing after spinal cord injury: The influence of autonomic injury.DOCX

Autonomic dysfunction is a prominent concern following spinal cord injury (SCI). In particular, autonomic dysreflexia (AD; paroxysmal hypertension and concurrent bradycardia in response to sensory stimuli below the level of injury) is common in autonomically-complete injuries at or above T6. AD is currently defined as a >20 mmHg increase in systolic arterial pressure (SAP) from baseline, without heart rate (HR) criteria. Urodynamics testing (UDS) is performed routinely after SCI to monitor urological sequelae, often provoking AD. We, therefore, aimed to assess the cardiovascular and cerebrovascular responses to UDS and their association with autonomic injury in individuals with chronic (>1 year) SCI. Following blood draw (plasma norepinephrine [NE]), continuous SAP, HR, and middle cerebral artery blood flow velocity (MCAv) were recorded at baseline (10-minute supine), during standard clinical UDS, and recovery (10-minute supine) (n = 22, age 41.1 ± 2 years, 15 male). Low frequency variability in systolic arterial pressure (LF SAP; a marker of sympathetic modulation of blood pressure) and cerebral resistance were determined. High-level injury (≥T6) with blunted/absent LF SAP (2) and/or low plasma NE (−1) indicated autonomically-complete injury. Known electrocardiographic markers of atrial (p-wave duration variability) and ventricular arrhythmia (T-peak–T-end variability) were evaluated at baseline and during UDS. Nine participants were determined as autonomically-complete, yet 20 participants had increased SAP >20 mmHg during UDS. Qualitative autonomic assessment did not discriminate autonomic injury. Maximum SAP was higher in autonomically-complete injuries (207.1 ± 2.3 mmHg) than autonomically-incomplete injuries (165.9 ± 5.3 mmHg) during UDS (p 0.05). Cerebrovascular resistance index was increased during UDS in autonomically-complete injuries compared to baseline (p < 0.001) and recovery (p < 0.001) reflecting intact cerebral autoregulation. Risk for both atrial and ventricular arrhythmia increased during UDS compared to baseline (p < 0.05), particularly in autonomically-complete injuries (p < 0.05). UDS is recommended yearly in chronic SCI but is associated with profound AD and an increased risk of arrhythmia, highlighting the need for continued monitoring during UDS. Our data also highlight the need for HR criteria in the definition of AD and the need for quantitative consideration of autonomic function after SCI.</p

Dynamic wheelchair seating positions impact cardiovascular function after spinal cord injury.

Innovative wheelchairs allow individuals to change position easily for comfort and social situations. While these wheelchairs are beneficial in multiple ways, the effects of position changes on blood pressure might exacerbate hypotension and cerebral hypoperfusion, particularly in those with spinal cord injury (SCI) who can have injury to autonomic nerves that regulate cardiovascular control. Conversely, cardiovascular benefits may be obtained with lowered seating. Here we investigate the effect of moderate changes in wheelchair position on orthostatic cardiovascular and cerebrovascular reflex control.Nineteen individuals with SCI and ten neurologically-intact controls were tested in supine and seated positions (neutral, lowered, and elevated) in the Elevation™ wheelchair. Participants with SCI were stratified into two groups by the severity of injury to cardiovascular autonomic pathways. Beat-to-beat blood pressure, heart rate and middle cerebral artery blood flow velocity (MCAv) were recorded non-invasively.Supine blood pressure and MCAv were reduced in individuals with lesions to autonomic pathways, and declined further with standard seating compared to those with preserved autonomic control. Movement to the elevated position triggered pronounced blood pressure and MCAv falls in those with autonomic lesions, with minimum values significantly reduced compared to the seated and lowered positions. The cumulative duration spent below supine blood pressure was greatest in this group. Lowered seating bolstered blood pressure in those with lesions to autonomic pathways.Integrity of the autonomic nervous system is an important variable that affects cardiovascular responses to orthostatic stress and should be considered when individuals with SCI or autonomic dysfunction are selecting wheelchairs.This work was supported in part by the Heart and Stroke Foundation of British Columbia and the Yukon (V.E.C)

Mean cardiovascular variables in different wheelchair positions.

<p>Mean cardiovascular variables in different wheelchair positions.</p

Participant demographics and baseline cardiovascular parameters.

<p>Participant demographics and baseline cardiovascular parameters.</p

Cumulative orthostatic burden in seated and elevated wheelchair positions.

<p>A. Cumulative orthostatic burden was calculated as the cumulative area under the curve (AUC) for the duration of each wheelchair position: the difference between baseline systolic arterial pressure (SAP) and SAP multiplied by the duration of each beat. B. Example traces from a representative individual in each group. Dotted horizontal line indicates supine SAP for that individual and shaded area indicates regions below supine SAP. Vertical adjoining lines denote significant differences between indicated groups; double dagger (‡) indicates significant difference from seated position; double S (§) indicates significant difference from elevated position.</p