Cyanosis
Cyanosis - Related Videos
09:59
Respiratory Exam I: Inspection and Palpation
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2023
Source: Suneel Dhand, MD, Attending Physician, Internal Medicine, Beth Israel Deaconess Medical Center Disorders of the respiratory system with a chief complaint of shortness of breath are among the most common reasons for both outpatient and inpatient evaluation. The most obvious visible clue to a respiratory problem will be whether the patient is displaying any signs of respiratory distress, such as fast respiratory rate and/or cyanosis. In a clinical situation, this will always require...
05:02
Observation and Inspection
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2023
Source: Jaideep S. Talwalkar, MD, Internal Medicine and Pediatrics, Yale School of Medicine, New Haven, CT Observation and inspection is fundamental to physical examination and begins at the first point of contact with a patient. While observation and inspection are often used interchangeably, observation is a general term that refers to the careful use of one's senses to gain information. Inspection is an act limited to what one can observe visually, and when referring to physical examination,...
07:39
Cardiac Exam I: Inspection and Palpation
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2023
Source: Suneel Dhand, MD, Attending Physician, Internal Medicine, Beth Israel Deaconess Medical Center The cardiac assessment is one of the core examinations performed by almost every physician whenever encountering a patient. Disorders of the cardiac system are among the most common reasons for hospital admission, with conditions ranging from myocardial infarction to congestive heart failure. Learning a complete and thorough cardiac examination is therefore crucial for any practicing physician.
06:22
Neonatal Pial Surface Electroporation
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Cited by 6 •
2014
The pial surface is a unique progenitor zone in the CNS that is receiving increasing attention. Herein, we detail a method for rapid genetic manipulation of this progenitor zone using a modified electroporation method. This procedure can be used for cellular and molecular investigations of cell lineages and signaling pathways involved in cell differentiation and to elucidate the fate and properties of daughter cells.
08:36
Pericardiocentesis
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2023
Source: Rachel Liu, BAO, MBBCh, Emergency Medicine, Yale School of Medicine, New Haven, Connecticut, USA The heart lies within the pericardium, a relatively inelastic fibrous sac. The pericardium has some compliance to stretch when fluid is slowly introduced into the pericardial space. However, rapid accumulation overwhelms pericardial ability to accommodate extra fluid. Once a critical volume is reached, intrapericardial pressure increases dramatically, compressing the right ventricle and...
FAQs
The visible color reflects a shift toward greater amounts of deoxygenated hemoglobin in blood beneath the tissues. As this hemoglobin becomes more prominent, the altered coloration can be seen through the skin, lips, or mucous membranes. This links the external sign to changes in blood oxygenation rather than to a primary change in the tissue itself.
Central cyanosis reflects reduced oxygen levels in arterial blood, so discoloration may involve central sites such as the lips or mucous membranes. Peripheral cyanosis develops when slower blood flow allows tissues to extract more oxygen locally, increasing deoxygenated hemoglobin in those regions. The distinction helps connect the distribution of discoloration with different oxygenation or circulation problems.
Cyanosis provides a visible clue that oxygen transport or blood movement may be impaired. Reduced arterial oxygenation can affect the oxygen delivered through circulation, whereas slowed peripheral flow can increase local oxygen extraction. For biology, this makes the sign useful for relating hemoglobin state, circulation, and tissue perfusion during health and disease.
The distribution of cyanosis depends on whether the main change involves arterial oxygen levels or local circulation. Respiratory and cardiovascular dysfunction can produce altered oxygenation, while circulatory slowing can produce more localized peripheral changes. Examining the affected skin, lips, or mucous membranes therefore adds anatomical information to the assessment of oxygen transport.
Assessment combines visual examination with measurements that evaluate oxygenation more directly. Clinicians consider the color and distribution of the skin, lips, or mucous membranes, then use pulse oximetry and blood-gas analysis as complementary information. Comparing these findings helps relate the visible sign to arterial oxygen status, circulation, and possible underlying dysfunction.
Distribution helps distinguish a widespread oxygenation problem from a change concentrated in peripheral circulation. Central involvement directs attention toward arterial oxygen levels, whereas peripheral involvement may indicate slowed flow and increased local oxygen extraction. Used with examination and oxygen-related measurements, this pattern supports evaluation of respiratory, cardiovascular, or circulatory dysfunction without identifying a cause by appearance alone.