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Related Concept Videos

Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

288
Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and...
288
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

237
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without...
237
Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

498
Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2​​ and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are...
498
Disorders of Acid-Base Balance01:29

Disorders of Acid-Base Balance

251
The human body maintains a precise pH range of arterial blood between 7.35 and 7.45. Deviations result in either acidosis (pH < 7.35) or alkalosis (pH > 7.45). These conditions are further classified as respiratory or metabolic disorders based on their underlying cause.
Respiratory Acidosis and Alkalosis
Respiratory acidosis occurs due to an increase in the partial pressure of carbon dioxide PCO2 in the blood. It often arises from shallow breathing or impaired gas exchange caused by...
251
Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

24
The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
24
Acute Respiratory Failure-I01:21

Acute Respiratory Failure-I

256
Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
256

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Respiratory acidosis induced ST-segment elevation.

Yang Cheng1, Baotao Huang1, Mao Chen2

  • 1Department of Cardiology, West China Hospital, Sichuan University, 37 Guoxue Street, Chengdu 610041, PR China.

The American Journal of Emergency Medicine
|May 25, 2023
PubMed
Summary
This summary is machine-generated.

Severe respiratory acidosis can mimic heart attacks, causing ST-segment elevation. Mechanical ventilation corrected both acidosis and electrocardiogram changes in a patient with rectal cancer.

Keywords:
AcidosisCoronary angiographyElectrocardiogramST-segment elevation

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Area of Science:

  • Cardiology
  • Oncology
  • Critical Care Medicine

Background:

  • Acidosis is a known potential cause of electrocardiogram (ECG) abnormalities.
  • ST-segment elevation on ECG typically indicates myocardial infarction, necessitating urgent investigation.

Observation:

  • A patient with rectal adenocarcinoma experienced cardiac arrest during contrast-enhanced computed tomography (CT).
  • Following resuscitation, severe respiratory acidosis and anterior ST-segment elevation were detected on ECG.
  • Coronary angiography and echocardiography showed no cardiac abnormalities, and CT revealed metastatic cancer but no cardiac involvement.

Findings:

  • The ST-segment elevation resolved, and respiratory acidosis was corrected after initiating mechanical ventilation.
  • This suggests a direct association between severe respiratory acidosis and the observed ECG changes.

Implications:

  • This case highlights the importance of considering metabolic and respiratory derangements, such as acidosis, in the differential diagnosis of ST-segment elevation.
  • Prompt recognition and management of underlying conditions like respiratory acidosis are crucial for appropriate patient care and avoiding unnecessary cardiac interventions.