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Channel Posts
| 2 | https://meded.onelink.me/5aR9/51ewdn4b | 285 |
| 3 | Choose the correct one | 298 |
| 4 |  No text... | 266 |
| 5 | Correct Answer: (d) Vagus
Explanation: The aortic opening, also known as the aortic hiatus, is an opening in the diaphragm through which the aorta passes as it descends into the abdominal cavity. Several structures pass through or near the aortic opening. Let's examine each option:
(a) Azygos vein: The azygos vein is a major venous structure that ascends through the chest on the right side and typically arches over the right mainstem bronchus before entering the superior vena cava. It does pass through the aortic opening.
(b) Aorta: The aorta, the largest artery in the body, passes through the aortic opening as it descends from the thoracic to the abdominal cavity.
(c) Thoracic duct: The thoracic duct, the largest lymphatic vessel in the body, typically passes through the aortic opening on its way to empty into the venous system. It carries lymph from the lower half of the body and the left upper half.
(d) Vagus: The vagus nerve, which contains both the cranial nerves X (vagus) and IX (glossopharyngeal), travels in the thorax and abdomen but does NOT pass directly through the aortic opening. It runs anterior to the aortic arch and descends alongside the esophagus.
In the context of this patient's chest pain and shortness of breath, compression or impingement of structures passing through the aortic opening can be a cause of symptoms. In this case, the vagus nerve is the structure not passing directly through the aortic opening. Therefore, option (d) Vagus is the correct answer. | 252 |
| 6 | Choose the correct one | 239 |
| 7 | No text... | 242 |
| 8 | Correct Answer: (b) Noradrenaline
Explanation:
The symptoms described in the patient, including increased heart rate, dilated pupils, excessive sweating, and elevated blood pressure, are consistent with a "fight or flight" response, which is mediated by the sympathetic division of the autonomic nervous system. The major neurotransmitter released at end organ effectors of the sympathetic division is noradrenaline (norepinephrine). This neurotransmitter activates adrenergic receptors on various target tissues, leading to the observed physiological responses.
While adrenaline (epinephrine) is also involved in the sympathetic response, noradrenaline is the primary neurotransmitter at the end organ effectors in most cases. Therefore, option (b) Noradrenaline is the correct answer. | 296 |
| 9 | Choose the correct one | 278 |
| 10 | No text... | 267 |
| 11 | Correct Answer: D) Myelofibrosis
Explanation: Myelofibrosis is a myeloproliferative disorder characterized by bone marrow fibrosis, leading to pancytopenia. Tear-drop cells and nucleated red blood cells are often seen on peripheral blood smear in myelofibrosis | 399 |
| 12 | Choose the correct one | 390 |
| 13 | Question 2: A 30-year-old woman presents with fatigue, pale skin, and easy bruising. Her blood work reveals a low hemoglobin level, low platelet count, and an elevated white blood cell count. Peripheral blood smear shows tear-drop cells and nucleated red blood cells. What is the most likely diagnosis?
A) Iron-deficiency anemia
B) Aplastic anemia
C) Thalassemia
D) Myelofibrosis
E) Hemolytic anemia | 373 |
| 14 | Correct Answer: C) Right coronary artery (RCA)
Explanation: ST-segment elevation in leads II, III, and aVF suggests an inferior myocardial infarction (MI). The RCA supplies blood to the inferior wall of the heart, so its occlusion can lead to changes in these ECG leads. | 338 |
| 15 | Guess the correct one | 293 |
| 16 | Q) A 45-year-old male presents with sudden-onset severe chest pain that radiates to his left arm. He is diaphoretic and appears anxious. An electrocardiogram (ECG) shows ST-segment elevation in leads II, III, and aVF. Which of the following coronary arteries is most likely occluded in this patient?
A) Left anterior descending (LAD) artery
B) Left circumflex (LCx) artery
C) Right coronary artery (RCA)
D) Posterior descending artery
E) Left main coronary artery | 262 |
| 17 | Correct Answer: C) Methylmalonyl-CoA mutase
Explanation:
This patient presents with symptoms of megaloblastic anemia, including fatigue and muscle weakness, along with neurological symptoms like numbness and decreased deep tendon reflexes. The laboratory findings indicate a macrocytic anemia (elevated MCV) and a low serum vitamin B12 level. This clinical presentation is characteristic of vitamin B12 deficiency, which can result from pernicious anemia or malabsorption.
In pernicious anemia, autoantibodies against gastric parietal cells or intrinsic factor lead to a deficiency in vitamin B12 absorption in the ileum. Vitamin B12 is essential for the function of methylmalonyl-CoA mutase, which is involved in the conversion of methylmalonyl-CoA to succinyl-CoA. A deficiency in vitamin B12 impairs this enzyme, leading to the accumulation of methylmalonic acid, which can cause neurological symptoms.
The other enzymes listed (A, B, D, and E) are not primarily affected in vitamin B12 deficiency and do not explain the clinical findings in this patient.
Please note that this is a complex clinical scenario, and patients with similar symptoms should be evaluated comprehensively in a clinical setting. | 250 |
| 18 | Choose the correct one | 246 |
| 19 | Question: A 28-year-old female presents with fatigue, muscle weakness, and numbness in her extremities. On physical examination, she has muscle weakness and decreased deep tendon reflexes. Laboratory results show a hemoglobin of 9.5 g/dL, a mean corpuscular volume (MCV) of 100 fL, and a serum vitamin B12 level of 80 pg/mL (reference range 200-900 pg/mL). Which of the following enzymes is most likely affected in this patient's condition?
A) DNA polymerase
B) RNA polymerase
C) Methylmalonyl-CoA mutase
D) Pyruvate carboxylase
E) Alpha-ketoglutarate dehydrogenase | 246 |
| 20 | Choose the correct one | 304 |
