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Related Concept Videos

Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
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Respiratory Volumes and Capacities I01:26

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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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Physical assessment of the respiratory tract through inspection is a crucial step in understanding the patient's respiratory health. It provides insights into the functioning of the respiratory system, the musculoskeletal structure, and even the patient's nutritional status. This comprehensive approach involves observing several vital aspects: chest configuration, breathing patterns, respiratory rates, skin color, and use of accessory muscles.
Chest Configuration
The chest configuration can...
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Airway management is a key skill in emergency and critical care settings, as maintaining a clear airway is essential for adequate oxygenation and ventilation.Head Tilt-Chin Lift TechniqueThe head tilt-chin lift maneuver is an essential technique primarily used in patients without suspected cervical spine injuries. To perform this maneuver, one hand is placed on the patient’s forehead, and gentle pressure is applied backward to tilt the head. The fingertips of the other hand are positioned under...

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Standardized Model of Ventricular Fibrillation and Advanced Cardiac Life Support in Swine
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Published on: January 30, 2020

Breathing patterns during cardiac arrest.

Philippe Haouzi1, Nasrollah Ahmadpour, Harold J Bell

  • 1Div. of Pulmonary Medicine, Pennsylvania State Univ., 500 University Dr., PO Box 850, MC H047, Hershey, PA 17033-0850, USA. phaouzi@hmc.psu.edu

Journal of Applied Physiology (Bethesda, Md. : 1985)
|May 22, 2010
PubMed
Summary
This summary is machine-generated.

Breathing may continue for a short period after cardiac arrest (CA), challenging the assumption that absent breathing indicates CA. This delayed apnea is linked to brain stem anoxia development.

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Area of Science:

  • Cardiology
  • Respiratory Physiology
  • Neuroscience

Background:

  • Absence of respiratory movements is a key bystander criterion for recognizing out-of-hospital cardiac arrest (CA).
  • Persistent eupneic breathing is considered incompatible with CA, but the physiological basis for CA-related apnea is uncertain.
  • Brain stem Po(2) is not expected to drop immediately to critical levels causing anoxic apnea.

Purpose of the Study:

  • To determine when and if breathing stops after the onset of cardiac arrest.
  • To investigate the relationship between cardiac function, pulmonary blood flow, and respiratory activity.

Main Methods:

  • Ventilatory response was measured in eight patients during ventricular fibrillation (VF) onset.
  • Findings were extended in adult sheep, measuring ventilatory patterns after induced cardiac arrest.
  • Systemic and pulmonary blood flow, blood pressure, and respiratory parameters were monitored.

Main Results:

  • In humans and sheep, eupneic breathing continued unchanged for 15 seconds after cardiac arrest despite cessation of cardiac output.
  • Minute ventilation progressively increased in sheep for up to 164 seconds, followed by slow gasping and eventual apnea.
  • A decoupling between CO(2) return and respiratory activity was observed, contrary to predictions.

Conclusions:

  • Delayed cessation of breathing during cardiac arrest challenges the assumption that eupneic breathing signifies effective cardiac pumping.
  • The findings suggest that breathing cessation is primarily determined by the time required for brain stem anoxia to develop.
  • Current criteria for recognizing cardiac arrest based on respiratory movements may need re-evaluation.