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Lloyd MG, Wakeling JM, Koehle MS, Drapala RJ, Claydon VE. Carotid sinus hypersensitivity: block of the sternocleidomastoid muscle does not affect responses to carotid sinus massage in healthy young adults. Physiol Rep 2017; 5:5/19/e13448. [PMID: 29038360 PMCID: PMC5641935 DOI: 10.14814/phy2.13448] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Revised: 08/15/2017] [Accepted: 08/16/2017] [Indexed: 12/18/2022] Open
Abstract
The arterial baroreflex is crucial for short‐term blood pressure control – abnormal baroreflex function predisposes to syncope and falling. Hypersensitive responses to carotid baroreflex stimulation using carotid sinus massage (CSM) are common in older adults and may be associated with syncope. The pathophysiology of this hypersensitivity is unknown, but chronic denervation of the sternocleidomastoid muscles is common in elderly patients with carotid sinus hypersensitivity (CSH), and is proposed to interfere with normal integration of afferent firing from the carotid baroreceptors with proprioceptive feedback from the sternocleidomastoids, producing large responses to CSM. We hypothesized that simulation of sternocleidomastoid “denervation” using pharmacological blockade would increase cardiovascular responses to CSM. Thirteen participants received supine and tilted CSM prior to intramuscular injections (6–8 mL distributed over four sites) of 2% lidocaine hydrochloride, and 0.9% saline (placebo) in contralateral sternocleidomastoid muscles. Muscle activation was recorded with electromyography (EMG) during maximal unilateral sternocleidomastoid contraction both pre‐ and postinjection. Supine and tilted CSM were repeated following injections and responses compared to preinjection. Following lidocaine injection, the muscle activation fell to 23 ± 0.04% of the preinjection value (P < 0.001), confirming neural block of the sternocleidomastoid muscles. Cardiac (RRI, RR interval), forearm vascular resistance (FVR), and systolic arterial pressure (SAP) responses to CSM did not increase after lidocaine injection in either supine or tilted positions (supine: ΔRRI −72 ± 31 ms, ΔSAP +2 ± 1 mmHg, ΔFVR +4 ± 4%; tilted: ΔRRI −20 ± 13 ms, ΔSAP +2 ± 2 mmHg, ΔFVR +2 ± 4%; all P > 0.05). Neural block of the sternocleidomastoid muscles does not increase cardiovascular responses to CSM. The pathophysiology of CSH remains unknown.
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Affiliation(s)
- Matthew G Lloyd
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - James M Wakeling
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
| | - Michael S Koehle
- School of Kinesiology, University of British Columbia, Vancouver, British Columbia, Canada.,Division of Sport and Exercise Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Robert J Drapala
- Division of Sport and Exercise Medicine, University of British Columbia, Vancouver, British Columbia, Canada
| | - Victoria E Claydon
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, British Columbia, Canada
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Plakornkul V, Vannabhum M, Viravud Y, Roongruangchai J, Mutirangura P, Akarasereenont P, Laohapand T. The effects of the court-type Thai traditional massage on anatomical relations, blood flow, and skin temperature of the neck, shoulder, and arm. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 16:363. [PMID: 27629400 PMCID: PMC5024484 DOI: 10.1186/s12906-016-1282-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Accepted: 08/11/2016] [Indexed: 11/10/2022]
Abstract
Background Court-type Thai traditional massage (CTTM) has specific major signal points (MaSP) for treating musculoskeletal conditions. The objectives of this study are to investigate the anatomical surfaces and structures of MaSPs, and to examine blood flow (BF) and skin temperature (ST) changes after applying pressure on the MaSPs on neck, shoulder, and arm areas. Methods In the anatomical study, 83 cadavers were dissected and the anatomical surfaces and structures of the 15 MaSPs recorded. In human volunteers, BF, peak systolic velocity (PS), diameter of artery (DA), and ST changes were measured at baseline and after pressure application at 0, 30, 60, 180, and 300 s. Results There was no statistical difference in anatomical surfaces and structures of MaSP between the left and right side of the body. The 3 MaSPs on the neck were shown to be anatomically separated from the location of the common carotid arteries. The BF of MaSPs of the neck significantly and immediately increased after pressure application for 30 s and for 60 s in the arm (p < 0.001). ST increased significantly and immediately after pressure application for 300 s (p < 0.001). There was no significant correlation between BF and ST at any of the MaSPs. Conclusions This study showed that MaSP massages were mainly directed towards muscles. MaSPs can cause significant, but brief, increases in BF and ST. Further studies are suggested to identify changes in BF and ST for all of the MaSPs after actual massage treatment sessions as well as other physiological effects of massage.
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Abstract
Carotid sinus hypersensitivity, first described less than 65 years ago, is an important and often undiagnosed cause of syncope in the elderly. Its pathophysiology is complex and certain aspects are not completely understood. The timely diagnosis and treatment of this condition can improve morbidity and prevent complications in the elderly. In this article, the prevalence, risk factors, pathophysiology, diagnosis, aspects of carotid sinus massage, and treatment options for the different kinds of carotid sinus hypersensitivity are discussed.
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Solari D, Maggi R, Oddone D, Solano A, Croci F, Donateo P, Wieling W, Brignole M. Assessment of the Vasodepressor Reflex in Carotid Sinus Syndrome. Circ Arrhythm Electrophysiol 2014; 7:505-10. [DOI: 10.1161/circep.113.001093] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Diana Solari
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Roberto Maggi
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Daniele Oddone
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Alberto Solano
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Francesco Croci
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Paolo Donateo
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Wouter Wieling
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
| | - Michele Brignole
- From the Department of Cardiology, Arrhythmologic Center, Ospedali del Tigullio, Lavagna, Italy (D.S., R.M., D.O., A.S., F.C., P.D., M.B.); and Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands (W.W.)
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Wieling W, Krediet CTP, Solari D, de Lange FJ, van Dijk N, Thijs RD, van Dijk JG, Brignole M, Jardine DL. At the heart of the arterial baroreflex: a physiological basis for a new classification of carotid sinus hypersensitivity. J Intern Med 2013; 273:345-58. [PMID: 23510365 DOI: 10.1111/joim.12042] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The aim of this review is to provide an update of the current knowledge of the physiological mechanisms underlying reflex syncope. Carotid sinus syncope will be used as the classical example of an autonomic reflex with relatively well-established afferent, central and efferent pathways. These pathways, as well as the pathophysiology of carotid sinus hypersensitivity (CSH) and the haemodynamic effects of cardiac standstill and vasodilatation will be discussed. We will demonstrate that continuous recordings of arterial pressure provide a better understanding of the cardiovascular mechanisms mediating arterial hypotension and cerebral hypoperfusion in patients with reflex syncope. Finally we will demonstrate that the current criteria to diagnose CSH are too lenient and that the conventional classification of carotid sinus syncope as cardioinhibitory, mixed and vasodepressor subtypes should be revised because isolated cardioinhibitory CSH (asystole without a fall in arterial pressure) does not occur. Instead, we suggest that all patients with CSH should be thought of as being 'mixed', between cardioinhibition and vasodepression. The proposed stricter set of criteria for CSH should be evaluated in future studies.
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Affiliation(s)
- W Wieling
- Department of Internal Medicine, Academic Medical Centre, University of Amsterdam, Amsterdam, the Netherlands.
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Lagi A, Cerisano S, Cencetti S. Recurrent syncope in patients with carotid sinus hypersensitivity. ISRN CARDIOLOGY 2012; 2012:216206. [PMID: 22997591 PMCID: PMC3444836 DOI: 10.5402/2012/216206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 08/13/2012] [Indexed: 12/31/2022]
Abstract
Syncope recurrence in pacemaker-implanted subjects for the cardio-inhibitory response to sinus carotid massage (SCM) was investigated. The study-hypothesis was that recurrences had significant vasodepressor responses that could justify the loss of consciousness. Forty-six patients were enrolled (16 patients and 30 controls), followed and revaluated after 5–7 years. At the end of follow-up, significant differences were found between patients and controls in mean SCM SAP (87 versus 106 mmHg) and reduction in mean SCM SAP (59 versus 38 mmHg); in the number of symptomatic subjects soon after SCM (5 versus 1); and in the number of subjects suffering from orthostatic hypotension. A subgroup of 13 patients showed significantly different hypotensive responses to SCM compared with the values observed at study recruitment. The data showed that some subjects with a defined hemodynamic pattern in response to SCM may change their characteristics and have spontaneous and/or provocative symptoms. These data explain the syncopal relapses, and suggest the presence of autonomic dysregulation in individuals with carotid sinus hypersensitivity.
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Affiliation(s)
- Alfonso Lagi
- UO Emergency Medicine and Syncope Unit, Ospedale Santa Maria Nuova-Firenze, Piazza S. Maria Nuova, 1-50131, Florence, Italy ; Cardiology Unit, Electrophysiology and Syncope Unit, Ospedale Santa Maria Nuova-Firenze, Piazza S. Maria Nuova, 1-50131, Florence, Italy
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