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  2. Trousseau sign of latent tetany - Wikipedia

    en.wikipedia.org/wiki/Trousseau_sign_of_latent...

    Trousseau sign of latent tetany is a medical sign observed in patients with low calcium. [1] From 1 to 4 percent of normal patients will test positive for Trousseau's sign of latent tetany. [ 2 ] This sign may be positive before other manifestations of hypocalcemia such as hyperreflexia and tetany , as such it is generally believed to be more ...

  3. Coronary CT calcium scan - Wikipedia

    en.wikipedia.org/wiki/Coronary_CT_calcium_scan

    A coronary CT calcium scan is a computed tomography (CT) scan of the heart for the assessment of severity of coronary artery disease. Specifically, it looks for calcium deposits in atherosclerotic plaques in the coronary arteries that can narrow arteries and increase the risk of heart attack. [1] These plaques are the cause of most heart ...

  4. Cardiac action potential - Wikipedia

    en.wikipedia.org/wiki/Cardiac_action_potential

    These calcium ions bind to and open more calcium channels (called ryanodine receptors) located on the sarcoplasmic reticulum within the cell, allowing the flow of calcium out of the SR. These calcium ions are responsible for the contraction of the heart. Calcium also activates chloride channels called I to2, which allow Cl − to enter the cell ...

  5. Myocardial contractility - Wikipedia

    en.wikipedia.org/wiki/Myocardial_contractility

    Increase the amount of calcium in the sarcoplasm. More calcium available for Troponin to use will increase the force developed. Decreasing contractility is done primarily by decreasing the influx of calcium or maintaining lower calcium levels in the cytosol of cardiac myocytes during an action potential.

  6. Stone heart syndrome - Wikipedia

    en.wikipedia.org/wiki/Stone_heart_syndrome

    The pathophysiology of Stone Heart Syndrome involves a complex interplay of cellular and molecular mechanisms. The primary driver is an abnormal increase in intracellular calcium within the heart muscle cells (cardiomyocytes). This calcium overload disrupts the normal contraction-relaxation cycle of the heart muscle. [1]

  7. Chvostek sign - Wikipedia

    en.wikipedia.org/wiki/Chvostek_sign

    The Chvostek sign (/ ˈ k v ɒ s t ɪ k /) is a clinical sign that someone may have a low blood calcium level (a decreased serum calcium, called hypocalcemia).The Chvostek sign is the abnormal twitching of muscles that are activated (innervated) by the facial nerve (also known as Cranial Nerve Seven, or CNVII). [1]

  8. Contraction band necrosis - Wikipedia

    en.wikipedia.org/wiki/Contraction_band_necrosis

    Contraction band necrosis is a type of uncontrolled cell death unique to cardiac myocytes and thought to arise in reperfusion from hypercontraction, which results in sarcolemmal rupture. [ 1 ] It is a characteristic histologic finding of a recent myocardial infarction (heart attack) that was partially reperfused.

  9. Hyperventilation syndrome - Wikipedia

    en.wikipedia.org/wiki/Hyperventilation_syndrome

    Hyperventilation syndrome (HVS), also known as chronic hyperventilation syndrome (CHVS), dysfunctional breathing hyperventilation syndrome, cryptotetany, [1] [2] spasmophilia, [3] [4] [5] latent tetany, [4] [5] and central neuronal hyper excitability syndrome (NHS), [3] is a respiratory disorder, psychologically or physiologically based, involving breathing too deeply or too rapidly ...

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