Diaphragm is a thoracoabdominal organ which is musculotendinous. It is the primary muscle of respiration. Extension: There are 2 crura of diaphragm: 3 ligaments: Quadratus lumborum muscle is related to lateral arcuate whereas psoas muscle is related to medial arcuate ligament. The foramen of Morgagni shown in the above picture…
Tag: Respiratory system
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Mediastinum : Simplified
It is the region in thoracic cavity between the pulmonary cavities (covered by mediastinal pleura and excludes the lungs). Extent: Thoracic outlet (1st rib) to Diaphragm (T12) Superior mediastinum: Upper extent Thoracic outlet Contents (superficial to deep) 1. Glands (Thymus and Lymph nodes)2. 3 Veins (Brachiocephalic Lt. and Rt. and…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
ABG Interpretation Made Easy
Normal values Step 1: pH Step 2: pCO2 Step 3: HCO3- Step 4: Determine compensation If there is metabolic acidosis or alkalosis, determine if there is appropriate respiratory compensation: No respiratory compensation: Expected pCO2 = Measured pCO2 Respiratory compensation: Expected pCO2 ≠ Measure pCO2 Step 5: Delta ratio ΔAG /…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Bronchopulmonary segments : Mnemonic
Features of Bronchopulmonary segments: Right Lung Mnemonic: A PALM Seed Makes Another Little Palm (from top to bottom) 1. Superior lobe: 2. Middle lobe: 3. Inferior lobe: Left Lung Instead of lateral and medial segment as described in middle lobe of right lung, the left lung lingula has: Some books…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Oxygen Hemoglobin Dissociation Curve : Mnemonic
The oxygen hemoglobin dissociation curve is sigmoidal in shape because the binding of 1st oxygen molecule is difficult, however once bound, they facilitate the binding of subsequent molecules until the saturation is reached (plateau). This is called the allosteric interaction (cooperativity). Lets come to the mnemonics now. The curve can…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Mnemonic based Clinical Diagnosis of Covid-19
Mnemonic: Covid-MATCH65 Covid-19 patient exposure or international travel: 2.5 points Myalgia/Malaise: 1 point Anosmia or Aguesia: 2.5 points Temperature (any reported fever): 0.5 point Coryza/sore throat: -1 point Hypoxia – oxygen saturation <97%: 1 point 65 years or older: 1 point Scoring assessment: <1 = Low risk (0.5%) 1-1.5 =…
PGMEE, MRCS, USMLE, MBBS, MD/MS 
Physiology of Pulmonary Surfactant
Origin Type II alveolar cells/pneumocytes (small but numerous) and Lamellar bodies (appear in Type II pneumocytes at around the 20th week of gestation) Type I alveolar cells (large and covers 95% alveoli) are squamous cells and involved in gas exchange process. Recycling 90% is reprocessed (through endocytosis); average time for…
Case Reports 
A Classical case of Congenital Diaphragmatic Hernia
A Single/ Term Male Baby weighing 3.0 kg was delivered via emergency LSCS for fetal distress who was prenatally diagnosed to have congenital diaphragmatic hernia in utero. He was born with Apgar score 4/10, 6/10, was immediately intubated and transferred to NICU. After stabilization, he was kept under the ventilator…