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Pathology - Temporal Arteritis
Pathophysiology
Giant cell arteritis (GCA) is another name for temporal arteritis.
Temporal artery disease is a common symptom of systemic vasculitis, or GCA. Moreover, polymyalgia rheumatica, which affects the hips and shoulders, is closely linked to it. This disease causes inflammation in the arteries, which may lead to distal ischemia. It is possible for other carotid branches to become involved as well; blindness may result from ocular artery irritation.
Consequently, it's critical to start high-dose steroid treatment right away. Intravenous steroids may be beneficial if the patient has visual impairment. If the sample is obtained within a few days of the start of treatment, the use of steroids has no effect on the results of the biopsy.
Biopsies reveal big cells and granulomatous alterations, although a negative biopsy does not always rule out a diagnosis of GCA. This is because the regions collected during the biopsy may not contain the areas of inflammation, and the inflammation manifests themselves as skip lesions.
Pathophysiology
Giant cell arteritis (GCA) is another name for temporal arteritis.
Temporal artery disease is a common symptom of systemic vasculitis, or GCA. Moreover, polymyalgia rheumatica, which affects the hips and shoulders, is closely linked to it. This disease causes inflammation in the arteries, which may lead to distal ischemia. It is possible for other carotid branches to become involved as well; blindness may result from ocular artery irritation.
Consequently, it's critical to start high-dose steroid treatment right away. Intravenous steroids may be beneficial if the patient has visual impairment. If the sample is obtained within a few days of the start of treatment, the use of steroids has no effect on the results of the biopsy.
Biopsies reveal big cells and granulomatous alterations, although a negative biopsy does not always rule out a diagnosis of GCA. This is because the regions collected during the biopsy may not contain the areas of inflammation, and the inflammation manifests themselves as skip lesions.
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Pathology - Multiple Sclerosis
Pathophysiology
Even though the precise cause of this illness is still unknown, it is thought that multiple sclerosis has an immunological basis and that a distant Epstein-Barr virus (EBV) infection may be involved. Because of antibodies against myelin basic protein, neurons get demyelinated, resulting in CNS lesions. A wide spectrum of remitting and relapsing symptoms are found in patients, and the symptoms typically correspond physically with the lesions. Any patient exhibiting various neurologic abnormalities that cannot be explained by a single nervous system lesion should be suspected of having multiple sclerosis. Regardless of where the lesions originate, CSF examination can reveal oligoclonal bands even though the lesions are physically and temporally separate. Patients presenting with problems related to the eyes may also have internuclear ophthalmoplegia, which is caused by lesions originating in the medial longitudinal fasciculus (MLF), in addition to optic neuritis resulting in blurred vision. Due to a right MLF lesion, this patient presents with symptoms of both internuclear ophthalmoplegia and optic neuritis. Glatiramer acetate, which reduces the frequency of relapses, and interferon beta are considered gold standard therapy. Natrizumab, a monoclonal antibody targeting a cell adhesion molecule, and fingolimod, an immunomodulator generated from fungi, are two of the more recent treatments that have been developed.
Pathophysiology
Even though the precise cause of this illness is still unknown, it is thought that multiple sclerosis has an immunological basis and that a distant Epstein-Barr virus (EBV) infection may be involved. Because of antibodies against myelin basic protein, neurons get demyelinated, resulting in CNS lesions. A wide spectrum of remitting and relapsing symptoms are found in patients, and the symptoms typically correspond physically with the lesions. Any patient exhibiting various neurologic abnormalities that cannot be explained by a single nervous system lesion should be suspected of having multiple sclerosis. Regardless of where the lesions originate, CSF examination can reveal oligoclonal bands even though the lesions are physically and temporally separate. Patients presenting with problems related to the eyes may also have internuclear ophthalmoplegia, which is caused by lesions originating in the medial longitudinal fasciculus (MLF), in addition to optic neuritis resulting in blurred vision. Due to a right MLF lesion, this patient presents with symptoms of both internuclear ophthalmoplegia and optic neuritis. Glatiramer acetate, which reduces the frequency of relapses, and interferon beta are considered gold standard therapy. Natrizumab, a monoclonal antibody targeting a cell adhesion molecule, and fingolimod, an immunomodulator generated from fungi, are two of the more recent treatments that have been developed.
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Pathology - Guillain-Barré Syndrome
Pathophysiology
Peripheral demyelinating disease is known as Guillain-Barré syndrome (GBS). Usually, these individuals arrive with rapidly developing ascending paralysis. The disease's genesis is believed to be autoimmune, and several cases have been linked to different gastrointestinal tract illnesses. Given the patient's history of diarrhea and abdominal pain, Campylobacter jejuni is the most often encountered infection linked to GBS. The CSF analysis, which demonstrates albuminocytologic dissociation, is the cornerstone of the diagnostic assessment. This indicates that although the cell count is within the normal range, the protein is high. It is best to exclude out infectious etiologies if the cell count is increased. In order to treat GBS, either quick plasmapheresis to eliminate antibodies or IVIG injection to bind antibodies are necessary.
Pathophysiology
Peripheral demyelinating disease is known as Guillain-Barré syndrome (GBS). Usually, these individuals arrive with rapidly developing ascending paralysis. The disease's genesis is believed to be autoimmune, and several cases have been linked to different gastrointestinal tract illnesses. Given the patient's history of diarrhea and abdominal pain, Campylobacter jejuni is the most often encountered infection linked to GBS. The CSF analysis, which demonstrates albuminocytologic dissociation, is the cornerstone of the diagnostic assessment. This indicates that although the cell count is within the normal range, the protein is high. It is best to exclude out infectious etiologies if the cell count is increased. In order to treat GBS, either quick plasmapheresis to eliminate antibodies or IVIG injection to bind antibodies are necessary.
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Pathology - Amyotrophic Lateral Sclerosis
Pathophysiology
Lou Gehrig's disease, is also commonly known as amyotrophic lateral sclerosis . The distinct feature of this disease lies in its manifestation of symptoms affecting both upper and lower motor neurons, which can be attributed to involvement of the corticospinal tract fibers. The symptoms of upper motor neurons include spasticity, positive Babinski sign, and hyperreflexia.
Findings related to lower motor neurons include atrophy brought on by muscular denervation and fasciculations. This illness has been linked to mutations in superoxide dismutase, a catalyst with antioxidant properties. Progressive involvement of the brain stem might result in aphasia and dysphagia. The prognosis is bleak; respiratory failure usually results in death within a few years of diagnosis.
Pathophysiology
Lou Gehrig's disease, is also commonly known as amyotrophic lateral sclerosis . The distinct feature of this disease lies in its manifestation of symptoms affecting both upper and lower motor neurons, which can be attributed to involvement of the corticospinal tract fibers. The symptoms of upper motor neurons include spasticity, positive Babinski sign, and hyperreflexia.
Findings related to lower motor neurons include atrophy brought on by muscular denervation and fasciculations. This illness has been linked to mutations in superoxide dismutase, a catalyst with antioxidant properties. Progressive involvement of the brain stem might result in aphasia and dysphagia. The prognosis is bleak; respiratory failure usually results in death within a few years of diagnosis.
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Pathology - Brown-Séquard Syndrome
Pathophysiology
Hemisection of the spinal cord laterally causes Brown-Séquard syndrome. The corticospinal tract fibers, which decussate at the level of the medulla, are severed, resulting in paralysis. The dorsal column/medial lemniscal route is severed, and this leads to a decrease in vibration and proprioception. The pathway also decusses at the medulla level. Severing the spinothalamic tract at the point where it enters the spinal cord causes a reduction in pain perception. This results in the ipsilateral paralysis, reduced vibration/proprioception, and contralateral loss of pain/temperature sensation, which are the hallmark signs of Brown-Séquard syndrome.
Pathophysiology
Hemisection of the spinal cord laterally causes Brown-Séquard syndrome. The corticospinal tract fibers, which decussate at the level of the medulla, are severed, resulting in paralysis. The dorsal column/medial lemniscal route is severed, and this leads to a decrease in vibration and proprioception. The pathway also decusses at the medulla level. Severing the spinothalamic tract at the point where it enters the spinal cord causes a reduction in pain perception. This results in the ipsilateral paralysis, reduced vibration/proprioception, and contralateral loss of pain/temperature sensation, which are the hallmark signs of Brown-Séquard syndrome.
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Pathology - Subarachnoid Bleeding
Pathophysiology
In this instance, the bleeding is most likely the result of a berry aneurysm rupturing. Because of the uneven collagen deposition in the vasculature, berry aneurysms are frequently connected with Marfan's syndrome, which the patient's height implies may be the cause of. The symptoms of ipsilateral oculomotor nerve palsy, also known as cranial nerve III palsy, include an extorted, laterally turned eye with a dilated pupil. Berry aneurysms of the posterior connecting artery can induce this condition. Compression of the nearby oculomotor nerve is the cause of this. In addition to frank blood on lumbar puncture, patients with subarachnoid hemorrhage may also have xanthochromia, or yellow staining of CSF, as a result of RBC breakdown. Subarachnoid blood irritates the meninges, causing nuchal stiffness. In addition to nimodipine, a dihydropyridine calcium channel blocker that prevents reactive vasospasm and consequent ischemia to the tissue fed by the afflicted arterial, surgically cutting the aneurysm is the method of treatment.
Pathophysiology
In this instance, the bleeding is most likely the result of a berry aneurysm rupturing. Because of the uneven collagen deposition in the vasculature, berry aneurysms are frequently connected with Marfan's syndrome, which the patient's height implies may be the cause of. The symptoms of ipsilateral oculomotor nerve palsy, also known as cranial nerve III palsy, include an extorted, laterally turned eye with a dilated pupil. Berry aneurysms of the posterior connecting artery can induce this condition. Compression of the nearby oculomotor nerve is the cause of this. In addition to frank blood on lumbar puncture, patients with subarachnoid hemorrhage may also have xanthochromia, or yellow staining of CSF, as a result of RBC breakdown. Subarachnoid blood irritates the meninges, causing nuchal stiffness. In addition to nimodipine, a dihydropyridine calcium channel blocker that prevents reactive vasospasm and consequent ischemia to the tissue fed by the afflicted arterial, surgically cutting the aneurysm is the method of treatment.
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Pathology - Amaurosis Fugax
Pathophysiology
Amaurosis fugax is a temporary, unilateral blindness.
He has a number of risk factors, including hypertension, diabetes, hyperlipidemia, and tobacco use, which indicate the underlying problem of atherosclerosis.
LDL molecules accumulate and oxidize inside the vessel wall over time, triggering an inflammatory reaction. The oxidized LDL is phagocytosed by macrophages, resulting in foam cells that have the potential to burst and intensify inflammation. The vessel thickens as a result, forming a membrane to seal off the inflammatory process. This contributes to the physical examination finding of a carotid bruit by decreasing the luminal width of the vessel and increasing the velocity of blood flow through that location. Ruptures of the carotid atherosclerotic plaque have the potential to induce stroke by releasing emboli into the cerebral circulation. In the event of amaurosis fugax, the emboli may only momentarily obstruct a vessel, such as the ciliary, ophthalmic, or retinal arteries. Amaurosis fugax can have numerous different causes, such as temporal arteritis and hypercoagulable conditions. It is crucial to keep in mind that individuals suffering with amaurosis fugax have a heightened likelihood of experiencing a stroke.
Pathophysiology
Amaurosis fugax is a temporary, unilateral blindness.
He has a number of risk factors, including hypertension, diabetes, hyperlipidemia, and tobacco use, which indicate the underlying problem of atherosclerosis.
LDL molecules accumulate and oxidize inside the vessel wall over time, triggering an inflammatory reaction. The oxidized LDL is phagocytosed by macrophages, resulting in foam cells that have the potential to burst and intensify inflammation. The vessel thickens as a result, forming a membrane to seal off the inflammatory process. This contributes to the physical examination finding of a carotid bruit by decreasing the luminal width of the vessel and increasing the velocity of blood flow through that location. Ruptures of the carotid atherosclerotic plaque have the potential to induce stroke by releasing emboli into the cerebral circulation. In the event of amaurosis fugax, the emboli may only momentarily obstruct a vessel, such as the ciliary, ophthalmic, or retinal arteries. Amaurosis fugax can have numerous different causes, such as temporal arteritis and hypercoagulable conditions. It is crucial to keep in mind that individuals suffering with amaurosis fugax have a heightened likelihood of experiencing a stroke.
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Pathology - Thromboembolic stroke in the cerebral arteries
Pathophysiology
Due to the high rate of stimulation, the left atrium in this condition is unable to contract completely, which causes blood stasis within the atrial and increases the risk of thrombus formation. Either the cerebral or peripheral circulation may become embolize by the thrombus. Characteristic clinical manifestations of cerebral artery occlusion correspond to the ischemia-affected brain areas. A large portion of the left lateral cerebral cortex, including the area involved in vocal expression, is supplied by the left middle cerebral artery. Aphasia, facial and extremity paralysis, and contralateral paralysis are all possible outcomes of local ischemia. Because Broca's area is involved in this instance, the patient has expressive aphasia; she can understand but cannot speak. Early in the course of a stroke, gaze deviation toward the side of the lesion is possible. Interestingly, this patient's CHADS2 score of 2 indicates that she probably did not have an atrial fibrillation diagnosis earlier because she is not using an anticoagulant. It's critical to identify these people very away and start treating them right away.
Sustaining elevated or standard blood pressure is crucial in order to stop more tissue ischemia.
Pathophysiology
Due to the high rate of stimulation, the left atrium in this condition is unable to contract completely, which causes blood stasis within the atrial and increases the risk of thrombus formation. Either the cerebral or peripheral circulation may become embolize by the thrombus. Characteristic clinical manifestations of cerebral artery occlusion correspond to the ischemia-affected brain areas. A large portion of the left lateral cerebral cortex, including the area involved in vocal expression, is supplied by the left middle cerebral artery. Aphasia, facial and extremity paralysis, and contralateral paralysis are all possible outcomes of local ischemia. Because Broca's area is involved in this instance, the patient has expressive aphasia; she can understand but cannot speak. Early in the course of a stroke, gaze deviation toward the side of the lesion is possible. Interestingly, this patient's CHADS2 score of 2 indicates that she probably did not have an atrial fibrillation diagnosis earlier because she is not using an anticoagulant. It's critical to identify these people very away and start treating them right away.
Sustaining elevated or standard blood pressure is crucial in order to stop more tissue ischemia.
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Pathology - Lacunar Infarcts
Pathophysiology
Hypertension is a significant risk factor for this illness, which can arise from obstruction of the perforating arteries that supply the interior structures of the brain. This disease's pathogenesis is caused by lipohyalinosis or microthrombi. Larger proximal arteries with atherosclerotic plaques are the source of microthrombi. The narrowing of tiny veins in lipohyalinosis is caused by either fibrinoid necrosis or inflammation and edema. Pure motor strokes are the most prevalent type of lacunar infarct syndrome, while there are five other types as well. The internal capsule, which contains fibers from the corticospinal tract that aid in voluntary movement, is involved in the paresis. Dysarthria may develop as a result of basal ganglia involvement. Similar to other forms of stroke, it's critical to keep in mind that maintaining cerebral perfusion is necessary to stop more ischemia in spite of the patient's elevated blood pressure.
Pathophysiology
Hypertension is a significant risk factor for this illness, which can arise from obstruction of the perforating arteries that supply the interior structures of the brain. This disease's pathogenesis is caused by lipohyalinosis or microthrombi. Larger proximal arteries with atherosclerotic plaques are the source of microthrombi. The narrowing of tiny veins in lipohyalinosis is caused by either fibrinoid necrosis or inflammation and edema. Pure motor strokes are the most prevalent type of lacunar infarct syndrome, while there are five other types as well. The internal capsule, which contains fibers from the corticospinal tract that aid in voluntary movement, is involved in the paresis. Dysarthria may develop as a result of basal ganglia involvement. Similar to other forms of stroke, it's critical to keep in mind that maintaining cerebral perfusion is necessary to stop more ischemia in spite of the patient's elevated blood pressure.
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Pathology - Major Depressive Disorder
Even though many psychiatric diagnoses have several criteria, it's crucial to first commit the time requirements and quantity of symptoms to memory. A minimum of two weeks must pass between the onset of one of the five symptoms of major depressive illness, which is either anhedonia (lack of interest) or a gloomy mood. The remaining nine symptoms include disturbed sleep, low energy, impaired concentration, feelings of guilt or worthlessness, altered appetite or weight, psychomotor agitation or retardation, and suicidal thoughts. The mnemonic SIG E CAPS is helpful.
A diagnosis of adjustment disorder could be made if the patient did not meet at least five criteria. This is because the patient's symptoms were brought on by a significant life stressor that started within three months of the stressor and did not last for longer than six months. A patient with dysthymic illness manifests a milder form of depression on more than half of their days for a duration exceeding two years.
Even though many psychiatric diagnoses have several criteria, it's crucial to first commit the time requirements and quantity of symptoms to memory. A minimum of two weeks must pass between the onset of one of the five symptoms of major depressive illness, which is either anhedonia (lack of interest) or a gloomy mood. The remaining nine symptoms include disturbed sleep, low energy, impaired concentration, feelings of guilt or worthlessness, altered appetite or weight, psychomotor agitation or retardation, and suicidal thoughts. The mnemonic SIG E CAPS is helpful.
A diagnosis of adjustment disorder could be made if the patient did not meet at least five criteria. This is because the patient's symptoms were brought on by a significant life stressor that started within three months of the stressor and did not last for longer than six months. A patient with dysthymic illness manifests a milder form of depression on more than half of their days for a duration exceeding two years.
