KROK 1 2018 – Question 172 · KROK (Medicine) · Physiology
ECG of the patient shows increased duration of the QRS complex. What is the most likely cause?
- A. Increased atrial excitability
- B. Increased period of ventricular excitation
- C. Increased atrial and ventricular excitability
- D. Disturbed conduction in the atrioventricular node
- E. Increased period of atrial excitation
Hint
Ask which part of the cardiac cycle on the ECG the QRS complex represents, and what a longer duration says about the time that part takes.
The answer, the explanation and a note on every option are available once you log in. The account is free: topic tests, a mock exam, mistake review and statistics.
More questions on Physiology
- Vascular endothelium is characterized by high metabolic activity and synthesizes vasoactive substances. Among these substances there is a potent…
- A person becomes less receptive to pain in physically or emotionally straining situations due to activation of:
- In human organism significant blood loss leads to decreased blood pressure, tachycardia, and weakness. Eventually the sensation of thirst appears…
- On examination the patient was determined to have a strong, balanced, inert type of higher nervous activity according to Pavlov’s classification…
- After a trauma the patient has developed right-sided paralyses and disturbed pain sensitivity. On the left side no paralyses are observed, but pain…
- After hyperventilation an athlete developed a brief respiratory arrest. It occurred due to the following changes in the blood: