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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
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Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
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Intracoronary Cryotherapy for Vulnerable Plaque Stabilization.

Nabel Rajab Basha1, Rimsha Ahmad1, Saifullah Khan2

  • 1From the Department of Medicine, Westchester Medical Center, New York Medical College, Valhalla, NY.

Cardiology in Review
|February 3, 2026
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Identifying vulnerable coronary plaques is key to preventing heart attacks. Intracoronary cryotherapy shows promise in stabilizing these high-risk plaques by modifying their biology, offering a new interventional approach.

Keywords:
acute coronary syndromeintracoronary cryotherapyintravascular imagingnonculprit lesionsplaque stabilizationvulnerable plaque

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Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Biomedical Engineering

Background:

  • Acute coronary syndromes often result from vulnerable coronary plaque rupture, not just severe blockages.
  • Advanced imaging (IVUS, OCT, NIRS, CCTA) precisely identifies high-risk plaque features like thin caps and large lipid cores.
  • Current therapies focus on lipid reduction, but direct plaque stabilization strategies are needed.

Purpose of the Study:

  • To review current methods for identifying vulnerable coronary plaques.
  • To summarize existing pharmacologic and interventional treatments for plaque stabilization.
  • To explore the potential of intracoronary cryotherapy as a novel plaque-directed therapy.

Main Methods:

  • Review of preclinical studies on intracoronary cryotherapy's effects on plaque composition.
  • Analysis of early first-in-human data regarding technical feasibility and safety.
  • Synthesis of contemporary imaging and therapeutic strategies for vulnerable plaques.

Main Results:

  • Preclinical cryotherapy studies show increased fibrous cap thickness and collagen, indicating plaque stabilization.
  • Early human trials suggest intracoronary cryotherapy is technically feasible and safe in the short term.
  • Intracoronary cryotherapy offers a non-implantable, thermal modulation approach to plaque modification.

Conclusions:

  • Vulnerable plaque identification has advanced significantly with new imaging modalities.
  • Intracoronary cryotherapy represents an emerging investigational therapy for direct plaque stabilization.
  • Further research is warranted to establish the long-term efficacy and safety of cryotherapy for vulnerable plaques.