Video Experimental Relacionado
Updated: Jul 31, 2026

08:31
Optimized Griess Reaction for UV-Vis and Naked-eye Determination of Anti-malarial Primaquine
Published on: October 11, 2019
La quinidina en el falciparum para el paludismo
Lancet (London, England)
|November 14, 1981
Resumen
La quinidina oral trató eficazmente la malaria de Plasmodium falciparum en catorce pacientes, sin mostrar ninguna cardiotoxicidad. Este medicamento antimalarial puede ser más potente que la quinina, con concentraciones inhibidoras mínimas más bajas observadas in vitro.
Área de la Ciencia:
- Enfermedades infecciosas Enfermedades infecciosas.
- Farmacología Farmacología.
- La medicina tropical es una medicina tropical.
Sus antecedentes:
- La malaria Plasmodium falciparum sigue siendo una amenaza significativa para la salud mundial.
- La resistencia a los medicamentos requiere el desarrollo de tratamientos antimaláricos novedosos y efectivos.
- La quinina ha sido un tratamiento primario, pero su eficacia se ve cuestionada por la resistencia y los efectos secundarios.
Objetivo del estudio:
- Evaluar la eficacia y seguridad de la quinidina oral para el tratamiento de la malaria por Plasmodium falciparum.
- Para comparar la actividad in vitro de la quinidina y la quinina contra Plasmodium falciparum.
Principales métodos:
- Un estudio clínico trató a catorce pacientes con quinidina oral.
- El seguimiento del paciente evaluó la recrudecencia durante 35 días.
- Los cultivos in vitro compararon las concentraciones mínimas inhibidoras (MIC) de quinidina y quinina.
Principales resultados:
- Los catorce pacientes lograron un tratamiento exitoso con quinidina oral.
- Doce pacientes permanecieron libres de recrudecimiento durante 35 días.
- Los estudios in vitro demostraron MICs consistentemente más bajos para la quinidina en comparación con la quinina.
Conclusiones:
- La quinidina oral es un tratamiento eficaz para el paludismo por Plasmodium falciparum.
- La quinidina muestra potencial para una mayor potencia que la quinina contra este parásito.
- Se justifica una mayor investigación sobre el papel de la quinidina en el tratamiento de la malaria.
Videos de Conceptos Relacionados
Depolarizing Blockers: Mechanism of Action
Depolarizing blockers act on skeletal muscle fibers' membranes and induce their depolarization. Most depolarizing blockers have two quaternary N+ atoms that bind the nicotinic acetylcholine receptors and cause neuromuscular blockade within minutes.
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because succinylcholine...
Succinylcholine is the most commonly used depolarizing blocker. Chemically, it constitutes two molecules of acetylcholine joined together by an acetate methyl group. They act on the receptors in the same way as acetylcholine. Because succinylcholine...
Depolarizing Blockers: Pharmocokinetics
Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...
Pharmacodynamic Models: Linear Concentration–Effect Model
The linear concentration–effect model, underpinned by the principle that pharmacological effect (E) is directly proportional to plasma drug concentration (C), emerges as a pivotal simplification of the Emax model for conditions where C is significantly less than EC50. This model portrays a linear trajectory of the concentration–effect relationship when drug levels are markedly below the EC50 threshold.Despite its inherent assumption of continuous effect augmentation with increasing drug...
Malaria
Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
Anthelminthic Agents
Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
Antiprotozoal Agents
Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...

