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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
Formation of the Platelet Plug01:22

Formation of the Platelet Plug

The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Depression: Overview01:18

Depression: Overview

Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Depressive Disorders: MDD and Dysthymia01:27

Depressive Disorders: MDD and Dysthymia

Depressive disorders are a group of mental health conditions characterized by pervasive feelings of sadness, diminished pleasure in life, and a significant impact on daily functioning. These conditions are most prevalent in individuals during their 30s and affect women at twice the rate of men. Contrary to popular belief, younger individuals are generally more susceptible to these disorders than older adults. Two key types of depressive disorders include Major Depressive Disorder (MDD) and...
Antiplatelet Drugs: Prostaglandin Synthesis, P2Y12 and Glycoprotein IIb/IIIa Inhibitors01:20

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Antiplatelet drugs emerge as frontline defenders against the insidious threat of thromboembolic diseases, where abnormal clots obstruct vital blood vessels. These drugs stand as bulwarks, inhibiting platelet aggregation and clot formation, thereby mitigating the risk of life-threatening conditions like myocardial infarction, coronary artery disease, and thrombotic strokes.
Prostaglandin synthesis inhibitors, exemplified by the widely known aspirin, wield their power by irreversibly acetylating...

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Updated: Jun 25, 2026

Microfluidics in Assessing Platelet Function
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Platelet function in patients with major depression.

R C Ziegelstein1, K Parakh, A Sakhuja

  • 1Department of Medicine, Johns Hopkins University School of Medicine, Johns Hopkins Bayview Medical Center, 4940 Eastern Avenue, Baltimore, MD 21224-2780, USA. rziegel@jhmi.edu

Internal Medicine Journal
|February 18, 2009
PubMed
Summary
This summary is machine-generated.

Major depression and vascular diseases like heart and cerebrovascular conditions frequently co-occur, suggesting shared causes. Selective serotonin re-uptake inhibitors may increase bleeding risk.

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Area of Science:

  • Cardiovascular Medicine
  • Neuroscience
  • Psychiatry

Background:

  • Depression, ischemic heart disease, and cerebrovascular disease are leading causes of global morbidity.
  • These conditions often coexist, exacerbating health impacts compared to non-depressed patients with chronic diseases.
  • The frequent co-occurrence suggests potential common genetic predispositions, shared risk factors, or a pathophysiological link.

Purpose of the Study:

  • To explore the potential pathophysiological link between major depression and conditions involving platelet activation.
  • To review evidence connecting selective serotonin re-uptake inhibitors (SSRIs) to an increased risk of bleeding.

Main Methods:

  • Literature review focusing on the roles of serotoninergic and adrenergic signaling in depression and platelet function.
  • Examination of studies investigating the association between depression, vascular diseases, and SSRI use.

Main Results:

  • Serotonin and adrenergic signaling are implicated in both major depression and platelet activation, a key factor in vascular disease.
  • Evidence suggests a link between SSRI use and an elevated risk of bleeding.

Conclusions:

  • A potential pathophysiological connection exists between major depression and vascular diseases due to shared signaling pathways.
  • Clinicians should consider the increased bleeding risk associated with SSRIs, particularly in patients with vascular conditions.