Left Sided Heart Failure

Left Sided Heart Failure

Aetiology

Depletion of blood flow in a cerebral artery resulting from a thrombus or embolus. (1)

Pathogenesis

Occlusion of cerebral artery production of ATP failure of energy pumps influx of sodium and calcium ions and efflux of potassium passive inflow of water cytotoxic oedema destruction of cells in infarct core.

Membrane depolarisation release of glutamate excessive calcium influx into neurons destruction of cells by lipolysis, proteolysis and free radicals. Left Sided Heart Failure

infarct core and ischaemic penumbra

necrotic tissue not able to conduct impulses interrupting normal function such as motor and sensory transmission and speech.

Risk factors

· Obesity

· Smoking

· Sedentary lifestyle

· Age 1.

· ageg

Clinical features

· Right-sided hemiplegia and weakness Left Sided Heart Failure

· Sensory loss on right side

· Inability to see the right visual field of each eye

· Aphasia

· Apraxia

· Dysarthria

· Impaired reasoning

· Behavioural changes

· Problems with memory

Diagnosis

· Complete history

· Physical and neurological examination Left Sided Heart Failure

· Brain MRI or CT scan –differentiate cerebral haemorrhage from ischaemic stroke

· Other tests for vascular imaging – CT angiography, magnetic resonance angiography

Primary prevention

· Don’t smoke

· Diet high in fruit and vegetables

· Diet low in fats and salt

· 30 minutes of exercise daily

· Limit alcohol

1,7

Treatment

Medical

· Reperfusion Thrombolytic (tPA )

Nursing acute phase

· Frequent evaluation of neurological status and vital signs Left Sided Heart Failure

· Oxygen saturations – administer oxygen if required

· Screen for swallowing – manage hydration and nutrition

· Manage activities of daily living

· Address appropriate communication strategies

· Prevent complications

Rehabilitation

· Passive and active movement

· Encourage activities provided by physiotherapists, speech and occupational therapists e.g. mobility, speech, ADL

· Education- Left Sided Heart Failure

Secondary prevention

· Neuroprotection – e.g, aspirin

Course of disease

With reperfusion – blood restored to area, many symptoms gradually resolve

Without treatment – ischaemia extends to penumbra –symptoms worsen. Recovery may continue 6 months to a year but left with disability. Requires rehabilitation to optimise function 8 Left Sided Heart Failure

Complications

· Contractures

· Incontinence

· Falls

· Mood disturbances

Death of brain tissue resulting from an occluded cerebral artery in the left side of the brain.. 6.

Prognosis

One in five likely to die within one month. Left Sided Heart Failure

Of those who recover about 90% will experience some impairment. 9

causes

Atherosclerosis

Prevents formation of

Leads to need for immediate

diagnoses

Diagnosed by

Results in

Disease: Ischaemic stroke affecting the dominant left cerebral hemisphere

Definition : An ischaemic stroke is death of brain tissue resulting from an occluded artery caused either by an atherosclerotic obstruction or embolus that interrupts blood supply to the area of the brain supplied by the occluded artery. The sudden loss of blood circulation results in a corresponding loss of neurologic function (Jauch, 2014). Left Sided Heart Failure

AETIOLOGY:

A depletion of blood flow in a cerebral artery resulting from a:

· Thrombus –atherosclerotic plaque that has ruptured in a cerebral artery

· Embolus

· from heart e.g. left atrial thrombus, left ventricular thrombus, atrial fibrillation

· from carotid artery (Craft &Gordon,2011)

PATHOGENESIS:

· Interruption of blood flow to cerebral tissue initiates a biochemical ischaemic cascade.

· Mitochondrial production of ATP ceases depolarisation  influx of sodium and calcium and efflux of potassium. Passive inflow of water into cells causes cytotoxic oedema and destruction of cells in infarct core. Left Sided Heart Failure

· Membrane depolarization also stimulates the release of neurotransmitters. Glutamate release excessive calcium influx into nearby neurons (exocitotoxicity) destruction of cells by lipolysis, proteolysis and free radicals.

· Mitochondria break down releasing toxins and apoptotic factors.

· Injured brain tissue triggers inflammatory response release of inflammatory mediators cell death and oedema

destruction of cells in infarct core necrosis Left Sided Heart Failure

ischaemic penumbra around core has diminished blood flow but preserved cellular metabolism.

Areas of necrotic tissue are not able to conduct nerve impulses so functions such as initiating and conveying motor impulses, receiving and interpreting sensory information and speech control will be interrupted.

(Bautista, 2014; Craft & Gordon, 2011; Maas & Safdieh,2009).

CLINICAL MANIFESTATIONS:

Just superior to the medullary junction, 90% of axons in the left pyramid cross to the right right motor dysfunction.

The middle cerebral artery supplies the frontal, temporal and parietal lobes as well as the basal ganglia and internal capsule. (Tocco,2011).

Therefore specific clinical manifestations include:

· Hemiplegia and weakness on right side of body Left Sided Heart Failure

· Sensory loss on right side

· Inability to see the right visual field of each eye

· Aphasia

· Apraxia

· Dysarthria

· Impaired reasoning

· Behavioural changes

· Problems with memory

(Bautista, 2014; Craft & Gordon, 2011).

DIAGNOSIS

· Complete history

· Physical and neurological examination

· Brain MRI or CT scan – Essential in differentiating cerebral haemorrhage from ischaemic stroke. MRI is superior as cerebral ischaemia can be identified within minutes and can identify small areas of stroke.

· Other tests for vascular imaging can be used e.g. CT angiography, magnetic resonance angiography

(Silverman & Rymer, 2009). Left Sided Heart Failure

TREATMENT

The emphasis of ischaemic stroke treatment is placed on salvaging potentially reversible ischemic penumbra brain tissue, preventing secondary stroke and minimising longterm disability. (Jaunch, 2014).

· Reperfusion

· thrombolytic agent (e.g.tPA)

· intra-arterial technique

· Neuroprotection

-antithrombotic therapy (e.g. aspirin)

· Nursing management

Acute phase

· frequent evaluation of neurological status Left Sided Heart Failure

· frequent evaluation of vital signs

· Monitor oxygen saturation – administer oxygen if required

· Screen for swallowing deficits and manage appropriate hydration and nutrition strategies

· Manage activities of daily living

· Screen for communication deficits and address appropriate communication strategies

· Prevent complications e,g pressure areas, contractures, DVT

· Assess urinary and faecal continence and address appropriately

Rehabilitation

· begin as early as possible by preventing complications, passive and active movement and mobilizing as early as possible.

· Support and encourage activities provided by physiotherapists, occupational therapists and speech therapists

· Education – e.g. lifestyle modification, adherence to medications Left Sided Heart Failure

(National Stroke Foundation, 2010).

COURSE OF DISEASE

· With reperfusion – blood is restored to the area and signs and symptoms gradually resolve

· Without treatment – Course is determined by severity of stroke. Ischaemia will extend to penumbra as stroke evolves, signs and symptoms worsen. As cerebral oedema resolves, and with structural and functional reorganisation recovery may continue for 6 months to a year. (peak recovery in about 3 months). Requires rehabilitation to optimise function.

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(Teasell & Hussein, 2014).

· Complications

Contractures Left Sided Heart Failure

Fatigue

Incontinence

Mood disturbances

Falls

Dysarthria and aphasia

PROGNOSIS

· Stroke prognosis is influenced by factors such as age and stroke severity.

· One in five likely to die within one month of suffering ischaemic stroke.

· Of those who recover about 90% will experience some impairment

(Dashe,2014)

PREVENTION

Eliminating modifiable risk factors will prevent an ischaemic stroke.

· Don’t smoke

· Diet high in fruit and vegetables, low in fats and salt

· 30 minutes of moderate-intensity physical activity on most days of the week

· Maintain healthy BMI

· Limit alcohol to no more than two standard drinks per day

(National Stroke Foundation, 2010) Left Sided Heart Failure

If a history of atrial fibrillation – ensure adherence to anticoagulation therapy.

References

Bautista, C. (2014). Disorders of Brain Function. In S. Grossman & C. Porth (Eds),

Porth’s pathophysiology: Concepts of altered health states (9th ed.). (pp489-

524). Philadelphia: Lippincott Williams & Wilkins.

Craft, J. & Gordon, C. (2011), Alterations of Neurological Function across the

Lifespan. In J.Craft, C.Gordon & A. Tiziani (Eds). Understanding

Pathophysiology (pp 188-226). Sydney, Australia:Elsevier Australia.

Dashe, J. F. (2014). Stroke prognosis in adults. UpToDate. Retrieved from:

http://www.uptodate.com/contents/stroke-prognosis-in-adults

Jaunch, E.C. (2014). Ischemic stroke treatment and management, Retrieved from:

http://emedicine.medscape.com/article/1916852-overview Left Sided Heart Failure

Maas, E.B. & Rymer, M.M. (2009). Ischaemic stroke: Pathophysiology and Principles

of Localization. Neurology 13 .Retrieved from:

http://www.turner-white.com/pdf/brm_Neur_V13P1.pdf

National Stroke Foundation (2010). Clinical guidelines for stroke management

2010. Melbourne Australia.

Silverman, I.E. & Rymer, M.M. (2009). An atlas of investigation and treatment.

Ischaemic stroke. Clinical publishing:Oxford,U.K.

Teasell, R.& Hussein, N. (2014)Brain reorganization, recovery and organizecare.

In Stroke rehabilitation clinician handbook 2014. Retrieved from:

http://www.ebrsr.com/sites/default/files/Chapter%202_Brain%20Reorganization,%20Recovery%20and%20Organized%20Care_June%2018%202014.pdf

Tocco, S. (2011). Identify the vessel recognize the stroke. American Nurse Today Left Sided Heart Failure

Also check: Using the Data/Information/Knowledge/Wisdom Continuum

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