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Fetal Scalp Stimulation

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161. Normal Labor and Delivery (Treatment)

be accomplished with blood sampling from fetal scalp capillaries. This procedure allows for a direct assessment of fetal oxygenation and blood pH. A pH of < 7.20 warrants further investigation for the fetus' well-being and for possible resuscitation or surgical intervention. Routine laboratory studies of the parturient, such as complete blood cell (CBC) count, blood typing and screening, and urinalysis, are usually performed. Intravenous (IV) access is established. Previous Next: Intrapartum Management (...) , in an attempt to avoid shoulder dystocia, deliver the anterior shoulder prior to restitution of the fetal head. Next, the fetus' anterior shoulder is delivered with gentle downward traction on its head and chin. Subsequent upward pressure in the opposite direction facilitates delivery of the posterior shoulder. The rest of the fetus should now be easily delivered with gentle traction away from the mother. If not done previously, the cord is clamped and cut. The baby is vigorously stimulated and dried

2014 eMedicine.com

162. Paraneoplastic Diseases (Overview)

have papillomatous thickening of the oral mucosa. Patients who have AN associated with malignancies also have skin changes involving the scalp, areolae, and eyelids. The appearance of paraneoplastic AN usually coincides with the presence of malignancy, but it can precede or follow the diagnosis of cancer and thus may signal a relapse in patients with a history of cancer. Diagnosis The diagnosis of AN is based on clinical findings alone and can be supported by the histopathologic changes (...) include symmetrical, scaly, violaceous plaques on the acral surfaces, with severe forms progressing to bullae. The lesions predominantly occur on the hands, feet, ear helices, nose tip, and scalp. Skin changes may spread to involve the knees, elbows, and malar surface of the face. [ ] Bazex syndrome occurs more commonly in men older than 40 years. [ ] Alopecia and nail changes are common and can be early findings. Subungual hyperkeratosis, onychodystrophy, and white flaking of the nail surface

2014 eMedicine.com

163. Platelet Disorders (Overview)

the presence of petechiae and ecchymoses. The presence of lymphadenopathy or suggests other secondary causes of thrombocytopenia rather than ITP. The peripheral smear shows a decreased number of platelets. Often, the smear shows giant platelets, which is a reflection of increased thrombopoietin-induced stimulation of the bone marrow (see images below). Examination of the peripheral smears in immune thrombocytopenic purpura often shows giant platelets. These platelets reflect the increased megakaryocytic (...) mass in the marrow. Peripheral smear of a patient with Bernard-Soulier syndrome showing giant platelets. These platelets are not counted as platelets in most particle counters. At times, the smear may show eosinophilia and lymphocytosis, possibly reflecting hypersensitivity to the inciting viral antigens. The bone marrow shows an increase in the number of megakaryocytes and signs of thrombopoietin-induced megakaryocyte stimulation (increase in number and ploidy, decrease in cytoplasm), resulting

2014 eMedicine.com

164. Preoperative Evaluation and Management (Overview)

, can cause bone growth retardation and staining of dental enamel in the fetus. Lidocaine also appears to be safe in low doses, although excessive amounts can cause fetal CNS and cardiac depression. Acetaminophen (Class B) is routinely used during pregnancy despite its ability to cross the placenta. [ ] Drugs should also be selected carefully during lactation. [ ] Snoring/sleep apnea Eighty percent of patients with breathing problems related to sleep disorders are male. Conscious sedation may (...) controlled, and the insulin doses should be adjusted as needed. Management of hypoglycemic agents and different types of insulin can be pivotal. [ ] Hypertension A history of hypertension should alert the physician to check the patient's blood pressure. Patients with elevated pressures may bleed profusely. This is especially true when working on larger areas of the body or in highly vascular regions, such as the scalp. Hypertension is an important cause of perioperative bleeding and hematoma formation

2014 eMedicine.com

165. Postterm Pregnancy (Overview)

be reviewed. Finally, intrapartum fetal surveillance in an attempt to document fetal intolerance to labor before it leads to acidosis is critical. Whether continuous fetal monitoring or intermittent auscultation is used, interpretation of the results by a well-trained clinician is of paramount importance. If the fetal heart rate tracing is equivocal, fetal scalp stimulation and/or fetal scalp blood sampling may provide the reassurance necessary to justify continuing the induction of labor (...) of a positive human chorionic gonadotropin (+hCG) test finding, 20 weeks of fetal heart tones have been established by a fetoscope or 30 weeks by a Doppler examination, or 39 weeks' gestation have been established by a CRL or by an ultrasound performed before 20 weeks of gestation consistent with dates by the patient's LMP. Perinatal outcomes in postterm pregnancies Recent studies have shown that the risks to the fetus [ , , , , , , , , , , , , ] and to the mother [ , , , , , , , ] of continuing

2014 eMedicine.com

166. Surgical Treatment of Tremor (Treatment)

, dopaminergic) The target area is well defined (ie, striatum) Postsynaptic receptors are relatively intact The neurons provide tonic stimulation of the receptors and appear to serve a modulatory function In double-blind studies, neither transplantation of autologous adrenal medullary cells nor transplantation of fetal porcine cells has been found to be effective; both have been abandoned. Although open-label studies of fetal dopaminergic cell transplantation yielded promising results, 3 randomized, double (...) physiologically. Medtronics Activa Tremor control system consists of 3 components: (1) stimulating lead, which is implanted to desired target; (2) extension cable, which is tunneled under scalp and soft tissues of neck to anterior chest wall; and (3) pulse generator, which is programmable source of electrical impulses. Stereotactic headframe is applied at start of surgery. MRI-localizing box is attached to frame only during targeting MRI. Localizer defines working volume of frame and provides reference

2014 eMedicine.com

167. Surgical Treatment of Parkinson Disease (Treatment)

, dopaminergic) The target area is well defined (ie, striatum) Postsynaptic receptors are relatively intact The neurons provide tonic stimulation of the receptors and appear to serve a modulatory function In double-blind studies, neither transplantation of autologous adrenal medullary cells nor transplantation of fetal porcine cells has been found to be effective; both have been abandoned. Although open-label studies of fetal dopaminergic cell transplantation yielded promising results, 3 randomized, double (...) physiologically. Medtronics Activa Tremor control system consists of 3 components: (1) stimulating lead, which is implanted to desired target; (2) extension cable, which is tunneled under scalp and soft tissues of neck to anterior chest wall; and (3) pulse generator, which is programmable source of electrical impulses. Stereotactic headframe is applied at start of surgery. MRI-localizing box is attached to frame only during targeting MRI. Localizer defines working volume of frame and provides reference

2014 eMedicine.com

168. Teratology and Drug Use During Pregnancy (Treatment)

, have performed many studies in this area. Specific drugs should be investigated before they are used. Risk-benefit assessment and counseling should involve the patient in the setting of her current state of health. The physician must consider the effects of drug exposure on the developing fetus or embryo and acknowledge specific susceptibilities at each point in fetal development, as balanced against the risks of worsening maternal illness. The patient must consider her symptoms, quality of life (...) exposures may alter the size, shape, performance, and production of sperm. This observation suggests that drug exposure in the male may put the fetus at risk. Animal studies have shown that paternal teratogenic exposure may lead to pregnancy loss or failure of the embryo to develop. However, unlike teratogenic agents taken by pregnant woman, teratogenic agents affecting the father do not seem to directly interfere with normal fetal development. Animal studies show that paternal teratogenic exposure may

2014 eMedicine.com

169. Local Anesthesia and Regional Nerve Block Anesthesia (Overview)

in the form of an outward flux, accounting for the negative resting potential. The recently identified 2-pore domain potassium (K2P) channels are believed to be responsible for leak K + currents. When a nerve is stimulated, depolarization of the nerve occurs, and impulse propagation progresses. Initially, sodium ions gradually enter the cell through the nerve cell membrane. The entry of sodium ions causes the transmembrane electric potential to increase from the resting potential. Once the potential (...) episode in predisposed patients. The FDA designates epinephrine as a pregnancy category B medication (ie, usually safe but benefits must outweigh the risks). No known adverse effects on the fetus are reported; however, during the first trimester, vasoconstriction may cause fetoplacental ischemia and affect organogenesis. In the last trimester, epinephrine can induce premature labor if placental ischemia occurs. If possible, surgery should be performed without epinephrine, or it should be postponed

2014 eMedicine.com

170. Dermatologic Manifestations of Hematologic Disease (Overview)

criteria) for definite APS. The criteria, developed by consensus among international clinical and laboratory experts, were originally referred to in 1999 as the Sapporo criteria [ ] and then modified at a meeting in Sydney in 2006. [ ] The primary diagnostic criteria include arterial thrombosis, venous thrombosis, recurrent fetal loss, and thrombocytopenia. One of the listed primary criteria is required for diagnosis, combined with a sustained elevated titer of immunoglobulin G (IgG) anticardiolipin (...) . [ ] According to the Cooperative Study of Sickle Cell Disease, approximately 25% of patients with sickle cell disease in the United States have a history of active ulcers or developed ulcers during the 8 years of observation. The incidence is low in children younger than 10 years because of the protective effect of persistent fetal hemoglobin. Other risk factors for developing leg ulceration are anemia, male sex, combined HLA-B35 and HLA-Cw4, and antithrombin III deficiency. Based on clinical experience

2014 eMedicine.com

171. Dermatologic Manifestations of Cardiac Disease (Overview)

Clubbing (Hypertrophic Osteoarthropathy) Definition represents a localized drumsticklike swelling of the distal segments of fingers and toes, particularly over the extensor surface. It is caused by connective tissue proliferation leading to increases in the sponginess of the soft tissue at the base of the nails due to stimulation by a humoral substance that causes dilation of the vessels of the fingertip or toe tip. [ ] Differential diagnosis Clubbing, as illustrated below, is seen in persons (...) is observed in some infants born to mothers with . This may be due to various factors, such as fetal myocarditis, idiopathic hemorrhage and necrosis involving conduction tissue, degeneration and fibrosis related in some instances to the transplacental passage of anti-Ro/ss-A antibody, and other immune complexes from mothers. Neonatal lupus erythematosus and its dermatologic manifestations were reviewed by Neiman et al. [ ] They studied 47 mothers (83% white) whose sera contained anti-SSA/Ro, anti-SSB/La

2014 eMedicine.com

172. Benign Vulvar Lesions (Overview)

factor because lesions occur in areas of the skin where sebaceous glands are most active, such as the face, scalp, body folds, and, less commonly, the genitalia. Seborrheic dermatitis is commonly observed in neonates during the early months of life (as a result of sebaceous gland activation by maternal androgens) or after puberty. An association with Pityrosporum yeasts has been noted. Neurologic factors have also been thought to play a role; emotional stress, Parkinson disease, nerve injury (...) , and syringomyelia have been related to onset or worsening of the disease. Seasonal factors, zinc deficiency, and HIV infection have been linked to this disorder. Psoriasis Psoriasis is a hereditary disorder of the skin that affects approximately 2% of the population in the Western world. The characteristic silver-white scales on erythematous plaques are caused by rapid cell turnover and primarily occur in sites of repetitive trauma, such as the scalp, elbows, forearms, knees, hands, and feet. Rarely, vulvar

2014 eMedicine.com

173. Paraneoplastic Diseases (Follow-up)

have papillomatous thickening of the oral mucosa. Patients who have AN associated with malignancies also have skin changes involving the scalp, areolae, and eyelids. The appearance of paraneoplastic AN usually coincides with the presence of malignancy, but it can precede or follow the diagnosis of cancer and thus may signal a relapse in patients with a history of cancer. Diagnosis The diagnosis of AN is based on clinical findings alone and can be supported by the histopathologic changes (...) include symmetrical, scaly, violaceous plaques on the acral surfaces, with severe forms progressing to bullae. The lesions predominantly occur on the hands, feet, ear helices, nose tip, and scalp. Skin changes may spread to involve the knees, elbows, and malar surface of the face. [ ] Bazex syndrome occurs more commonly in men older than 40 years. [ ] Alopecia and nail changes are common and can be early findings. Subungual hyperkeratosis, onychodystrophy, and white flaking of the nail surface

2014 eMedicine.com

174. Postterm Pregnancy (Follow-up)

be reviewed. Finally, intrapartum fetal surveillance in an attempt to document fetal intolerance to labor before it leads to acidosis is critical. Whether continuous fetal monitoring or intermittent auscultation is used, interpretation of the results by a well-trained clinician is of paramount importance. If the fetal heart rate tracing is equivocal, fetal scalp stimulation and/or fetal scalp blood sampling may provide the reassurance necessary to justify continuing the induction of labor (...) of a positive human chorionic gonadotropin (+hCG) test finding, 20 weeks of fetal heart tones have been established by a fetoscope or 30 weeks by a Doppler examination, or 39 weeks' gestation have been established by a CRL or by an ultrasound performed before 20 weeks of gestation consistent with dates by the patient's LMP. Perinatal outcomes in postterm pregnancies Recent studies have shown that the risks to the fetus [ , , , , , , , , , , , , ] and to the mother [ , , , , , , , ] of continuing

2014 eMedicine.com

175. Preoperative Evaluation and Management (Follow-up)

, can cause bone growth retardation and staining of dental enamel in the fetus. Lidocaine also appears to be safe in low doses, although excessive amounts can cause fetal CNS and cardiac depression. Acetaminophen (Class B) is routinely used during pregnancy despite its ability to cross the placenta. [ ] Drugs should also be selected carefully during lactation. [ ] Snoring/sleep apnea Eighty percent of patients with breathing problems related to sleep disorders are male. Conscious sedation may (...) controlled, and the insulin doses should be adjusted as needed. Management of hypoglycemic agents and different types of insulin can be pivotal. [ ] Hypertension A history of hypertension should alert the physician to check the patient's blood pressure. Patients with elevated pressures may bleed profusely. This is especially true when working on larger areas of the body or in highly vascular regions, such as the scalp. Hypertension is an important cause of perioperative bleeding and hematoma formation

2014 eMedicine.com

176. Anabolic Steroid Use and Abuse (Overview)

present in females in small amounts. Due to the negative feedback system, the release of LH and FSH decline, leading to a decrease in estrogens and progesterone. AAS use by a pregnant woman can cause pseudohermaphroditism or virilization in the female fetus or may even cause fetal death. The American College of Obstetricians and Gynecologists (ACOG) includes anabolic steroids in the list for routine substance-abuse-disorder screening. Healthcare professionals are encouraged to address the use (...) negative feedback inhibition upon gonadotropin-releasing hormone (GnRH). Since GnRH stimulates follicle-stimulating hormone (FSH) and LH release in the pituitary, this negative feedback can be seen to inhibit subsequent testosterone production and effect spermatogenesis. Testosterone activity is mediated via an androgen receptor that is present in various tissues throughout the human body. Testosterone binds to an intracellular receptor found in the cytosol of cells, forming a receptor complex

2014 eMedicine.com

177. Basal Cell Carcinoma, Eyelid (Overview)

. [ ] The image below depicts BCC of the right lower lid. Basal cell carcinoma of the right lower lid. See , , and , Critical Images slideshows, to help correctly identify various lesions. Signs and symptoms Approximately 85% of BCCs occur on the face, head (scalp included), and neck; others appear on the trunk or extremities; rarely, they may occur on the hands. [ , ] Other characteristic features of BCC tumors include the following: Waxy papules with central depression Pearly appearance Erosion (...) tissues during fetal development. After embryogenesis, it continues to function in regulation of cell growth and differentiation. Loss of inhibition of this pathway is associated with human malignancy, including BCC. The hedgehog gene encodes an extracellular protein that binds to a cell membrane receptor complex to start a cascade of cellular events leading to cell proliferation. Of the 3 known human homologues, sonic hedgehog (SHH) protein is the most relevant to BCC. Patched (PTCH) is a protein

2014 eMedicine.com

178. Basal Cell Carcinoma (Overview)

. [ ] The image below depicts BCC of the right lower lid. Basal cell carcinoma of the right lower lid. See , , and , Critical Images slideshows, to help correctly identify various lesions. Signs and symptoms Approximately 85% of BCCs occur on the face, head (scalp included), and neck; others appear on the trunk or extremities; rarely, they may occur on the hands. [ , ] Other characteristic features of BCC tumors include the following: Waxy papules with central depression Pearly appearance Erosion (...) tissues during fetal development. After embryogenesis, it continues to function in regulation of cell growth and differentiation. Loss of inhibition of this pathway is associated with human malignancy, including BCC. The hedgehog gene encodes an extracellular protein that binds to a cell membrane receptor complex to start a cascade of cellular events leading to cell proliferation. Of the 3 known human homologues, sonic hedgehog (SHH) protein is the most relevant to BCC. Patched (PTCH) is a protein

2014 eMedicine.com

179. Basal Cell Carcinoma (Overview)

. [ ] The image below depicts BCC of the right lower lid. Basal cell carcinoma of the right lower lid. See , , and , Critical Images slideshows, to help correctly identify various lesions. Signs and symptoms Approximately 85% of BCCs occur on the face, head (scalp included), and neck; others appear on the trunk or extremities; rarely, they may occur on the hands. [ , ] Other characteristic features of BCC tumors include the following: Waxy papules with central depression Pearly appearance Erosion (...) tissues during fetal development. After embryogenesis, it continues to function in regulation of cell growth and differentiation. Loss of inhibition of this pathway is associated with human malignancy, including BCC. The hedgehog gene encodes an extracellular protein that binds to a cell membrane receptor complex to start a cascade of cellular events leading to cell proliferation. Of the 3 known human homologues, sonic hedgehog (SHH) protein is the most relevant to BCC. Patched (PTCH) is a protein

2014 eMedicine.com

180. Platelet Disorders (Follow-up)

the presence of petechiae and ecchymoses. The presence of lymphadenopathy or suggests other secondary causes of thrombocytopenia rather than ITP. The peripheral smear shows a decreased number of platelets. Often, the smear shows giant platelets, which is a reflection of increased thrombopoietin-induced stimulation of the bone marrow (see images below). Examination of the peripheral smears in immune thrombocytopenic purpura often shows giant platelets. These platelets reflect the increased megakaryocytic (...) mass in the marrow. Peripheral smear of a patient with Bernard-Soulier syndrome showing giant platelets. These platelets are not counted as platelets in most particle counters. At times, the smear may show eosinophilia and lymphocytosis, possibly reflecting hypersensitivity to the inciting viral antigens. The bone marrow shows an increase in the number of megakaryocytes and signs of thrombopoietin-induced megakaryocyte stimulation (increase in number and ploidy, decrease in cytoplasm), resulting

2014 eMedicine.com

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