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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

1.7K
Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

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Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
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Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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Assessing respiratory rate concurrently with pulse measurement is fundamental to patient care, providing valuable insights into the patient's respiratory function. The normal breathing rate for an adult usually falls within a normal range of 12 to 20 breaths per minute. Abnormal respiratory rates can signal underlying health conditions or the need for immediate intervention.
Ensuring accuracy in vital sign recordings while prioritizing patient comfort and minimizing anxiety is...
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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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Assessment of apical radial pulse01:25

Assessment of apical radial pulse

1.6K
Apical-Radial (A-R) Pulse Assessment
The A-R pulse assessment involves simultaneous evaluation of the apical and radial pulses. When the apical and radial pulse rates vary, this assessment helps identify a pulse deficit.
Pre-Procedural Preparation
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Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

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Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
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Related Experiment Video

Updated: Apr 18, 2026

Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver
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Software for Analysis of Heart Rate and Blood Pressure Time-series Data from the Valsalva Maneuver

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Fully automatic rhythm analysis during chest compression pauses.

U Ayala1, U Irusta1, J Ruiz1

  • 1Communications Engineering Department, University of the Basque Country UPV/EHU, Alameda Urquijo S/N, 48013 Bilbao, Spain.

Resuscitation
|January 27, 2015
PubMed
Summary
This summary is machine-generated.

An automatic method reliably analyzes heart rhythms during ventilation pauses in cardiopulmonary resuscitation (CPR). This improves shock delivery and increases chest compression fraction in cardiac arrest patients.

Keywords:
Automated external defibrillator (AED)Cardiac arrestCardiopulmonary resuscitation (CPR)Chest compressionTransthoracic impedance

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Area of Science:

  • Emergency Medicine
  • Cardiology
  • Biomedical Engineering

Background:

  • Chest compressions during cardiopulmonary resuscitation (CPR) create artefacts that hinder accurate rhythm analysis.
  • Ventilation pauses in 30:2 CPR offer a window for rhythm assessment without compression artefacts.

Purpose of the Study:

  • To validate a fully automatic method for reliable and accurate rhythm analysis during ventilation pauses in 30:2 CPR.
  • To assess the feasibility of advancing defibrillation shocks and improving chest compression fraction (CCF).

Main Methods:

  • Analysis of 1414 minutes of 30:2 CPR data from 135 out-of-hospital cardiac arrest cases.
  • Utilized an automatic pause detector based on transthoracic impedance to identify pauses >3.5s.
  • Employed a shock advice algorithm (SAA) to analyze 3-second ECG segments during pauses for rhythm diagnosis.

Main Results:

  • The automatic pause detector demonstrated 93.5% sensitivity and 97.3% positive predictive value (PPV).
  • The SAA achieved 93.8% sensitivity and 95.9% specificity in rhythm analysis during detected pauses.
  • The method could have advanced shocks in 97% of cases and avoided rhythm reassessment pauses in 95.2% of nonshockable rhythms, increasing CCF.

Conclusions:

  • A fully automatic rhythm analysis method during ventilation pauses is safe and accurate.
  • This approach facilitates early detection of refibrillation and enhances CCF in patients with nonshockable rhythms.