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Related Concept Videos

Pulse01:16

Pulse

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When the heart pumps blood out, arterial elastic fibers play a crucial role in sustaining a high-pressure gradient. They expand to accommodate the received blood and then recoil - a process known as the pulse that can be either manually palpated or electronically quantified. Despite a reduction in its effect with increased distance from the heart, elements of the pulse's systolic and diastolic components persist, observable even at the arteriole level.
The pulse serves as a clinical...
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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Pulse Oximetry01:24

Pulse Oximetry

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Pulse oximetry, or SpO2, is a non-invasive method for continuously monitoring arterial oxygen saturation (SaO2). This procedure involves attaching a probe or sensor to the patient's fingertip, forehead, earlobe, or nose bridge. The sensor works by detecting changes in oxygen saturation levels through light signals generated by the oximeter and reflected by the pulsing blood under the probe.
Purpose
Average SpO2 values are greater than 95%. If the readings fall below 90%, it indicates that...
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Regulation of Pulse01:20

Regulation of Pulse

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Pulse regulation involves physiological mechanisms that ensure adequate blood flow throughout the body. The heartbeat, regulated by the autonomic nervous system, is influenced by hormonal balance, physical activity, and emotional state.
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Author Spotlight: Unraveling the Molecular Mechanisms in PCO and Fibrosis Following Cataract Surgery
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Precision pulse capsulotomy in challenging cataract surgery cases.

Min Ji Park1, Chan Woo Bang1, Sang Youp Han1

  • 1Department of Cornea and Refractive Surgery, Busan Sungmo Eye Hospital, Busan, Republic of Korea.

Clinical Ophthalmology (Auckland, N.Z.)
|August 24, 2019
PubMed
Summary

The precision pulse capsulotomy (PPC) device effectively created precise capsulotomies in challenging cataract surgeries. This innovative tool showed no intraoperative or early postoperative complications in the study.

Keywords:
Zeptocapsulorhexiscataractcataract extractionphacoemulsification

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Area of Science:

  • Ophthalmology
  • Surgical Innovation
  • Cataract Surgery

Background:

  • Challenging cataract surgeries often involve complications due to poor pupil dilation, dense cataracts, or corneal opacity.
  • Creating a precise anterior capsulotomy is crucial for successful intraocular lens implantation and visual outcomes.

Purpose of the Study:

  • To evaluate the efficacy and safety of the precision pulse capsulotomy (PPC) device in complex cataract surgery cases.
  • To assess the PPC device's performance in creating anterior capsulotomies in eyes with challenging surgical conditions.

Main Methods:

  • A retrospective case series of 43 eyes (35 patients) with difficult cataract surgery indications.
  • The PPC device was used via a 2.2-mm clear corneal incision, followed by phacoemulsification and IOL fixation.
  • Outcomes measured included capsulotomy quality, intraoperative complications, visual acuity, endothelial cell count, and refractive error at 2 months.

Main Results:

  • All 43 eyes achieved complete, circular, 360-degree, free-floating capsulotomies of appropriate size.
  • No anterior capsule tears or tags were observed.
  • No PPC device-related intraoperative or 2-month postoperative complications occurred.

Conclusions:

  • The PPC device is a valuable tool for creating accurate anterior capsulotomies in challenging cataract surgeries.
  • Further research is needed to establish the long-term safety and efficacy of the PPC device.