It is essential to realise for a fact that, 1. Pleural pressure, 2. Abdominal pressure, 3. Heart chamber pressures & 4. Lung pressures, are all interconnected, interact & react among each other.
As we inspire —> the diaphragm moves down, creating a more negative intra-pleural pressure & a more positive abdominal pressure —> this adds up to ⬆️ venous return to right atrium —> excess blood enters RV & ⬆️ right ventricular end diastolic pressure (RVED)
A thread on mechanics, logistics and reasons behind positive end expiratory pressure (PEEP) significance while handling patients on mechanical or non-invasive ventilation 🧵
PEEP is the air pressure that stays “WITHIN” the lungs after a person finishes exhaling. Now, this PEEP pressure is always greater than atmospheric pressure. It essentially prevents the alveoli’s to collapse and maintains the airways open.
CPAP is a non-invasive mode of ventilation which works by the same principal of PEEP, I.e. to provide end expiratory positive pressure
EPAP means expiratory positive airway pressure which works with the same logic & dynamics of PEEP, but is used for patients receiving BPAP
Give progesterone > bleeds | It was the one lacking on board (anovulation/PCOS)
Give progesterone > doesnt bleed | try adding estrogen & simulate a menstrual cycle >> If then Bleeds🩸> something’s wrong with the FSH/LH fine tuning
If Estrogen + Progesterone does’nt lead to bleed🩸— check for uterine pathway blockage/structural defects (Asherman’s syndrome) esp. pt having h/o multiple D&C
During ventricular tachycardia, sometimes the SA nodal firing takes control of independent ventricular depolarization for brief moment, as this happens, “CAPTURE BEATS” appear. They are nothing but a brief moment of normal looking P-QRS pattern
Whats a “fusion beat” ?
During ventricular tachycardia, sometimes the SA nodal impulse and the independent ventricular impulse combine together to create a mix looking P-QRS pattern called fusion beats.