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Pathology - Severe Combined Immunodeficiency Disease
SCID occurs from a genetic abnormality in stem cells, resulting in absence of the thymus and T and B lymphocytes. In one-half of patients, an autosomal recessive transmission results in the loss of adenosine deaminase, an enzyme involved in purine catabolism. This leads in an accumulation of hazardous deoxyadenosine triphosphate, blocking ribonucleotide reductase and limiting DNA synthesis and therefore lymphocyte proliferation. In other cases, an X-linked transmission leads in absent gamma chain of the interleukin receptor, slowing lymphocyte growth due to issues with interleukin signaling. These patients will present with recurring bacterial, viral, parasite, and fungal infections at a relatively young age; however, maternal antibodies may delay commencement by a few months. Infections will become quite dangerous and include pneumonia, bacteremia, sepsis, and meningitis. Life span is often very short without treatment; however, early discovery and treatment with gene therapy and bone marrow transplantation can be curative.
SCID occurs from a genetic abnormality in stem cells, resulting in absence of the thymus and T and B lymphocytes. In one-half of patients, an autosomal recessive transmission results in the loss of adenosine deaminase, an enzyme involved in purine catabolism. This leads in an accumulation of hazardous deoxyadenosine triphosphate, blocking ribonucleotide reductase and limiting DNA synthesis and therefore lymphocyte proliferation. In other cases, an X-linked transmission leads in absent gamma chain of the interleukin receptor, slowing lymphocyte growth due to issues with interleukin signaling. These patients will present with recurring bacterial, viral, parasite, and fungal infections at a relatively young age; however, maternal antibodies may delay commencement by a few months. Infections will become quite dangerous and include pneumonia, bacteremia, sepsis, and meningitis. Life span is often very short without treatment; however, early discovery and treatment with gene therapy and bone marrow transplantation can be curative.
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Pathology - Allergic Rhinitis
This condition is characterized by a Type I (IgE-mediated) acute hypersensitivity reaction to environmental allergens. Patients will often have a personal or family history of other atopic diseases such as asthma or atopic dermatitis. The syndrome is marked by a predisposition to produce IgE antibodies to environmental antigens. As these antigens are filtered by the nasal airways, interaction with surface-bound IgE antibodies on mast cells and basophils triggers a release of preformed mediators and the de novo synthesis of additional mediators, as well as the creation and release of proinflammatory cytokines. Interaction of mediators induces a complicated reaction in target organs, which includes the release of histamine and other stored mediators in the initiation of a complex cascade of actions. Frequent or persistent exposure leads to mucus hypersecretion, IgE production, eosinophilia, and tissue damage. Patients will most usually appear with congestion, clear nasal discharge, pale or bluish nasal mucosa, and possibly infraorbital cyanosis. Nasal, ocular, and/or palate irritation can be present as well.
Extensive rubbing of the nose over an extended period of time can also lead to a characteristic transverse nasal crease.
A positive intracutaneous skin test can provide proof of triggering allergens.
This condition is characterized by a Type I (IgE-mediated) acute hypersensitivity reaction to environmental allergens. Patients will often have a personal or family history of other atopic diseases such as asthma or atopic dermatitis. The syndrome is marked by a predisposition to produce IgE antibodies to environmental antigens. As these antigens are filtered by the nasal airways, interaction with surface-bound IgE antibodies on mast cells and basophils triggers a release of preformed mediators and the de novo synthesis of additional mediators, as well as the creation and release of proinflammatory cytokines. Interaction of mediators induces a complicated reaction in target organs, which includes the release of histamine and other stored mediators in the initiation of a complex cascade of actions. Frequent or persistent exposure leads to mucus hypersecretion, IgE production, eosinophilia, and tissue damage. Patients will most usually appear with congestion, clear nasal discharge, pale or bluish nasal mucosa, and possibly infraorbital cyanosis. Nasal, ocular, and/or palate irritation can be present as well.
Extensive rubbing of the nose over an extended period of time can also lead to a characteristic transverse nasal crease.
A positive intracutaneous skin test can provide proof of triggering allergens.
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Pathology - Bruton's Agammaglobulinemia
Bruton’s agammaglobulinemia is an X-linked recessive illness caused by loss of a tyrosine kinase (Btk) gene, leading in the failure of pre-B cells to grow into mature B cells. All patients will be male and typically begin presenting with illnesses around about 6 months of age, when maternal antibody protection ends. Recurrent febrile sinopulmonary infections owing to pneumococcus and Haemophilus are prevalent. Patients may be noticed to have absent tonsils, as in this example, due to lack of lymphoproliferative germinal centers. Laboratory investigations will show absence of B cells on peripheral smear, and immunoglobulin electrophoresis will demonstrate a severely reduced immunoglobulin level, usually at 10% or less of the normal value.
Bruton’s agammaglobulinemia is an X-linked recessive illness caused by loss of a tyrosine kinase (Btk) gene, leading in the failure of pre-B cells to grow into mature B cells. All patients will be male and typically begin presenting with illnesses around about 6 months of age, when maternal antibody protection ends. Recurrent febrile sinopulmonary infections owing to pneumococcus and Haemophilus are prevalent. Patients may be noticed to have absent tonsils, as in this example, due to lack of lymphoproliferative germinal centers. Laboratory investigations will show absence of B cells on peripheral smear, and immunoglobulin electrophoresis will demonstrate a severely reduced immunoglobulin level, usually at 10% or less of the normal value.
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Pathology - IgA Deficiency
IgA deficiency is a frequent genetic condition causing varying hypogammaglobulinemia. Patients may acquire a hypogammaglobulinemia at any age and may be asymptomatic. The condition develops when the respective immunoglobulin-producing B cells fail to mature into plasma cells. Patients have normal B cell numbers, but measurably reduced amounts of one particular kind of immunoglobulin. This instance depicts the classic symptomatic patient. Deficiency in secretory IgA (immunoglobulin A) at very low levels results in recurrent sinopulmonary and, most notably, Giardia infections. This patient is considerably dehydrated on physical examination, which can occur following considerable fluid loss from giardiasis. It is also important to recognize that anaphylaxis can occur if an IgAdeficient patient is exposed to blood products that contain IgA, which may be the first recognition of previously asymptomatic IgA-deficient adult. In addition, patients have elevated rates of allergy and autoimmune illnesses.
A similar presentation in an adult patient with decreased levels of numerous immunoglobulins (as opposed to a single immunoglobulin deficiency in IgA deficiency) is mixed variable immunodeficiency, from a failure in B-cell maturation to plasma cells.
IgA deficiency is a frequent genetic condition causing varying hypogammaglobulinemia. Patients may acquire a hypogammaglobulinemia at any age and may be asymptomatic. The condition develops when the respective immunoglobulin-producing B cells fail to mature into plasma cells. Patients have normal B cell numbers, but measurably reduced amounts of one particular kind of immunoglobulin. This instance depicts the classic symptomatic patient. Deficiency in secretory IgA (immunoglobulin A) at very low levels results in recurrent sinopulmonary and, most notably, Giardia infections. This patient is considerably dehydrated on physical examination, which can occur following considerable fluid loss from giardiasis. It is also important to recognize that anaphylaxis can occur if an IgAdeficient patient is exposed to blood products that contain IgA, which may be the first recognition of previously asymptomatic IgA-deficient adult. In addition, patients have elevated rates of allergy and autoimmune illnesses.
A similar presentation in an adult patient with decreased levels of numerous immunoglobulins (as opposed to a single immunoglobulin deficiency in IgA deficiency) is mixed variable immunodeficiency, from a failure in B-cell maturation to plasma cells.
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Pathology - Urge Urinary Incontinence
This ailment, also known as “overactive bladder” is characterized by leakage of pee because of the inability to defer voiding after sensing sense of bladder fullness (urinary urgency). Most prevalent etiology is motor or sensory instability (bladder spasms or contractions) of the detrusor muscle of the urine bladder. This instability can be connected with local genitourinary problems (UTIs, tumors, outflow obstruction) or CNS disorders (stroke, Parkinsonism, spinal cord injury, or disease); however, in most cases, no explanation can be determined. Evaluation of this condition should include evaluation for UTI or other diseases as well as functional testing of the bladder (urodynamic testing). Treatment with behavioral therapies or anticholinergic medication to relax bladder musculature is generally highly helpful. The patient in the vignette is taking hydrochlorothiazide to manage her hypertension — this diuretic medicine may be unwittingly contributing to her symptoms.
This ailment, also known as “overactive bladder” is characterized by leakage of pee because of the inability to defer voiding after sensing sense of bladder fullness (urinary urgency). Most prevalent etiology is motor or sensory instability (bladder spasms or contractions) of the detrusor muscle of the urine bladder. This instability can be connected with local genitourinary problems (UTIs, tumors, outflow obstruction) or CNS disorders (stroke, Parkinsonism, spinal cord injury, or disease); however, in most cases, no explanation can be determined. Evaluation of this condition should include evaluation for UTI or other diseases as well as functional testing of the bladder (urodynamic testing). Treatment with behavioral therapies or anticholinergic medication to relax bladder musculature is generally highly helpful. The patient in the vignette is taking hydrochlorothiazide to manage her hypertension — this diuretic medicine may be unwittingly contributing to her symptoms.
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Pathology - Overflow Urinary Incontinence
This ailment happens due to involuntary loss of urine from an overly full bladder, which has some form of outlet obstruction. Common causes of this form of incontinence include BPH, prostate cancer, urethral narrowing/strictures, or neuromuscular diseases that impede bladder motility (spinal cord lesions, multiple sclerosis). In overflow incontinence, the bladder is always continually full so that it regularly leaks urine. Difficulty beginning urination and weakening of urine stream are typically noted as the inflated urinary bladder becomes functionally atonic or at least significantly less able to contract than normal bladder musculature. The condition may be worsened by usage of anticholinergic medicines or even NSAIDs, which may impede bladder motility further.
Presence of a considerable volume of pee in the bladder after voiding (either by ultrasound assessment or urinary catheterization) is indicative of this disorder. Lower abdominal distention is detected as the patient’s enlarged bladder moves from the pelvis into the lower abdomen.
This ailment happens due to involuntary loss of urine from an overly full bladder, which has some form of outlet obstruction. Common causes of this form of incontinence include BPH, prostate cancer, urethral narrowing/strictures, or neuromuscular diseases that impede bladder motility (spinal cord lesions, multiple sclerosis). In overflow incontinence, the bladder is always continually full so that it regularly leaks urine. Difficulty beginning urination and weakening of urine stream are typically noted as the inflated urinary bladder becomes functionally atonic or at least significantly less able to contract than normal bladder musculature. The condition may be worsened by usage of anticholinergic medicines or even NSAIDs, which may impede bladder motility further.
Presence of a considerable volume of pee in the bladder after voiding (either by ultrasound assessment or urinary catheterization) is indicative of this disorder. Lower abdominal distention is detected as the patient’s enlarged bladder moves from the pelvis into the lower abdomen.
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Pathology - Stress Urinary Incontinence
This involuntary leakage of pee happens as a result of loss of pelvic floor muscles or a weakening of the wall between the bladder and vagina. The average adult bladder can retain 350 to 550 mL of pee and is maintained by pelvic floor musculature. Primary pelvic musculature involved in this condition includes the urethral sphincter muscle and detrusor muscle of the bladder wall. Weakness often arises as one sequelae of pregnancy/childbirth and/or menopause loss of estrogen support to vaginal tissues. In stress incontinence, the urinary sphincter muscle is not able to prevent urine from flowing when pressure (e.g., coughing, laughing, sneezing) is exerted on the abdomen. Diagnosis of this ailment may entail ultrasound assessment of the bladder, cystoscopy, urinalysis, and bladder stress test.
This involuntary leakage of pee happens as a result of loss of pelvic floor muscles or a weakening of the wall between the bladder and vagina. The average adult bladder can retain 350 to 550 mL of pee and is maintained by pelvic floor musculature. Primary pelvic musculature involved in this condition includes the urethral sphincter muscle and detrusor muscle of the bladder wall. Weakness often arises as one sequelae of pregnancy/childbirth and/or menopause loss of estrogen support to vaginal tissues. In stress incontinence, the urinary sphincter muscle is not able to prevent urine from flowing when pressure (e.g., coughing, laughing, sneezing) is exerted on the abdomen. Diagnosis of this ailment may entail ultrasound assessment of the bladder, cystoscopy, urinalysis, and bladder stress test.
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Pathology - Functional Urinary Incontinence
This problem arises when a person senses the desire to urinate but cannot make it to the bathroom. The urine loss may be substantial. This disorder is widespread in elderly adults - for this reason, physiologic reasons of incontinence must be ruled out in order to achieve this diagnosis. The patient in the vignette has been evaluated for UTI and constipation, frequent causes of incontinence in this age group. His condition coincides with transferring to a facility where it is quite likely that he is not granted bathroom access as often as needed. Causes of functional incontinence include confusion; dementia; poor eyesight; poor mobility; poor dexterity; unwillingness to toilet because of melancholy, anxiety, or rage; alcoholism; or being in a setting in which it is hard to reach a toilet. Examples include someone in a wheelchair or with dementia. Patients with functional incontinence may have issues thinking, moving, or communicating that prevent them from reaching a toilet. The term “functional” denotes that the disease is not related to anatomic or physiologic dysfunction but rather to emotional or access/mobility concerns.
This problem arises when a person senses the desire to urinate but cannot make it to the bathroom. The urine loss may be substantial. This disorder is widespread in elderly adults - for this reason, physiologic reasons of incontinence must be ruled out in order to achieve this diagnosis. The patient in the vignette has been evaluated for UTI and constipation, frequent causes of incontinence in this age group. His condition coincides with transferring to a facility where it is quite likely that he is not granted bathroom access as often as needed. Causes of functional incontinence include confusion; dementia; poor eyesight; poor mobility; poor dexterity; unwillingness to toilet because of melancholy, anxiety, or rage; alcoholism; or being in a setting in which it is hard to reach a toilet. Examples include someone in a wheelchair or with dementia. Patients with functional incontinence may have issues thinking, moving, or communicating that prevent them from reaching a toilet. The term “functional” denotes that the disease is not related to anatomic or physiologic dysfunction but rather to emotional or access/mobility concerns.
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Pathology - Male Hypogonadism
The disorder is caused by insufficient testosterone release from the testes. Congenital causes of male hypogonadism include the chromosomal abnormalities Klinefelter’s syndrome (47, XXY plus variants) and mutations such as those in Kallmann syndrome that result in the loss of GnRH secreting neurons. The patient in this example has a past history of normal fertility, indicating he has an acquired etiology of hypogonadism.
Inadequate testosterone levels account for loss of libido, erectile dysfunction, decreased muscle mass, weariness, and depression. Severe chronic cases may also result in loss of facial, body, and pubic hair. The condition can be classified as hypogonadotropic (normal or low LH, as in this example) or hypergonadotropic (high LH due to primary testicular failure and loss of negative feedback on LH secretion). This patient has no clear identifiable cause of hypogonadism such as pituitary disease, hypothyroidism, granulomatous disease, or adverse drug reaction but rather has a functional reason related to obesity, aging, and chronic ill health. Testosterone levels normally fall 1–2% every year at the age of 40 years and the aromatase activity of adipose tissue converts testosterone to estrogen. Testosterone replacement usually restores virility, but its usage must be balanced against the increased risk of cardiovascular events, and it should not be used while active prostate cancer is present.
The disorder is caused by insufficient testosterone release from the testes. Congenital causes of male hypogonadism include the chromosomal abnormalities Klinefelter’s syndrome (47, XXY plus variants) and mutations such as those in Kallmann syndrome that result in the loss of GnRH secreting neurons. The patient in this example has a past history of normal fertility, indicating he has an acquired etiology of hypogonadism.
Inadequate testosterone levels account for loss of libido, erectile dysfunction, decreased muscle mass, weariness, and depression. Severe chronic cases may also result in loss of facial, body, and pubic hair. The condition can be classified as hypogonadotropic (normal or low LH, as in this example) or hypergonadotropic (high LH due to primary testicular failure and loss of negative feedback on LH secretion). This patient has no clear identifiable cause of hypogonadism such as pituitary disease, hypothyroidism, granulomatous disease, or adverse drug reaction but rather has a functional reason related to obesity, aging, and chronic ill health. Testosterone levels normally fall 1–2% every year at the age of 40 years and the aromatase activity of adipose tissue converts testosterone to estrogen. Testosterone replacement usually restores virility, but its usage must be balanced against the increased risk of cardiovascular events, and it should not be used while active prostate cancer is present.
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Pathology - Erectile Dysfunction
Two mediators in penile tumescence are nitric oxide (NO) and cyclic guanosine monophosphate (GMP). Tactile stimulation of the penis leads in the firing of neurons that transfer impulses based on feeling. This produces secretion of NO which has a vasodilatory effect, allowing corpora cavernosa to engorge with blood. Cyclic GMP also has a vasodilatory impact. Disorders that alter brain function, such diabetes, can influence a patient’s ability to obtain an erection. There are various more factors that can cause erectile dysfunction that should be considered: psychogenic disorders, drug use, vasculopathy, and endocrine abnormalities. With psychogenic difficulties, patients still tend to have morning tumescence after waking from REM sleep. The current gold standard treatment is oral phosphodiesterase inhibitors, which function by inhibiting the breakdown of cyclic GMP.
Two mediators in penile tumescence are nitric oxide (NO) and cyclic guanosine monophosphate (GMP). Tactile stimulation of the penis leads in the firing of neurons that transfer impulses based on feeling. This produces secretion of NO which has a vasodilatory effect, allowing corpora cavernosa to engorge with blood. Cyclic GMP also has a vasodilatory impact. Disorders that alter brain function, such diabetes, can influence a patient’s ability to obtain an erection. There are various more factors that can cause erectile dysfunction that should be considered: psychogenic disorders, drug use, vasculopathy, and endocrine abnormalities. With psychogenic difficulties, patients still tend to have morning tumescence after waking from REM sleep. The current gold standard treatment is oral phosphodiesterase inhibitors, which function by inhibiting the breakdown of cyclic GMP.
