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Portal Hypertension01:22

Portal Hypertension

Portal hypertension is an increase in blood pressure within the portal venous system. Normally, this pressure is less than 5 mmHg. It is considered clinically significant when it rises above 10 mmHg. At this threshold, complications from altered blood flow and venous congestion emerge.EtiologyPortal hypertension arises from conditions that impede blood flow through the liver. The most common cause is cirrhosis, in which chronic liver injury leads to fibrotic scarring. This fibrosis narrows or...
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Cardiomyopathy I: Introduction and Classification

Cardiomyopathy, or CMP, is a group of diseases affecting the myocardial structure, impairing its ability to pump blood effectively. This condition can lead to arrhythmias, heart failure, or sudden cardiac death.Cardiomyopathies are classified into primary and secondary categories:Primary Cardiomyopathy refers to conditions involving only the heart muscle that are often idiopathic (of unknown cause) or genetic. They primarily affect the myocardium without the involvement of other systemic...
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Pulmonary Hypertension: Classification and Pathogenesis

Pulmonary hypertension (PH) is a severe health condition in which the mean pulmonary arterial pressure increases to 25 mmHg or more, even when the body is at rest. This high pressure in the blood vessels that transport blood from the heart to the lungs can cause various symptoms, including shortness of breath, can lead to right heart failure, and significantly affect the overall quality of life.
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Non-gated Ion Channels01:24

Non-gated Ion Channels

Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Cardiovascular Drugs: Classification based on Therapeutic Indications01:18

Cardiovascular Drugs: Classification based on Therapeutic Indications

Cardiovascular diseases, encompassing a range of conditions, can significantly affect the heart's operations and the overall circulatory system. These conditions impair the heart's ability to pump blood, leading to a deficit in oxygen supply to crucial organs. Anomalies in the heart's electrical system, known as arrhythmias, can cause heartbeats to accelerate or slow down. Usually, heart rates increase during physical activity and decrease while resting or sleeping. However, frequent irregular...
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Voltage-gated Ion Channels

Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
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Determination of the Relative Cell Surface and Total Expression of Recombinant Ion Channels Using Flow Cytometry
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Published on: September 28, 2016

Channelopathies: a review.

Genevieve Bernard1, Michael I Shevell

  • 1Department of Neurology/Neurosurgery, McGill University, Montreal Children's Hospital-McGill University Health Center, Montreal, Quebec, Canada.

Pediatric Neurology
|January 22, 2008
PubMed
Summary

Channelopathies are rare neurologic disorders caused by genetic ion channel defects. This review categorizes them by clinical symptoms like weakness and epilepsy, aiding diagnosis.

Area of Science:

  • Neurology
  • Genetics
  • Molecular Biology

Background:

  • Channelopathies represent a growing category of neurologic disorders.
  • These conditions stem from genetically determined ion channel dysfunctions.
  • Significant genetic and phenotypic diversity complicates their understanding.

Purpose of the Study:

  • To systematically review and categorize channelopathies.
  • To correlate clinical manifestations with molecular underpinnings.
  • To aid clinicians in diagnosis and genetic testing.

Main Methods:

  • Systematic literature review.
  • Categorization based on predominant clinical features (myotonia, weakness, migraine, ataxia, epilepsy, movement disorders).
  • Analysis of genetic and phenotypic overlaps.

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Voltage-Dependent Potassium Current Recording on H9c2 Cardiomyocytes via the Whole-Cell Patch-Clamp Technique
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Main Results:

  • Categorization of channelopathies by clinical presentation.
  • Identification of molecular bases for various syndromes.
  • Highlighting of genetic and phenotypic overlaps between disorders.

Conclusions:

  • Categorizing channelopathies by clinical manifestation aids understanding.
  • Knowledge of molecular basis is crucial for diagnosis.
  • This review assists clinicians in diagnostic acumen and targeted genetic testing.