স্পেশাল বিসিএস (স্বাস্থ্য)

Reference: Davidson 23rd; P-432

Ref : Sembulingam 6th edition (Table- 136.1)
Explanation : RMP of a nerve fibre is -70 mV, Firing level of a nerve fibre is -55 mv, End of depolarization of the nerve fibre is at +35 mV.

Ref : Sembulingam 6th edition (Table- 136.1)

Unique transitional epithelium or urothelium lines much of the urinary tract, extending from the kidneys to the proximal part of the urethra, and is characterized by a superficial layer of large, dome-like cells sometimes called umbrella cells.

Reference-Davidson/23rd/P-435/Fig-16.6

Stem Breakdown:

Fatigue, pallor, and heavy menstrual periods: These symptoms suggest anaemia, and the history of heavy periods (menorrhagia) suggests blood loss as a likely cause.
Haemoglobin of 8.5 g/dL and MCV of 70 fL: The low haemoglobin indicates anaemia, and the low MCV (microcytosis) is characteristic of iron deficiency anaemia.
Option Analysis:

A) Iron deficiency anaemia: This is the correct diagnosis. Davidson and Harrison explain that iron deficiency anaemia is the most common cause of anaemia worldwide and is often due to chronic blood loss, particularly from menstruation in women. The microcytic, hypochromic anaemia (low MCV) is a hallmark finding.
B) Vitamin B12 deficiency: Vitamin B12 deficiency causes macrocytic anaemia (high MCV), not microcytic anaemia. Symptoms include neurological deficits, such as paraesthesia and balance problems, which are absent in this case.
C) Aplastic anaemia: Aplastic anaemia presents with pancytopenia (low red cells, white cells, and platelets) and a hypocellular bone marrow. It does not cause microcytosis and is not related to blood loss from menstruation.
D) Haemolytic anaemia: Haemolytic anaemia causes normocytic or macrocytic anaemia with increased reticulocytes and evidence of haemolysis (e.g., elevated bilirubin, LDH). There is no evidence of haemolysis in this case, and the low MCV points to iron deficiency.

Explanation : In addition to increase in anterior curvature of the lens, two more adjustments are made in the eyeball during accommodation for near vision.
1. Convergence of both eyeballs: It is necessary to bring the retinal images on to the corresponding points
2. Constriction of pupil: It is necessary to:
i. Increase the visual acuity by reducing lateral chromatic and spherical aberrations
ii. Reduce the quantity of light entering eye
iii. Increase the depth of focus through more central part of lens as its convexity is increased.
Ref : Sembulingam 6th edition (Page- 996)

Reference: Davidson 23rd; P-619

On liver biopsy, the characteristic early features of PSC are periductal ‘onion skin’ fibrosis and inflammation, with portal oedema and bile ductular proliferation resulting in expansion of the portal tracts (Fig. 24.34). Later, fibrosis spreads, progressing inevitably to biliary cirrhosis; obliterative cholangitis leads to the so-called ‘vanishing bile duct syndrome’.

EXplanation: The nephritic syndrome is characterised by the presence of haematuria in association with hypertension, oliguria, fluid retention and reduced/declining renal function

Explanation : Pressure sensation,pain sensation,temparature sensation with wider range (below 25 degree celcius & above 40 degree celcius) are protopathic sensation. Epicritic sensations are: i. Fine touch or tactile sensation, ii. Tactile localization, iii. Tactile discrimination, iv. Temperature sensation with finer range between 25°C and 40°C.Visceral,vibratory & kinesthetic sensations are deep sensations.
Ref : Sembulingam 6th edition (Figure- 144.1)

Explanation :
Crystal deposited in primary gout -
Monosodium  urate crystal

Reference: Davidson 23rd; P-798
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Reference: Davidson 23rd; P-637

Explanation :
Respiratory emergency -
Tension pneumothorax
Acute severe bronchial asthma
Acutr exacervation of COPD

Endocrine emergency :
DKA
Hypoglycemia
Thyrotoxic coma

Reference: Davidson 23rd; P-591

Stem Breakdown:

Confusion, ataxia, and nystagmus: This classic triad of symptoms is highly suggestive of Wernicke's encephalopathy, a neurological disorder associated with thiamine (vitamin B1) deficiency.
Chronic alcohol use: Chronic alcoholism is the most common cause of thiamine deficiency, leading to Wernicke's encephalopathy.
Rapid improvement with thiamine: This confirms that the symptoms were due to thiamine deficiency, which is rapidly reversible with appropriate supplementation.
Option Analysis:

A) Wernicke’s encephalopathy: This is the correct diagnosis. Davidson and Harrison both highlight that Wernicke’s encephalopathy is caused by thiamine deficiency, commonly seen in chronic alcoholics. The classic symptoms include confusion, ataxia, and ophthalmoplegia (nystagmus or other eye movement abnormalities). Rapid improvement with thiamine supports this diagnosis.
B) Korsakoff’s syndrome: Korsakoff's syndrome is a chronic sequela of untreated Wernicke’s encephalopathy, characterised by irreversible memory loss and confabulation. It does not cause rapid neurological improvement with thiamine administration.
C) Alcohol withdrawal: Alcohol withdrawal causes symptoms such as tremors, agitation, and hallucinations, but it does not typically present with the triad of confusion, ataxia, and nystagmus.
D) Hepatic encephalopathy: Hepatic encephalopathy occurs in patients with liver failure and is due to elevated ammonia levels. It presents with altered mental status but not with the other signs of Wernicke's (ataxia, nystagmus).

Reference: In pre-renal AKI, usually develops hypotension not hypertension. Davidson 23rd, Box-15.25

Culex is vector for filariasis

Explanation: Percussion-hyper-resonant is a feature of pneumothorax, Davidson 23rd page-547

1. Cortical activation of the direct pathway leads to increased thalamic output
2. Cortical activation of the indirect pathway leads to decreased thalamic output
3.Substantia nigra activation (via D1) of the direct pathway leads to increased thalamic output
4. Substantia nigra inhibition (via D2) of the indirect pathway leads to increased thalamic output
It is the combination of these pathways that allows for precise control of motor movement, balancing the excitatory direct pathway with the inhibitory indirect pathway.

Reference: Langman’s 13th; P-47

Chancroid usually starts as a small papule that rapidly becomes pustular and eventually ulcerates. The ulcer enlarges, develops ragged undermined borders, and is surrounded by a rim of erythema. Unlike syphilis, lesions are tender and the border of the ulcer is not indurated

Infection with mumps virus resulting in bilateral inflamed parotid glands Orchitis, pancreatitis, and aseptic meningitis may also be present.

Reference: Davidson 23rd, Box-3.4

Explanation: Campylobacter species have been linked to GBS & post infectious reactive arthritis.

Pyogenic liver abscesses are most commonly caused by ascending infection from the biliary tract (e.g., cholangitis, gallstones obstructing bile ducts), portal vein pylephlebitis from intra-abdominal infections (e.g., appendicitis, diverticulitis), or hematogenous spread from systemic infections. Amoebic liver abscesses are caused by Entamoeba histolytica but are less common than pyogenic abscesses in many parts of the world.

Explanation: Factor V Leiden mutation is the most common inherited thrombophilia. Davidson explains that this mutation renders Factor V resistant to inactivation by activated protein C, leading to a prothrombotic state. Harrison discusses that individuals with Factor V Leiden have a higher risk of venous thromboembolism, particularly in the presence of additional risk factors like surgery or immobility.

(Ref: medical examination review anatomy P:41)

(Ref: medical examination review anatomy P:43)

Explanation: Streptococcus has several enzymes that helps for rapid spreading (hyaluronidase).

Left iliac fossa mass
• Sigmoid colon cancer
• Constipation
• Diverticular mass

Gap junctions (Nexus) permit the exchange between cells of molecules. Signaling molecules such as some hormones, cAMP and cGMP and ions can move through gap junctions, causing the cells in many tissues to act in a coordinated manner. Such as-the heart’s coordinated beats.

Explanation: smoking is probably the most important modifiable risk factor.

Dr Abdullah Short Case

Anti-CCP antibodies are associated with rheumatoid arthritis (highly specific)

Paracortex: 
The region between the cortex and medulla, the paracor­tex or deep cortex does not have precise boundaries but can be distinguished from the outer cortex by its lack of nodules (B-lymphocytes). Paracortex mainly consists of T cells; hence, it is also called thymus-dependent cortex.

Reference: Davidson 23rd: Box-17.13

[Ref. Bailey Love's 28th]

Reference: Davidson 23rd; P-543
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Reference: Junqueira’s Basic Histology; 14th Edition; Page-370

Primary syphilis, caused by Treponema pallidum, presents with a painless chancre (ulcer) at the site of infection, typically on the genitals, which is highly infectious. Rash is seen in secondary syphilis, and gummas and tabes dorsalis are features of tertiary syphilis

The average blood volume of adults is about 7% of body weight, or about 5 litres. About 60% of the blood is plasma and 40% is red blood cells, but these percentages can vary considerably in different people, depending on sex, weight, and other factors.

Dura mater also known as pachymenix/menix fibrosa/tough mother(latin)

Uric acid stone is radio opaque

Merkel cell is responsible for tactile sensation

Explanation: Cough is the most common early symptom

Explanation: Acute coronary syndrome almost always occurs in patients who have atherosclerosis, The culprit lesion.

Explanation :
Seronegetive arthritis -
Reactive arthritis
Psoriatic arthritis
Ankylosing spondylitis
Enteropathic arthritis

Refractory hypertension refers to the situation where multiple drug treatments do not give adequate control of BP. Although this may be due to genuine resistance to therapy in some cases, a more common cause of treatment failure is non-adherence to drug therapy.

Reference: Davidson 23rd; P-841
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Explanation :
Fixative in tissue biopsy is used for fixation of tissue
It prevents autolysis
Most frequently, the routine fixative will be neutral buffered formalin.

Due to severe neutropenia (a component of pancytopenia), patients with aplastic anemia are highly susceptible to infections, which can be life-threatening. Anemia leads to fatigue and pallor, while thrombocytopenia causes bleeding tendencies (e.g., petechiae, ecchymoses, mucosal bleeding).

(Ref: medical examination review anatomy P:51)

Sweat glands: Stratified cuboidal
Mesothelium: Simple squamous
Fallopian tube: Ciliated columnar

Simple cuboidal epithelium is present in: 
1. Lining epithelium of thyroid follicles
2. Smaller ducts of exocrine glands
3. Covering of the ovary (germinal epithelium)
4. Choroid plexus
5. Inner surface of lens of eyeball
6. Pigmented cell layer of retina
7. Duct of Bartholin gland
8. Some part of tubules in kidney (DCT) Covering, secretion

Metronidazole is the drug of choice for invasive amoebiasis including liver abscess