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4 Current andEmerging Therapies forAtherosclerosis
https://t.me/medicina_free
The potential cardiovascular benets of this agent have been further demonstrated via reports of favourable effects on plaque imaging and are being evaluated in large prospective studies. Cannakinumab is an interleukin-1β antagonist, thought to play a role in modulating inammasome activity. A large cardiovascular outcomes trial of statin-treated patients with elevated CRP levels demonstrated that administration of canakinumab reduced the incidence of cardiovascular events, albeit with a predict­able excess in infection [80]. In parallel, a reduction in lung cancer was observed, underscoring the signicant burden of smoking related lung disease in patients with clinically manifest atherosclerotic disease. The ndings of this study provide the rst, large scale validation that specically targeting inammation can have a pro­tective benet in terms of reducing residual risk beyond statin therapy.
81
4.10 Obesity Targeted Therapies
The rising global prevalence of cardiometabolic risk factors parallels the spread of abdominal obesity. Efforts to curb obesity have the potential to reduce both associ­ated risk factors, but more importantly cardiovascular complications. When intro­duced at an early stage in life, weight loss has been demonstrated to result in regression of early changes within the vessel wall. The benets on cardiovascular risk in older individuals has proven more challenging to demonstrate. While improv­ing the cardiac risk factor prole, weight loss strategies have not yet proven to reduce cardiovascular event rates in large outcomes trials. This is further supported by use of a range of pharmacological agents, specically designed to achieve weight loss, in which a lack of clinical benet, and in some circumstances, an excess in adverse events has been observed. Whether the weight loss and observed improve­ment in risk factor prole with GLP-1 receptor agonists produces clinical benet in the setting of overweight or obesity, but not diabetes, remains to be determined in clinical trials. An additional approach involves the use of surgical interventions for extreme levels of obesity. While use of lap band techniques have not proven to be successful. More extensive techniques involving Roux-en-Y gastric bypass or sleeve gastrectomy produce robust and durable metabolic benets, which may have a greater potential to translate to less cardiovascular events [81].
Beyond its effects on conventional metabolic risk factors, obesity is also associ­ated with an excess rate of sleep disordered breathing [82]. Numerous reports have demonstrated an increase in cardiovascular risk with worsening degrees of obstruc­tive sleep apnoea. A range of mechanisms may underscore this association leading to potentially an increase in atherosclerotic, heart failure and arrhythmia related events. While there is considerable interest in the potential role for sleep apnoea targeted interventions to reduce vascular events, the one large outcomes trial per­formed to date in this space failed to demonstrate a reduction in cardiovascular risk [83]. Whether specic triage of patients and dedicated efforts to promoting greater adherence to therapy during the night results in a greater chance of success remains to be determined.
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A. J. Nelson and S. J. Nicholls
4.11 Cardiac Rehabilitation
With a large body of evidence supporting both lifestyle and pharmacologic approaches to secondary prevention of atherosclerotic cardiovascular disease, there has been increasing interest in the provision of rehabilitation services to patients, particularly in the early weeks following an acute ischaemic event. This has the potential to reinforce information for patients about living with cardiovascular dis­ease and the rationale for ongoing compliance with preventive therapies. Such clin­ics have proven to result in greater adherence with therapy, better risk factor control and several reports of potential reductions in recurrent clinical events [84, 85]. More efforts are required to determine how to maximise a patient’s chance of attending and completing these programs, which are likely to be achieved by offering services in a range of formats and attempts to integrate digital technologies into the long term monitoring of a patient’s risk factor control.
4.12 Conclusion
Atherosclerotic cardiovascular disease continues to present a major challenge through­out the world. While advances in lifestyle and pharmacologic approaches have made a substantial impact in reducing risk, many patients are either not offered the full complement of established therapies or their adherence with these approaches declines over time. There are ongoing efforts to develop new therapies and to maximise use of established approaches in the patients that are most likely to benet from their use.
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Further Reading
Anand SS, Bosch J, Eikelboom JW, Connolly SJ, Diaz R, Widimsky P, et al. Rivaroxaban with
or without aspirin in patients with stable peripheral or carotid artery disease: an international,
randomised, double-blind, placebo-controlled trial. Lancet. 2018;391:219–29. https://doi.
org/10.1016/S0140-6736(17)32409-1.
Das SR, Everett BM, Birtcher KK, Brown JM, Cefalu WT, Januzzi JL Jr, etal. 2018 ACC expert
consensus decision pathway on novel therapies for cardiovascular risk reduction in patients
with type 2 diabetes and atherosclerotic cardiovascular disease: a report of the American
College of Cardiology Task Force on Expert Consensus Decision Pathways. J Am Coll Cardiol.
2018;72:3200–23. Eikelboom JW, Connolly SJ, Bosch J, Dagenais GR, Hart RG, Shestakovska O, etal. Rivaroxaban
with or without aspirin in stable cardiovascular disease. N Engl J Med. 2017;377:1319–30.
https://doi.org/10.1056/NEJMoa1709118.
Grundy SM, Stone NJ, Bailey AL, Beam C, Birtcher KK, Blumenthal RS, etal. 2018 AHA/ACC/
AACVPR/AAPA/ABC/ACPM/ADA/AGS/APhA/ASPC/NLA/PCNA guideline on the man-
agement of blood cholesterol: a report of the American College of Cardiology/American Heart
Association Task Force on Clinical Practice Guidelines. Circulation. 2019;139:e1082–e143.
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Nicholls SJ, Nelson AJ.HDL and cardiovascular disease. Pathology. 2019;51:142–7. https://doi.
org/10.1016/j.pathol.2018.10.017.
Secemsky EA, Yeh RW, Kereiakes DJ, Cutlip DE, Steg PG, Massaro JM, etal. Extended duration
dual antiplatelet therapy after coronary stenting among patients with peripheral arterial disease:
a subanalysis of the dual antiplatelet therapy study. JACC Cardiovasc Interv. 2017;10:942–54.
https://doi.org/10.1016/j.jcin.2017.02.013.
Whelton PK, Carey RM, Aronow WS, Casey DE Jr, Collins KJ, Dennison Himmelfarb C, etal.
2017 ACC/AHA/AAPA/ABC/ACPM/AGS/APhA/ASH/ASPC/NMA/PCNA guideline for
the prevention, detection, evaluation, and management of high blood pressure in adults:
a report of the American College of Cardiology/American Heart Association Task Force
on Clinical Practice Guidelines. Circulation. 2018;138:e484–594.
CIR.0000000000000596.
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https://doi.org/10.1161/
Chapter 5
https://t.me/medicina_free
Pathophysiology ofAngiogenesis andIts Role inVascular Disease
NathanK.P.Wong, EmmaL.Solly, ChristinaA.Bursill, JoanneT.M.Tan, andMartinK.C.Ng
Key Learning Points
Angiogenesis is the process of new blood vessel formation from pre-existing
vessels that is critical for growth and development and in response to tissue isch-
aemia such as that seen during a myocardial infarction or in peripheral artery
disease.
• Uncontrolled angiogenesis is a key contributor to the development and progres-
sion of malignant cancers and atherosclerotic plaque formation. Angiogenesis-
associated diseases are the leading causes of mortality and morbidity worldwide.
Impaired angiogenic responses underpin the mechanisms associated with diabe-
tes- and age-related vascular complications.
• The intricate balance between desirable physiological angiogenesis and unwanted
pathological angiogenesis involves the regulation of a suite of signalling
Joanne T.M. Tan and Martin K.C. Ng contributed equally to this work.
N. K. P. Wong South Australian Health and Medical Research Institute, Adelaide, SA, Australia
The University of Sydney, Sydney, NSW, Australia
E. L. Solly South Australian Health and Medical Research Institute, Adelaide, SA, Australia
The University of Adelaide, Adelaide, SA, Australia
C. A. Bursill · J. T. M. Tan ( South Australian Health and Medical Research Institute, Adelaide, SA, Australia
The University of Sydney, Sydney, NSW, Australia
The University of Adelaide, Adelaide, SA, Australia e-mail: Joanne.Tan@sahmri.com
M. K. C. Ng The University of Sydney, Sydney, NSW, Australia
Royal Prince Alfred Hospital, Sydney, NSW, Australia
R. Fitridge (ed.), Mechanisms of Vascular Disease,
https://doi.org/10.1007/978-3-030-43683-4_5
*)
89© Springer Nature Switzerland AG 2020
90
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pathways, regulatory factors and cell-to-cell interactions. Physiological angio-
genesis is primarily mediated by the hypoxia transcription factor HIF-1α while
pathological angiogenesis is driven by the inammatory transcription factor
NFκB. Numerous angiogenic mediators can be driven by both hypoxia and
inammation.
N. K. P. Wong et al.
5.1 Introduction
The human circulatory system is comprised of a complex branching network of blood vessels designed to transport oxygen and nutrients to cells, remove waste products and facilitate immune surveillance. Given its diverse functions, this vascu­lar network must be responsive and capable of adapting to a range of tissue micro­environments, stressors and changing metabolic demands. In the physiologic state, this is achieved through dynamic yet highly coordinated processes of blood vessel growth and remodelling, which are under the balanced control of both stimulating and inhibiting factors. In disease states, however, these processes are frequently dysregulated, with inadequate, excessive or abnormal vessel growth potentially leading to a broad range of clinical pathologies [1].
Angiogenesis refers to the process in which new blood vessels, in particular cap­illaries, are formed from the pre-existing vascular network. Angiogenesis is distin­guished from vasculogenesis, which refers to the assembly of a primary vascular plexus, typically in the developing embryo, that arises de novo from the differentia­tion of mesoderm-derived precursors called angioblasts [2]. Recent decades of research have begun to reveal some of the cellular and molecular mechanisms that underpin the contribution of angiogenesis to the pathophysiology of vascular dis­eases. Pro-angiogenic stimuli activate endothelial cells (ECs) to detach from their basement membranes, then migrate and proliferate to form branching tubular struc­tures, driving the sprouting of new capillaries from the primary plexus [2, 3]. Further remodelling involves the recruitment of mural cells such as vascular smooth muscle cells (VSMCs) and pericytes, as well as the laying down of extracellular matrix (ECM) to provide structural stability and facilitate vessel maturation [3]. This pro­cess continues until pro-angiogenic cues subside or are inhibited, at which point vessel growth becomes quiescent and anti-angiogenic factors predominate.
It is well recognised that angiogenesis is a critical process in normal postnatal growth and development. It is crucial in providing nourishment to granulation tissue during wound healing, as well as in the formation of collateral vessels as part of an adaptive response to vascular occlusion and ischaemia [ angiogenesis plays an important role in conditions such as ischaemic heart disease, peripheral arterial disease (PAD), delayed wound healing and ischaemic stroke. Conversely, excessive pathological angiogenesis driven by inammation is a key contributor to the development and progression of malignant cancers, atheroscle­rotic plaques, proliferative retinal disease and inammatory arthritides, as well as many other pathologies [5]. A detailed and holistic understanding of the factors
4]. The failure of adequate