50.

51.

52.

53.

54.

55.

56.

57.

58.

Inan ECG with normal QRS axis :
(A) QRS is positive in lead I and negative in lead aVF
(B) QRS is positive in lead I and positive in lead aVF
(C) QRS is negative in lead I and positive in lead aVF
(D) QRS is negative in lead I and negative in lead aVF

Underdamping in ECG results in all except :
(^) Spikes at the corners (B) Narrowing of the complexes

(C) Increased amplitude of waves (D) Elevation of ST segment

RR interval variation in an ECG is caused by all except :
(A) Sinus arrhythmia (B) Atrial fibrillation
(C) Early repolarization (D)_ Atrioventricular block

PR interval in ECG represents :
(A) Conduction through atria (B) AV Nodal conduction
(C) Conduction through bundle of His (D) Allof the above

Which of the following is not feature of left ventricular hypertrophy?
(A) Increased QRS voltage (B) ST segment depression

(0) T wave inversion (D) Right axis deviation

Chronological order of ECG changes in acute myocardial infarction :
(^) Tall T waves, Q waves, ST segment elevation
(B) ST segment elevation, Tall T waves, Q waves
(C) Tall T waves, ST segment elevation, Q waves

(0) Q waves, Tall T waves, ST segment elevation

Artefacts in ECG can be produced by all except :
(A) Lead misplacement (B) Improper grounding

(C) Electrode movement artefact (D)_ External interference

Which of the following comes in the bandwidth recommended for diagnostic ECG in adults is?
(A) 0.05-100 Hz (B) 100-200 Hz
(C) 200-300 Hz (D) 300-500 Hz

T wave in ECG is caused by :
(^) Atrial repolarization (B) Ventricular depolarisation
(0) Atrial depolarization (D) Ventricular repolarization

9 191/2023
[P.T.0.]