scholarly journals Acute Hepatic Porphyria: Pathophysiological Basis of Neuromuscular Manifestations

2021 ◽  
Vol 15 ◽  
Author(s):  
Paulo Victor Sgobbi de Souza ◽  
Bruno de Mattos Lombardi Badia ◽  
Igor Braga Farias ◽  
Wladimir Bocca Vieira de Rezende Pinto ◽  
Acary Souza Bulle Oliveira

Acute hepatic porphyria represents a rare, underdiagnosed group of inherited metabolic disorders due to hereditary defects of heme group biosynthesis pathway. Most patients have their definite diagnosis after several years of complex and disabling clinical manifestations and commonly after life-threatening acute neurovisceral episodes or severe motor handicap. Many key studies in the last two decades have been performed and led to the discovery of novel possible diagnostic and prognostic biomarkers and to the development of new therapeutic purposes, including small interfering RNA-based therapy, specifically driven to inhibit selectively delta-aminolevulinic acid synthase production and decrease the recurrence number of severe acute presentation for most patients. Several distinct mechanisms have been identified to contribute to the several neuromuscular signs and symptoms. This review article aims to present the current knowledge regarding the main pathophysiological mechanisms involved with the acute and chronic presentation of acute hepatic porphyria and to highlight the relevance of such content for clinical practice and in decision making about therapeutic options.

Author(s):  
Paulo Victor Sgobbi de Souza ◽  
Bruno de Mattos Lombardi Badia ◽  
Igor Braga Farias ◽  
Eduardo Augusto Gonçalves ◽  
Wladimir Bocca Vieira de Rezende Pinto ◽  
...  

ABSTRACT Background: Acute hepatic porphyrias represent an expanding group of complex inherited metabolic disorders due to inborn errors of metabolism involving heme biosynthesis. Objective: We aimed to review the main clinical and therapeutic aspects associated with acute hepatic porphyrias. Methods: The authors provided a wide non-systematic review of current concepts and recently acquired knowledge about acute hepatic porphyrias. Results: Acute neurovisceral attacks are the most common and life-threatening presentation of this group and are often considered the main clinical manifestation by clinicians during differential diagnosis and the start of proper diagnostic work-up for acute porphyrias. However, atypical presentations with central nervous system involvement, neuropsychiatric disturbances, and some subtypes with photosensitivity usually make the definite diagnosis difficult and late. Early therapeutic interventions are essential during emergency treatment and intercritical periods to avoid recurrent severe presentations. The availability of new disease-modifying therapeutic proposals based on small interfering RNA (siRNA)-based therapies, complementary to the classic intravenous glucose infusion and hemin-based treatments, emphasizes the importance of early diagnosis and genetic counseling of patients. Conclusions: This review article highlights the main biochemical, pathophysiological, clinical, and therapeutic aspects of acute hepatic porphyrias in clinical practice.


2010 ◽  
Vol 4 (1) ◽  
pp. 3-18 ◽  
Author(s):  
Chakrapol Sriaroon ◽  
John N. Greene ◽  
Albert L. Vincent ◽  
Veronica T. Tucci ◽  
Mohamed A. Kharfan-Dabaja ◽  
...  

Abstract Background: BK virus infection is common but is usually asymptomatic. However, it can become life threatening as severe hemorrhagic cystitis (HC) or the polyomavirus-associated nephropathy (PVAN) particularly in immune compromised and transplant recipients. Some investigators have studied the pathophysiology and there are anecdotal and uncontrolled studies of therapy with few conclusions allowing treatment guidelines. Objectives: Summarize literature review of current knowledge concerning the nature, epidemiology, pathophysiology, diagnosis and treatment of this common virus infection. Results: HC is a not uncommon and often misdiagnosed infection from BK virus. It is usually self limited but can become life threatening in immune compromised patients. PVAN threatens survival of transplanted kidneys and is difficult to differentiate from rejection without sophisticated molecular diagnostic technology. We have sufficient information for making a diagnosis of BK virus disease by using clinical, serological and molecular technology. Studies using manipulation of immunosuppression and a variety of antiviral agents, including cidofovir, leflunomide, intravenous immunoglobulin, vidarabine, fluroquinolones, have been published but most were uncontrolled reports of few cases. Cidofovir offers some promise but more must be learned before there is hope for evidence-based treatment guidelines.


2020 ◽  
Vol 12 (1) ◽  
pp. e2020042
Author(s):  
Giuseppe Lassandro ◽  
Valentina  Palladino ◽  
Anna Amoruso ◽  
Viviana Palmieri ◽  
Giovanna Russo ◽  
...  

Human coronaviruses (HCoVs) commonly cause mild upper-respiratory tract illnesses but can lead to more severe and diffusive diseases. A variety of signs and symptoms may be present, and infections can range in severity from common cold and sore throat to more serious laryngeal or tracheal infections, bronchitis, and pneumonia. Among the seven coronaviruses that affect humans, (SARS)-CoV, the Middle East respiratory syndrome (MERS)-CoV and the most recent coronavirus disease 2019 (COVID-19) represent potential life-threatening diseases worldwide. In adults they may cause severe pneumonia that evolve in distress respiratory syndrome and multiorgan failure with a high mortality rate. Children appear to be less susceptible to develop severe clinical disease and present usually with mild and aspecific symptoms similar to other respiratory infections typical of childhood. However, some children such as infants, adolescents or those with underlying diseases may be more at-risk categories and require greater caution from clinicians. Available data on pediatric coronavirus infections are rare and scattered in the literature. The purpose of this review is to provide to clinicians a complete and updated panel useful to recognize and characterize the broad spectrum of clinical manifestations of coronavirus infections in the pediatric age.


2020 ◽  
Vol 70 (6) ◽  
pp. 1616-21
Author(s):  
Ayesha Batool ◽  
Saeed Zaman ◽  
Ammara Ayub ◽  
Kulsum Bilal ◽  
Qudratullah Malik

Objective:  To determine the frequency of a wide range of clinical presentations of inherited metabolic disorders diagnosed in infants and children at a tertiary care hospital in Rawalpindi, Pakistan. Study Design: Cross sectional study Place and Duration of Study: MH Rawalpindi, from June 2015 till June 2016. Material and Methods:  64 children diagnosed with metabolic disorders, reporting to the MH Rawalpindi, were enrolled in the study. History was taken with special reference to family history, consanguineous marriage, sibling’s death and clinical manifestations. Thorough physical examination was done in every patient to find out the clinical signs present. All the data was recorded on a proforma. SPSS-20 version was used to derive the results and p-value of <0.05 was taken as statistically significant. Results: In children with metabolic disorders, gastrointestinal manifestations were more significant 78·1% (p-value 0.022). Neurological signs were present in 60·9% (p-value 0.094) while respiratory manifestations were present in 15·6% children (p-value 0.251). 53·1% were males and 46·9% were females. The positive history of other affected children in family was significant (p-value 0.015), along with hypoglycaemia (p-value 0.001). Conclusion:  Pallor, failure to thrive, poor feeding, convulsions, lethargy and hypoglycemia were the most frequent clinical manifestations in children with metabolic disorders.


Life ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 344
Author(s):  
Valentina Giudice ◽  
Carmine Vecchione ◽  
Carmine Selleri

Chemotherapy-related cardiac dysfunction, also known as cardiotoxicity, is a group of drug-related adverse events negatively affecting myocardial structure and functions in patients who received chemotherapy for cancer treatment. Clinical manifestations can vary from life-threatening arrythmias to chronic conditions, such as heart failure or hypertension, which dramatically reduce quality of life of cancer survivors. Standard chemotherapy exerts its toxic effect mainly by inducing oxidative stress and genomic instability, while new targeted therapies work by interfering with signaling pathways important not only in cancer cells but also in myocytes. For example, Bruton’s tyrosine kinase (BTK) inhibitors interfere with class I phosphoinositide 3-kinase isoforms involved in cardiac hypertrophy, contractility, and regulation of various channel forming proteins; thus, off-target effects of BTK inhibitors are associated with increased frequency of arrhythmias, such as atrial fibrillation, compared to standard chemotherapy. In this review, we summarize current knowledge of cardiotoxic effects of targeted therapies used in hematology.


2019 ◽  
Vol 40 (06) ◽  
pp. 715-726 ◽  
Author(s):  
Christelle Bergeron ◽  
André M. Cantin

AbstractCystic fibrosis (CF) is a common, life-threatening, multisystemic, autosomal recessive disorder. In the last few years, giant steps have been made with regard to the understanding of CF pathophysiology, allowing the scientific community to propose mechanisms that cause the myriad of CF clinical manifestations. Following the discovery of the cystic fibrosis transmembrane conductance regulator (CFTR) gene in 1989, the structure and function of the CFTR protein were described. Since then, more than 2,000 variants of the CFTR gene and their impact on the amount and function of the CFTR protein have been reported. The role of the CFTR protein as an ion channel transporting chloride and bicarbonate and its repercussions on different epithelial cell-lined organs and mucus are now better understood. Mechanisms behind susceptibility to infection in CF have also been proposed and include abnormalities in the composition, volume and acidity of the airway surface liquid, changes in the submucosal gland's anatomy and function, and deficiencies in the mucociliary clearance system. Numerous hypotheses explaining the excessive inflammatory response in CF are also debated and involve impaired mucociliary clearance, persistent hypoxia, lipid abnormalities, protease and antiprotease disproportion, and oxidant and antioxidant imbalance. The purpose of this review is to summarize our current knowledge of CF pathophysiology, including significant historic discoveries and most recent breakthroughs, and to improve understanding and awareness of this fatal disease.


2021 ◽  
Vol 15 (4) ◽  
pp. e0009355
Author(s):  
Wan-Hsiu Yang ◽  
Meng-Shiuan Hsu ◽  
Pei-Yun Shu ◽  
Kun-Hsien Tsai ◽  
Chi-Tai Fang

Background Current knowledge on Rickettsia felis infection in humans is based on sporadic case reports. Here we conducted a retrospective seroepidemiological survey of R. felis infection among febrile patients visiting a medical center in Taipei. Methodology/Principal findings A total of 122 patients with suspected rickettsioses presenting with fever of unknown origin (FUO) but tested negative for scrub typhus, murine typhus, or Q fever were retrospectively identified during 2009 to 2010. The archived serum samples were examined for the presence of antibodies against R. felis, Rickettsia japonica, and Rickettsia typhi using microimmunofluorescence (MIF) assay. Serological evidence of Rickettsia exposure was found in 23 (19%, 23/122) patients. Eight patients had antibodies reactive to R. felis, including four with current infection (a ≥4-fold increase in IgG titer between acute and convalescent sera). The clinical presentations of these four patients included fever, skin rash, lymphadenopathy, as well as more severe conditions such as pancytopenia, hepatomegaly, elevated liver enzymes/bilirubin, and life-threatening acute respiratory distress syndrome. One of the patients died after doxycycline was stopped after being tested negative for scrub typhus, Q fever, and murine typhus. Conclusions Rickettsia felis is a neglected flea-borne pathogen in Taiwan, and its infection can be life-threatening. Further prospective studies of the prevalence of R. felis among patients with FUO and compatible clinical manifestations are warranted.


2021 ◽  
Vol 15 ◽  
Author(s):  
Bianca Seminotti ◽  
Mateus Grings ◽  
Paolo Tucci ◽  
Guilhian Leipnitz ◽  
Luciano Saso

Inherited metabolic disorders (IMDs) are rare genetic conditions that affect multiple organs, predominantly the central nervous system. Since treatment for a large number of IMDs is limited, there is an urgent need to find novel therapeutical targets. Nuclear factor erythroid-related factor 2 (Nrf2) is a transcription factor that has a key role in controlling the intracellular redox environment by regulating the expression of antioxidant enzymes and several important genes related to redox homeostasis. Considering that oxidative stress along with antioxidant system alterations is a mechanism involved in the neuropathophysiology of many IMDs, this review focuses on the current knowledge about Nrf2 signaling dysregulation observed in this group of disorders characterized by neurological dysfunction. We review here Nrf2 signaling alterations observed in X-linked adrenoleukodystrophy, glutaric acidemia type I, hyperhomocysteinemia, and Friedreich’s ataxia. Additionally, beneficial effects of different Nrf2 activators are shown, identifying a promising target for treatment of patients with these disorders. We expect that this article stimulates research into the investigation of Nrf2 pathway involvement in IMDs and the use of potential pharmacological modulators of this transcription factor to counteract oxidative stress and exert neuroprotection.


2012 ◽  
Vol 34 (3) ◽  
pp. 80-85 ◽  
Author(s):  
ABM Shahidul Alam ◽  
Sanjana Zaman ◽  
Farhana Chaiti ◽  
Naveen Sheikh ◽  
Gopen Kumar Kundu

Background: Recent reports from developing countries show that the clinical presentation, diagnosis and treatment of typhoid have significantly altered often leading to missed diagnosis. The incidence of complications is also reported to be variable. The consequence of missed diagnosis is immense in terms of burden on limited health resources and patients’ suffering. Therefore, its clinical spectrum requires constant reappraisal to update our physicians with current knowledge. This study was carried out to determine the changes in clinical pattern of typhoid fever. Patients & Methods: A total of 106 children, aged up to 14 years, diagnosed primarily as typhoid fever, were included as study population. The diagnostic criteria were either positive blood culture for Salmonella typhi or Salmonella paratyphi or at least a four-fold rise in antibody titre on Widal test. The study included mode of clinical presentations, treatment received before admission, Widal test findings and culture and sensitivity to antibiotics. Results: The mean age of the patients was 5.2 years and males were a little than the females. The mean duration of illness was 11.2±3.3 days. Majority of the patients presented with classical signs and symptoms like step ladder pattern of fever (nearly 70%) coated tongue (69.8%), diarrhoea (49.1%), toxemia (68.9%), relative leucopenia (71.7%), hepatomegaly (55.7%), pain in the right hypochondrium (41.5%) and splennomegaly (18.9%). Very few cases had a typical manifestations. Over 85% of the patients had raised SGPT (>40 IU/L) and 13.8% had detectable jaundice (serum billirubin >3 mg/dl). Widal test demonstrated that about 45% of the patients’ ‘O’ antibody titer increased to 4-fold, 27.4% to 8-fold or more. In case of antibody ‘H’, 35.8% exhibited 4-fold and 39.7% 8-fold or more increase. Of the 103 cases, 68(66%) were positive for Salmonella typhi. Majority of the isolated organisms was sensitive to cefixime, ceftriaxone and gentamycin (83%, 84% and 82% respectively). The second line of sensitivity was obtained to amikacin (64.2%), meropenem (50%), ciprofloxacin (46.2%), imepenem (46.2%) and azithromycin (43.4%). The least sensitive drugs were amoxicillin (28.3%), cotrimoxazole (27.4%) and chloramphenicol (22.6%). Onethird (33.8%) of the patients had multidrug resistant (MDR) strains. However, No significant association was found between multi-drug resistant (MDR) strains and atypical clinical manifestations. Conclusion: Clinical presentation of most typhoid fever still conforms with the classic pattern. High fever, anorexia, coated tongue, diarrhoea, relative leucopenia and hepatosplenomegaly are still common manifestations of typhoid fever. So, majority of the patients could be treated blindly based on clinical diagnosis. However, treatment should be given with first line of drugs like cefexime or ceftriaxone. DOI: http://dx.doi.org/10.3357/bjch.v34i3.10357 BJCH 2010; 34(3): 80-85


2020 ◽  
Vol 6 (3) ◽  
pp. 190-196
Author(s):  
Abdolreza Medghalchi ◽  

Inherited metabolic disorders (IMDs) are a class of genetic disorders. Each metabolic disorder may have different forms with different age of onset, clinical manifestations, severity, and even type of inheritance. Ideally, a group of different specialists, including ophthalmologists, pediatricians, biochemists, and medical geneticists are needed for the final diagnosis and management of IMDs. Because of the importance of the aforementioned issue, we investigated the effect of IMDs on the eye in this review. Metabolic disorders can induce abnormalities in conjunctiva, cornea, lens, retina, optic nerve, and eye motility.  In this study, the authors aimed to address the effect of metabolic diseases of amino acids, carbohydrates, and lipids on eye metabolism. Because of the direct toxic mechanisms of abnormal metabolites on the eyes and regarding the effect of eye monitoring on follow-up, management, and treatment of IMDs, a detailed ophthalmological assessment is essential.


Sign in / Sign up

Export Citation Format

Share Document