স্পেশাল বিসিএস (স্বাস্থ্য)

• In lobar pneumonia, four stages of the inflammatory response have classically been described: congestion, red hepatization, gray hepatization, and resolution.

Laboratory findings in Conn's syndrome:
1.  Urinary potassium excretion increases
2.  Increased plasma aldosterone with decreased plasma renin concentration.
3.  Urinary aldosterone excretion increases.
4.  Hypokalemia.

Explanation :
Barr body :
Tightly coiled clump of chromatin
Found microacopically in interphase of cell
Presents in lining of the check ( buccal mucosa)
Absent in normal male

Ref: Davidson 23rd; P-928, box: 23.13

Explanation -
Components of acquired immunity :
B & T lymphocyte
Eosinophil
Macrophage 
NK cell
Cytokine
Complement
CD4 and CD8 T cell

Explanation :
Defect in hormone :
Achondroplasia 
Hypochondroplasia
Osteopetrosis
Thalantophoric dysplasia
Defect in extracellular structural proteins -
Osteogenesis imperfecta

Common sites for peptic ulcers are the first part of the duodenum and the lesser curve of the stomach, but they also occur on the stoma following gastric surgery, in the oesophagus and even in a Meckel’s diverticulum, which contains ectopic gastric epithelium. In general, the ulcer occurs at a junction between diferent types of epithelia, in the epithelium least resistant to acid damage.

Ganong 25th : 648-651

Explanation: The most common cause of hypocalcaemia is a low serum albumin with normal ionised calcium concentration. For details, please see Davidson 23rd, Box-18.33

Alveolar macrophages or dust cells are principal mononuclear phagocytes of the alveolar surface. It removes inhaled dust, bacteria and other particulate matter trapped in the pulmonary surfactant, thus providing a vital line of defense in the lungs.

Holter monitor (24–48-hour ECG) is the most useful initial test to capture intermittent arrhythmias causing palpitations. Echocardiogram assesses structural heart disease, thyroid function tests screen for hyperthyroidism, and chest X-ray is less relevant, but Holter monitoring directly correlates symptoms with rhythm changes.

The kidneys have a rich blood supply and receive approximately 20%–25% of cardiac output through the renal arteries, which arise from the abdominal aorta. The renal arteries undergo various subdivisions within the kidney, eventually forming interlobular arteries that run through the renal cortex. These eventually give rise to afferent glomerular arterioles that supply the glomeruli.

Explanation: Plasmodium falciparum is a Parasite

The beating of the cilia moves mucus lying on the surface of the epithelium of the conducting zone, and any contained dust, up out of the bronchial tree.

The medium-sized bronchi actually constitute the site of highest resistance along the bronchial tree. Although the small radii of the alveoli might predict that they would have the highest resistance, they do not because of their parallel arrangement. In fact, early changes in resistance in the small airways may be “silent” and go undetected because of their small overall contribution to resistance.

Basal cell carcinoma
The incidence of NMSC has increased dramatically in recent decades and basal cell carcinoma (BCC) accounts for more than 70% of cases. In Europe, the ratio of BCC to SCC is 4–5:1 in immunocompetent patients. It is a malignant tumour that rarely metastasises; it is thought to derive from immature pluripotent epidermal cells and is composed of cells with similarities to basal layer epidermis and appendages. Lesions typically occur at sites of moderate sun exposure, particularly the face, and are slow-growing. The incidence increases with age and males are more commonly affected. Lesions may ulcerate and invade locally; hence the term ‘rodent ulcer’.

 Common presentations of dissociative (conversion) disorder
 Gait disturbance  Loss of function in limbs  Aphonia
 Non-epileptic seizures  Sensory loss  Blindness

Pepsin is secreted as inactive pepsinogen. Pepsinogen is converted into pepsin by hydrochloric acid. Optimum pH for activation of pepsinogen is below 6.

Retrocecal is most common(65%) position of appendix.

Gut 50 %


ABC of Biochemistry 6th - P: 371

Reference: Davidson 23rd , Page : 1184
Explanation : Nihilistic delusion- My head is missing , I have no body or I am dead

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

Explanation :
Signs of cord compression -
Above C5 : Spastic quadriplagia
C5-T1 : LMN signs in in upper arm,UMN sign in lower leg
Thoracic cord : Spastic paraplegia 
Cauda equina : Flaccid paraplegia. 

Cellular swelling, Loss of microvilli, ER swelling, Clumping of nuclear chromatin example of reversible injury.

Reference: Davidson 23rd; P-573

Explanation: Amoebiasis is caused by Entamoeba histolytica

Explanation -
Hyperemia is an active process in which arteriolar dilation (e.g., at sites of inflammation or in skeletal muscle during exercise) leads to increased blood flow. Affected tissues turn red (erythema) because of increased delivery of oxygenated blood. 
Sympathetic activation play a role.

DIC is a complex, acquired disorder characterized by systemic activation of blood coagulation, leading to widespread fibrin formation in the microvasculature. This results in both consumptive coagulopathy (depletion of clotting factors and platelets) and secondary fibrinolysis, manifesting clinically as both thrombosis and bleeding.

Explanation :
Bacterial spores are small oval or spherical structures that are very resistant to high temperatures, radiation, desiccation, and chemical agents.
When they are formed intracellularly, they are called endospore.
The bacterial cell producing spore is called vegetative cell.

Reference: Davidson 23rd; P-429

Obstructive sleep apnea (OSA) is the most common cause of daytime sleepiness due to fragmented sleep at night; it affects about 24% of middle- aged men and 9% of women in the United States. Breathing ceases for more than 10 s during frequent episodes of obstruction of the upper airway (especially the pharynx) due to a reduction in muscle tone. The apnea causes brief arousals from sleep in order to reestablish upper airway tone. An individual with OSA typically begins to snore soon after falling asleep. The snoring gets progressively louder until it is interrupted by an episode of apnea, which is followed by a loud snort and gasp as the individual tries to breathe.
OSA is not associated with a reduction in total sleep time, but individuals with OSA experience a much greater time in stage 1 non-REM sleep (from an average of 10% of total sleep to 30-50%) and a marked reduction in slow-wave sleep (stages 3 and 4 non-REM sleep). The pathophysiology of OSA includes both a reduction in neuromuscular tone at the onset of sleep and a change in the central respiratory drive.

 Nonspecific laboratory findings associated with hyperthyroidism

Ø  Decreased serum cholesterol, LDL-C & TAG.

Ø  Increased CPK (due to myopathy)

Ø  Hepatic dysfunction, e.g. raised ALT and ALP

A cause of metabolic alkalosis is hyperaldosteronism; increased aldosterone levels cause increased H+ secretion by the distal tubule and increased reabsorption of “new” HCO3–. Diarrhea causes loss of HCO3–from the gastrointestinal (GI) tract and acetazolamide causes loss of HCO3–in the urine, both resulting in hyperchloremic metabolic acidosis with normal anion gap. Ingestion of ethylene glycol and salicylate poisoning leads to metabolic acidosis with increased anion gap.

Reference: Davidson 23rd, Box-21.78

Zinc plays a vital role in the development and function of immune cells, particularly T-lymphocytes. Severe zinc deficiency leads to thymic atrophy and impaired cell-mediated immunity, increasing susceptibility to infections.

Explanation :
IBS is characterized by chronic,relapsing,abdominal pain,bloating,and changes in bowel habits.
Peak prevalence 20-40 years
Related to menstruation of a women

Ref: Davidson 23rd; P- 959

Explanation -
Features of raised ICP :
Severe headache.
Blurred vision.
Feeling less alert than usual.
Vomiting.
Changes in your behavior.
Weakness or problems with moving or talking.
Lack of energy or sleepiness.
Seizure.

Explanation: Smoking is the most important modifiable risk factor in coronary artery disease

Explanation :
Causes of hyperurecemia :
Age : 20-30 years
Genetic predisposition  
Heavy alcohol consumption 
Obesity
Thiazide diuretics
Lead toxicity

Cholera is characterized by voluminous, watery diarrhea with a “rice-water” appearance (pale, milky fluid with flecks of mucus) due to massive fluid secretion in the gut caused by the cholera toxin.

The patient’s symptoms of morning stiffness, symmetrical small joint pain, and positive rheumatoid factor/anti-CCP antibodies are diagnostic of rheumatoid arthritis (RA), a chronic autoimmune connective tissue disorder causing synovial inflammation. RA can lead to joint destruction and systemic complications. Atlantoaxial subluxation is a serious complication due to synovial inflammation in the cervical spine, particularly at the C1-C2 vertebrae, leading to instability and potential spinal cord compression.

Artemether-lumefantrine, an artemisinin-based combination therapy (ACT), is the first-line treatment for uncomplicated P. falciparum malaria due to its rapid action and high efficacy. Chloroquine is ineffective against resistant strains, and quinine is reserved for severe cases

Explanation: Others are the features of nephrotic syndrome.

Oculomotor, Abducent & ophthalmic nerve passes through Superior orbital fissure

Reference: Davidson 23rd; P-137
সলভ ক্লাসের জন্য আলোচনা পোস্ট দেখুন - [আলোচনা পোস্টের লিঙ্ক]

Explanation: In endemic regions, a highly sensitive direct agglutination test using stained promastigotes and an equally efficient rapid immunochromatographic k39 strip test have become popular for the Diagnosis of Visceral Leishmaniasis

Reference: Guyton 14th; P- 492

Explanation -
Causes of flaccid paraplegia :
Guillain Barre Syndrome ( GBS) 
Peripheral neuropathy 
Hypokalemic or hyperkalemic periodic paralysis
Myopathy
Poliomyelitis 
Rediculopathy
Tabes dorsalis
Cauda equina syndrome 
Myesthenia gravis & Lambert -eaton syndrome 

Diuretics, particularly loop diuretics like furosemide, are the first-line treatment for acute decompensated heart failure (ADHF) to relieve fluid overload. Davidson notes that diuretics reduce pulmonary congestion and improve symptoms of breathlessness and edema. Harrison emphasizes that while ACE inhibitors and beta-blockers are important in chronic heart failure, diuretics are crucial for acute management to quickly reduce volume overload.

An unpaired median sacral artery arises posteriorly at the level of L4 to supply the coccyx, lumbar vertebrae and the sacrum.