Video Experimental Relacionado
Updated: Jul 20, 2026
07:15
Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway
Published on: August 23, 2024
Prevalencia y determinantes de la valvulopatía en pacientes tratados con dexfenfluramina
B K Shively1, C A Roldan, E A Gill
1Cardiology Divisions of Oregon Health Sciences University, Portland, OR, USA. shivelyb@ohsu.edu
Circulation
|November 26, 1999
Resumen
El uso de dexfenfluramina aumenta el riesgo de regurgitación valvular, particularmente regurgitación aórtica leve. Esta condición puede mejorar después de suspender el medicamento, ya que la edad y la presión arterial también influyen en la prevalencia.
Área de la Ciencia:
- Cardiología Cardiología.
- Farmacología Farmacología.
- La medicina clínica es la medicina clínica.
Sus antecedentes:
- Regurgitación valvular relacionada con la dexfenfluramina, pero la prevalencia y la gravedad no están claras.
- Los factores que contribuyen a la regurgitación valvular asociada a la dexfenfluramina son poco conocidos.
Objetivo del estudio:
- Para determinar la prevalencia y la gravedad de la regurgitación valvular en los usuarios de dexfenfluramina.
- Para identificar los factores asociados con la regurgitación valvular relacionada con la dexfenfluramina.
Principales métodos:
- Ecocardiografía en 412 sujetos (172 pacientes con dexfenfluramina, 172 controles, 68 sin coincidencia).
- Interpretación independiente por 3 ecocardiógrafos.
- Análisis de los factores relacionados con la regurgitación, incluyendo la edad, la presión arterial y el tiempo transcurrido desde la interrupción del tratamiento.
Principales resultados:
- La regurgitación de grado de la FDA es significativamente más frecuente en pacientes con dexfenfluramina (7,6% frente a 2,1%, P=0,01).
- La regurgitación aórtica leve fue el principal factor (6,3% vs. 1,6%, P<0,02).
- La edad avanzada, la presión arterial diastólica más alta y el tiempo más corto desde la interrupción se relacionaron de forma independiente con la regurgitación.
Conclusiones:
- El uso de dexfenfluramina se asocia con una mayor prevalencia de regurgitación valvular anormal.
- La edad y la presión arterial pueden influir en la prevalencia de la regurgitación.
- La regurgitación valvular relacionada con la dexfenfluramina puede regresar después de la interrupción del tratamiento.
Videos de Conceptos Relacionados
01:25Factors Influencing Drug Absorption: Disease States and Pharmacology
Multiple disease states can significantly influence the oral drug absorption process by affecting blood flow and the functionality of the gastrointestinal (GI) system. Various GI diseases, including conditions that alter GI motility, such as diarrhea, decreased acid secretions (achlorhydria), and infections, have been associated with reduced drug absorption.
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
Substances such as alcohol and specific drugs, including antineoplastics, can also negatively impact drug absorption. For instance,...
01:20Factors Affecting Protein-Drug Binding: Protein-Related Factors
Drug binding to proteins is a key aspect of pharmacokinetics and can influence a drug's distribution, absorption, and elimination in the body. Several factors, including the drug's physiochemical properties, protein concentration, disease states, and the number of binding sites on the protein, influence this process.
The physicochemical properties of a drug play a significant role in its ability to bind to proteins. Lipophilic drugs, which dissolve in fats, oils, and lipids, can be bound by...
The physicochemical properties of a drug play a significant role in its ability to bind to proteins. Lipophilic drugs, which dissolve in fats, oils, and lipids, can be bound by...
01:29Factors Affecting Protein-Drug Binding: Patient-Related Factors
Protein-drug binding, a pivotal aspect of pharmacokinetics, is subject to considerable variability influenced by an array of patient-related factors. The intricate interplay of age, individual differences, and pathological conditions significantly impact the binding dynamics and subsequent pharmacological effects.
Age stands as a key determinant in protein-drug binding. Neonates, characterized by low albumin content, experience heightened concentrations of unbound drugs such as phenytoin and...
Age stands as a key determinant in protein-drug binding. Neonates, characterized by low albumin content, experience heightened concentrations of unbound drugs such as phenytoin and...
01:29Therapeutic Drug Monitoring: Affecting Factors
Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.
01:15Impact of Pharmacokinetic–Pharmacodynamic Models: Regulatory Decisions
PK–PD modeling has significantly influenced FDA regulatory decisions, particularly drug approval, dosage optimization, and labeling. These models integrate pharmacokinetics (PK) and pharmacodynamics (PD) to predict drug behavior and effects, aiding in optimizing dosing regimens and enhancing the probability of clinical trial success.One notable example is Nesiritide (Natrecor®), a recombinant human brain natriuretic peptide for treating acute decompensated congestive heart failure (CHF).
01:27Diabetic Retinopathy
DefinitionDiabetic retinopathy is a microvascular complication of diabetes affecting the retinal blood vessels.Risk FactorsDiabetic retinopathy is present in almost all individuals with type 1 diabetes and more than 60% of those with type 2 diabetes after two decades of disease.The risk increases with poor glycemic control, hypertension, dyslipidemia, smoking, pregnancy, and puberty.Although cataracts and glaucoma are also more frequent in people with diabetes, retinopathy remains the leading...